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HomeMy WebLinkAboutDETAIL MANUALI ■■ RECEIVED JAN 2 9 2018 0 kyi;lo County, Permitting SUPPLY & ArP Figure 3 The Gulf rib panel 1-* 9 highest known quality in the industry. n Figure 1 The Horseshoe Beach Gulf Coast Supply office (left) and manufacturing facility. conditions. Both panels and trim are fabricat using state-of-the-art computerized equipme found at our facilities in three locations in Fl to assure uniformity and consistency in prod manufacture. Panels are roll -formed to. the le specified by customers in either Galvalume any of more than twenty colors of painted 2S gauge, 26-gauge, and 24-gauge high -tensile ready for either customer pickup or on -site d ery (customers should call about availability 24-gauge metal). Your Gulf Coast representEI is waiting to assist you in making the best cY for your particular roofing needs. Gulf Coast's Gulf Rib® panels are fabril from AZ-50 (painted) or AZ-55 (bare Galvalume) grade 80 coil stock (grade 50 bare Galvalume finish is not only durable and cost effective, but offers reflectivity so valuable here in the South. The paint system employed on painted .ucts offers optimum exterior protection plus superior resistance to corrosion and ultraviolet radiation. While bare Galvalume carries a 25-year limited coil manufacturer's finish warranty, most painted metal carries a 40-year war- ranty. Both painted and unpainted are of the /`X GUIX06.1W..t SUPPLY & MANUFACTURING The Gulf Coast Gulf Rib® Roofing Panel Gulf Coast Gulf rib®.panels are a strong, durable, economic, and attractive answer to the growing demand for metal roofing needs in Florida and southern Georgia. Extremely ' versatile, they are suitable for homes and businesses as well as agricultural and utility buildings Gulf Rib® panels provide a 36- inch coverage with 3/4 inch ribs on nine -inch centers, and utilize an anti -siphoning channel to provide protection from severe weather of tive 24 Figure 2 The 4 locations of Gulf Coast Supply. Gulf Coast also stocks a complete line of fasteners, sealants, and other accessories to meet every need of both the do-it-yourself homeowner and the roofing contractor. A complete line of both in -stock and custom-made flashings and trims are available in all colors as well. DETAIL MANUALGuIfCoast SUPPLY & MANUFACTURING Installation of Panels Roof Pitch Gulf Coast roofing panels require a certain degree of pitch to ensure proper water drainage. Florida Building Code allows is minimum pitch of 2/12 for Gulf Rib® panels as long as lap screws and sealant are applied to the laps to prevent water from siphoning over the ribs (see Fig. S on p. 4). Lap screws and sealant are optional when the pitch is 4/12 or greater (4/12 pitch means that there is 4 inches of rise for every 12 inches running horizontally). As a general principle, the less steep the roof, and the more necessary also that sealant be used at all side laps. Consult our representative for recommendations for your particular roof pitch, and about roofing options if you have less than a 2/12 pitch. Roof Preparation Oil -canning is a wave-lilc`e, rippled appearance extending up the length of the panel after it has been installed on the roof. Any irregularities in the roof, including uneven plywood joints, warped plywood, uneven trusses, poor application of underlayment, the use of button caps with felt paper, etc., can promote oil -canning. Care should be taken to provide a flat, uniform surface on which to attach the panels. See page 6 for more (details. IRoof Application Panel installation should begin at the gable end of the roof opposite the prevailing rain -bearing wind (this will provide added assurance against wind -driven rain being forced under the laps). Measure one panel width in from the roof edge.. At this point chalk a line from ridge to eave. Place the leading edge of the first panel along this line. It is extremely important that this panel be laid square to the eave and ridge so that the remaining panels will line up square on the roof frame. It is wise to have a person at the eave and at the ridge to ensure that the proper panel coverage is being maintained across the roof. Also be sure that the panels are properly side -lapped (see fig. 7 on page 7). In applications where end-! lapping is necessary, the upper panel on the slope should lap over the panel that is lower on the slope by about 12 inches. Lesser- roof pitches require a greater amount of panel overlap. All