CT20 Installation Instructions
Contents
1. English Course asinog IJAN a i existing 55 s exposure metric shingle E E sealan FEE ina materials removed Figure 10 23 Reroofing using standard 12 x 36 shingles over metric shingles 1 1 1 _ t POOR o Q N N A a QNG O 1 1 1 y rm L A new English dimension shingle A standard metric shingle is typically exposed 57 6 to the weather The illustration Figure 10 23 shows an idealized method used to reroof with a 12 by 36 English dimension shingle If the existing shingles have been cut back to the eaves a 5 8 starter course is suggested This enables the tabs of the first course shingles to be sealed and also helps reduce unevenness A starter course is also helpful because the headlap of the first course English shingle will likely butt against the bottom edge of the third course of the existing metric laminate This provides a 3 4 overhang at the eaves Apply succeeding courses Nos 2 8 with 5 exposures to the weather as is typical in English dimension shingle installation Notice that each course gradually drops farther away from the leading edge of the shingle above The English dimension shingle can bridge that gap But when you reach the metric shingle s ninth course the English shingle s eighth the gap sho2. THREE CLEAN DECK APPLICATION METHODS FOR METRIC SHINGLES gt a Install on new roofs and tear offs using the following methods The Seven Course 578 Stepped Off Diagonal Method Random 5 8 Method The alternate Eight Course Five Inch Stepped Off Diagonal Method or The alternate Half Tab Method SEVEN COURSE 5 STEPPED OFF DIAGONAL METHOD RANDOM 5 METHOD PREPARING THE DECK e Apply underlayment as required CertainTeed suggests that a layer of shingle underlayment be applied For UL fire rating underlayment is generally required Apply flat and unwrinkled e Snap horizontal and vertical chalk lines to assure shingles will be correctly aligned Expose all shingles 5 141 mm STARTER COURSE 1 Use CertainTeed Swiftstart or a starter course consisting of the shingles from which the lower tabs have been removed Figure 10 13 Remember the sealant on starter courses should lay as close as possible to the eaves edge of the roof 393 8 1000 mm Full Length rs Starter Shingle T Remove 1 7 these portions i at Figure 10 13 Make starter shingles by removing the lower tabs 2 Next cut half of a tab off the length of the first starter course shingle Install this shingle on the lower left corner of the roof Make sure there is 1 2 left overhanging both rakes and eaves if drip edge is being used If you are not using drip edge make the overhang
3. section i pa 1 31 off 26 off Deck 21 off 16 off 11 off 30 off 25 off 20 off 15 off 10 of 3rd 5 of Section l O off LL ist course J eee i Eaves Figure 10 9 Five Inch Stepped Off Diagonal Method STARTER COURSE 1 Use CertainTeed Swiftstart or Universal Starter or a starter course consisting of the shingles from which the lower 5 tabs have been removed Figure 10 6 Remember the sealant on starter courses should lay as close as possible to the eaves edge of the roof 2 Cut 5 off the length of the first starter strip and apply the resulting 31 piece at the lower left corner of the roof This starter strip should overhang the rakes and eaves 1 2 when drip edge is used or 3 4 when no drip edge is used Figure 10 7 3 Continue with full length starter course shingles along the eaves 1ST COURSE Begin Section I by applying a full shingle at the lower left corner of the roof tabs flush with the starter course 2ND TO 7TH COURSE 1 Begin the second course by cutting 5 off the left end of a shingle and applying the 31 piece over the first course shingle flush with the left edge of the first course shingle and exposing the first course 5 Figure 10 9 2 Each succeeding course up to and including the seventh course should start with a shingle 5 shorter off the left end than the previous course Expose each c
4. Os Continue with full length starter course shingles along the eaves Figure 10 7 1ST COURSE Apply a full shingle at the lower left corner of the roof Make tabs lie flush with the edges of the starter course In this way sealant on the starter strip will adhere to the first course tabs and help keep them from lifting in high winds Figure 10 8 CERTAINTEED SHINGLE APPLICATORS MANUAL Chapter 10 93 2ND THROUGH 6TH COURSES 1 Cut 6 off the left side of a shingle and install this 30 piece over and above the first course shingle in line with the left edge of the starter course Leave the 5 tabs of the first course shingle exposed Figure 10 8 2 Cut 12 off the first shingle of the third course 18 off the first shingle of the fourth course 24 off the first shingle on the fifth course and 30 off the first shingle of the sixth course Apply each with its left edge in line with the previous course Figure 10 8 3 Install full shingles flush against the six applied courses Figure 10 10 see A SUCCEEDING COURSES As you go up the rake repeat the same pattern used to start the first six courses Figure 10 10 see B Finish the courses with full shingles working from the eaves up the roof Figure 10 8 Applying the first 6 courses on a standard slope 94 Chapter 10 2 FIVE INCH STEPPED OFF DIAGONAL METHOD TWELVE UP FIVE OFF 2th j p mt ah section m sth Course Jum i
