Sarnafil S327 Mechanically-Attached Engineered System Introduction



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Hot-air weld overlaps according to Sarnafil’s recommendations. Seam test cuts shall be taken at least 3 times per day.





      1. Securement Around Rooftop Penetrations



        1. At the base of walls, drains, curbs, vent pipes, or any other roof penetrations, Sarnafasteners, Sarnabars and/or Sarnadiscs shall be installed according to perimeter rate of attachment. Fasteners shall be installed according to the manufacturer’s instructions. Fasteners shall be installed using the fastener manufacturer’s recommended torque-sensitive fastening tools with depth locators. Fasteners shall clamp the Sarnafil membrane tightly to the substrate.




        1. Sarnafil membrane flashings shall extend 2-1/2 inches (63 mm) past the Sarnabars and/or Sarnsdiscs and shall be hot-air welded to the Sarnafil deck membrane.



HOT-AIR WELDING OF SEAM OVERLAPS


      1. General



        1. All seams shall be hot-air welded. Seam overlaps shall be 5 inches (127 mm) wide when automatic machine-welding.




        1. Hand welding of details shall be 4 inch (100 mm) wide, except for certain details.




        1. Welding equipment shall be provided by or approved by Sarnafil. All mechanics intending to use the equipment shall have successfully completed a training course provided by a Sarnafil Technical Representative prior to welding.




        1. All membrane to be welded shall be clean and dry.





      1. Hand-Welding

Hand-welded seams shall be completed in two stages. Hot-air welding equipment shall be allowed to warm up for at least one minute prior to welding.



        1. The back edge of the seam shall be welded with a narrow but continuous weld to prevent loss of hot air during the final welding.




        1. The nozzle shall be inserted into the seam at a 45 degree angle to the edge of the membrane. Once the proper welding temperature has been reached and the membrane begins to "flow," the hand roller is positioned perpendicular to the nozzle and pressed lightly. For straight seams, the 1-1/2 inch (40 mm) wide nozzle is recommended for use. For corners and compound connections, the 3/4 inch (20 mm) wide nozzle shall be used.





      1. Machine Welding



        1. Machine welded seams are achieved by the use of Sarnafil's automatic welding equipment. When using this equipment, Sarnafil's instructions shall be followed and local codes for electric supply, grounding and over current protection observed. Dedicated circuit house power or a dedicated portable generator is recommended. No other equipment shall be operated off the generator.




        1. Metal tracks may be used over the deck membrane and under the machine welder to minimize or eliminate wrinkles.





      1. Quality Control of Welded Seams



        1. The Applicator shall check all welded seams for continuity using a rounded screwdriver. Visible evidence that welding is proceeding correctly is smoke during the welding operation, shiny membrane surfaces, and an uninterrupted flow of dark grey material from the underside of the top membrane. On-site evaluation of welded seams shall be made daily by the Applicator to locations as directed by the Owner's Representative or Sarnafil's representative. One inch (25 mm) wide cross-section samples of welded seams shall be taken at least three times a day. Correct welds display failure from shearing of the membrane prior to separation of the weld. Each test cut shall be patched by the Applicator at no extra cost to the Owner.




            1. MEMBRANE FLASHINGS

All flashings shall be installed concurrently with the roof membrane as the job progresses. No temporary flashings shall be allowed without the prior written approval of the Owner's Representative and Sarnafil. Approval shall only be for specific locations on specific dates. If any water is allowed to enter under the newly completed roofing, the affected area shall be removed and replaced at the Applicator's expense. Flashing shall be adhered to compatible, dry, smooth, and solvent-resistant surfaces. Use caution to ensure adhesive fumes are not drawn into the building.




      1. Sarnacol Adhesive for Membrane Flashings



        1. Over the properly installed and prepared flashing substrate, Sarnacol adhesive shall be applied according to instructions found on the Product Data Sheet. The Sarnacol adhesive shall be applied in smooth, even coats with no gaps, globs or similar inconsistencies. Only an area which can be completely covered in the same day's operations shall be flashed. The bonded sheet shall be pressed firmly in place with a hand roller.




        1. No adhesive shall be applied in seam areas that are to be welded. All panels of membrane shall be applied in the same manner, overlapping the edges of the panels as required by welding techniques.





      1. Install Sarnabar/Sarnacord according to the Detail Drawings with approved fasteners into the structural deck at the base of parapets, walls and curbs. Sarnabars may be required by Sarnafil at the base of all tapered edge strips and at transitions, peaks, and valleys according to Sarnafil’s details.




      1. Sarnafil's requirements and recommendations and the specifications shall be followed. All material submittals shall have been accepted by Sarnafil prior to installation.




      1. All flashings shall extend a minimum of 8 inches (0.2 m) above roofing level unless otherwise accepted in writing by the Owner's Representative and Sarnafil Technical Department.




