Roof Preparation: Step 1 of 3 (Foam Roofing Installation)
First, the roof surface is prepared for the foam roof installation. Foam roofing systems do not rely on the old roof membranes for waterproofing. When necessary, old roof membranes are torn-off. However, after a thorough preparation, existing roof membranes usually serve as excellent substrates for new foam roof systems. Re-purposing the old roof membrane as a substrate helps the environment by reducing landfill waste.
This tar and gravel roof is ready for step 1, roof preparation.
Foam Roofing Systems are Ideal for Re-Roofing Tar & Gravel
The tar and gravel roof above is a good candidate for a foam roof system. Before the foam roof system is applied several steps are taken including the following:
- Dirt and gravel are removed and hauled to a recycling facility.
- Structural roof deck is inspected for dry-rot; structural repairs are performed. Removal of existing roof membranes is often required in cases having extensive wood damage
- Deteriorated edge flashing and vent caps are replaced.
- Substrate is fastened to the roof deck. A new substrate, such as heavy tar paper, foam board and/or fiber board is installed in cases where existing roof membranes are not reused.
What Substrates and Slope Levels are Ideal for Foam Roofing Systems?
Your current tar and gravel (built-up roof), single ply, torch-down, or similar roof system will make an excellent substrate for a new foam roof system. Flat and low slope roofs of varying pitches make ideal candidates for foam roofing. Generally, foam roofs are not too steep to walk on or have a maximum pitch of 4″/12″.