Hi
I am one day into have a loft conversion completed on a modern trust rafter house by a specialist loft conversion company. They ran into a few problems, which they are doing there best to sort out, but it lead to be to have a good look at he work completed so far.
I have a couple of concerns about the steel trimmers they have put as the new supporting members across the width of the house. One of the steels (I beam) is 30cm high and 6 meters long. One end is supported on an internal load bearing wall and that looks fine, but the other end is supported on the external wall.
The 'stack' goes like this: I beam 300mm high, 6 meters long, cut at
45 degrees (to fit under tiles); 30mm thick, 100mm wide, 400mm long steel plate; 60mm thick, 100mm wide, 400mm long new timber member (to raise height); existing wall plate (I assume as I can't see). The concern is that the overlap of the I beam onto the steel spreader plate is only 50mm. The architects drawing shows a square ended beam (ie not cut at 45 deg) sitting a full 100mm on to the steel plate.I also believe there should be a 25mm gap between the steel and the existing timber ceiling joists - is that right? If so I have less than 10mm - the builder said no, that is only between the new floor joists and old ceiling.
Should I be worried? What is the building inspector going to say about A) the overlap and B) the use of timber in the 'stack' C) the lack of gap?
Thanks in advance Kev