5. REMAINING COURSES 1 2 As you go up the rake repeat the pattern used to start courses one through six Finish the courses with full shingles working from the eaves up the roof COMBINING THE NESTING METHOD WITH THE ALTERNATE 12 COURSE FIVE INCH STEPPED OFF DIAGONAL METHOD FIVE OFF TWELVE UP 31 off 12th 26 of 11th gt 21 ol 16 ol 11 ol 8th Course 30 off 7th E T 25 of 6th Section uf L ae at 20 0 sth ss pe 150 ath r a call cole 2 n Section L i Ls J i i En A ey SS SETT A I L E L _5 Wide Starter Eaves Figure 10 21 Five Off Twelve Up Nested STARTER COURSE 1 Use 5 by 36 shingles for the starter course To make a starter shingle first cut the tabs off of a standard three tab shingle then cut off a strip 2 across the top of the same shingle 2 Cut 5 off the length of the first starter strip and align the 31 piece over the first course at the lower left corner of the existing roof 3 This starter strip should overhang the rakes and eaves 1 2 when drip edge is used or 3 4 when no drip edge is used 4 Continue with full lengths of starter strips along the eaves 100 Chapter 10 1ST COURSE The first course is made of 1
6. nesting combined with the Five Inch Stepped Off Diagonal Method or The alternate approach of nesting combined with the Six Inch Single Column Vertical Racking Method NOTE Nesting is preferred over bridging methods when reroofing because nesting sheds water best and looks better Nesting as described below is an easy application process over square tab asphalt strip shingles with a 5 exposure If you are covering a differ ent type or size shingle you may need to cut back the tabs so that nesting is possible To do this simply cut off the leading edge of all the old shingle tabs if they would be lapped less than 2 1 2 by the new shingles This permits a flat nested application that avoids lifted edges and slumps PREPARING THE ROOF SURFACE FOR REROOFING Make the surface of the old roof as smooth as possible by replacing missing shingles Split and nail flat all buckled raised tabs and curling shingles Figure 10 19 Preparing an old roof for reroofing It s a good idea to cut old shingles back flush to the rakes and eaves We suggest that you apply corrosion resistant drip edge along the rakes and eaves covering the edges of the old shingles This will provide a uniform and straight edge that will help prevent water seepage under the shingle edges SPECIAL NOTE The instructions that follow assume that the roof surface is dry and has been properly cleaned and prepared before rer
7. 2 In courses where the right hand shingle tab in the course above was purposely left unfastened carefully lift the loose shingle tab so as not to cause damage by tearing or sharply bending and slip the next shingle underneath to butt the hidden shingle edge Apply all four fasteners to the newly placed shingle and one fastener to the free end of the shingle tab above it 3 In alternate courses where the new shingles butt against the visible shingle tabs initially apply only three fasteners leaving the right hand edge free 4 Repeat this procedure to complete columns and courses across the roof gt as in INSTALLING ENGLISH OVER METRIC gt as Metric shingles are bigger by about 20 percent than standard size shingles In inches they measure 13 by 39 The main advantage of metric shingles compared to standard shingles is the possibility of covering a little more of the roof in a little less time The main disadvantage for reroofing is that the nesting method for covering the common 12 by 36 shingles uses more material because it does not take advantage of the full metric tab exposure The installation of an English dimension shingle over a metric shingle is a little more labor intensive than the typical English over English reroofing job but it s not a very difficult process Modified Bridging Method English Over Metric i 11 TA T Nail Placement L y z
