Hi
I have a house cavity block walls and zero insulation and I want to get them up to a reasonable U-value. The usual options for internally insulating that I hear about is attaching studs and insulate between with fibre glass and plasterboard outside.However our floor space is TINY. So, I have to internally insulate (cant do external) but have no space. Is there a product out there that can be used in this sort of structure that has such a good k-value that it will only need minimum thickness to get good results?
Does anyone have any recommended products for this option? I have heard of some aerospace insulations but not sure of their application.
Any help would be appreciated.
Hi ONQ,
I have seen some of your posts before and you seem to know a bit about this area.
Given that both internal and external insulation have their drawbacks,have you any comments on the idea of mounting internal insulation on battens with a 25mm ventilated cavity between the wall and the insulation.
Of course every effort should also be made to vapour check as well and there is a loss of performance due the fact that you would have to ignore the existing wall in terms of insulation.
Would be interesed in your thoughts.
Thanks
3CC
Hi ONQ,
Thanks for a detailed and thorough reply.
To clarify, my suggestion is to use Kingspan type rigid board insulation for internal insulation on a hollow block semi detatched house. The insulation would be 100mm thick attached to 25mm thick treated battens. I accept that great care needs to be taken to prevent vapour getting past the joints at the board/board interfaces and the board/joist interfaces (more difficult). As a belt and braces approach, I wondered at the sense in having the 25mm cavity ventilated with external cold air. This would be done at first floor level by opening the cavity into the attic space at the top and by using 50mm holes through the hollow block at the bottom. The vent holes to be sleeved with PVC tubes, sloped outwards and incorporate fly screens etc.
Similar ventilation of the cavity at ground floor level could be achieved with vents at the top and opening the cavity to below the suspended ground floor at the bottom.
The reason for the query is that I think internal insulation is often knocked on the basis of the potential for interstitial condensation. It would be nice if there was a relatively practical way of reducing this risk to an acceptable level.
Thanks,
3CC
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