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Carpentry & Joinery

Joist too close to internal wall

Anonymous user 03/03/2024 - 3.15 PM

We recently moved into a house that has damp issues mainly on the cable end. On investigation we have found that the end joist is running right up against the internal wall. The end of the joist is up against the outer brick and the joist is sat on a wet ledge. There is a lot of rubble causing bridging but the main question is, how easy is it to replace the joist to move it away from the wall. When we first moved in we were over whelmed with the work and received conflicting advice from tradesmen when we asked for quotes. I eventually got back to our surveyor to ask advice which we are following, but unfortunately in between we had someone to do some work. We are very wary of making the same mistake as the work will have to be redone. The room looks like it has had a DPC injection, but because of the bridging rubble has not worked so we have been recommended to address the damp issue the traditional way, which we started, then found the rogue joist. Any advice would be greatly received. The house was built in 1960. Thank you for your advice. The joist turned out to finish on a sub wall , had no damp proof underneath it and was wet and rotten. We have got a new treated one and will follow your advice with protecting the end. We are slowly working along the wall, removing bricks to remove bridged rubble and replacing the damp course as we go. We are doing this internally because of the weather. If this sorts out the damp we will have the walls pointed in better weather. Cheers again Ken

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1 Answer

Mcculloch Builders & Joinery

Rating: 4 out of 5
Selby
Hi Ken, A slightly tricky one with the lack of info i need such as the age of the house, any exterior bridging issues etc but i gather the house may be between 1900/1950 because of the rubble in the cavity causing the bridging. If the property has a dampcourse it is usually visible from outside as a thin black line (bitumen). Your floor joist will be sat on the dampcourse where a half brick will be left out to seat it. If it is rotten you need to cut back rotten joist at least 300mm into the good wood replace it with at least a 1.5 metre length of new joist, (treated timber) and wrap the end with a physical damp course just to extend the life span. The additional joist will need to be bolted (not screwed) to existing joist and the half brick taken out and moved to opposite side. If there's a sleeper wall supporting the floor joist within reach, try to support it on that, you might have enough crawl space but like i said, info is a bit thin.. Hope i've been of some help Andy
Answered3 January 2017
1