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RubiconCSL
Junior Member
Joined: 22 Jul 2008
Posts: 1
Location: Somerset UK
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 Posted: Tue Jul 22, 2008 3:34 pm Post subject: Insulating and plastering inside a pitched roof |
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Hi - first post, so hope it is in the right place.
We are fitting a new kitchen and decided to open the roof up and make a vaulted ceiling. There is no upstairs above the kitchen before you ask :)
As a result of removing the ceiling, we will then be un-insulated. I want to, therefore, put some sort of rigid foam insulation in (Celotex for example). I was hoping you can tell me if there is a product of equiv. thermal value but with plasterboard attached - saves doing it in two jobs.
If there is and I'm on the right path, does this really need a skim, or can it just be painted - providing I can fit it nice and tight and not leave unsightly gaps!
Advice appreciated, as we've been quoted 3.5k to do this - and it isn't the cisteen chapel! Room is about 5.8mtrs by 4mtrs.
Thanks. |
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ultimatehandyman
Site Admin
Joined: 16 Jul 2005
Posts: 9278
Location: Darwen, Lancashire
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| Posted: Tue Jul 22, 2008 4:45 pm Post subject: |
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Hi and welcome,
I am not sure about the thermal values but here is a link to thermal board on the lafarge website-
http://www.lafargeplasterboard.co.uk/
You will have to search for the thermal plasterboard I am afraid as their stupid website puts session id's into the url and it makes them impossible to link to 
If you can't find the info in a pdf document on their site you should be able to email them.
The boards will taping and skimming, unless you want it to look unfinished. There will also be lots of screw holes that the skim of plaster will cover up.
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fin
Senior Member
Joined: 16 Apr 2008
Posts: 264
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| Posted: Tue Jul 22, 2008 7:35 pm Post subject: |
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you could always try the thin foil type of insulation. tri-iso super 9 i think its called now. we used it in loft conversions till it was deemed not to pass a certain test which is ridiculous really. even the local building inspectors agree its crazy.
if you chose to use that its fairly straight forward to use. staple gun it to the rafters and counter batten with 2x1 and board it out |
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fin
Senior Member
Joined: 16 Apr 2008
Posts: 264
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nearnwales
Junior Member
Joined: 13 May 2006
Posts: 13
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| Posted: Wed Jul 23, 2008 8:06 pm Post subject: |
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I'm on a attic conversion now and the regs are the same for your ceiling 50mm air gap, 50mm celotex between the joists, and then 75mm across the joists .12.5mm normal plaster boards , All joins should be taped also.
You will not get the U value with insulated plaster boards I asked the bc the other week .
It's a bit over kill but if you ask building control that is what he'll say
also because its above your kitchen I'd skim it because of all the steam and burning oil ect.
good luck |
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