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Dear all, Is there an overlay floor insulation for draughty, suspended timber, ground floor. The floor has breathing bricks. I understand getting the floorboards out and putting nets and celotex/PIR/PUR boards in between the joists is probably the best solution but getting the floor boards out...

Thanks John! This may be just in my mind. I have used 18mm WBP exterior grade hardwood ply for flooring (screwed directly to joists) to replace old split floorboards. For some reason I thought I made a mistake I should have used 24mm instead. Is 18mm strong enough? Here is more information...

Any suggestions please?

Thanks!

Apart from knocking off and additional internal wall my suggestion is not different from the OPs original plan. I have just put it systematically. Op's proposed layout has one wall knocked off already.If the other wall is structural then it may get bit expensive. If it is a partition wall then...

Thanks. We have put a couple of drywall screws to hold and the big long sheet seems to be holding up for now. Plaster boarding will happen Today.

Is earthwool 100mm enough?

Thanks! And yes, I am yet to buy presents !!! Talk about procrastination.

Sorry, I have a different view. Where I live 2 up 2 down houses, with kitchen and first floor rear extension, are configured as: 1) 2 bedrooms with first floor bathroom 2) 3 bedrooms on first floor and bathroom behind kitchen on ground floor 3) 4 bedrooms: 3 bedrooms like option2 and...

Quick question, if I add another 6-12mm ply to existing 18mm subfloor will it have any strengthening effect? The idea is to stain the top ply with a desired wood stain and seal it will polyurathene(3 coats) or tung oil(multiple coats) and avoid installing any other floor covering. Some ply...

Thanks woody! Is there an insulation thickness threshold for plastic screw requirement?

Dear all, hope you are looking forward to the festive days. The said bedroom is on top of kitchen with two external walls and a pitched roof. External walls are well insulated(celotex) and there is a total of 300mm(100mm + 200mm) earth wool ceiling insulation. I was told that warm air always...

Thanks. Yes, I have used the black phosphate coated drywall screws for normal plasterboards. Can they be used while penetrating through the insulated board? I read somewhere that you have to use plastic screws to avoid cold/thermal bridging. Is that true?

Thanks chappers. I did not quite get how I will hold the celotex board under the ceiling joists? Do I screw up the celotex boards to the joists first(just enough screws to hold) and then screw plasterboard on top with usual 15 -20cm between two screws?

Thanks tomfe and woody!!! Will 150mm screws be good and do they need to be any specific type or normal dry wall screws are OK?

Anyone please ...

Ah, thanks!!!

Dear all, this forum is a treasure for me. Saving a fortune on many works. I have a good amount of plasterboard and 100m celotex left over. Can I use some adhesive to stick celotex to a plasterboard and screw(insulation + PB) them under the rafters of one of the sloping ceilings that I have. 1)...

Thanks John. Is c24 not good enough?

In case anyone is reading this thread, we went with 18mm ply - https://www.selcobw.com/general-purpose-plywood-2440-x-1220x18mm-b-bb-ce2-e1-en636-2. The title says General purpose but the overview says it confirms to structural panel standard(EN13986) I will look for vinyl/laminate as a floor...