Methods to Spread the Load on 1st Floor

Postby music_room_justin » Thu Oct 11, 2018 6:57 pm

Hi DIY Folks

I hope someone can help suggest some good solutions here.
I recently moved into residential accommodation, a 1 bedroom flat that is situated on the 1st floor of a 2 flat unit (1 bed flat upstairs, 1 bed flat downstairs). Otherwise the property is detached.

Now that I have moved in I would like to reconstruct an isolation booth made from lightweight materials (timber, dry lining and mass loaded vinyl).
The booth potentially weighs as much as 1200 kg with a 6 x 6.6 foot floating floor.

The room I would like to reconstruct the booth in, has a floor area of 9 ft x 12 ft.

I figured that if I rebuilt the booth on the existing floating floor, the pressure per square foot would be higher than recommended.

In the UK, I have read a document authored in 1996 that states the min spec of British Standards for the min load capacity for imposed floors in residential buildings including in the bedroom.

The min load capacities are listed as follows.
Uniformity distributed load kN/m2: 1.5 kN/m2
Concentrated load kN: 1.8 kN/m2

Now presently the isolation booth has a floating floor of 6.6 foot (2.032m) x 6 foot (1.82m) and an area of 39 square foot (3.714 m2)

I estimate the isolation booths weight at approx. 1200 kg including floor
So I calculated the load of booth as it is @ 1200/3.714 = 323.10 kg / m2
translated to imperial
2545 lbs / 39 = 67.8

Which in both cases is too high
However, I do note that once the booth is reconstructed, it will not move.
So perhaps should be treated more like a dead load rather than a live load.

Now, I was wondering what the solution was to this problem, as I would still like to rebuild the room.

I was thinking that if I were to rebuild the floating floor to span the entire are of the floor (which is 9 ft x 12 ft or 2.74 m x 3.65 m)
Then I would be able to distribute the load of the weight of the booth
more evenly across the entire area of the floor, rather than on one particular area.

If done so.
I calculate crudely the following: the area of the entire floor is as follows:

12 ft (3.65m) x 9 ft (2.74m) = 108 ft 2 (10.001 m2)

1200 kg / 10.001 m2 = 119.98 kg/m2
2545 lbs / 108 ft 2 = 23.56 lbs/ft 2

I also have read that if I were to build a dunnage platform (raised floor made from joists of some form with floor covering on top) to distribute the weight evenly, and placed the frame for the dunnage over the joists in the floor, then it is possible that I would be able to increase the load capacity even further as a safety precaution.

If anyone out there has any experience or knowledge on this subject, I would most definitely be grateful for your advice.
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DIY asbestos test kits

Postby collectors » Sun Oct 14, 2018 2:23 pm

I would imagine that whatever you do with this type of work you will need all neighbors in agreement with a party wall agreements in place & if there is a freeholder, their permission as well, structural drawings & calculations that would be agreed by your local building inspector.
If you didn't, you would be in deep dodo when dealing with things at well over a ton plus in weight & somthing goes wrong.
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Postby music_room_justin » Sun Oct 14, 2018 9:59 pm

Thanks for your reply.

I believe when it comes to floor load capacity, I don't believe there are laws that forbid people placing a load on the floor of the flat they are renting, if the load is within the range.

I believe that in rented accommodation, unless specifically stated in the tenancy agreement, then also, this would likely be a grey area if the weight that is brought into the property is within the limits and is free standing.

However, in my case, as i am a nice chap. I would prefer to be considerate but also be sure using accurate structural engineering to make sure, so as to eliminate any danger of risk to the inhabitants of my own property or the floor below, as well as to eliminate any risk of any damage to the buildings structure itself.

I believe the load which I propose to construct in place is under the max (min spec) limits, and thus would not cause damage.

Where you may think that the weight is a great deal, if you were to weight the amount of weight that was placed on your own properties floor, you may be surprised that at times you may also be placing as much pressure in weight or even more at times.

For example.
Parties where lots of people congregate or even dance.
Dinner parties
Home gyms
Home aquariums
Home Library
Home Data centres
Heavy duty filing cabinets

All the above would likely place more of a load on a properties floor, as well as put more of a dynamic strain on the structure of a property due to the live nature of the load (as the load in many of the above examples are live, so move around and place pressure in many directions over time).

Still, thanks for your help.
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