Forum Title: Patch Underlayment Seams?
Do you put patch in your underlayment seams? Some do and some don't. Why?
Category: Flooring Post By: Sam Formisano (Durham, NC), 03/11/2019

I never do. I install the sheets tight together and sand the whole floor after stapling. It's how I was taught many years ago. I have seen intallations where movement has caused patch (or whatever has been used) to crack and come loose under the vinyl.

- JOHNNIE CHANDLER (Surprise, AZ), 04/22/2019

Ideally, no patch if it is true underlayment grade plywood. Sand until the abutting edges are smooth and even. Halex plywood underlayment has green X's where the staples go. They say to sand the edges until the green color begins to be removed from both edges.

- Timothy Gob (Lehigh, PA), 04/30/2019

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