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What plywood thicknesses will add up to 1.125" thick?

What plywood thicknesses will add up to 1.125" thick?

#1
10-13-16, 11:21 AM
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Join Date: Feb 2013
Location: USA
Posts: 24
What plywood thicknesses will add up to 1.125" thick?

I removed some old tongue and groove flooring to reroute some plumbing. The flooring is 1-1/8" thick. I'm trying to figure out what combination of plywood I need to stack to match this but I suck at math, especially fractions. Thicknesses like 27/32" are really throwing me off . Any help is appreciated.
Thanks,
Don

#2
10-13-16, 11:26 AM
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Join Date: Dec 2004
Posts: 26,825
2 layers of 5/8 would get you really close. 5/8 is 19/32. 2 layers would be 38/32... which is 1 6/32"... or 1 3/16"... just a hair thick.

A layer of 5/8 plus a layer of 1/2 would be just a hair thin.

#3
10-13-16, 11:33 AM
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Join Date: May 2015
Location: USA
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3/4 nominal plus 1/2 nominal will be a little over 1 1/8.
3/4 nominal plus 3/8 nominal will be a little under 1 1/8

I'd probably use 3/4 and 3/8 and shim with a few pieces of rosin paper in between to get it to match exactly.

3/4 nominal is about 23/32 actual.
1/2 nominal is about 15/32 actual.
3/8 nominal is about 11/32 actual.

You want a total of 36 32nds

But even these can vary quite a bit depending on where it is made, etc, etc. So easier to go under a bit and shim.

Last edited by CarbideTipped; 10-13-16 at 02:27 PM.
#4
10-13-16, 12:44 PM
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Location: NC, USA
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I go a tad on the thin side then use tar paper as a shim between the layers of plywood to bring it up to the proper thickness. If you want to cheat you can usually get away with only shimming the areas where it meets another surface like the transition to the next room.

If you are feeling strong Advantech (a premium OSB sheeting) is available in 1 1/8" thickness. I've got to warn you though it's insanely heavy. If you use it you'll have the strongest floor you've ever seen but you'll need a hernia operation if you try to pick up a sheet by yourself.

#5
10-14-16, 06:28 AM
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Join Date: Feb 2013
Location: USA
Posts: 24
Thank you, everyone, for you're helpful input. I'll go thinner (3/4" and 3/8" nominal) and shim up with heavy paper. You all made this sound easy.