end -lap applications should use two horizontal rows of butyl sealant tape across the panel and proper fastening to provide a maximum water seal. An overhang of 2 to 3 inches on the eave is recommended to provide a drip edge, while only 1 inch overhang is necessary where gutters are used. The open panel ribs at the .eave can be sealed with inside closures. For maximum weather -tightness, a row of butyl tape can be applied above and beneath closure material. i Trimming and Cutting Steel Panels The best device for cutting steel panels across the profile is either hand snips or a nibbler. Nibblers, and especially Carborundum blades on electric saws, however, do have a tendency to either leave hot metal particles that can burn paint surfaces or to leave rust marks on panels and trim. The same is true of any filings left on the roof caused by the application of screws. Care should be taken to brush all such particles from roof surfaces after application. To cut panels lengthwise: Note carefully where the panel is to be cut, and, using a straightedge, score deeply down the length of the panel with a sharp -pointed utility knife. Folding the panel along the score mark, and bending back agaimif necessary, should produce a clean break in the panel. CAUTION! clean all metal shavings and particles off of roof to avoid unsightly rust stains Roll Lite Door Tray Fl ashing (p.10) Figure 4 Roofing trims and flashings are named by t the location or function of that particular piece on the building. g) rand 1dD Udall Lap Screw Apply sealant to lap overlap► - purlin-bearing leg decking Figure 5 Butyl tape or caulk is required when the roof pitch is 3/12 or less, with lap screws applied every 2 feet to maintain water -tightness of the lap. On pitches greater than 3/12, lap screws and butyl tape are optional. For more details on screws, see pgs. 6 and 7. J �. Ad J I � GULF RIB' DETAIL MANUAL GuIfCoast SUPPLY & MANUFACTURING Ordering Roof Panels and Screws Care should be taken t'o order panels of the correct length. to avoid having to make corrective measures after purchase. Panel lengths should fall 2 to 3 inches short of the ridge when a vented ridge is desired, and should extend 2 to 3 inches past the eave to allow a sufficient drip edge (except as noted on pg. 3 concerning gutters). When a roof transition is involved, panels of the upper portion should be ordered short to allow placement of the transition flashing (see diagram on p. 10). The Gulf Coast sales personnel are ready to assist customers with information specific to their particular roof. Specially-washered screws applied through the flat of the metal is the most recommended method used to attach roofing, panels. 1-inch screws can be used if penetration of only 3/4 inch is either necessary or desired; otherwise, 1 %z inch screws are usually recommended. 2% inch screws are also available, and are often used by those who adhere to through -the -rib fastening, and for ridge -cap application. See pages 6 and 7 for more information on screw spacing and ordering. Ordering and Applying Trim The most common flashing for metal roofing is the ridge cap, which is used at the peak of a roof where two opposing roof slopes join. Other flashings include transition flashing, end wall and sidewall flashings, and valleys (see diagram on right for application). Eave trims include gable flashing and eave drip, either of which are often applied above fascia trim. When roof pitch exceeds 5/12 (a 5 inch rise in 12 inches), the slope of the roof should be mentioned when ordering ridge caps, endwalls, and eave drip. When a steeper roof slope meets a lesser slope, both slopes should be mentioned when ordering transition flashing. At the gable edge the use of gable trim adds to the appearance of the structure and protects the fly -rafter, and sidewall flashing is used where the side of a panel butts up against an adjacent wall. In either case, the installer should be careful to seal between the gable rake or sidewall and panel with butyl sealant tape, and to fasten the rake every 6" to 12" up the slope of the roof with the appropriate screws. If eave drip is used on the gable, the number of 90 degree eave drip should be specified separately from that used on the drip edge when ordering. To prevent penetration of water, insects, and debris at the ridge, outside closures should be inserted between the ridge cap and the top end of the panel. Screws are applied through the ridge cap, closure, and rib in at least every