8. 3 4 3 Continue with full length starter course shingles along the eaves Figure 10 13 1ST COURSE Apply a full shingle at the lower left corner of the roof Make tabs lie flush with the edges of the starter course In this way sealant on the starter strip will adhere to the first course tabs and help keep them from lifting in high winds Figure 10 14 2ND THROUGH 7TH COURSES 1 Cut 5 48 off the left side of a shingle and install this 333 4 piece over and above the first course shingle in line with the left edge of the starter course Figure 10 14 2 Cut 1114 off the first shingle of the third course 16 7 8 off the first shingle of the fourth course 22 1 2 off the first shingle on the fifth course 28 off the first shingle of the sixth course and 33 Y4 off the first shingle of the seventh course Apply each with its left edge in line with the previous course Figure 10 14 3 Install full shingles flush against the seven applied courses SUCCEEDING COURSES As you go up the rake repeat the same pattern used to start the first seven courses Finish the courses with full shingles working from the eaves up the roof IMPORTANT Do not align end joints of a given course closer than 5 from one another and they must be at least 3 from the nails on the underlaying course Figure 10 14 Applying the first 7 courses on a standard slope EIGHT COURSE FIVE INCH STEPPED OFF DIAGONAL METHOD Deck
9. If you re installing over a dimensional shingle Independence might be your best choice 102 Chapter 10 gt NX ROOF OVER METHODS FOR METRIC DIMENSION SHINGLES gt as The same methods used for clean deck application of metric dimension shingles are used for roof overs Application of metric dimension shingles over English dimension shingles is not recommended due to the high cost of workmanship and greater risk of worker error Lin HIPS AND RIDGES gt as 1 First apply the shingles up to the hip or ridge on both sides then trim flush 2 Make the caps by cutting full length shingles at the tab cutouts Trim the back end of the caps as shown in Figure 10 24 Less lt Bi oe 50 mm 25 mm i a ee ce te Cap Cap a Remove Shingle Shingle Shingle Figure 10 24 Cut tabs then trim back to make cap shingles English dimensions shown 3 Start installing the caps at the bottom of a hip or at either end of a ridge Figure 10 25 Installation of caps along the hips and ridges 4 To prevent cracking make sure the caps are warm enough to permit proper forming over the ridge or hip 5 Fasten each cap shingle with two nails installed at 5 8 5 1 2 for Norwood plant from the bottom edge and 1 in from each side 6 Leave only the 5 tab exposed to the weather Do not expose fasteners 7 You can improve the appearance of the roof by applying two layers The thick do
10. course up to and including the sixth course should start with a shingle one half of a tab 6 16 shorter cut off from the left end than the previous course Figure 10 16 Expose each course 5 8 NOTE Most CertainTeed 3 tab shingles have 3 aligning notches cut into the headlap which can be used as a guide to line up the cut outs 98 Chapter 10 69 16 1 2 tab 1 tab 1911 16 11 2 tabs Deck 21 2 tabs off 11 2 tabs off 1 tab off 1 2 tab off Figure 10 17 Half Tab Method in CHIMNEY FLASHING gt ae Metal Step Flashing 2 50 mm Minimum 3 75 mm Minimum Fold down counter flashing over step flashing Figure 10 18 Flashing around a chimney CERTAINTEED SHINGLE APPLICATORS MANUAL ca Here s aT ip Stack all the pieces of shingles that you trimmed to step the shingles up the roof Use these pieces to fill in at the rakes or valley at the other end of the course Never use pieces shorter than 4 at the rakes or 18 in the valley ina gt lt a THREE ROOF OVER METHODS FOR ENGLISH DIMENSION SHINGLES gt lt a Reroofing over existing square tab asphalt strip shingles with 5 tabs using the following methods The standard approach of nesting sometimes called butt and run combined with the Six Course Six Inch Stepped Off Diagonal Method or The alternate approach of
11. full shingles against all 12 courses SUCCEEDING COURSES Going up the rake repeat the 12 course pattern alternating Sections I and III up the roof Complete courses across the roof using full shingles working from the eaves up the roof COMBINING THE NESTING METHOD WITH THE ALTERNATE SIX INCH SINGLE COLUMN VERTICAL RACKING METHOD RACKING Figure 10 22 Vertical Racking Nested STARTER COURSE 1 Use 5 by 36 shingles for the starter course made by first cutting the tabs off of a standard three tab shingle then cutting off a strip 2 across the top of the same shingle CERTAINTEED SHINGLE APPLICATORS MANUAL in Here s aT ip Save the tabs that you cut off starter shingles for use as a vertical front wall base flashing cover Thanks for this tip go to both Darren L Burke of Montclair New Jersey and Dave Mulholland of Ohio 2 Cut 6 off one side of the first starter shingle and install the 30 piece over the first course of the old shingles at the lower left corner This and all other shingles must nest with the butt edges of the old shingles Figure 10 22 3 Remember the sealant on this starter course must lay as close as possible to the eaves edge of the roof This will help hold the first course shingles down and provide good protection against wind blow offs which could start at the roof edge 4 If you are using drip edge let the starter shingle extend out over t
