Anti gravity insulation required

[cwr]

Despite achieving my desired u value with PIR between and under the rafters, thought I may as well fill the service void with something on our vaulted ceiling. Got some glass wool stuff, works out about £1.5/m2. I'll just stuff some in, or so I thought... Problem is its a real pita to stop it falling, not helped by the rolls being partially pre cut into narrow stripes.

 

Gonna try staples tomorrow, need a faster way to secure it as there's a big enough area to do.

[JohnMo]

Wrong stuff, you need to use something more stiff.  Acoustic insulation is the same R value but stiffer, but high density Rockwool (or others) would be better.

[ProDave]

Frametherm 35 is stiff enough for that, but not sure it is available that thin.  Look at wall batts that might be available that thin.

[dpmiller]

string and staples.

[PeterW]

We cut ends of rolls of vapour membrane into strips about 50mm wide on the chop saw and then use it stapled to the rafters. Seems to stay put. 

[Russell griffiths]

Buy a roll of packing banding, then staple it, more ridged than string. 

[Dreadnaught]

This? 

https://www.toolstation.com/stick2-contact-adhesive/p47790

[Pocster]

I just did pir and foam 

[cwr]

Thanks for the suggestions.

After some experimenting i found that staples to the horizontal battens and a little tucking in under the vertical ones worked well enough. Two evenings work to do both sides, about 70m2.