Arizona Roofer

Your Roofing Questions Answered

Foam Split in Plywood Seam

February 20th, 2012

In this tutorial I’m going to show you how to fix a small foam split next to a plywood seam. As a rule of thumb foam that is sprayed directly over plywood will not leak. This is because water cannot travel underneath the foam because it’s fully adhered to the wood. However there are some exceptions to this rule

1. A leaking penetration i.e. pipe , t-top, scupper ect.

2. A split at a plywood seam.

This split is only about 1 1/2 inches long but the damage it did inside was incredible.

foam split next to plywood seam

foam split next to plywood seam

As you can see this is a very small split that can go unnoticed. Typically something like this would never leak. But what gives it away is the plywood seam right next to it.

1. First cut one side of the split in a V pattern

 

Split through to seam

Split through to seam

2. Next use a polyurethane caulking to fill the crack. (It’s important you V it out don’t just caulk the top it will split again)

Caulk the hole

Caulk the hole

3. Tool the caulk with you finger or cardboard. Make sure you go past all the edges of the cut.

Tool the caulking

Tool the caulking

4. Now the repair is finished you can coat the caulking with elastomeric coating.

Complete repair

Complete repair