Vibration in floor - Victorian property

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Hi All,

I was wondering if someone could provide some advice for me on a few things:

I have an upstairs floor which when walked across seems to cause vibrations across the room, so it causes minor shake on the top of furniture, eg tv screen wobbles slightly or oranments wobble slightly. Nothing falling over etc.

Building was constructed approx 1860, floor is large approx 6.3x4.5m, carpeted with plywood underneath (assume for levelling) and original floorboards under that.

I assume fix for this is to take floor up, check beams, check where they go into the wall and assess whether sister beams need adding or additional beams etc?

On top of this we have another slight issue,

When we have had strong winds, above 40mph for extended periods occasionally our floor will vibrate then as well. To give context, we have a large conservatory attached to this part of the building which then goes into an extended part (a flat roof timber extension, but seems to be brick at the ground floor level) and this is supported by steel supports which from where they are placed I assume connect to the master bedroom (the vibrating room).

The conservatory seems to be the indicator of vibrations as when that is hit by the wind, we get these vibrations. So in the recent 80mph winds we had this happen quite often, but at other points, more recent wind 20-30mph we have no signs of it.

Finally, we had two upvc french doors fitted to replace two very old ones again on the same part of the building, headed into the conservatory. It would seem when the door which is fitted into the flat roof extension is closed 'harder than normal' - it too causes some minor vibration in the floor.

We moved in last summer and had a full structural survey done, none of this was found and the general consensus was the property was in sound structural order. There are no cracks or damage around the property indicating any issues, the only 'damage' on the conservatory after the winter was some slight expansion of silicone where it meets the property, which was simple enough to remove/ fill in. Internally no damage or large cracks to the conservatory.

I can provide pictures if helpful as well.

Any recommendations on how to work this one out and any trades that might be useful to have come and assess it?

Thanks.
 
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Did it used to be a back to back terrace and now has 1 set of stairs taken out?

Because I have similar issues due to this, I think its mainly because the joists are now hung from a new (well not 100+ year old) joist that runs across the room where the wall used to be.
May be best to lift the flooring at the edges if you can.
 
It would be useful to see how these areas of concern relate to each other?
So pics of each area of concern would be useful. eg. show a pic of the whole gable.

Roughly speaking there are say three common causes of movement in suspended floors:
1. joist section too small.
2. joist span too wide.
3. joist bearing seats loose or rotten.

use search facility to find "Vibrating Floors".
 
Did it used to be a back to back terrace and now has 1 set of stairs taken out?

Because I have similar issues due to this, I think its mainly because the joists are now hung from a new (well not 100+ year old) joist that runs across the room where the wall used to be.
May be best to lift the flooring at the edges if you can.

No - not a terrace, but a property which has changed significantly over time, including lots of additional water pipes/ electrical work done underneath the floors (particularly where there is more bounce in the room I feel).

Additionally, I do believe the staircase was at one point moved - again, I guess can cause this sort of issue.

I guess what I am asking is:

- is this a structural concern? (did not show up in the full structural survey I had done)
- who should I get round to check it over once we are able to
- by the looks of it, joists are likely going to need replacing but not 100% until checked etc, would ceiling below need to come down to do this?
 
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Mine has been bouncy for probably 30 years...
Why do you think the joists are going to need replacing? you cannot tell this until you get the floorboards up and have a good look, get the ones by the edge of the walls up to look at how structurally sound they join is, are they slotted in the wall or on hangers etc. then post photo's and these guys will advise.

Until then blue tack under ornaments helps stop the annoying wobble. :)
 

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