12. tabs have been removed Figure 10 6 Remember the sealant on starter courses should lay as close as possible to the eaves edge of the roof _ N Cut 6 off the length of the first starter strip and apply the 30 piece at the lower left corner of the roof This starter strip should overhang the rakes and eaves 2 when drip edge is used or 7 4 when no drip edge is used Se Continue with full length starter strip shingles along the eaves gt lt a 1ST COURSE Apply a full shingle at the lower left corner of the roof tabs flush with the starter course Figure 10 12 2ND COURSE Cut 6 off the left end of a shingle and apply the 30 piece over the first course shingle flush with the left edge and exposing the first course 5 Figure 10 12 SUCCEEDING COURSES en N Qe Begin the application of the remaining courses by alternating the use of full shingles and 30 6 cut off the left end of a full shingle shingles all the way up the rake in a single column Expose each course 5 Fasten the full shingles with three fasteners leaving the right hand tab edge unfastened until later Fasten the 30 pieces of shingle using four fasteners 4 This method will establish the Six Inch Offset Vertical Racking pattern COMPLETING THE INSTALLATION i N V A Ww Full shingles are to be butted against the right side of applied shingles in each course Work up the roof from the eave
13. 0 by 36 shingle strips made by cutting 2 off the bottom of the tabs of regular shingles Align the top edge of the strips so they butt up against the tabs of the shingles in the old third course Figure 10 21 2ND THROUGH 7TH COURSES Begin the second course by cutting 5 off the left end of a shingle and aligning the top edge with the butt edge of the shingle in the old fourth course Figure 10 21 _ N Exposure of the first course only is 3 All succeeding course exposures will duplicate the exposure of the existing roof approximately 5 Qe Start each succeeding course up to and including the seventh course with a shingle 5 shorter off the left end than the first shingle of the previous course A Align the top edges with butts of old shingles al This completes Section I the first seven courses of the 12 course repeating cycle aN Install full shingles against these seven courses 8TH THROUGH 12TH COURSES 1 Begin the eighth course by cutting 11 off the left end of a shingle and applying the 25 piece over the seventh course shingle aligned with the left edge of the seventh course Figure 10 21 2 Each succeeding course up to and including the twelfth course starts with a shingle 5 shorter off the left end than the previous course 3 Align all top edges with butts of old shingles Exposure of each course will duplicate the exposure of the existing roof Install
14. 35 off see see eee m 15 off E 5 off section 1 ond s Course O off LH ji Eaves Figure 10 15 Eight Course Five Inch Stepped Off Diagonal Method 30 off 25 off 20 off STARTER COURSE 1 Use CertainTeed Swiftstart or a starter course consisting of the shingles from which the lower tabs have been removed Figure 10 13 Remember the sealant on starter courses should lay as close as possible to the eaves edge of the roof 2 Cut 3 off the length of the first starter strip and apply at the lower left corner of the roof This starter strip should overhang the rakes and eaves 1 2 when drip edge is used or 3 4 when no drip edge is used 3 Continue with full length starter course shingles along the eaves Figure 10 15 1ST COURSE Begin Section I by applying a full shingle at the lower left corner of the roof tabs flush with the starter course 2ND TO 8TH COURSE 1 Begin the second course by cutting 5 off the left end of a shingle and applying the 34 8 piece over the first course shingle flush with the left edge of the first course shingle and exposing the first course 57 8 Figure 10 15 CERTAINTEED SHINGLE APPLICATORS MANUAL Chapter 10 97 N Each succeeding course up to and including the eighth course should start with a shingle 5 shorter off the left end than the previous course Expose each course 5 8 This completes
