In order to support R20 insulation in my basement, should I only use 2x6 studs since R20 insulation materials has 5 1/2" thickness? I'm thinking of just using 2x4 as I'm fighting for space but unsure if this is allowed.
You don't want to compress the insulation. This is why R 20 should go with 2x6 construction. If you were to put it into 2x4 walls, you are defeating the purpose. Either go with 2x6 or lower the R value to accomodate the wall thickness.
Appreciate the reply. It makes sense to use 2x6 frame to support R20. So for the rest of the interior walls, 2x4 should be fine then.
What about blanket insulation with R 20 which is 1 inch thick then 2 x 3 frame on top?
Is the order of installation - Tyvek (reversed) on concrete wall first, then blanket insulation before framing? No space needed in between Tyvek and blanket insulation?
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