Fitting and Installing 1/4 Inch Underlayment

Old 03-12-06, 11:50 AM
Thread Starter
Join Date: Mar 2004
Location: CO
Posts: 614
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Fitting and Installing 1/4 Inch Underlayment

I'm cutting and fitting my "Multiply Plywood" 1/4" underlayment. Instructions from Multiply Plywood say to leave a 1/8" gap between sheets, then to fill the gap. I plan to put vinyl tiles on top. If I have to fill the gap, why cut it in the first place???

And what would be the best filler? I will be using Armstrong tiles. Probably an Armstrong filler, I suppose.

Can't get through to the Multiply company to get this question answered.

Finally, If I have to "unsquare" a 4x4 sheet of plywood by 1/8 to 1/2 inch or so, how does a table saw do that? I thought the fence was always parallel to the blade???
Old 03-17-06, 03:22 PM
Join Date: Nov 2000
Location: Austin, TX
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Any latex portland cement patching compound will work. So you have to add the latex milk and some have it in the powder, and you only mix with water.

I see more problems from leaving the gap and filling it, then when they are butted and sanded. The key to success is to acclimate the underlayment and not just bring it in and install it immediately.

Cut it slowly with a circular saw, or be careful with the table saw free handed.

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