How To Weld A Membrane Roof

Epdm cannot be welded and cannot be re taped when the weather is too cold to use primer and adhesives requiring a temporary fix until the weather warms up.

How to weld a membrane roof.

Good welds require a lot of force but it s the way the weld comes apart that s the key. Single ply roof membranes are typically categorized as thermoplastic membranes. The two most common thermoplastic single ply roof membranes are polyvinyl chloride pvc and thermoplastic olefin tpo. One of the key benefits of thermoplastic membranes is the ability to heat weld their seams and create a permanent seal.

Simply clean the membrane and heat weld directly to it. Weld the 18 457 mm pieces together and then allow the membrane a few minutes to cool. Tpo is thermoplastic so you can heat weld seams and it s ideal for repairs. The only way you will get a consistent weld is by removing the water from above and beneath the membrane and allowing the membrane time to naturally dry out before using acetone.

Cut a 1 25 mm wide strip across the welded material. Both new materials and for roof membranes exposed to the elements so as to ensure a proper weld. The welds are tested by pulling the weld apart by hand. Another option when not wanting to use a solvent cleaner is to position the repair under the existing membrane which in theory should be clean and free from moisture.

Kee membrane seams membrane welding pvc roofing single ply thermoplastic membranes tpo. Thermoplastic single ply roof membranes have been around for more than 40 years. Slowly but consistently work your way down the seam rolling over both layers with steady pressure on the seam roller with long steady strokes till you reach the end of the seam or area you are welding. How to install tpo roof membrane easy photo guide step 1.

Epdm membrane is rolled out on the flat roof then the contractor returns and secures the seams with a layer of seam tape or an additional adhesive. As you begin to weld by heating the membrane always use the seam roller at a 90 degree angle to the heat gun.