15. CertainTeed Shingle Applicator 9 s Manual Three Tab Shingles YOUR OBJECTIVE To learn the correct procedures for installing three tab type strip shingles ENGLISH DIMENSIONS XT 30 XT 30 IR XT 25 CT 20 METRIC DIMENSIONS CT 20 XT 25 XT 30 All of these shingles are good or better quality roofing products This means that when offering a choice of good better and best products these shingles would fall in the good or better categories All CertainTeed three tab shingles are made to have a dimensional tolerance size of 16 XT30 IR the IR stands for impact resistant is specially manufactured with a reinforced fiberglass scrim to meet UL 2218 Class 4 impact resistance rating and is also algae resistant NOTE XT30 IR must be installed over a clean deck no roof overs to obtain the UL 2218 rating It is strongly recommended that impact resistant cap shingles made from XT 30 IR shingles be installed on all hips and ridges Some insurance carriers may not consider the roof system as compliant to UL 2218 Class 4 without impact resistant cap shingles 290 260 21 12 Slope Application 21 12 STANDARD Slope Application 4 12 up to 21 12 218 5 4 12 LOW lt Slope Application 49 5 2 12 20 0 12 Do Not Apply Shingles Below 2 12 Slope Figure 10 1 Slope definitions STANDARD OR STEEP SLOPES Ce
16. IMENSION SHINGLES Install on new roofs and tear offs using the following methods The standard Six Course Six Inch Stepped Off Diagonal Method The alternate Five Inch Stepped Off Diagonal Method or The alternate Six Inch Single Column Vertical Racking Method 1 SIX COURSE SIX INCH STEPPED OFF DIAGONAL METHOD SIX UP SIX OFF PREPARING THE DECK Apply underlayment as required CertainTeed suggests that a layer of shingle underlayment be applied For UL fire rating underlayment is generally required Apply flat and unwrinkled e Snap horizontal and vertical chalklines to assure shingles will be correctly aligned Expose all shingles 5 125 mm STARTER COURSE Use CertainTeed Swiftstart or Universal Starter or a starter course consisting of the shingles from which the lower 5 tabs have been removed Figure 10 6 Remember the sealant on starter courses should lie as close as possible to the eaves edge of the roof pn 36 915 mm Full Length Starter Shingle 7 180 mm T ji l IRemovel these plortions i Figure 10 6 Make starter shingles by removing the lower 5 tabs 4 N Next cut 6 off the length of the first starter course shingle Install this shingle on the lower left corner of the roof Make sure there is 1 2 left overhanging both rakes and eaves if drip edge is being used If you are not using drip edge make the overhang 3 4
17. Section T Q Install Section II as shown in Figure 10 15 using full shingles against the eighth courses in Section I This must be done before continuing with course nine These Section II shingles are to be butted up against the Section T shingles SUCCEEDING COURSES 1 Repeat the above two part procedure up the roof 2 Complete courses across the roof using full shingles HALF TAB METHOD Deck Underlayment Starter Figure 10 16 Half Tab Method STARTER COURSE 1 Use CertainTeed Swiftstart or a starter course consisting of the shingles from which the lower tabs have been removed Figure 10 13 Remember the sealant on starter courses should lay as close as possible to the eaves edge of the roof 2 Cut half a tab off the length of the first starter strip and apply at the lower left corner of the roof This starter strip should overhang the rakes and eaves 1 2 when drip edge is used or 3 4 when no drip edge is used 3 Continue with full length starter strip shingles along the eaves Figure 10 16 1ST COURSE Apply a full shingle at the lower left corner of the roof tabs flush with the starter course Figure 10 16 2ND COURSE Cut 6 16 half of a tab off the left end of a shingle and apply the remaining piece over the first course shingle flush with the left edge and exposing the first course 5 8 Figure 10 16 3RD THROUGH 6TH COURSES Each succeeding
18. f and cut offs are the same on both rakes Thanks for this tip to Dave Daley of Alexandria Virginia 8TH THROUGH 12TH COURSES Begin the eighth course by cutting 11 off the left end of a shingle and applying the 25 piece over the seventh course shingle flush with the left edge of the seventh course shingle and exposing the seventh course 5 Figure 10 9 _ N Start each succeeding course up to and including the twelfth course with a shingle 5 shorter off the left end than the previous course Expose each course 5 Se Installation of the pieces for courses eight through twelve completes Section III and establishes the final five courses of the two part twelve course pattern A Continue working away from the twelve courses just applied by installing full shingles not shown on the diagram SUCCEEDING COURSES Repeat the above two part twelve course procedure alternating the seven and five course sections up the roof Start each subsequent seven course section with a full shingle and start each five course section with a 25 shingle 11 cut off the left end _ N Complete courses across the roof using full shingles 3 SIX INCH SINGLE COLUMN VERTICAL RACKING METHOD RACKING Eaves Figure 10 12 Vertical Racking Method STARTER COURSE Use CertainTeed Swiftstart or Universal Starter or a starter course consisting of the shingles from which the lower 5
