Carpe Diem Posted April 12, 2022 Share Posted April 12, 2022 Hi All, Hoping for some advise. I am building a passivhaus and the basic construction method is a thin joint thermal block system with 200mm of Graphite EPS over it. At ground floor level the builder has used a solid insulation polystyrene, which he has rendered over. Currently, this is just rendered over with the top adhesive. There is to be a spray render of it, and the bottom 150mm will use a mineral render which stops the ingress/splash of water from penetrating the render and causing it to mould or blow or time. Its an Atlas mineral render product he has suggested. I have not been able to find anything about this method, and I am concerned this is not correct. Does anybody have any input? Link to comment Share on other sites More sharing options...
PeterW Posted April 12, 2022 Share Posted April 12, 2022 What is the system and what does the manufacturer say ..?? Link to comment Share on other sites More sharing options...
Temp Posted April 12, 2022 Share Posted April 12, 2022 Some manufacturers of render do/don't approve their render for use below DPC. I would try and check with them. Link to comment Share on other sites More sharing options...
Carpe Diem Posted April 12, 2022 Author Share Posted April 12, 2022 The builder has being using Atlas products, to do the base coat, but the final render we were going to get a specialist company in to do. I have had a company come in from Terrix to quote on spray rendering, they mentioned the floor finish and drip detail, but accepted the explanation from the builder - however, they have said they wont guarantee the work, as we have not used their full system throughout, which is also a concern. My gut reaction is it does not matter, as even if we had used their full system, they would blame the installer etc, so the guarantee is not really worth anything anyway. Link to comment Share on other sites More sharing options...
nod Posted April 13, 2022 Share Posted April 13, 2022 Your builder is correct Render or brick slips below dpc is quite normal The reason why your render companies have flagged this is Anything below dpc can only be considered cosmetic Link to comment Share on other sites More sharing options...
Carpe Diem Posted June 21, 2022 Author Share Posted June 21, 2022 We are just about to start rendering and I have noticed that in some areas he has used eps insulation where the ground level will cover this. In most places it is 200mm of xps but in a couple of areas, he has used 100mm of xps against the wall and then 100mm of eps on the face side. He reckons it will be fine. Any comments? Link to comment Share on other sites More sharing options...
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