other rib of the panels. At least a 1'/z" (or preferably 2%") screw should be used for attaching ridge caps. Self -drilling lap screws can also be used to attach ridge caps. i Keep Materials Dry! Paint and finishes of Gulf 'Coast panels and trim are designed to withstand severe rain and wet weather conditions. Neither paint, galvanized, or Galvalume finishes, however, are designed to be in continuous contact with water for long periods of time. Damage will result if uninstalled panels or trim are allowed to remain wet in storage. Be sure to store material that will not be installed immediately in a dry location. Wet material should be air-dried and re -stacked if installation is not planned right away. How to Figure and.Apply Screws Gulf Coast Supply carries screws in 3 different leng inch, and 2 '/z inch. 1-inch screws will barely penet 1'/z inch are the best all-purpose size. 1'/2- or 2Y2-in necessary for attaching ridge caps. The table on t used to figure approximate quantities of screws for, spacings and sizes of roofs. For 2-foot spacing betv screws, multiply the total linear feet of metal times Example: your order is 1250 feet of Gulf R 1250 x 2.7 = 3375 screws Please confirm all estimates with your Gulf Coast rf you placed your order. Codes allow re -roofing over shingles without t provided the roof has been checked by a licensed ro Gulf Rib metal roofing can be separated from tl pine battens spaced on maximum 24"centers, or acc direct contact between pressure treated lumber a potential corrosion, Gulf Coast Supply sells only u CAUTION: Battens must be fastened to the roc minimum 8d common or pneumatic nails spaced 8" calculations according to ASCE 7-98). Battens mu of ridge, cave, hip, valley, and gable -end trims. For solid decking, at least 15L32-inch structural p center is required. If care is taken, metal roofing application can bi quickly and accurately into the desired spacing. Pre. accurately in the proper locations on panels. Purlin For panel lap details, see Figure 5 on page 4. Gulf Coa Delivery policy Delivery charges apply to all orders whey department for details. Sales tax All orders picked up at Gulf Coast Supply, any state sales tax. Tax exemptions should be verified pri Warrantied products A 40, year warranty applies to mo warranty to Galvalume material. Ask for details. Indemnity All prices and designs are subject to change Disclaimer While we have made every attempt at aceur printing, or technical errors. Oil Canning —a repeating, wave -like appearance in the le phenomenon in metal panels like Gulf Rib roofing this defect, nor a cause for rejection. See p. 3 for details i, Return policy All panel orders and special order (non-s' refundable once they are manufactured. Standard trip clean, resalable condition. For details; go to www.gu. bottom of page, or call Gulf Coast Supply to ask spec GuIfC®ast SUPPLY & MANUFACTURING Screw (urlin) Spacing 12 inch 18 inch 24 inch 0 50 270 180 135 is: 1 inch, 1'/z 100 540 360 270 ate a IA but the o 200 1080 720 540 h screws are 300 1620 1080 810 e right can be 400 2160 1440 1080 500 2700 1800 1350 trious purlin a 600. 3246 2160 1626 ;en rows of o 700 3780 2520 1890 7 800 4320 2880 2160 b roofing. 900 4860 3240 2430 23 1000' 5400 3600 2700 - 1100 5940 3960 2976 rresentative when 1200 6480 4320 3240 use of battens calculation chart ing contractor to insure levelness and pullout integrity. moisture barrier by minimum, nominal 1 "x3" yellow ding to ASCE calculations where applicable. Since d metal roofing must be avoided in order to prevent reated battens. deck with minimum #6 screws at 12" on -center, or two s-center, or one every 4" on -center (or by applicable be installed to support the entire width and length supported on rafters at a maximum of 24" on aided by pre -drilling panels, allowing screws to go drilling will work provided that pilot holes are placed spacing must be uniform and carefully measured. Policies delivery is requested. Please consult your Gulf Coast sales all orders delivered within the state of Florida, are subject to r to delivery or customer pickup. t material* manufactured from painted coil stock, and a 25-year ►out notice in this manual, we are not responsible for typographic, gth of the panel —is a common and often unavoidable have large, flat areas within the panel. It is therefore not a how to avoid oil -canning.. ick) trims are considered the property of the customer and non - and accessories are refundable providing they are returned in