How to close this

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How does this get closed? Before insulation goes in?

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

thanks
 

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

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