EWI & DPC

[canalsiderenovation]

Hi

 

I'd posted a thread on the rendering forum but wondered if someone had any views on Jablite for EWI. Grateful for any comments on this thread and particularly around the issue of our DPC being higher in some parts and possible options such as plinth insulation allowing us to render over DPC (I think)!

 

 

[Dudda]

I don't know of the Jablite system but on our house when we externally insulated our 1970's house we just plastered it flush. You have the grey EPS above DPC and the white insulation below the DPC. We had it done about 4 years ago and used the aluminium DPC tray but this finishes flush with the insulation and the whole thing is plastered over flat. Externally it's impossible to tell where the DPC layer is except when it freezes hard. Then the aluminium which conducts the heat from inside shows as a thin horizontal line. See attached.

If doing it again they now don't use aluminium as it's a thermal bridge and they use plastic or carbon.

 

We also dug out footpaths to allow the insulation continue down below ground level which helps a lot as you can't add thermal blocks to an existing wall.

Aluminium DPC tray level with DPC in wall

 

DPC level varies around the house due to slope in site and change in levels internally

 

In very cold weather you can see the DPC line due to the aluminium which conducts heat. They now use plastic or carbon DPC trays.

Edited April 8, 2021 by Dudda