How to close this

[wcavanagh]

How does this get closed? Before insulation goes in?

My builder wants to just put Insulation in, surely that’s not right?

thanks

 

[RonnyRaygun]

You put your PIR insulation between the rafters as far as the far edge of the wall plate, ensuring a minimum 25mm air gap above the insulation. Then you nail your fascia and soffit boards to the ends of the rafters to close it, providing vents if necessary.

 

[RonnyRaygun]

Something like this...

 

[wcavanagh]

Awesome thank you

 

[noseall]

Shouldn't we be seeing the back of the soffit and fascia in the one image?

 

[wcavanagh]

It’s not installed yet

 

[^woody^]

That should be closed with a fire resistant material not just any old insulation

 

[RonnyRaygun]

That should be closed with a fire resistant material not just any old insulation

Isn't that what the plasterboard does??

 

[SpecialK]

Should the roof window rafters either side be doubled?

 

[^woody^]

Isn't that what the plasterboard does??

30 minutes for PB. Compartmentation/boundary would normally need 60 minutes

Not forgetting the services behind the plasterboard that may pose a fire risk, or fire/hot smoke getting in.

It's all down to the details and specifics (it might be a shed in the middle of a field), but good practice would mean properly sealing for fire risk