Civil Engineering Reference
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struct it from smaller-section timbers (as specified by a suitably qualified person) than the
structural frame. This in turn may make the use of hardwood a more viable option for this
section of the frame, which further improves the detail. Weighed against this, however, are
the additional material and labour costs of a using double frame, and the fact that a synthet-
ic vapour-permeable membrane should still be used to provide airtightness, although in the
case of a hardwood frame it would not be needed to protect the timber. One of the biggest
arguments in favour of the double-frame solution is the reduced labour and material costs
on the shuttering, since temporary shuttering boards can be screwed straight to the frame
on both sides.
From the examples set out here, it should be clear that the detailing of various claddings
for hempcrete is an evolving 'conversation' rather than a hard-and-fast set of rules. As long
as the basic principles of structural integrity, airtightness and protection of surface timbers
are addressed, there is no 'wrong' way of detailing it. The details discussed here are not
intended to provide the reader with an exhaustive list of options; rather to show some ways
in which the issues can be addressed, while demonstrating that the way in which you deal
with one issue can have an impact on the others - making the process quite complex and
demanding of a holistic solution.
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