19. he edge of the rake and eaves by 1 2 If you are not using drip edge let the starter shingle extend over the rake and eaves by 3 4 5 Finish the starter course along the eaves using the prepared starter strips 1ST COURSE 1 The first course is made of 10 by 36 strips made by cutting 2 off the bottom of the tabs of regular shingles 2 Align the top edge of the 10 strips so they butt up nest against the tabs of the shingles in the old third course Figure 10 22 2ND COURSE 1 Cut 6 off the left end of a full shingle Nest the top edge of this new 12 by 30 piece of shingle up against the bottom edge of the shingles in the old fourth course Figure 10 22 2 Exposure of the first course only is 3 All succeeding course exposures will duplicate exposures of the existing roof approximately 5 3RD AND SUCCEEDING COURSES 1 Begin the application of succeeding courses by alternating the use of full shingles and 30 shingles 6 off the left end up the rake in a single column Figure 10 22 2 Fasten the full shingles with three fasteners leaving the right hand tab edge unfastened until later 3 Fasten the 30 pieces of shingle using four fasteners 4 Align all top edges with butts of old shingles COMPLETING THE INSTALLATION 1 Work up the roof from the eaves one vertical column at a time Butt full shingles against the right hand side of applied shingles in each course maintaining the 5 exposure
20. hingle and the dimensional base shingle In both cases the common problem is the presence of gaps created between the new roof surface to be installed and the existing roof surface The gaps occur as a function of the shingles being dif ferent sizes they don t line up or nest exactly as they would in an English to English or metric to metric roof over Bridging the gaps over a thick dimensional shingle is even more difficult than doing so over a smooth surface shingle because of the uneven dimensional surface SOLVING BRIDGING PROBLEMS TWO RULES TO REMEMBER 1 IN BRIDGING A GAP A STIFFER SHINGLE ON TOP IS ALWAYS BETTER THAN A SOFTER SHINGLE Shingle stiffness depends on the type of shingle For example fiber glass three tab shingles with a longer warranty duration are usually stiffer than those with a shorter duration The stiffest shingles are the heavyweight and super heavyweight premium shingles 2 CHOOSE A DESIGN THAT MASKS UNEVENNESS An uneven shingle surface will tend to visually intrude through the shingle surface above it creating small humps in the new roof So when you choose a shingle for a roof over it is best to choose one with a design that masks or disguises the uneven surface below CertainTeed s Independence Shangle with its deep shadow lines and textured look makes an excellent choice If you re installing over a smooth surface metric strip shingle Classic Horizon Shangle is an excellent choice
21. ick or thicker nails must go at least 35 4 19 mm into the deck On thinner decks nails must go at least 1 8 3 2 mm through the deck Nails must be 11 or 12 gauge roofing nails corrosion resistant with at least 8 9 5 mm heads and at least 1 25 mm long LOW AND STANDARD SLOPE ENGLISH 12 12 42 305 mm gt 1 25 mm Sealant Ehan 5 8 145 mm 51 for Norwood ae Plant 125 nell METRIC Figure 10 3 Use four nails for every full shingle STEEP SLOPE Use four nails and six spots of asphalt roofing cement for every full shingle Figure 10 4 Asphalt roofing cement meeting ASTM D4586 Type II is suggested Roofing Cement Apply 1 25 mm spots of asphalt roofing cement under each tab corner Figure 10 4 Use four nails and six spots of asphalt cement on steep slopes CAUTION Excessive use of roofing cement can cause shingles to blister HIGH WIND AREAS DO NOT USE STAPLES Storm nailing is not required by CertainTeed however the installer can use six nails to secure each shingle In addition the installer can seal each shingle with four spots of asphalt roofing cement ASTM D4586 Type II the size of a quarter equally spaced but it is not required by CertainTeed lia 25 mm 55 8 Exposure 1 25 pal Figure 10 5 Six nails can be used for high wind applications Lin THREE CLEAN DECK APPLICATION METHODS FOR ENGLISH D