a coastsupply.com and click on "No Hassle Return Policy" at is questions about returns. Gulf 0604 SUPPLY & MANUFACTURING Gulf Cast Gulf Rib° Roofing. Panels Fastening Schedule for Various Wind Speeds — minimum 2:12 roof pitch Wind Speed Zone - 130 MPH 140 MPH 150 MPH 160 MPH Roof Fastener Fastener Size Attaching to: On Center On Center On Center On Center Zone Type Spacing Spacing Spacing Spacing Zone 1 WoodgrpO #9-15 x 1'/Z min.15/32 24" 24" 24" 24" woodzac® plywood Type 9 Type 1 Type 1 Type 1 Zone 2 dgrip® w000 - #915 x 1? z min. 15/32 24" 24" 24" " 24 woodZacs plywood Type 1 Type 1 Type 1 Type 2 Zone 3 woodgrip® #9-15 x 1'/Z min.15132 24" 24" 24" 24" woodzac® plywood Type 2 Type 2 Type 2 Type 2 Fastener pattern Fastener pattern Type 1 Fastener patterns Type 1 and Type 2 are shown at left, row spacings are Type 2 shown in the table above, and roof zones are displayed on left below. Figure 7 shows a simple illustration of Zone 2 a the patterns. Note that fastener pattern Eave Type 2 is required at top, bottom, and a end laps of each panel, as well as in additional areas according to which roof zone the fasteners fall in. Each "zone" of the roof has its own ......................... ............................. . ............. requirements.Dimension a is screw a defined as 10% of the minimum width --Ridge--------------- � of the building, or40%of the mean ...............................:... height of the roof, whichever is Gable smaller; however, a cannot be less Zone 1 than either 4% of -the minimum width of the building, or 3 feet. .........: ............................................................. Figure 7 Screws should be placed on both sides of the ribs at both eave and ridge, and on the overlap side of any panel laps. GuIfCo6st SUPPLY & MANUFACTURING Eave Drip & Fascia 0000 FHA Style ED-3 Style 2 3j8" 1 Eave drip Eave drip N.,7/16(� I� r N—b--►I 1 For custom eave drip, specify the I Eave drip with fascia and inside closure Eave drip a amount of the eave that will be Figure 8 Eave drip and fascia give a finished look along the drip covered (dimension "a"), and, for eave of the house, as well as providing protection) for the steeper roofs, specify pitch. If materials they cover. The eave drip should completely cover the Fascia a fascia is desired, be sure that the top edge of the fascia. Inside closures, which seal off the open dimension you order will be ribs of the panels, are optional. ► b �. hidden by the eave drip. Summary of Stock Trims and Flashings itam cnorinll nrdar inMrmntinn Ridge caps (RC-2) I specify pitch if less than 3/12 or greater than 6/12. Also available in larger widths. Closures recommended. Eave drip (FHA, ED-3) 2 common styles. F"A style is pre -pitched for 3/12 to 6/12 roofs. For appearance or ease of application, order by either specific pitch or as gable trim (901). Gable flashings Residential (EF-1), large (GR-2), and small (GR-1) rakes available. Use butyl sealant between rake and panel. Valleys (PV 1) specify pitch if grea er than 7/12. Seal with universal foam closure material. ®pen-hen�med valleys (PV 2) aid water -tightness. Sidewall (SW-1) Use butyl sealant between sidewall flashing and panel. Endwall (EW-1) Specify pitch if greater than 5/12. Seal with outside closures. Transition flashing Specify pitches of both roofs. Seal lower slope using outside closures and, if desired, inside closures on upper slope. I I Gulfco6ft SUPPLY & MANUFACTURING The Ridge Cap is used to seal the point at which two upward slopes meet. This can be both along the ridge of the roof as well as a covering for a hip. Either woodgrip or self -drilling lap TEK screws are applied through the ribs of the metal. Since debris, insects, and blowing rain can find easy access under the ridge cap, closures are required Ito either completely or partially seal the opening. Closures under ridge caps come in 3 types: solid, vented, and hip tape. t-figure 9 Solid closures ("Outside Closures") are (right). the same width as the panels. They lock together in a row placed directly under the screws that attachl, the ridge cap, and forth a solid, water -tight, air -tight barrier. Profile Vent® comes in 50 foots rolls, is 3 inches wide, and forms a water - retardant, insect resistant barrier that allows hot air to escape from the attic, and is superior to many more elaborate and expensive vent systems. Any length maybe ordered. Hip closure tape (Peel and Sealj) is a sticky, adhesive -backed metallic tape that seals the hip roof. It