Barn ceiling

27 Jul 2020
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United Kingdom
I’m trying to fit a barn ceiling For an office but have come a cropper.

I want to fit plasterboard between rafters but because I have installed celotex between them I have nothing to attach the boards to. My suggested option is to build a framework inside the rafters with timber.

1. would this be ok?
2. What type and size of timber do I need.

If the framework was a ladder shape it could be screwed to the joists and to the purlins at 600s. The ridge end has no ridge showing so would need to be self supporting.

As it’s a 250 year old barn your standard measurements go out the window as the gaps are not equal, the noggins would be at about 95 intervals mostly as they would be the purlins

Any ideas appreciated

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roof lats screwed to the exisitng timbers would be sufficient to screw boards to. but you would probably need some 3x2" noggins to reduce sagging.
Thanks for the advice, I have some 3x2 and some 4x2 so will combine to fix to rafters and purlins. I can lay them flat so I get more surface area to screw boards to and more depth between the rafters. I just need it to be solid and safe I guess.
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2" x 1" batten and fix minimum 12.5mm boards and skim. Use fire rated boards if you want a stiffer ceiling or drop in a few 2"x 2" noggs.

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