When adhered the insulation layers are glued down using ribbons of foam adhesive.
Roof elements that requires to be mechanichally attached.
Center hole as supplied by tremco inc.
Mechanically attached roofing systems are ideal for many different types of buildings and can be an economical solution where conditions are suitable.
G u i d e s p e c versiweld tpo mechanically attached roofing system july 2020.
Fasteners shall be as listed on the current approved fastener.
Mechanically attach membrane with screws and plates to the substrate at locations of deck slope changes in excess of 1 12.
Refer to the tpo pvc attachment table for mechanically attached systems in the guide for complete requirements.
There are no maximum slope restrictions for the application of the fully adhered roofing system.
A typical 100 square roof with two layers of polyiso insulation can be mechanically attached and the roof fully closed up in five days with an optimum crew.
Stress plates and screws are used to fasten the membrane in place.
The system uses a roof membrane mechanically attached to the roof surface insulation attached to the deck and a vapor retarder.
For example a typical mechanically attached roof may only require 5 fasteners per each 4 x 8 insulation board which is secured to the substrate.
It s the simplest and lowest cost way of applying a heat welded single ply system that can practically be installed year round with warranties of up to 30 years.
If the membrane is also mechanically attached only five fasteners per 4 x8 board are required since the membrane has its own fasteners.
State that if a mechanically attached roof cover is being used that an air barrier below the insulation must be used and that it shall be fully adhered to penetrations and roof perimeters.
For roof membrane fastening stress plates shall be two inch 2 3 8 o d.
We actually use 6 one at each corner and then one at the middle of both edges.
Fastener pullout tests shall be conducted on the purlins with approved fasteners.
State that if a mechanically attached roof cover is being used that the prescribed thermal r value shall be increased by 50 percent.
The membrane is fastened to the roof deck by powerful adhesives.
Sheets of insulation are laid out on the decking and fastened according to the system specifications.
The maximum recommended roof slope for mechanically attached roofing systems is 18 in one horizontal foot.
This guide spec is a brief outline of versico s versiweld mechanically attached roofing system requirements and is intended for use as a submittal with a bid package.
The mechanically attached roofing system is not acceptable for installations on steel decks lighter than 22 gauge.
In this case there would be one fastener in the middle of the board and one at each corner.
