Continuation of Part 7: Particular challenges on refurbishment projects
Old floor joists in refurbishment projects /penetrations of masonry/joists
Copyright: Harry Paticas/arborealarchitecture.com
Typical leaks can be found at the joist bearings of timber roof joists in the masonry structure. The bricks between the joists are generally not plastered. On refurbishment projects, joints with the old masonry can lead to leaks; on new buildings, non-mortared butt joints between bricks can cause leaks. Even if a layer of plaster has been applied, airtight joints to the joists are generally neglected. This is indicated by air currents through the joints between old wooden floorboards detected during blower door tests.
This series of articles summarises typical, challenging joint situations and shows how technicians can find practical solutions for these challenges. It also provides an overview of the detail features for which prefabricated solutions are available that allow tradespeople to achieve airtightness in a quick, easy and reliable manner.
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