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Insulation for internal solid walls


mc55

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anyone used Celotex for internal solid wall insulation ? I've bought some of the small slabs to put in my small toilet on the inside of the outside wall which has no plaster currently. Debating buying it for the rest of the house, but it's quite expensive, so interested to hear any thoughts for / against it.

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I'm looking at PL4000 for the rest of the house - think it is only in 25mm thicknesses.

 

I got the smaller boards from Wickes, but they are a different size so waiting for my builder to have a look at it to make sure it's the right stuff. The big sheets were way too big for me to transport today.

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Celotex is brilliant for thermal applications where space is at a premium. If you we're insulating a flat roof, you could install 150mm between the joists to meet current building regulations, you would need 270mm to achieve the same u values if you we're using mineral wool which wouldn't fit.

 

For an internal bathroom wall you are after sound insulation properties. Mineral wool would be best for this application. It's much cheaper too.

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I was reading your other post re. Chimney damp... Did the sweep work? Usually damp on th chimney breast is caused by capping off the stack and not venting it or defective flashings. If the fire is not used in winter there is also a chance of condensation if windows have been changed or air bricks have been blocked up.

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Celotex is brilliant for thermal applications where space is at a premium. If you we're insulating a flat roof, you could install 150mm between the joists to meet current building regulations, you would need 270mm to achieve the same u values if you we're using mineral wool which wouldn't fit.

 

For an internal bathroom wall you are after sound insulation properties. Mineral wool would be best for this application. It's much cheaper too.

 

Products like YBS superquilt are very good for wall and rafter applications too.

 

 

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I was reading your other post re. Chimney damp... Did the sweep work? Usually damp on th chimney breast is caused by capping off the stack and not venting it or defective flashings. If the fire is not used in winter there is also a chance of condensation if windows have been changed or air bricks have been blocked up.

 

Chimney sweep is coming on 21st December. I think you will be right - I know that the apron / flashing etc around the chimney is in dire need of attention and it also has some rubbish tiles and some pointing that needs repairing. Just waiting for my roofer to have time to fit me in and I'll also ask him to cap the unused chimney with a mushroom top pot thingy and will get him to fit a pot onto the one that we want to use eventually. I think between the roof/chimney repairs and then the sweeping it'll hopefully sort the issues.

 

I think we bought a bit of a money pit - good job we love it !

 

---------- Post added 13-12-2012 at 23:39 ----------

 

Celotex is brilliant for thermal applications where space is at a premium. If you we're insulating a flat roof, you could install 150mm between the joists to meet current building regulations, you would need 270mm to achieve the same u values if you we're using mineral wool which wouldn't fit.

 

For an internal bathroom wall you are after sound insulation properties. Mineral wool would be best for this application. It's much cheaper too.

 

Not sure why you'd want to insulate interior walls with celotex. AFAIK it's properties are mainly for thermal use.

 

There are some more specialist products around for sound insulation.

 

I think I might have caused some confusion with my description. The wall I'm going to insulate is the external wall ... but I'm putting the insulation on the 'inside' of the exterior wall (haha guess this is probably bleeding obvious to most of you, you're not gonna stick it to the outside right !!).

 

I have also put some mineral wool into the interior 'stud' walling which will then have plasterboard over the top - for sound and additional heat loss prevention :)

Edited by mc55

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(haha guess this is probably bleeding obvious to most of you, you're not gonna stick it to the outside right !!).

 

yes, its called thin coat rendering or external wall insulation (ewi). eps boards fixed to the wall on the out side and then rendered, you will start to see a lot of this next year.

 

i hope the info helps i sent, it might be worth shopping around as their might be cheaper insulation p/boards around with the same or better heat retention. make sure the system is boarded tight and i would be tempted the mastic/seal the joints along the ceiling and floor (just me) before skimmg or T&Jing it.

 

if you live in a council property, it my be worth having a word with them as they might be able to help you.

 

hope this helps,

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