Sarnafil S327 Mechanically-Attached Engineered System Introduction



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Insulation shall be mechanically fastened to the deck with approved fasteners and plates at a rate according to the insulation manufacturer's, FM's and Sarnafil's recommendations for fastening rates and patterns. The quantity and locations of the fasteners and plates shall also cause the insulation boards to rest evenly on the roof deck/substrate so that there are no significant and avoidable air spaces between the boards and the substrate. Each insulation board shall be installed tightly against the adjacent boards on all sides.




        1. Fasteners are to be installed consistently in accordance with fastener manufacturer's recommendations. Fasteners are to have minimum penetration into structural deck recommended by the fastener manufacturer and Sarnafil.




        1. Use fastener tools with a depth locator and torque-limiting attachment as recommended or supplied by fastener manufacturer to ensure proper installation.



SEPARATION LAYER INSTALLATION
[Note to Specifier: Only needed over non-compatible insulation or substrate].
Approved separation layer shall be installed directly over expanded or extruded polystyrene (unless supplied with a compatible facer). Unfaced polystyrene is incompatible with Sarnafil membranes without a separation layer.


      1. General Criteria



        1. Separation layer shall be installed according to Sarnafil’s instructions.

        2. Separation layer shall be neatly cut to fit around penetrations and projections.

        3. Do not install more separation layer than can be covered with Sarnafil membrane by the end of the day or the onset of inclement weather.

        4. Mechanical Attachment:





  1. Separation layer shall be mechanically fastened to the deck with approved fasteners and plates at a rate according to Sarnafil’s recommendations for fastening rates and patterns.

  2. Fasteners are to be installed in accordance with fastener manufacturer’s recommendations. Fasteners are to have minimum penetration into structural deck recommended by fastener manufacturer and Sarnafil.

  3. Overlap separation layer edges 4 inches (100 mm) and fasten through the overlaps at 24 inches (0.6 m) on center using Sarnafasteners and Sarnaplates to hold in position. The installation of the separation layer is to be followed immediately by the installation of the S327 membrane.

INSTALLATION OF SARNAFIL MEMBRANE


The surface of the insulation or substrate shall be inspected prior to installation of the Sarnafil roof membrane. The substrate shall be clean, dry, free from debris and smooth with no surface roughness or contamination. Broken, delaminated, wet or damaged insulation boards shall be removed and replaced.


      1. General



        1. Sarnafil S327 membrane is to be attached with Sarnafasteners and Sarnabar according to Sarnafil’s and Factory Mutual’s requirements.

        2. Membrane overlaps shall be shingled with the flow of water where possible.

        3. Sarnabars shall be fastened perpendicular to the direction of the steel deck flutes, wood plank, or precast panel where possible.

        4. Tack welding of S327 full or half-width rolls for purposes of temporary restraint during installation is not permitted. Consult Sarnafil’s Technical Department for further information.





      1. Perimeter and Corner Areas



        1. Over the properly installed and prepared substrate surface, Sarnabars are to be installed on top of the S327 membrane and parallel with the entire perimeter edge. The number of perimeter and corner Sarnabars will be determined by building height and width and other conditions according to FM guidelines and Sarnafil Technical. Sarnafasteners are installed through the Sarnabar, through the S327 membrane and into the roof deck or structural framing. Fasteners shall clamp the S327 membrane tightly to the substrate. All Sarnabars are covered with a welded (S327) coverstrip above them for watertightness. See Detail Drawings.

Notes:



                  1. Perimeter area is defined as the outer boundary of the roof. If the roof is broken into different levels, each roof area shall be treated as an individual roof with its outer boundary being treated as a perimeter. Typically, internal expansion joints and firewalls are not considered to be full perimeters. Refer to Factory Mutual’s Data Sheet 1-28 for more information.

                  1. The ridge area is defined as the high point in the roof area formed by two intersecting planes. When the sum of the slopes is a minimum of 4 inches in 12 inches (30 degrees), each side of the ridge shall be treated as a perimeter area.



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





      1. Interior Area



        1. Over the properly installed and prepared substrate surface, Sarnabars are to be installed on top of the S327 membrane and perpendicular to the steel deck flutes or wood plank. The spacing and fastening of Sarnabars will be determined by building height and width and other conditions according to FM guidelines and Sarnafil Technical. Sarnafasteners are installed through the Sarnabar, through the S327 membrane and into the roof deck or structural framing. Fasteners shall clamp the S327 membrane tightly to the substrate. All Sarnabars are covered with a welded (S327) coverstrip above them for water tightness. See Detail Drawings. Hot-air weld overlaps according to Sarnafil’s recommendations.




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