Should I put foam under the entire garage floor?

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You only have one chance to get it right! Foam has joints that need to be addressed. So put on the belt, stretch on the suspenders and make sure your fly is zipped up.
 
yooper,here in Nova Scotia construction tape,(Tuck Tape),is used.The edges of the extruded foam boards is half lapped while the ends are not.Tape all joints if you don't plan to use poly.That being said the poly adds a minimal cost,is relatively easy to install and gives that added protection so should be used.Also pays to tape all joints or laps in the poly V/B.

Earl
 
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