is '6 inches wide and comes in 33'/2 foot rolls. Because it must be conformed to the rise and fall of the panel ridges, approximately 10% extra may be needed beyond the length of the hip being covered. I. Outside „/" Profile Vent® closure 6 or Versa-Vent9' An . `Lap or 2'/z' Woodgrip' ► screw required RC-2 Standard 12-inchl,Ridge Caps are strong, economical and adequate for most of your roofing needs . ro RC-1 style 12-inch Ridge Caps are also available in custom widths Ridge cap showing outside closure (left) and protile vent Figure 10 Pipe Boots provide a water -tight seal around roof vents and come in a variety of sizes. They seal with caulk and conform to the shape of the panel ribs. a RC-2 style over -sized ridge caps are available with 18-inch coverage, or as a custom trim item in total widths (2 times "a") of 14-, 16-, 18-, 20-, 22-, and 24-inch Figure 11 As with the ridge cap, the ENDWALL FLASHING above is sealed using outside closures. Use EW-2 hemmed endwall when cornering endwalls with side v'all flashing, such as with dormers or chimneys. 7 For custom end -walls, specify roof pitch and dimensions "a" and "b" Transition Flashing Ooo. The TRANSITION FLASHING prevents leakage at the point where two different roof pitches meet. It must be sealed on the lower side with outside closures, and can be sealed underneath the upper panels with inside closures. The similar GAMBREL FLASHING is used where the lower pitch is steeper than the upper. TF-1 Transition Flashing closure _. , „ For custom transition flashing specify the pitches of the two roof slopes and, if necessary, dimensions "a" and "b". /`W Gulf'coast SUPPLY & MANUFACTURING ® End -wall Flashing End -wall flashing is applied where the upward slope of a roof meets a wall. The wall side of the flashing can be covered with siding or counter -flashing, and outside closures are necessary to seal recommendedd)) caulk (Solar between t h e L3�2/ aulk edge (order EW-1C) flashing and the 3(used if endwall not panel. Roof slope 11 covered by siding) s h o u l d b e mentioned if roof exceeds 5/12 pitch. LEW-1 Stepped b Endwall a Figure 12 The transition flashing (above) and the GF-1 gambrel flashing (right) provide -a continuous drainage where two slopes meet. Both seal with otl tside closures on the lower side. T EW-2 Hemmed b Endwall 1 _a � a = 4/zn b = 311 Gable Flashing 10, 3 ►, Butyl tape 3/4" I I l EF-1 style 7/16' Custom trim —specify a cus i m R length for a or b. Standard dimensions — al 3" b�3" GR-1 style Custom trim —specify a custom length for a orb. b Standard dimension!.— a = 2 N't b =21/8" ,j mew ofstandard sidewafftrim Figure 14 Sidewall flashing is applied when the side of the roof butts up against an adjacent wall. The wall -side of the flashing can either be covered over with siding or sealed with caulk (order SW-1C). Butyl tape should be applied where the "foot" of the flashing attaches to the roof. 21 �X Gulfco6ft SUPPLY & MANUFACTURING l� = View o - ga a rna ascta oar remove Figure 13 Gable flashing is used to trim the edge of the roofing panel at the gable end of the roof. It should match the eave drip that extends along the drip edge of the roof. If the panel is allowed to hang over the gable end, eave drip can be used instead. Butyl tape between the trim and panel eliminates leaks. /Side -wall Flashing caulk (Solar SeaF recommended) caulk edge (order SW -IC) (used if sidewall not covered by siding) 3" �r311 —� Butyl tape ' 3/4" 5'1I SW-1 Custom trimspecify a custom length for a or b. Standard dimensions — a = 3" b=3" G C SUPPLY & MANUFACTURING Preformed Valley s Install panels 2 to 4" from diverter panel 2, rr (111� PV-1 style I- a—� J PV 2 style Two basic styles of valley are available. For custom valleys, specify dimension "a" Figure 15 Pre -formed valleys use a diverterto preventwater from rushing under panels on the opposite side, while meanwhile channeling water off the roof. Expanding foam closures are often used to assure a good seal. Gulf Coast Gulf Rib® Siding Drip Cap J-Channel (p.14), Figure 16 Common trims Sliding Door e Drip (p.14) :ed with Gulf Rib roofing panels 13 i Wf` s GULF RIBTM DETAIL MANUAL i GR-2 Outside Corner loo. The GR-2 Rake and Comer, can be used as a gable trim or a corner for metal -sided buildings. As an alternative, the smaller EF- I or the GR-1 (both on p. 11) can also used as gable rakes, and the PC-5 (below)or the GR-1 as corners. Customizing rakes or corners is often necessary due to their landing on a panel rib. Both the GR-2 and the IS-2 can be ordered as custom trim items by specifying custom dimensions "a" or "b". Be sure to take into account the 3/a" "head space" when figuring custom dimensions. 