      1. All flashing membranes shall be consistently adhered to substrates. All interior and exterior corners and miters shall be cut and hot-air welded into place. No bitumen shall be in contact with the Sarnafil membrane.




      1. All flashing membranes shall be mechanically fastened along the counter-flashed top edge with Sarnastop at 6-8 inches (0.15-0.20 m) on center.




      1. Sarnafil flashings shall be terminated according to Sarnafil recommended details.




      1. All adhered flashings that exceed 30 inches (0.75 m) in height or that of the perimeter Sarnabar spacings shall receive additional securement. Consult Sarnafil Technical Department for securement methods.




      1. All mechanically-attached flashings that exceed 18 inches (0.46 m) in height shall receive additional securement. Consult Sarnafil Technical Department for securement methods.



            1. METAL FLASHINGS




      1. Metal details, fabrication practices and installation methods shall conform to the applicable requirements of the following:



        1. Factory Mutual Loss Prevention Data Sheet 1-49 (latest issue).

        2. Sheet Metal and Air Conditioning Contractors National Association, Inc. (SMACNA) - latest issue.





      1. Metal, other than that provided by Sarnafil, is not covered under the Sarnafil warranty.




      1. Complete all metal work in conjunction with roofing and flashings so that a watertight condition exists daily.




      1. Metal shall be installed to provide adequate resistance to bending to allow for normal thermal expansion and contraction.




      1. Metal joints shall be watertight.




      1. Metal flashings shall be securely fastened into solid wood blocking. Fasteners shall penetrate the wood nailer a minimum of 1 inch (25 mm).




      1. Airtight and continuous metal hook strips are required behind metal fascias. Hook strips are to be fastened 12 inches (0.3 m) on center into the wood nailer or masonry wall.




      1. Counter flashings shall overlap base flashings at least 4 inches (100 mm).




      1. Hook strips shall extend past wood nailers over wall surfaces by 1½ inch (38 mm) minimum and shall be securely sealed from air entry.


SARNACLAD METAL BASE FLASHINGS/EDGE METAL
All flashings shall be installed concurrently with the roof membrane as the job progresses. No temporary flashings shall be allowed without the prior written approval of the Owner's Representative and Sarnafil. Acceptance shall only be for specific locations on specific dates. If any water is allowed to enter under the newly completed roofing due to incomplete flashings, the affected area shall be removed and replaced at the Applicator's expense.


      1. Sarnaclad metal flashings shall be formed and installed per the Detail Drawings.



        1. All metal flashings shall be fastened into solid wood nailers with two rows of post galvanized flat head annular ring nails, 4 inches (100 mm) on center staggered. Fasteners shall penetrate the nailer a minimum of 1 inch (25 mm).




        1. Metal shall be installed to provide adequate resistance to bending and allow for normal thermal expansion and contraction.





      1. Adjacent sheets of Sarnaclad shall be spaced ¼ inch (6 mm) apart. The joint shall be covered with 2 inch (50 mm) wide aluminum tape. A 4 inch minimum (100 mm) wide strip of Sarnafil flashing membrane shall be hot-air welded over the joint.


EDGE-TITE METAL


      1. Position the Sarnafil membrane over the roof edge and down outside face of wall covering wood nailer(s) completely. Allow ½ inch (13 mm) excess membrane. Hot-air weld all seams making sure there are no voids in welds.




      1. Apply a 3/8 inch (10 mm) bead of Sarnafil sealant to the intersection of the right angle of the clean base rail. Install base rail from right to left as seen from rooftop, lapping joints 1 inch (25 mm).




      1. Fasten base rail into the side of the nailer 12 inches (0.3 m) on center using #12 x 1-5/8 inch corrosion-resistant fasteners provided with Edge-Tite. Field cut sections as necessary. A second row of fastening may be required based upon site conditions. Exercise caution at perimeter of roof. Workers shall follow OSHA safety procedures.




      1. Position spring clips at 6 foot (1.8 m) centers on base rail. Locate spring clips at fascia cover laps and at mid-span of fascia cover.




      1. Fascia covers are installed from right to left as seen from rooftop. Position fascia cover on top of base rail and overlap preceding panel by 1 inch (25 mm) at notches provided. Snap covers into place. Field cut where necessary. Exercise caution at perimeter of roof. Workers shall follow OSHA safety procedures.


ANCHOR-TITE METAL


      1. Position the Sarnafil membrane over the roof edge and down outside face of wall covering wood nailer(s) completely, allowing ½ inch (13 mm) excess membrane. Hot-air weld all seams making sure there are no voids in welds.




      1. Apply a 3/8 inch (10 mm) bead of Sarnafil sealant to the intersection of the right angle of the clean base rail. Install base rail from right to left as seen from rooftop, lapping joints 1 inch (25 mm).




      1. Fasten base rail into the side of the nailer at 12 inches (0.3 m) on center using #12 x 1-5/8 inch corrosion-resistant fasteners provided with Anchor-Tite. Field cut sections as necessary. A second row of fastening may be required based upon site conditions. Exercise caution at perimeter of roof. Workers shall follow OSHA safety procedures.




