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28-04-2019, 15:06   #1
sam ford
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Attic flooring,

Hello, Going to fit tongue and groove board in the attic, ( 8ft x 2ft OSB board 18mm) what size/type of screw needed to fit these, thanks in advance,
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28-04-2019, 15:31   #2
tabby aspreme
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4/40mm screws, and drill a 4 mm hole in the OSB for each screw
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29-04-2019, 10:38   #3
recipio
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Hello, Going to fit tongue and groove board in the attic, ( 8ft x 2ft OSB board 18mm) what size/type of screw needed to fit these, thanks in advance,
Use a countersink drill bit for neatness.
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30-04-2019, 22:22   #4
sam ford
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thanks for the advice
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03-11-2019, 20:16   #5
irishproduce
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Looking at this thread as might attempt same.

What is the best advice on insulating below the the t&g boards?
There is small section of the attic that has this thick grey foam about 100mm with boards on top of it but that was done a decade ago by attic insulation company.

Is it ok to lay normal osb board over the rockwool insulation between joists I want to cover on this project?
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04-11-2019, 09:10   #6
dathi
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Looking at this thread as might attempt same.

What is the best advice on insulating below the the t&g boards?
There is small section of the attic that has this thick grey foam about 100mm with boards on top of it but that was done a decade ago by attic insulation company.

Is it ok to lay normal osb board over the rockwool insulation between joists I want to cover on this project?
the boards with the 100mm insulation attached are probably a walkway to your cold water storage tank , part l of the building regulations TGDS require a U value of 0.16 which equates to 300mm of rock wool /fibre glass type insulation . this means that you have to put a layer of insulation above the joists and use either loft legs https://www.toolstation.com/loft-flooring-legs/p44016 or use a second joist running perpendicular to the ones that are already there, before you put your new flooring down
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04-11-2019, 19:51   #7
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Thanks Daithi, I am not too concerned with building regulations and that. I am only doing it in my own attic. Would think that's exempt from regulations no?

Would the rolls of wool insulation deflate / depress over time if left under a few sheets of OSB board? Is there a reason the hard grey stuff was used by the insulation company years ago?
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05-11-2019, 10:37   #8
dathi
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Thanks Daithi, I am not too concerned with building regulations and that. I am only doing it in my own attic. Would think that's exempt from regulations no?

Would the rolls of wool insulation deflate / depress over time if left under a few sheets of OSB board? Is there a reason the hard grey stuff was used by the insulation company years ago?
1 no . no one is exempt from the building regulations as they are backed by statutory instruments ie. they are law of the land. it doesn't matter if you do the work yourself or hire someone you still need to comply
2 as i said in first post the "hard grey stuff" is used as walkway to cold water storage tank
taken from partL building regulations TGD appendix b

Providing for access to tanks, services
and fittings in the roofspace
Because the depth of insulation will obscure
the location of ceiling joists, provision should
be made for access from the access hatch to
the cold water tank and to other fittings to
which access for occasional maintenance
and servicing may be required. This can be
done by provision of walkways without
compressing the installed insulation or by the
use of high density insulation under the
walkway or by installing composite attic
boards.
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