Green Building Forum - Insulating concrete floor slab outside below ground level Tue, 19 Dec 2023 08:38:51 +0000 http://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 Insulating concrete floor slab outside below ground level http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17745&Focus=300351#Comment_300351 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17745&Focus=300351#Comment_300351 Sun, 19 Feb 2023 14:28:00 +0000 zak99
What insulation should I use please and how deep should it go?

Rgds,

Zak99]]> Insulating concrete floor slab outside below ground level http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17745&Focus=300355#Comment_300355 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17745&Focus=300355#Comment_300355 Sun, 19 Feb 2023 15:45:02 +0000 Peter_in_Hungary
Go as deep as the base of the foundations or if the foundations are a silly depth then 600m - 750mm. (or just 500mm 'cos that is the width of a sheet of EPS) Over here with winter temps down to -18 on occasions I've not seen water pipes freeze if they were 300mm below ground and I have a soil pipe that has only 150mm of soil covering and never had any problems. The point being it is the first 300mmor so that is the most important.

Use EPS and put on the adhesive + mesh on the outside but no need for the decorative thin film acrylic render.

See
http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=10206&page=1#Item_24
for the debate about EPS or XPS below the DPC]]>