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Old 12-23-2011, 12:10 AM   #1
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floor joist going through party wall


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 ?

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Old 12-23-2011, 06:09 AM   #2
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floor joist going through party wall


Only a person on site could answer that---That's some major structural changes to an old building.

Have you considered sound deadening insulation?

Post a picture if you can--Mike--

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Old 12-23-2011, 06:36 AM   #3
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I don't think that will stop any vibrations or dampening.

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Old 12-24-2011, 03:56 AM   #4
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The trouble is the sound is traveling along the joist when their kids jump my floor vibrates so I wanted to seperate my joist from theirs then sound proof the walls
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Old 12-24-2011, 06:34 AM   #5
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Only someone on site can answer this one---hire an architect or engineer--Those old places are often built differently than todays structures--

You could be opening a can of worms---
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Old 12-24-2011, 06:41 AM   #6
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And when you mess with party walls inspectors start really getting concerned as you can put others in jeopardy as well as yourself. Especially fire codes.
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Old 12-24-2011, 09:17 AM   #7
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floor joist going through party wall


it is a non-load bearing wall if it only 1 brick thick. You can't cut the joist without bringing down both structures.
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Old 12-24-2011, 09:28 AM   #8
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floor joist going through party wall


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.
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Old 12-24-2011, 11:54 AM   #9
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floor joist going through party wall


Where are you located?Is it the typical UK 30's semi? When you say 1 brick thick, do you mean 9 inches thick?
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Old 12-24-2011, 06:21 PM   #10
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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
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Old 12-24-2011, 06:22 PM   #11
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Merry Christmas by the way ;-)
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Old 12-26-2011, 05:55 AM   #12
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floor joist going through party wall


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.
floor joist going through party wall-php5patpham.jpg
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Old 12-26-2011, 08:40 AM   #13
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Hmmm that's interesting the noise is definitely coming along the joist tho I can feel the vibrations is their any other way to cure this
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Old 12-26-2011, 08:48 AM   #14
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floor joist going through party wall


The joists could be touching each other as they are laid side by side.
Is it the ground floor? You could check the holes where the joists sit are fully filled. If not use some expanding filler.
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Old 12-26-2011, 09:35 AM   #15
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Yes its the ground floor the other idea I had was to put some perforated ally channel screwed between joist and pack with rockwool then build a false wall in each alcove

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