Home
|
Forum
|
How To Guides
|
About Us
|
Affiliates
|
Contact Us
Welcome, Guest. Please
Login
or
Register
Apr 29
th
, 2024, 4:15pm
View recently thanked users
View top thanked users
Quote:
If your car could travel at the speed of light, would your headlights work?
Ask The Trades
›
DIY Forum
›
Building Questions
› Reroofing and loft insulation
(Moderator: TIMBA-WOLF) - (Moderator Group: Board Moderator)
<
Previous Topic
|
Next Topic
>
Pages: 1
Reroofing and loft insulation (Read 6347 times)
Sarah
GDPR opt-out
Reroofing and loft insulation
Jan 26
th
, 2015, 7:01pm
Hi there
Sorry if I break any etiquette or rules but I'm a newbie!
I'm looking to get quotes to have my roof reslated and I've read that it's most likely I'll need my insulation upgraded in my loft. I'm also looking at getting my loft boarded out but I just wondered if my loft was boarded out, would I have to get up the boarding to add more insulation or use an alternative? There isn't a great deal of head height in my loft so I don't really want a massive thick insulation and then have to use spacers and board over it. This is the reason I thought of boarding it first, then doing the roof if I can get away without having new insulation.
Thanks for any help in advance!
Sarah
Back to top
IP Logged
thescruff
Global Moderator
Trade Member
Author
Offline
Who said plumbing was
easy.
Posts: 6037
Total Thanks: 147
For This Post: 0
Gender:
Trade: Plumber
Re: Reroofing and loft insulation
Reply #1 -
Jan 26
th
, 2015, 11:53pm
Have a word with the roofer/builder you may be able to use 100mm Celotex or similar between the rafters
Back to top
IP Logged
woodsmith
Global Moderator
Trade Member
Author
Offline
Posts: 4395
Total Thanks: 135
For This Post: 0
Gender:
Trade: Joiner
Re: Reroofing and loft insulation
Reply #2 -
Jan 27
th
, 2015, 9:23am
Im assuming the boarding is so that you can store things in the loft, the trouble is that if you insulate under the boarding the roof void becomes particularly cold and even with a lot of ventilation you can still get condensation forming within the roof space. I am just working at a house where the owner has just discovered the photos she has been keeping in the loft have glued themselves together and become a sticky ruined mass. If you really want to store things in the loft and you are having the roof re-tiled you would be better off creating a warm roof where you insulate under the tiles rather than over the ceiling of the room below.
You should be able to ask you builder about the pros and cons of having a warm roof.
Back to top
IP Logged
CWatters
Super Member
Offline
"Daddy fick it" says James
Posts: 5150
Total Thanks: 58
For This Post: 0
Gender:
Re: Reroofing and loft insulation
Reply #3 -
Jan 29
th
, 2015, 6:59pm
You could move the insulation to between the rafters but I would use far more than 100mm. I have 150mm and wish I had more. Part of the problem is that the rafter bridge the insulation and it's very hard to fit it tightly between the rafters so there are gaps. Sure these could be filled with expanding foam but that's a messy job and not that easy to do well - how do you get it into a <2mm gap? If the membrane isn't vapour permeable you also need to form a 50mm ventilated gap between it and the insulation. If you want to go this route I would put a layer of insulation under the rafters as well as between so boards can be butted together and joints taped.
Personally I think it's best to beef up the insulation at ceiling level and use stand offs to support the boards. Seal up any holes between the warm humid house and the cold loft, particularly where pipes from the bathroom enter the loft. Ditto the loft hatch. Ventilate the loft well to the outside using eaves trays.
Back to top
IP Logged
CWatters
Super Member
Offline
"Daddy fick it" says James
Posts: 5150
Total Thanks: 58
For This Post: 0
Gender:
Re: Reroofing and loft insulation
Reply #4 -
Jan 29
th
, 2015, 7:03pm
PS: If you have less than 4" of insulation British Gas will (should?) upgrade it for free...
https://www.britishgas.co.uk/energy-saving-products/home-insulation?campcode=EON...
Back to top
IP Logged
Lectrician
Administrator
Trade Member
Author
Offline
Ask The Trades
Posts: 8814
Total Thanks: 109
For This Post: 0
Braunton, North Devon
United Kingdom
Gender:
Trade: Electrician
Re: Reroofing and loft insulation
Reply #5 -
Mar 3
rd
, 2015, 6:40am
A lot of new houses these days have insulation in between the actual roof timbers, as well as the ceiling timbers. Usually cellotex or similar. Cellotex takes up less space than the save Rvalue in cosy wrap.
Back to top
Need to post a picture? Click
HERE
for info!
IP Logged
Pages: 1
(Moderator: TIMBA-WOLF) - (Moderator Group: Board Moderator)
<
Previous Topic
|
Next Topic
>
Ask The Trades
›
DIY Forum
›
Building Questions
› Reroofing and loft insulation
Forum Jump »
Home
» 10 most recent Posts
» 10 most recent Topics
DIY Forum
- Electrical Questions
- Plumbing Questions
- Carpentry Questions
- Building Questions ««
- Painting, Decorating & Tiling Questions
- Alarms, Phones, Aerials, CCTV & Datacomms
Public Forum
- Just Talk
- Humour
- The Forum
- Trade Applications
Ask The Trades
» Powered by
YaBB 2.3
!
YaBB
© 2000-2008. All Rights Reserved.