Everyone was so helpful with our question about roof insulation, so I wondered if you might be able to help regarding underfloor heating in our extension please?
We are extending the room that will be our kitchen, so we are trying to marry up the new materials (and building regs standards) of the new extension with the breathability required in the old part. We are planning to take up the floor in the old part (flagstones), so that we can insulate below and fit underfloor heating throughout the whole extension.
Essentially, we’re not sure about what materials to use in the old part. In the new part we plan to lay hardcore, dpm, concrete, insulation, UFH pipe work, screed then flagstones. In the old part we are limited on space due to foundation depth, so can we omit the hardcore layer? We can then use limecrete and breathable insulation/screed, but do we just omit the (non-breathable) dpm too?
Will there be any issues at the join between the old and new parts? For example, could the concrete and dpm of the new extension disperse water and cause damp in the old floor? If so, would we be better using the same flooring buildup in the new extension too?
Thanks again
We are extending the room that will be our kitchen, so we are trying to marry up the new materials (and building regs standards) of the new extension with the breathability required in the old part. We are planning to take up the floor in the old part (flagstones), so that we can insulate below and fit underfloor heating throughout the whole extension.
Essentially, we’re not sure about what materials to use in the old part. In the new part we plan to lay hardcore, dpm, concrete, insulation, UFH pipe work, screed then flagstones. In the old part we are limited on space due to foundation depth, so can we omit the hardcore layer? We can then use limecrete and breathable insulation/screed, but do we just omit the (non-breathable) dpm too?
Will there be any issues at the join between the old and new parts? For example, could the concrete and dpm of the new extension disperse water and cause damp in the old floor? If so, would we be better using the same flooring buildup in the new extension too?
Thanks again