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Yep that is correct. And I left the battens a bit gappy so nothing is fully fully enclosed - just in case. Kingspan/celotex/ecotherm all have guides on the subject. CharlieDIYte on YT also has a video - although he did dot and dab.
Your north wall/lowest point on the roof/air brick scenario is exactly the same as ours. Knocking back to brick wasn't an easy decision but am glad I did it - the room was small enough as it is.
I used these boards https://www.selcobw.com/products/plaster-drylining/plasterboard-accessories/plasterboard/gtec-thermal-pir-tapered-edge-2400-x-1200-x-37-5mm
Many thicknesses to choose from, I elected for 37mm which has 25mm of PIR insulation. It would not meet current U value requirements, but provided you aren't doing more than 50% of the walls in the room, you don't need BC sign off, and I felt the improvement with 25mm would be sufficient.
Hovis-
👍
and I felt the improvement with 25mm would be sufficient
Sounds like it was the right call.
Upgrade to warmth is major, long may our son slumber when he returns.
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I don't think you'd need building control involved at all unless it was a new extension being built.
I could be very wrong, of course.
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Do you think that type of board would offer any kind of acoustic insulation? I reckon the wall in my office that separates that room and our bedroom might need totally redone so wondering if it would be worthwhile doing it with something that helps keep my work noise out of the bedroom in case I'm working late or mini_com is napping in there during the day.
hugo7
musa
NotThamesWater
stevo_com
swoon
It looks great. Probably a stupid question, but you screwed the insulated board onto the battons right? Which then leaves a small air cavity the depth of the roofing battens?