Civil Engineering Reference
In-Depth Information
Waste pipes fitted by drilling through the hempcrete.
Any shrinkage of the hempcrete away from the pipe as it dries could cause a passage for air
through the wall, but this can be mitigated by wrapping the pipe in a thin layer of soft nat-
ural insulation material such as hemp-fibre quilt insulation, which will be compressed by
the hempcrete cast around it and will be springy enough to fill the gap left by any shrink-
age.
Drilling out holes for pipes after the wall is cast is perfectly possible, but it is likely to
result in a pipe being fitted with a small air gap around it right through the wall. From
an airtightness point of view, casting with the pipe in place is the recommended option. If
drilling through afterwards, care must also be taken to choose a location that avoids the
structural frame and any electricity cables within the wall.
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