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 Post subject: Loft Joist diagram
PostPosted: Wed May 17, 2017 1:34 pm 
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Hello there, I've had some good advice on this forum regarding some rotten joists, so I wondered if you might be able to advise on how best to strengthen my loft joists.

I've taken the ceiling down in a bedroom due to the lath and plaster caving in. Before boarding and skimming I'd like to strengthen the loft joists for boarding and storage. The joists are currently 3*2 and span about 3.5m.

After reading other forums I was thinking about screwing and gluing additional 4*2s along their length but there's a 3*2 brace running at 90 degrees along their top mid span (current joists shown in red). Is it safe to remove this brace and screw and glue as planned (green)? I had thought about putting additional 3*2s on each wall and spanning over the brace (orange) but due to the pitch of the roof, the new joists wouldn't quite reach the far/window wall and would therefore be resting on the original 3*2s.

I would rather go with the 'green' option if it's safe to do so. Thanks in advance for any advice!


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 Post subject: Re: Loft Joist diagram
PostPosted: Fri May 19, 2017 9:17 am 
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Whist waiting for a Pro to advise, I have only ever seen strengthening done by sistering, side by side and not ontop.



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 Post subject: Re: Loft Joist diagram
PostPosted: Fri May 19, 2017 9:59 am 
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Considering the span of 3.5M, C16 45X120 Joist would work on their own.
You could choose to 'sister' these to the existing 3x2 or remove the old ones.
I think the use of the 45x120 C16 (either sistered or alone)would be preferable to using 4x2 sistered to the old.

davyp1



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 Post subject: Re: Loft Joist diagram
PostPosted: Fri May 19, 2017 12:36 pm 
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The brace can be removed if you're uprating the joists - although I'd recommend replacing it with a row of solid noggins - the brace is used to prevent one ceiling timber from sagging any more than any others.

My span tables say 45 X 170 for a 3.5m floor span, 47 X 120 would be fine just for a ceiling (and probably OK if you sister them with the existing) but with storage it means you have to walk on it, this could lead to cracks appearing at the p/b joints, it's unlikely to ever be anything worse than that, but just something to bear in mind.

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 Post subject: Re: Loft Joist diagram
PostPosted: Fri May 19, 2017 1:24 pm 
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Thanks for all of the advice again. I've ordered the joists for my other project - the rotten bathroom floor - now that the ceiling is down in there I think I'll be able to get them to span from wall to wall as well as bolting to the old ones.


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