Hi, Wonder if anyone can offer any advice.
Doing a loft conversion, and have all the structural calcs. We have a span of 4.3m and the structural eng. has specified 50 x 200. The floor is down, and was put in by a builder. The floor was to span a single storey extension with a flat roof, the floor was to be put above the ground floor ceiling. Unfortunately the builder took the roofing felt off to build up the exterior brickwork, and the heavens opened, bringing down the ground floor ceiling. To cut a long story sort, we decided to remove the roof off the extension, and the builder took the decision to use the loft timbers of 50x200 as the upstairs floor, and downstairs ceiling without checking with structural eng. The Building Inspector has passed this and work commennced. The Building Inspectors change on a regular basis, and we do not get continuity hence not sure if it is ok.
The questions I have are:-
Are the joists adequate to deal with this span, bearing in mind it is the floor and ground floor ceiling? They are on joist hangers on one side, and built into the outside wall on the otherside, with noggins down the centre, and on either side of centre to brace the floor. Builder says it is fine.
and
To make matters worse, when we have measured the joists exactly, they are actually 47 x195. It appears he has ordered 50x200, but this is what has been supplied, and he has used them.
Floors are down, and the ceilings have been plastered downstairs, but the floor is "slightly springy". Could anyone advise me what to do please as I am worried that the floor will not be strong enough to cope.
Any advice would be appreciated.
The structural eng. has retired, and we cannot get hold of him anymore, which is why I am asking the questions, I suppose I could employ another structural engineer, but if in the meantime, any advice could be given on this site would be gratefully received.
Doing a loft conversion, and have all the structural calcs. We have a span of 4.3m and the structural eng. has specified 50 x 200. The floor is down, and was put in by a builder. The floor was to span a single storey extension with a flat roof, the floor was to be put above the ground floor ceiling. Unfortunately the builder took the roofing felt off to build up the exterior brickwork, and the heavens opened, bringing down the ground floor ceiling. To cut a long story sort, we decided to remove the roof off the extension, and the builder took the decision to use the loft timbers of 50x200 as the upstairs floor, and downstairs ceiling without checking with structural eng. The Building Inspector has passed this and work commennced. The Building Inspectors change on a regular basis, and we do not get continuity hence not sure if it is ok.
The questions I have are:-
Are the joists adequate to deal with this span, bearing in mind it is the floor and ground floor ceiling? They are on joist hangers on one side, and built into the outside wall on the otherside, with noggins down the centre, and on either side of centre to brace the floor. Builder says it is fine.
and
To make matters worse, when we have measured the joists exactly, they are actually 47 x195. It appears he has ordered 50x200, but this is what has been supplied, and he has used them.
Floors are down, and the ceilings have been plastered downstairs, but the floor is "slightly springy". Could anyone advise me what to do please as I am worried that the floor will not be strong enough to cope.
Any advice would be appreciated.
The structural eng. has retired, and we cannot get hold of him anymore, which is why I am asking the questions, I suppose I could employ another structural engineer, but if in the meantime, any advice could be given on this site would be gratefully received.