      1. Fascia covers are installed from right to left as seen from rooftop. Position fascia cover on top of base rail and overlap preceding panel by 1 inch (25 mm) at notches provided. Snap covers into place. Field cut where necessary. Exercise caution at perimeter of roof. Workers shall follow OSHA safety procedures.


WALKWAY INSTALLATION


      1. Sand Coated Walkway

Roofing membrane to receive Sand Coated Walkway shall be clean and dry. Place chalk lines on deck sheet to indicate location of Walkway. Clean the deck membrane in areas to be welded. Walkway shall be unrolled and positioned within the chalk lines. Hot-air weld the entire perimeter of the Walkway to the Sarnafil deck sheet. Check all welds with a rounded screwdriver. Re-weld any inconsistencies. Important: Check all existing deck membrane seams that are to be covered by Walkway with rounded screwdriver and reweld any inconsistencies before Walkway installation. Do not run Walkway over Sarnabars.




      1. Sarnatred Walkway

Roofing membrane to receive Sarnatred Walkway shall be clean and dry. Place chalk lines on deck sheet to indicate location of Walkway. Apply a continuous coat of Sarnacol 2170 adhesive to the deck sheet and the back of Walkway in accordance with Sarnafil's technical requirements and press Walkway into place with a water-filled, foam-covered lawn roller. Clean the deck membrane in areas to be welded. Hot-air weld the entire perimeter of the Walkway to the Sarnafil deck sheet. Check all welds with a rounded screwdriver. Re-weld any inconsistencies. Important: Check all existing deck membrane seams that are to be covered by Walkway with rounded screwdriver and reweld any inconsistencies before Walkway installation. Do not run Walkway over Sarnabars.




      1. Concrete Pavers

Weld the edges of a protection layer of G410 membrane in place. Place normal weight concrete pavers on the protection membrane. In areas of high wind exposure the pavers shall be strapped together with stainless steel metal straps that are flush with the paver surface. Do not run walkway over Sarnabars.



            1. TEMPORARY CUT-OFF

All flashings shall be installed concurrently with the roof membrane in order to maintain a watertight condition as the work progresses. All temporary waterstops shall be constructed to provide a 100% watertight seal. The stagger of the insulation joints shall be made even by installing partial panels of insulation. The new membrane shall be carried into the waterstop. The waterstop shall be sealed to the deck and/or substrate so that water will not be allowed to travel under the new or existing roofing. The edge of the membrane shall be sealed in a continuous heavy application of sealant as described in Section 2.09. When work resumes, the contaminated membrane shall be cut out. All sealant, contaminated membrane, insulation fillers, etc. shall be removed from the work area and properly disposed of off site. None of these materials shall be used in the new work.


If inclement weather occurs while a temporary waterstop is in place, the Applicator shall provide the labor necessary to monitor the situation to maintain a watertight condition.
If any water is allowed to enter under the newly-completed roofing, the affected area shall be removed and replaced at the Applicator's expense.

            1. COMPLETION

Prior to demobilization from the site, the work shall be reviewed by the Owner's Representative and the Applicator. All defects noted and non-compliances with the Specifications or the recommendations of Sarnafil shall be itemized in a punch list. These items must be corrected immediately by the Applicator to the satisfaction of the Owner's Representative and Sarnafil prior to demobilization.


All Warranties referenced in this Specification shall have been submitted and have been accepted at time of contract award.

            1. DETAILS

See accompanying Sarnafil detail drawings. Refer to the Sarnafil Typical System Details section for additional details.


Sarnafil has attempted to obtain information from the manufacturers of other products often used in conjunction with Sarnafil products with respect to the characteristics of such products, as well as their compatibility with Sarnafil's products. In as much as these other products as supplied in the field are subject to possible variation in their productions, and in as much as their specifications and performance characteristics are subject to change without notification by the manufacturers, Sarnafil expressly excludes from its warranty any responsibility for the performance or quality of the products of others used in conjunction with Sarnafil products. Sarnafil provides this specification as a guide only in technical support to architects or roof designers/specifiers. Sarnafil assumes no liability for error in design of or for misuse of this guide specification. The roof designer, engineer, architect or contractor must verify suitability of the specification and details.

MECHANICALLY-ATTACHED SARNAFAST S327 DETAIL DRAWINGS










DRAWING




FILE NAME

ME-ISO

Engineered (mechanically-attached) System isometric

ME-ISO

ME-1A

Typical perimeter/corner layout plan

ME-1A

ME-1B

Intersection of bar and coverstrip at corner

ME-1B

ME-1C

Section of Interior bar spacing

ME-1C

ME-1D

Detail at Sarnabar joints

ME-1D

ME-1E

Sheet & fastener layout plan at perimeter edge

ME-1E

ME-1F

Sheet & bar layout layout at parapet edge

ME-1F
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