Loft floor joists questions for storage and model railway
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Rooftop
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Loft floor joists questions for storage and model railway

by Rooftop » Mon Aug 01, 2022 5:52 pm

Hi

Have a 6 x 7m loft space currently with 4” x 2” ceiling joists

Looking to have access for storage and a model railing way setup and maybe a desk to use from time to time

Which option is best

1) add new joists in parallel with existing from wall plate to wall plate with load bearing walls in middle (2.4m joists joined with M12 + joist connectors) 18mm OSB board for flooring which size C16 could I get away with?

2) add another 2-4” on the existing ceiling joists (at 90 deg angle on existing) with 18mm osb flooring

Thanks in advance

stoneyboy
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Re: Loft floor joists questions for storage and model railway

by stoneyboy » Fri Aug 05, 2022 10:48 pm

Hi rooftop,
For option 1 you would probably have to use 47x120 joists, the biggest problem would be re-routing pipes and cables and any insulation. Option 2 has its attractions because none of the relocating/re-routing would be necessary but you may have to use fixings at every cross over. You would need to take the advice of a structural engineer to check whether either are sound proposals.
Regards S

Rooftop
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Re: Loft floor joists questions for storage and model railway

by Rooftop » Sat Aug 13, 2022 1:29 pm

Thanks for that.

Excuse the silly question but which should the new flooring joists go?

https://freeimage.host/i/UpnWqQ

Orange or green?

Chimney breast has been removed and is on the right of the picture (party wall)

stoneyboy
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Re: Loft floor joists questions for storage and model railway

by stoneyboy » Sat Aug 13, 2022 11:21 pm

Hi rooftop,
If you are going for option 1 then the green or option 2 the orange.
Regards S

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