22. iod hand sealing may be necessary CAUTION To prevent cracking shingles must be sufficiently warm to allow proper forming for hips ridges and valleys WARRANTY These shingles are warranted against manufacturing defects and are covered by SureStart protection See the warranty itself for specific details and limitations NOTE Some roofers choose to apply shingles at 4 exposure vs standard 5 at slopes less than 4 12 in order to increase the wind driven rain resistance In some cases this can be an acceptable practice but there are risks for which CertainTeed will not take responsibility A shortened exposure can harm the appearance of the applied roofing especially those with shadow lines and it can reduce shingle ability to resist wind blow offs by shifting the adhesive seal line away from the bottom edge of the shingles For technical questions information on acceptable alternative application methods and materials or a copy of the product warranty contact the sources listed below Your supplier or roofing applicator CertainTeed Home Institute 800 782 8777 Certainleed RPG Technical Services 800 345 1145 2 0 2SLise eo 2 2 Ss op o 5o H a Os azilesa Vv Vv v in FASTENING gt lt a Shingle os AP lm OS Proper Crooked Under Over Nailing Driven Driven Figure 10 2 Proper and improper nailing IMPORTANT For decks 3 4 19 mm th
23. om of the tabs of regular shingles Figure 10 20 2 Align the top edge of the strips so they butt up nest against the tabs of the shingles in the old third course Make the left edge align with the starter course CERTAINTEED SHINGLE APPLICATORS MANUAL Chapter 10 99 2ND COURSE m N Cut 6 off the left end of a full shingle Butt the top edge of this 12 by 30 piece of shingle up against the bottom edge of the shingle in the old fourth course Make the left edge align with the first course left edge Figure 10 20 Exposure of the first course only is 3 All succeeding course exposures will duplicate exposures of the existing roof approximately 5 3RD AND SUCCEEDING COURSES _ N Qe e For the third course cut 12 off the left side of a full shingle a whole tab Apply this 24 piece of shingle over the second course leaving the 5 tabs of the second course exposed The top edge of the new shingle in this course should butt up against the bottom of the fifth course of old shingles Figure 10 20 Cut an additional 6 off the first shingle of each higher course until you have to start with a full shingle again on the seventh course In other words cut 18 off the first shingle of course four 24 off the first shingle in course five 30 off the first shingle in course six On course seven start over with a full 36 shingle Install full shingles against the six applied courses
24. oofing NESTING METHOD COMBINED WITH THE SIX COURSE SIX INCH DIAGONAL METHOD SIX OFF SIX UP Cut old shingles back flush to rakes and eaves Apply drip edge along rakes and eaves if recommended The Six Course Six Inch Stepped Off Diagonal Nesting method of application described below is suggested for roofing over square tab asphalt roofing shingles of 5 1 8 125 mm 3 2 mm exposure Figure 10 20 Six Off Six Up Nested STARTER COURSE 1 Use 5 by 36 shingles for the starter course To make a starter shingle first cut the tabs off of a standard three tab shingle then cut off a strip 2 across the top of the same shingle N Cut 6 off either side of the first starter shingle and install it over the first course of the old shingles at the lower left corner Figure 10 20 Remember the sealant on this starter course must lie as close as possible to the eaves edge of the roof This will help hold the first course shingles down and provide good protection against wind blow offs which could start at the roof edge Qe A If you are using drip edge let the starter shingle extend out over the edge of the rake and eaves by 1 2 If you are not using drip edge let the starter shingle extend over the rake and eaves by 3 4 5 Finish the course using similarly prepared starter strips 1ST COURSE 1 The first course is made of 10 by 36 shingle strips made by cutting 2 off the bott
25. ourse 5 This completes Section I and establishes the first seven courses of the 12 course repeating cycle 3 Install Section II as shown in Figure 10 9 using full shingles against the seven courses in Section I This must be done before continuing with courses eight through 12 Section III These Section II shingles are to be butted up against the Section I shingles that started courses one through seven Fasten all shingles in the normal fashion CERTAINTEED SHINGLE APPLICATORS MANUAL in Here s aT ip Always try to use full shingles for the last shingles going into a closed valley This will help avoid the problem of nailing too close to the centerline Thanks for this tip go to Dave Mulholland of Ohio Figure 10 10 Six Up Six Off installation schematic m Provide adequate ventilation under Dos the roof deck to bN prevent harmful condensation in winter and heat build up in summer Line valley by centering 36 915 mm wide CertainTeed WinterGuard Waterproofing Shingle Underlayment or equivalent directly to deck a Figure 10 11 Highlight of closed cut valley details CERTAINTEED SHINGLE APPLICATORS MANUAL Chapter 10 95 Lin Here s aT ip Start racking installations in the middle of a roof plane Snap vertical lines 6 apart for three tab shingles This minimizes keyways getting out of alignment in the middle of the roo
