Phil_space
Registered User
- Messages
- 62
Have searched through other posts but have not seen an answer to my question below.
I am planning a full renovation and small extension of a 1950s detached dormer and want to insulate the house beyond current building regs. Because of the age of the house there appears to be only a 2" cavity which was filled with polystyrene beads prior to my purchasing the house.
Was initially planning to insulate internally with Kingspan/Xtratherm on the external walls. However, have concerns about health issues in relation to these materials as I have heard that they have been banned from such use in some European countries. However, to reach low u-values I would need a large depth of alternative insulation, e.g. hemp, sheep's wool, which will significantly reduce my room area. I have looked into external insulation (outsulation) options but at 120 euro plus vat a m2 supplied and fitted it's a very pricey alternative. I know it's a common approach on the Continent but has any AAM subscriber actually fitted external insulation? Is it worth the money?
I am taking off the roof and replacing the floors so am happy that I can achieve appropriate u-values there but am worried about the walls and the corresponding dangers of thermal bridging. Have thought about using Poroton blocks for the extension but that won't solve my problems with the existing structure.
Any advice appreciated.
I am planning a full renovation and small extension of a 1950s detached dormer and want to insulate the house beyond current building regs. Because of the age of the house there appears to be only a 2" cavity which was filled with polystyrene beads prior to my purchasing the house.
Was initially planning to insulate internally with Kingspan/Xtratherm on the external walls. However, have concerns about health issues in relation to these materials as I have heard that they have been banned from such use in some European countries. However, to reach low u-values I would need a large depth of alternative insulation, e.g. hemp, sheep's wool, which will significantly reduce my room area. I have looked into external insulation (outsulation) options but at 120 euro plus vat a m2 supplied and fitted it's a very pricey alternative. I know it's a common approach on the Continent but has any AAM subscriber actually fitted external insulation? Is it worth the money?
I am taking off the roof and replacing the floors so am happy that I can achieve appropriate u-values there but am worried about the walls and the corresponding dangers of thermal bridging. Have thought about using Poroton blocks for the extension but that won't solve my problems with the existing structure.
Any advice appreciated.