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floor joist going through party wall

11K views 23 replies 8 participants last post by  damojack 
#1 ·
Hi all I have a 1930 semi with wooden floorboards downstairs and the floor joists go through the party wall (1 brick width ) and are shared with next door so a lot of sound travels can I cut these from party wall and introduce joist hangers ?
 
#8 ·
Forresth is correct, a one brick wide wall is likely not strong enough to support joist hangers, but may be adding support to the existing through joists. Cutting the joist would convert the joist from a continuous beam spanning a support to two simple beams supported by the brick wall. Totally different structural system, which would require careful engineering and of course a permit prior to installation.
 
#10 ·
Yes 9 inches thick I'm in Essex I definitely don't want to weaken the wall but what would you do if you had a rotten joist or god forbid a fire rebuild both houses so you could put joining floor joists in again so surely the wall should be strong enough don't no if this makes any difference but there is a chimney stack in each room with an alcove either side
 
#12 ·
I would be really surprised if the joists went right through the wall into next doors house. They were normally put into the wall and next doors laid along side them. Nowadays they are put on joist hangers because of fire Regs.
Joists normally take the shortest span from the party or external walls to the nearest load bearing partition wall. Single brick (4 inch thick block or brick) are used as load bearing walls.
I've never known anyone do what you propose for soundproofing, so although it can be done, I'm not sure if it would have any effect.
When you do work on party walls nowadays there is the Party Wall Act to consider with your neighbours.
Here's an example of a typical Victorian joist layout.
 
#17 ·
Lol did think bout buying them all slippers for christmas cost is not that bad I reckon I could do upstairs and downstairs for about 600 which for my own sanity it'll be worth it I only brought the house 6 months ago and plan to live here for quite a while so def wanna soundproof my house just want to do it properly
 
#18 ·
Lol did think bout buying them all slippers for christmas cost is not that bad I reckon I could do upstairs and downstairs for about 600 which for my own sanity it'll be worth it I only brought the house 6 months ago and plan to live here for quite a while so def wanna soundproof my house just want to do it properly
You mean 600 pounds.....right?

Let me guess....used to be council housing?.....and they sold the units?

I lived in the UK for a couple of years....the x is from Scotland....this wife from Preston....you should have seen her grandparents house....
 
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