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Old 01-18-2012, 04:16 PM   #1
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Using Composite Boards as shims


I am considering cutting long, 8 foot shims to correct a joist leveling problem (1 inch over 8 feet).
I thought about using composite boards for this. It seems they would be better than wood because of low compression and change due to temp and humidity. Any thoughts/experiences?
Thanks in Advance,

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Old 01-18-2012, 06:03 PM   #2
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Using Composite Boards as shims


Shims are generally so thin that changes in dimension due to humidity changes are not an issue. If you need really fat shims, they aren't shims, they are stock lumber. As for the composite boards, a lot of them are made from a combination of plastic and sawdust, and they are not particularly strong or stiff, less so than standard lumber in most cases. For your application, I would use a strong hardwood shim such as oak, maple or ash. If you cannot get that type of lumber, you could use hard pine. Sounds like you will need to rip it on the tablesaw, maybe even use a tapering jig.

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Old 01-18-2012, 06:11 PM   #3
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Using Composite Boards as shims


Oh not this again.
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Old 01-18-2012, 07:05 PM   #4
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Using Composite Boards as shims


It all good. To cut the "shims" do you have a table saw? or a circular saw?
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Old 01-18-2012, 08:28 PM   #5
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Using Composite Boards as shims


I hereby nominate tapering jigs as a Sticky topic.
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Old 01-18-2012, 08:33 PM   #6
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Using Composite Boards as shims


And why not sister joist to level it. Pull two strings across the joist and set them to be even with the strings.
Better yet figure out what there not level and fix that.
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Old 01-18-2012, 08:36 PM   #7
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Using Composite Boards as shims


Yes, I have. Good table saw.
As for sistering, the 2x10 joists are already sistered, just not level.
Good idea about using oak or another hard wood.

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