Copper pipes 1/2″ from wall. If I spray foam but leave a 4″ gap where the pipes are, will heat loss be negligible or concentrated?
I imagine heat loss along this strip will be much higher per square inch than if the whole wall was bare. I’m not saying the wall would be better with no insulation. I’m wondering if the logic “oh it’s just a thin strip so no worries” would be wrong because the heat will flow faster thru the strip than a generic 4″ high wall space, because the heat won’t be able to flow anywhere else. If the flow is faster, might it be significant enough to justify spending $250 (?) to move the pipe / replace it with PEX?
(20 foot wall. I’m not expecting anyone to do math for me, I’m just giving a sense of the size of gap.)
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