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- 1 Oct 2006
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Hi all, and thanks in advance for your time.
I am planning a garage conversion, and need to raise the floor by 150mm. The floor is concrete at the moment, and is in good condition and flat.
My original plan was to simply lay 5*2 joists on the floor, on top of a DPM and then put chipboard/ply on top (insulation boards between joists). I was advised against this as it will restrict air flow underneath the floor.
I then moved to the idea of a suspended floor. I was going to use 4*2 joists with a chipboard/ply covering. To cover the 4.5m span I was going to support the joists. This would give me 25mm under the joists to run any cables & pipes I might need. Again I was going to insulate beween joists.
On another post in the building forum I saw this:
http://www.planningportal.gov.uk/uploads/br/BR_PDFs_ADC_2004.pdf
Which on p27 shows a diagram for a suspended floor which must be at least 150mm abovethe subfloor. This suggests to me you cannot use a suspended floor if you are only raising the level by 150mm.
I think, realistically, I don't want to get into laying the new floor as a new concrete slab- so what alternatives do I have? Someone has suggested building it up with insulation boards but they recommended checking on here.
I am planning a garage conversion, and need to raise the floor by 150mm. The floor is concrete at the moment, and is in good condition and flat.
My original plan was to simply lay 5*2 joists on the floor, on top of a DPM and then put chipboard/ply on top (insulation boards between joists). I was advised against this as it will restrict air flow underneath the floor.
I then moved to the idea of a suspended floor. I was going to use 4*2 joists with a chipboard/ply covering. To cover the 4.5m span I was going to support the joists. This would give me 25mm under the joists to run any cables & pipes I might need. Again I was going to insulate beween joists.
On another post in the building forum I saw this:
http://www.planningportal.gov.uk/uploads/br/BR_PDFs_ADC_2004.pdf
Which on p27 shows a diagram for a suspended floor which must be at least 150mm abovethe subfloor. This suggests to me you cannot use a suspended floor if you are only raising the level by 150mm.
I think, realistically, I don't want to get into laying the new floor as a new concrete slab- so what alternatives do I have? Someone has suggested building it up with insulation boards but they recommended checking on here.