Hi guys, I'm installing celotex between rafters (and below, but that's later). I have already drilled the top of the normal noggins under gable straps with 16mm holes to allow airflow but the small space between the gable wall and the last truss is a bit tricker as there are also other joists at 90 degrees to the last rafter going through the wall that I guess support the last bit of the roof and fascia beyond the gable wall.
My question is, is it ok for me to stick a couple of 16mm holes in the top half of these joists (joists 95mm) and then cover with celotex so I maintain a 50mm gap between the sarking felt and the topmost side of the celotex in this small 150mm void? If not and I need to reinforce somehow what would be the easiest/best way considering the very confined space and only partial access to these joists?
I know 16mm holes not quite enough for 25mm airflow but better than nothing and I think there is some airflow through the wall around these joists also (it def isn't airtight)
Thanks for any suggestions!
My question is, is it ok for me to stick a couple of 16mm holes in the top half of these joists (joists 95mm) and then cover with celotex so I maintain a 50mm gap between the sarking felt and the topmost side of the celotex in this small 150mm void? If not and I need to reinforce somehow what would be the easiest/best way considering the very confined space and only partial access to these joists?
I know 16mm holes not quite enough for 25mm airflow but better than nothing and I think there is some airflow through the wall around these joists also (it def isn't airtight)
Thanks for any suggestions!