Enlarging a loft opening Re-generate an old or tired space and give it a fresh breath of life. Click here for answers, information and tips

[Lawrence]

I want to increase a loft opening to approx. 1000mm x 700mm.
This will invlove cutting across anther joist

Are there any regs I need to follow in constructing a trap door e.g. can it be made out of 18mm plywood or dioes it need to be specially treated fire retardant material? Does it need insulation as well?

Thanks