How to insulate walls thicker than standard batts?

Chip C · 2012-02-16T04:32:53+00:00

My walls have been furred out with 2-by's but because the old studsactually measure 4" or more (and in some places were furred outpreviously, for whatever reason) they are much thicker than the 5.5"R-22 mineral wool batts that are going in them. In some places there'smore than an inch of air space between the batt and the vapourbarrier.Manufacturer's instructions say "Ensure the surface of each batt isflush with the interior surface of the studs" but doesn't really saywhat happens if you don't.Big problem? Am I decreasing my R-value from the nominal R-22, or am Ijust losing an opportunity to gain a few more R's?I presume the only fix is to fillet extra batts to the right thicknessand put them in, and that leaving the space at the outer wall is asbad, or worse...Thanks,Chip CToronto

Feb 16, 2012 20 Replies

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clare 14 years ago

Don'r use the white bead-board. The pink or blue closed cell stuff has good R Value, and is structurally much stronger and acts as both vapout barier and thermal break.

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How to insulate walls thicker than standard batts?

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