Welding Single Ply Roofing Membranes - Application Guidelines

Welding T-Joints & Cross-Joints

At T-joints, the thickness of the middle sheet has to be chamfered back to “zero” with a chamfering tool or the 40mm flat nozzle of the hot air gun. In order to minimize this operation it is advisable to round off the edge or cutting off a triangle of the middle sheet or to weld the two lower membranes over the width of the overlap.

On the other side a cross seam meets a continuous sheet below. The edge of the middle sheet should also be rounded or cut off.
When planning the layout of the sheets cross-joints should be avoided. When the roof is long or when this should prove to be too arduous a membrane strip of min. 300 mm width shall be centred and welded over the overlap. Treatment is similar to that of T-joints.

Step 1

T-Joint is created between perpendicular
sections of Monarplan single ply roofing membrane

T Joint 01 

Step 2

Sections of Monarplan single ply roofing membrane are welded over the T-Joint as a cover patch
T Joint 02
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