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Would I lose much height using TJI's? Could I not put a rsj through centre and use normal/smaller joists

What causes thermal contraction and is a helical repair necessary? What would happen if left, seems strange up and downstairs windows have been replaced front and back and they all have a crack under each window..

I plan to have a double garage extension made that was 6metre in length with rooms above. I then changed to a 7metre extension as I had the room and I'm told I need to use TJI joists now because of the additional span and this will mean slightly lower ceiling height in garage.. Is this...

I had some work done by builders on my garage conversion and the floor raised with insulation and concrete. Problem being its not perfectly level. :x Whats the best way to resolve this for laying flooring. Should I use self levelling compound?

Not on one of them the others are covered in tyrolean/render outside.. What could have caused these and whats the best way to treat them can I just plaster over them or will they crack again? I also have a small crack running up a wall in the front room, from bottom to top, very narrow on...

I have just bought a new house and I'm renovating it, under three of the windows are cracks, the windows have been replaced fairly recently, prior to me buying the property... Are these any cause for concern?