I am currently up to the stage in my loft conversion of insulating in between the reffter's. I have got left a lot of the itchy fibre glass insulation. I believe this is ok to use . What is it like for keeping the sound out and what is the best way to get it to stay in the reffter's. Is it ok to keep it in with string before my plaster board goes up ?
Loft insulatio
- Thread starter diy2985
- Start date
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you will need very deep rafters for fibreglass insulation to be effective or meet current u value standard. 
is this a loft conversion with building reg's or a diy loft space 'enhancement'?
is this a loft conversion with building reg's or a diy loft space 'enhancement'?
the amount that you may cram in between a rafter will offer some thermal insulation but no where near enough as to be efficient. a lot of heat will escape.
at least you will never have snow on your roof.
there will also be issues of condensation which could lead to mould or rot.
at least you will never have snow on your roof.
there will also be issues of condensation which could lead to mould or rot.
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look at using celotex or kingspan which are rigid foam type insulators.
to meet reg's you would need 85mm between and 25mm under-draw.
you may also need an air gap too.
to meet reg's you would need 85mm between and 25mm under-draw.
you may also need an air gap too.
add some timber knock-on battens to the existing rafters.
Thanks again for advice. The problem I have got if I add more timber I will lose head height and I can just about stand up now in the highest point and I am only 5ft 5 inches.
If I only have 3 inches of lagging insulation and a heater up there, will itbe freezing ?
If I only have 3 inches of lagging insulation and a heater up there, will itbe freezing ?
if you are not trying to make it a habitable room, just a clean storage area, then even 50mm of insulation wil make a substantial difference.
But you talk about "loft conversion" and "plasterboard" and "heater" and "office," so I do not think you accept that it will just be a storage area. Perhaps you are one of those people who want to make a cheap loft conversion that does not meet proper standards. we get a lot of them on here. Some of then want their lodgers or children to sleep or play in an area with papers, a heater, no proper stairs, and no fire exit.
But you talk about "loft conversion" and "plasterboard" and "heater" and "office," so I do not think you accept that it will just be a storage area. Perhaps you are one of those people who want to make a cheap loft conversion that does not meet proper standards. we get a lot of them on here. Some of then want their lodgers or children to sleep or play in an area with papers, a heater, no proper stairs, and no fire exit.
Just curious noseall. What's 'under-draw'?
Ooo missus!
a layer tacked to the underside of the rafters going completely across them. it provides a barrier to thermal bridging at the rafter junctions.
without the underdraw the rafters may become 'visible' on a cold day, even through a layer of plasterboard and skim. this is due to the temperature differential occurring at these junctions.
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