November 15, 20205 yr Hi everyone, so my question is the above mentioned. although i have half a clue what the reasons are, i dont understand it fully. the reasons why im asking is if i for example wanted to build a 3m half brick wall, say 5 courses high, it would seem excessive to me to dig a footing 3 feet deep. so as i understand it the frost line in the southeast of england here is 450mm and i should dig 12 inches below this which would be shy of 3 feet. im i understand this correctly? many thanks
November 15, 20205 yr Soil expands when the water in it freezes, potentially causing uplift, but even NHBC do not require that much, and that's for load bearing, not decorative features. https://nhbc-standards.co.uk/4-foundations/4-3-strip-and-trench-fill-foundations/4-3-3-ground-conditions/
November 15, 20205 yr It's called frost "heave". You can protect against it I believe by wrapping in EPS.
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