Im building a small porch on the rear of my house (2.5×1.5m ish). They will be an L Shaped wall 1m high and 1.5 x 0.9m and the rest pvc. Im looking at doing a cavity wall for this so I see it has, breeze block below ground, brick 4 courses up (for looks) then breeze block up to below window then rendered. using aerated blocks on inner wall above dpc. The cavity 50mm air and 50mm kingspan or is 75mm rockwool wall to wall ok?
cavity wall construction
- Thread starter leekr
- Start date
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Either will do, but why insulate a porch?
Im just concerned about getting damp in there over winter and thought this may help. Ive done plenty of reading up on wall construction but couldn't find much on the 75mm rockwool detail. Is it has simple has block - 75mm rockwool - block with no air gap. Also is 50mm rockwool ok to use in the same way? has this would make more room in the porch
You can use any thickness of insulation batt (a conservatory is exempt from building regs) but the batt must fill the cavity completely to ensure no rain penetration.
But in the absence of heating, your porch will still be cold and therefore potentially damp through condensation.
But in the absence of heating, your porch will still be cold and therefore potentially damp through condensation.
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Correct; you would build one skin up a few course, put the batt against it, and then build the other skin up to it.
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