+100 also my main gripe is that I wish I had insulated my floors MORE
In windy weather they lose a LOT of heat despite 2" of polystyrene.
So if anyone is laying a slab, or redoing floors, insulate to the max. You wont regret it.
+100 also my main gripe is that I wish I had insulated my floors MORE
In windy weather they lose a LOT of heat despite 2" of polystyrene.
So if anyone is laying a slab, or redoing floors, insulate to the max. You wont regret it.
So you went for Jablite then? They say it's a minimal fire risk on the ground floor
Rockwool slabs are less messy than the rolls. 1200x600 but as easy to cut as Celotex
It certainly is under 5 " of screed and with a further 6" of concrete underneath ;-)
Sadly I was required to have a suspended CONCRETE floor,. which is OK but why they insisted it be VENTED is beyond me.
It came in handy though to make vents for the solid fuelled fires and the aga tho :-)
But I suspect the heat calcs were done on the basis of a solid slab: with venting it wasn't enough.Some parts of the floor are distinctly icy near where the outside vents are.
Not very effective when not in a sealed cavity with lots of 'stagnant air' though.
Got that in my walls, till I closed all the cracks, walls were icy. Stopping airflow was the key to making it work.
Slabs over air are a bastard - had a flat with the car port under my floor and 2" (guess) of polystyrene was still useless.
However, my current floors on slabs on earth with zero ventilation aren't that bad - 12-20mm marmox on top in the bedrooms and bathroom leave a most satisfactory floor that you can lie on in complete comfort.
In article , geraldthehamster writes
Um, that's exactly what I said.
We were in the same situation and I didn't put celotex under the floor; I wish I had done. We did fill the gaps between the floorboards using a V section platic strip designed for the purpose. That helped a lot.
My advice: do a proper insulation job between the joists and leave the ventilation under there alone. Remember to get building control approval (it's covered by Part L).
Robert
For the OP's situtaion it will need to be about 100mm thick to meet building regs. The required thickness depends on the (exposed perimiter)/area of the floor. take a look here:
Fllorboard gap filler we used was called "gapseal" and it worked well.
Robert
Sod that
Seconded. Celotex is expensive enough without unnecessary fees.
Cheers Richard
That's pointing to Kingspan Thermafloor which is polystyrene, PIR foam thickness should be about half of that for the same thermal properties so say 50mm.
In article , RobertL writes
There is no requirement to gain approval for additional insulation where there is no change to the structure.
The reason to elevate timber floors is to avoid damp from the ground. Timber floors laid straight on ground, only occasionally encountered, tend to rot.
NT
Approved Document L1B, 5.7 b. i. defines the replacement of an existing layer as "stripping down the element to expose the basic structural components (brick/blockwork, timber/metal frame, joists, rafters, etc)..."
So I guess if you take up the floorboards, strictly speaking it's notifiable. I wouldn't bother, and I bet nobody has.
Cheers Richard
Agreed, thanks for pointing out the exact wording that makes it far clearer.
When I did mine I worked below from an existing hatch but in one area had to lift a few board to do the poke fill method which (even if I was bothered) shouldn't have required a notice.
Although it's been suggested here, I wouldn't lift all the boards, vapour barrier considerations or not.
It's wise to take care if there is a compliance bod in the vicinity.
Not only that, but once the BCO is involved it has to be to latest spec, or not at all.
He has no wriggle room for you to say 'but this is at least better than it was'
This is a glaring problem for people trying to save power.
That depends on whether you call adding insulation a 'material change' or not.
Since insulation is fully covered in the regulations, it would seem likely that it is so considered.
but who can say if that is from upwards moisture from the ground, or downwards condensing ON the ground?
Hasn't it to be more than 25% of the element to be notifiable? You did some last year and some the year before etc. didn't you?
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