1 3 1 The PC-5 flat corner ;works best on smaller istructures, and where ,the panels are running horizontally. It can be sealed with outside closures. Figure 17 When used as corner trim, the GR-2 straddles the ribs of the panels where they meet at the corner of the building. The Gulf Rib outside corner also serves as a gable rake (see below). The inside corner (IS-2) has similar dimensions but with a reverse middle bend. Figure 18 When used as a gable rake, the GR-2 runs parallel to the ribs of the roof panel, and ,is attached with screws running through the ribs of upright siding. As with the EF-1 residential rake, the roof side can be sealed with butyl sealant. -4 GR-2 bL a } I� drip .. 3 s Figure 19 The drip cap is commonly used to trim out the bottoms of panels over doorways and windows, and occasionally takes the place of base drip. J-channel is used to cap raw panel edges where run-off is not a problem, and is most commonly used to trim around the bottom, sides, and occasionally the top of windows and doors, and also to cap the top sides of skirting. Base Drip Poo- GuIfC®ast SUPPLY & MANUFACTURING ® Drip Cap and J-Channel DC-1 Drip cap ® T j v CD 2I'/z" . li 518" d I capping the panel end ® JC-1 J-channel panel 7//88" ^^ capping the panel edge ti Figure 20 Base drip seals off the bottoms of panels at the floor level, where it helps to prevent the entrahce of rodents and insects, as well as a base for the setting of panels. I Gutters ► Gulf Coast Supply produces 29-1 26-, and 24- gauge gutters in either 5- or 6-inch widths (depth is approximately equal to width); All gutters should be ordered specific to the pitch of the roof. Downspouts are available in 3"x4" (for 5- inch gutters) and 4"x4" (for larger gutters). End caps should be ordered at the same time as the gutters to assure a custom fit. Special hangers fit into the panel rib and under the gutter lip. Panels should extend no more than I" I. to 1'/z" inches beyond the eave on which gutters are planned. I" lap �-5 or 6"� GuIX&M C It OOI V s, nn A nl It F A rT[IV 1 hIr. Figure 21 Exposed view of gutter showing gutter placement, downspouts, and end caps. Hangers em screws, and end caps are best attached with rivets. _LOut( Inner and outer gutter sections (marked "I" and "O") alternate along the eave to assure ease of application and gutter appearance. in excess of 10 feet in length must sections. Figure 22 Sliding door track covers fit over the door track and under the panels to hide the track, assure a neat appearance, and shed water over the door. MKI Gulfco6ft SUPPLY & MANUFACTURING \\J Ridge caps (pg. 9) Eave drip (pg. 8) Valleys (pg. 12) Gable rakes (pg. 11) Wall flashm (pgs. 10 1 Transition & gambrel flashings (pg. 10) Comer trims (pg. 13) Door & window trims (pg. 14) Base drip (pg. 14), Pipe Boot (pg. 11) Electrical Boot Reflective bubble insulation Inside Closures ik a a w — ® . �1 Outside Closures Flex-o-vent Profile Vent! Expanding Foam Peel and Seal Touch-up Paint Lap La TEK Butyl Tape Titebond® Woodgripa' Screws TEK screws WoodZac V screws WoodMaco screws Guide to Accessories item a&fication pipe boot electrical boot Fits over vent and heat pipes. Available also in heat -resistant boots. i Fits around pipes witinaccessible tops (such as weatherheads). outside closures inside Required to seal under ridge caps and transition and endwall flashings. Seals on'the eave. -closures under panels,'-paIrticularly Proffle Vent® Flex-o-Vene Vented closure material surpassing many other venting systems. expanding foam Compressed adhesive foam expands to seal between valleys and panels. p Peel and Seal® - Seals hips under hip caps. I-- , - Also, a general purpose sealing tape (6" wide). touch-up paint Hides scratches and mars -!, encountered in installation. Over 20 colors. butyl tape General purpose low-Fost sealant, used on panel laps and under trim. Titebonde Asup-eri-or general purpose caulk for all joints. Matches panel colors. Low profile insulation Greatly reduces radiant heat when installed under panels. Woodgripo screws Used in all applications attaching metal to wood. III, 1Y2", V/2" sizes. TEK screws Self -drilling TEK screws for metal purlins. Lap TEK screws draw together joints and-atfach trim. ZAC® screws "Lifetime" screws; M"2Y21', threaded for wood; self drilling available.