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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Help! Wall insulation
I have been lumbered with a porch on our ground floor flat with two
external masonry walls (one course of bricks). To make the room habitable I need to install floor, wall, and probably roof insulation (flat, cold roof). So far I have applied a bitumenous damp proofing to the concrete slab, and lined these walls with a treated timber frame 100mm thickness (with a gap between it an the external walls varying from 10mm to 100mm due to the curved wall). My question is- how can I best insulate these external walls? I was thinking masonry DPM timber frame with insulation inserted in between timbers. Will this be adequate for warmth and the building inspector? Rockwool cavity seems to be a good balance between quality and value although I'm not sure it is suitable for insertion between the timbers like I plan. Please provide some guidance. Many thanks Daniel |
#2
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Help! Wall insulation
Danny,
I posted this just recently............... Just thought I'd share this info with everyone. I've just added a Dormer to a new upstairs room. Basically 4" x 2" (95mm x 45mm) stud walls. I've 'stuffed' it with the following insulation called Rocksilk by Knauf. The spec. sheet gives the following details... UNIVERSAL SLAB RS45 Thickness 100mm (I have also used 75mm) Length: 1200mm Width: 600mm Area per pack (m^2): 3.6 Lamda (W/mK): 0.035 R Value (m^2K/W): 2.85 Fire ClassSlabs per Pack: A1 Pack per Pallet: 5 Product Code: 2361392 The price for one pack from Sheffield Insulations in Aberdeen was £32. So that's nearly £10 per square metre. Quite expensive for what it is. It is good to work with, easily cut with a breadknife. Just cut it about a quarter inch oversize and push between the studs. Chris. |
#3
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Help! Wall insulation
Cheers for that.
Did you put the DPM behind the insulation, or in front (before the plasterboard)? Thanks |
#4
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Help! Wall insulation
On 24 Nov 2005 09:44:51 -0800, a particular chimpanzee named "daniel"
randomly hit the keyboard and produced: I have been lumbered with a porch on our ground floor flat with two external masonry walls (one course of bricks). My question is- how can I best insulate these external walls? I was thinking masonry DPM timber frame with insulation inserted in between timbers. Will this be adequate for warmth and the building inspector? Hmm. The last question will depend on whether you're converting a porch into a habitable part of the dwelling or whether it was part before. If the latter, then you're not making the situation worse than previously and therefore don't need a Building Regulations application. If the former and you are 'renovating' the walls, roof or floor over a substantial area, you should insulate to a 'reasonable' standard. To answer your first question; you would be better with a PIR insulation such as Celotex, Kingspan, Xtratherm, etc. between the studs, and a vapour barrier on the _inside_ (polythene or foil backed plasterboard) to prevent condensation from within the building getting into the timbers. -- Hugo Nebula "If no-one on the internet wants a piece of this, just how far from the pack have you strayed?" |
#5
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Help! Wall insulation
daniel wrote:
Cheers for that. Did you put the DPM behind the insulation, or in front (before the plasterboard)? Thanks No I didn't as this is effectively an extension of the roof itself so there is roofing felt, then 22mm. sarking boards, then 95mm. studs packed with that RockSilk insulation, then 12.5mm plasterboard. There seems to be two schools of thought regarding putting polythene on top of the insulation and under the plasterboard. Who wants to live in a poly-bag? Chris. |
#6
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Help! Wall insulation
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#7
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Help! Wall insulation
The porch was not part of the dwelling before as there was an exterior
grade door between it and the dwelling, so my understanding is that we will have to insulate to a reasonable standard. Thanks for the advice, I think I'll pack the studs and then use a lined plasterboard as you mentioned. |
#8
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Help! Wall insulation
Ok, seems to be a similar situation to me then.
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