26. rtainTeed recommends DiamondDeck Synthetic Underlayment Roofers Select High Performance Underlayment or shingle underlayment meeting ASTM D226 D4869 or D6757 Take care to ensure sufficient deck ventilation when DiamondDeck or other synthetic underlayment is installed 92 LOW SLOPES One layer of CertainTeed s WinterGuard Waterproofing Shingle Underlayment or equivalent meeting ASTM D1970 or two layers of 36 wide felt shingle underlayment Roofers Select or underlayment product meeting ASTM D226 D4869 or D6757 lapped 19 must be applied over the entire roof ensure sufficient deck ventilation When DiamondDeck or other synthetic underlayment is installed weather lap at least 20 and ensure sufficient deck ventilation THE ROOF DECK MUST BE AT LEAST 3 6 9 5 mm thick plywood or 7 6 11 mm thick non veneer or nominal 1 25 mm thick wood deck COLD WEATHER CLIMATES ALL SLOPES Application of WinterGuard or its equivalent is strongly recommended whenever there is a possibility of ice build up Follow manufacturer s application instructions FLASHING Corrosion resistant flashing must be used to help prevent leaks where a roof meets a wall another roof a chimney or other objects that penetrate a roof SEALING Shingle sealing may be delayed if shingles are applied in cool weather and may be further delayed by airborne dust accumulation If any shingles have not sealed after a reasonable time per
27. s one vertical column at a time maintaining the 5 exposure In the courses where the right hand shingle tab in the course above was purposely left unfastened carefully lift the loose shingle tab so as not to cause damage by tearing or sharply bending especially at the top of the cutout tab keyway and slip the next shingle underneath to butt the hidden shingle edge Apply all four fasteners to the newly placed shingle and one fastener to the free end of the shingle tab above it In alternate courses where new shingles butt against the visible shingle tabs initially apply only three fasteners leaving the right edge free Repeat this procedure applying one vertical column at a time to complete courses across the roof CAUTION j N in This single column method is approved for applying some types of CertainTeed shingles However double column vertical racking in which two shingles are laid side by side up the roof is NOT recommended because it can result in unattractive patterns It is very important to fasten the ends of shingles properly Nailing high or leaving nails out can result in an unattractive rack line pattern Heres a T ip Use all the shingles from one bundle before using shingles from another bundle This will result in the most pleasing color blends on the finished roof 96 gt za Chapter 10 CERTAINTEED SHINGLE APPLICATORS MANUAL in
28. uble cap creates a richer looking roof However be sure double caps have been estimated into the job price before you install them 8 To add more definition and visual appeal to the rooflines use CertainTeed s ShadowRidge or one of CertainTeed s enhanced profile hip and ridge caps CERTAINTEED SHINGLE APPLICATORS MANUAL
29. uld not be bridged because the correct nail placement would be below the leading edge of the metric shingle underneath Nailing in this area would draw down and warp the shingle on top causing a hump To eliminate the problem you must cut and remove at the metric shingle s eighth course approximately 2 of the leading edge of the next metric shingle up the roof so that the English dimension shingle nests smoothly Do the same for the metric shingle s ninth course the 10th course may naturally meet the butt edge of the shingle above Figure 10 23 CERTAINTEED SHINGLE APPLICATORS MANUAL Chapter 10 101 Repeat this method on every eighth and ninth metric course up the roof Counting from the first metric course this means the 17th and 18th courses would also be cut back as would the 25th and 26th and so on NOTE On an actual roof the course exposures will vary so the directions above may need to be modified An important rule of thumb is this Each time the top edge of the English shingle overlaps the bottom edge of a metric shingle course by less than 11 2 as shown by shingles A and B in Figure 10 23 cut that metric shingle back by 2 or to fit to allow the top edge of the English shingle to nest smoothly below it Lin TIPS FOR ROOFING OVER SMOOTH OR DIMENSIONAL BASE METRIC SHINGLES gt lt a In an English over metric roof over there are two different cases to consider the smooth surface base s
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