How to Replace Old Bitumen Membrane How to Replace Old Bitumen Membrane
The bitumen membrane is a water proof layer that acts as an adhesive on which to fix roofing tiles. When spread out properly, it can provide the right roofing protection for many years.
Step 1- Preparing the Surface
Clean the surface, and leave it to dry for a few days. This will remove the old scraps of bitumen membrane that may produce uneven results.
Step 2- Laying the Foundation
Lay the felt paper, and hammer the nails about a foot apart, to hold it in place. Ensure the felt does not form sloppy bumps, and attach the drip end flashings on the edges of the roof.
Step 3- Applying the Primer
Apply the primer using a brush, or you can use the sprayer if you are working on a large surface. The choice of primers depends with the coating to be applied. In this case, use a bitumen primer.
Step 4- The Rolling Stage
Place the bitumen membrane on the surface, and clear out any bumps. Cut it a few inches away from the edge, to leave an allowance and roll it away from the surface.
Step 5 – Heating the Surface
Roll the bitumen membrane 1/2 way back, so that you expose the surface. Do so carefully, because you want to heat the surface and then lay the roll slowly. Light the propane torch, and heat the exposed surface. Work on a small part at a time, and unroll the bitumen membrane onto the heated part. Once you complete 1 side, move to the other and roll up the bitumen membrane half way. Heat the surface and bring the roll back to the surface.