Insulation

[JJA]

Hi

I am currently stripping back a bedroom in a 1930's house, due a ceiling collapsing. Anyway I am looking to maxamise on the insulation in this room. So firstly i will replacing the loft insulation, and as you can see from my diagram the eaves run into the bedroom, should i fill these with insulation or will this stop the ventilation to the loft. I will be battening the outside wall a fitting it with kingspan, can i put this in the eaves as this will still allow an air gap up into the loft?

Thanks

Jon

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• JJA
• 29 Oct 2008
• 1

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[Fluffster]

As long as you leave a gap of about 50mm for ventalation you should be ok.
This is a working guideline not building regs for your info.

Pete

 

[JJA]

Is this a 50mm gap down by the wall plate, or is it between the felt on the roof and insulation, as my roof joists are only 3" so the kingspan is 50 mm?

 

[noseall]

do you intend insulating the raked ceiling to full spec?

if so then you will need (full fill) 100mm celotex or kingspan with 25mm underdraw then plasterboard.

if you don't have the depth within the rafters to accommodate this thickness then you can add battens.

unless you have soffit vents or fascia vents of some sort then your roof will not be vented via the eaves.

 

[noseall]

Is this a 50mm gap down by the wall plate, or is it between the felt on the roof and insulation, as my roof joists are only 3" so the kingspan is 50 mm?

the air gap should occur above the insulation, i.e. to create an air space between the topside of the inso' and the underside of the sarking.