We are in the process of converting our attached garage, roughly 5.5 x 5.5m, into living accommodation (two floors).
The ground floor level in the garage needs to be raised by 420mm to bring it in line with the house. The existing garage floor is a 200mm reinforced concrete slab.
We intended to put a DPM on the existing slab, then 100mm PIR insulation, then vapour barrier, then 320mm of concrete.
Building control officer came today and said we should use a reinforced screed instead because we already have a concrete slab in place. I said it would have to be pretty thick screed and he thought it wouldn't be a problem if it was reinforced.
I've considered a block and beam floor but we've already been told we can build the new inside leaf for the cavity wall straight off the existing slab. I don't really want to concentrate ground floor loading around the perimeter and prefer the idea of distributing the additional load by keeping a solid floor construction. Plus I'd possibly need to build dwarf walls for the long span and I'd have to ventilate the void.
So options I've considered are:
What do you think is the best way to make up the 420mm height needed?
The ground floor level in the garage needs to be raised by 420mm to bring it in line with the house. The existing garage floor is a 200mm reinforced concrete slab.
We intended to put a DPM on the existing slab, then 100mm PIR insulation, then vapour barrier, then 320mm of concrete.
Building control officer came today and said we should use a reinforced screed instead because we already have a concrete slab in place. I said it would have to be pretty thick screed and he thought it wouldn't be a problem if it was reinforced.
I've considered a block and beam floor but we've already been told we can build the new inside leaf for the cavity wall straight off the existing slab. I don't really want to concentrate ground floor loading around the perimeter and prefer the idea of distributing the additional load by keeping a solid floor construction. Plus I'd possibly need to build dwarf walls for the long span and I'd have to ventilate the void.
So options I've considered are:
- Buying more insulation and going with 200mm rigid insulation + 220mm reinforced screed.
- Sticking with 100mm insulation and 320mm concrete on top.
- Going with some kind of suspended floor like block and beam.
What do you think is the best way to make up the 420mm height needed?