i did re-insulate the attic but i have not noticed any differance,that is why i was asking about getting the walls done.
Thanks for the info.
Double insulation generaly offers no increase in the insulating benefits.
60mm in the cavity and 25mm on the internal wall equates to 60mm worth of heat retention and not 85. Counter intuitive I know. The heat will merely stop at the thickest piece of insualtion and pass thru the thinest.
In 2005 the regulation was 60mm HD insualtion in the cavity.
"plasterboard with insulation up on the inside to help increase the u-value"
Double insulation generaly offers no increase in the insulating benefits.
60mm in the cavity and 25mm on the internal wall equates to 60mm worth of heat retention and not 85. Counter intuitive I know. The heat will merely stop at the thickest piece of insualtion and pass thru the thinest.
In 2005 the regulation was 60mm HD insualtion in the cavity.
... its for a 300mm cavity wall with 100mm outer leaf, 100mm cavity, 100mm inner leaf...
... go back to the 60mm insulation and then maybe put some plasterboard with insulation up on the inside to help increase the u-value?
So, getting back to the OP's original question....
With a 100mm cavity, a good solution is a 60mm insulation (Kingspan seem to have two different types: Therma & Kooltherm) in the cavity and an insulated dry-lining board on the inside?
Insulation is relatively cheap especially when compared to the overall cost of a house. There are many options. Do your homework & make your own decision after advice.
I think all readers should investigate, with there Designer, Certifier & BER Assessor the correct thickness of cavity insulation required to comply with current Building Regulations.
I would not advise retro pumping a 40mm cavity, when the correct thickness can be installed now!
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