30-6 Posted July 14, 2014 Report Share Posted July 14, 2014 As per title, can you insulate a house with cavity walls with external insulation, ( the compressed grey coloured polystyrene panel type ) ? I have been advised yes and no, so am a bit confused. On solid walls they seem to dab and pin the panels on, before rendering etc, so why can't they do the same to cavity houses ? They seem ok to drill cavitys with multiple holes and fill with polystyrene beads. Quote Link to comment Share on other sites More sharing options...
saddler Posted July 14, 2014 Report Share Posted July 14, 2014 Seen it done on several of the TV shows Quote Link to comment Share on other sites More sharing options...
WGD Posted July 14, 2014 Report Share Posted July 14, 2014 The cavity will be probably ventilated, it would therefore be a cold space which you would be insulating outside of, that would be a waste of time. I'm not a fan of cavity fill insulation either. Quote Link to comment Share on other sites More sharing options...
Donkey Posted July 14, 2014 Report Share Posted July 14, 2014 (edited) Loads have been done near me 100mm Rockwell bats then a k render on top Edited July 14, 2014 by Donkey Quote Link to comment Share on other sites More sharing options...
HDAV Posted July 14, 2014 Report Share Posted July 14, 2014 (edited) Matilda's blanket made in the old borg warner factory at baglan if it wasn't just a scam to pocket govt subsidy for green tech..... http://www.walesonline.co.uk/business/business-news/matildas-blanket-offers-solution-insulating-6740905 Edited July 14, 2014 by HDAV Quote Link to comment Share on other sites More sharing options...
Fisheruk Posted July 14, 2014 Report Share Posted July 14, 2014 Yes, you can. I have a house with a narrow cavity 130 years old. 100mm external insulation with high performance silicone render over it. No problem. Quote Link to comment Share on other sites More sharing options...
Gimlet Posted July 14, 2014 Report Share Posted July 14, 2014 (edited) The cavity will be probably ventilated, it would therefore be a cold space which you would be insulating outside of, that would be a waste of time. I'm not a fan of cavity fill insulation either. Nor am I. I want to convert an outbuilding which has uninsulated cavity walls. The outside will be timber clad but even so I won't be using cavity fill insulation because of bridging and resulting cold spots. I prefer to add the insulation to the internal surface and accept the loss of space. Edited July 14, 2014 by Gimlet Quote Link to comment Share on other sites More sharing options...
kent Posted July 15, 2014 Report Share Posted July 15, 2014 As per title, can you insulate a house with cavity walls with external insulation, ( the compressed grey coloured polystyrene panel type ) ? I have been advised yes and no, so am a bit confused. On solid walls they seem to dab and pin the panels on, before rendering etc, so why can't they do the same to cavity houses ? They seem ok to drill cavitys with multiple holes and fill with polystyrene beads. Yes, the boards are fastened with stainless mesh over and likewise fixings, then render is applied. What you need remember is you then have issues with things like outside lights shutters and anything else you wish to fit to those walls. I dislike filled cavities having seen stacks of issues with it. I looked carefully at the above ext boarding when building this house but decided on internal insulated boards being more practical for our plans in the future. If I was doing a new build I should certainly look at a proper passive house but presently the family has a ban on me doing another big one for us or selling this place Quote Link to comment Share on other sites More sharing options...
Assured Posted July 15, 2014 Report Share Posted July 15, 2014 I used to install a system called swisslab system which is an external insulation with either pebble dash or render over the top.it involves coating the wall in an adhesive fixing insulation boards to it by drilling pins into the wall,then scrim,then either render or dash. Quote Link to comment Share on other sites More sharing options...
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