Forum Title: Underlayment in FCI
If you have read Ray Thompson's article on installing underlayment in FCI mag, what do you think? I disagree with some of what he says. Give me your thoughts and then I'll tell you what I disagree with.
Category: Flooring Post By: KRISTINA SINGH (St. Petersburg, FL), 02/24/2019

Floorist said: ? If you have read Ray Thompson's article on installing underlayment in FCI mag, what do you think? I disagree with some of what he says. Give me your thoughts and then I'll tell you what I disagree with.Click to expand... *************************************** I do plywood jobs probably less than once a year as a commercial guy but when I did some residential work a zillion years ago we used plywood that HAD to be gapped at the seams. I was trained to put a matchbook cover thickness between sheets and nail off from the center out 6-8 inches in the field and 2 staggered along the seams. In kitchens I'd have the mallet. On small commercial I'd use rink shank nails. Only a couple schools I can recall we used the compressor and staples. I don't recall ever sanding the subfloor but if a joint was cocked up we'd slam enough nails in to beat it back down. We did use a belt sander after each coat of patch, usually two on all the seams. I never seen anyone acclimate plywood, especially with the idea you could open up the sheets and lay them out apart from each other. That just doesn't happen in commercial work that I've ever seen. It's obviously a great idea. Probably if we did a BIG job with plywood we'd do that though, maybe even including testing with the meter.

- GERTRUDE SHELTON (Encinitas, CA), 05/17/2019

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