tag:blogger.com,1999:blog-4805693061694683438.post327267018718579998..comments2024-01-07T04:13:53.756-08:00Comments on Passive House Toronto: Footing InsulationsLyndon and Phi Thanhttp://www.blogger.com/profile/15905919606181622527noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-4805693061694683438.post-9905242747027469992011-04-04T06:15:56.287-07:002011-04-04T06:15:56.287-07:00John is right in pointing out the soil bearing cap...John is right in pointing out the soil bearing capacities. I wouldn't use a soil bearing capacity more than say 100kPa (about 15psi) in a normal house foundation design. However, I think in other posts I might have mentioned the XPS (and I suspect other foams) are subject to long term creep. In other words, they will crush down very slightly over time, in the amount of 5% of thickness at rated load. This is the reason to use the harder stronger foam insulations under footings. Straight comparison to soil bearing capacities is not the only determinant.<br />LTLyndon and Phi Thanhttps://www.blogger.com/profile/15905919606181622527noreply@blogger.comtag:blogger.com,1999:blog-4805693061694683438.post-70424092710323154282011-01-28T18:28:35.213-08:002011-01-28T18:28:35.213-08:00Is the compressive strength of the standard foam d...Is the compressive strength of the standard foam density's not sufficient? I seem to recall them as being between 15-25 psi... What is the soils bearing density?Jobehttps://www.blogger.com/profile/18424713535917319022noreply@blogger.com