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I bought a thermometer a few weeks ago and could see in the morning the heat loss is excessive, down from room temp to as low as 6 degrees!! So there's some severe heat loss and not enough insulation as I always knew.
I've thought about covering the floor in extra carpet/rugs but that won't solve it. Wall thermal liners won't really make much difference as its only 4mm thick.
If I was to redo the insulation I have thought about a few things. After speaking to my uncle who does a bit of DIY stuff he said to look at the U-value rating on it, the number related to the thermal resistance of layers. My 25mm is over 1 w/m2k which has poor heat retention. 100mm celotex has 0.22 I think which would perform better, which is what I should have gone for in the first place. Basically the closer to zero the better.
He then suggested I don't plaster as that would rinse me out in labour/material costs. So go plasterboard which is what many gyms have or indoor converted man-caves (some of you lot on here have done this).
So maybe if I get the right thickness that has a good u-value I might not need 100mm? Maybe 75mm to go over the existing celotex but if that has a poor value anyway I might as well chuck that and do it properly.
As the room is outside at the back of the garden there's no surrounding buildings to help so 100mm is probably right. Celotex or Rockwool though...hmmm..
Gonna ask a few insulation/builders to find out how much it might cost, see if its sensible to do it. I expect nothing less than £4k.
But like I mentioned above sometimes there's groups of 3 in there.
I wonder though how much it'd cost to do a partition? And how much work needs doing? Stud wall frame I am presuming, but I'd still wanna insulate the other walls better.
I think Sporky's idea of heating the person rather than the room is a good one.
Is the floor insulated?
As you know the values for the insulation, work out the surface areas, and calculate how much heat loss the various options have.
Once you know that, you can decide what will give you the biggest improvements, and if needed, do them in stages.
Floor - no, I have tried to cover it in an extra layer of carpet and might buy rugs but think its the walls. They're cold to the touch in the morning.
Essentially it's a metallic foil quilt designed for retro-fit roofing applications but with a very high U value . It's not especially cheap but a roll will go a long way .
It's easy to apply yourself and could look quite funky ;imagine a silver Puffa jacket lining of the room .
You can simply staple it on with a powerful building stapler but if you got 10 lengths of dirt cheap roofing batten and a bottle of Walnut stain ( Ronseal or similar ) ........stain the battens dark walnut (2 coats ) and use them as fixings screwed as uprights every metre stretching out the iso as you go then you will get a silver quilted room with walnut batten panels that will look very designed and be super insulated .
Effectively it's internally cladding the room with a high tech thermal quilt .
Its easy to fit yourself in about 3 hours
There's 8 of them in the room but we had to be careful where to put them up as there's a lot of sockets in the room so didn't want to drill into the wires to hang them up. Could the foil go in the gaps?
Got the number of the builder who did some ceiling work for my neighbours bedroom. Will get some options off him and maybe a price on what I'm looking at.