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Dec 14th, 2018, 10:11am
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water damaged joists — are they ok? (Read 378 times)
woodsmith
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Re: water damaged joists — are they ok?
Reply #4 - Jun 14th, 2018, 9:19am
 
If they are that bad then sadly they need replacing.
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Re: water damaged joists — are they ok?
Reply #3 - Jun 13th, 2018, 1:37pm
 
Thanks for the replies! The joists are 2 m long and the rot starts halfway and goes to one end. The rot penetrates about 1/4 of the way in from both the top and thre bottom (that much just rubs off when you scrape it).

We could bolt another joist to the side but the problem is how to fix it at the end since the rot goes all the way to the wall.
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woodsmith
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Re: water damaged joists — are they ok?
Reply #2 - Jun 13th, 2018, 8:49am
 
It would be good to let the joists dry out as much as possible while it's all exposed, at least the weather is on your side.

Difficult to tell water damage from a photo. Try sticking a thin screwdriver or knife into the wood, if it only goes in a short distance then the damage is superficial. You could also try tapping the wood with a hammer. Rotten wood sounds dull and you can see the damage the hammer does, sound wood has more of a ring and you should get no damage.

So if the wood is generally sound and the uneven top surface is the only problem I would get some 100 by 50mm timber and screw (use timber fixing or construction screws for this) or bolt this to the existing joists the full length of the joist. This will give a bit of support to the joists and a flat even surface on which to fit the floor.

Hope that helps.
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thescruff
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Re: water damaged joists — are they ok?
Reply #1 - Jun 13th, 2018, 8:43am
 
What size are the joists? it's difficult to say from the pics.

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water damaged joists — are they ok?
Jun 12th, 2018, 6:55pm
 
Our house’s previous owners had a long term leak in the bathroom that did some damage to the joists under the bath. They are still damp to the touch although the bathroom hasnt been used for a week. The damage is clear but not TERRIBLE. Does anything need doing to them or can we just put new boards over the top?

Thanks for your advice!

...

Here you can see a healthy joist at the bottom for comparison:

...
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