The problem
A sealant may have several functions but its main job is to allow some movement to take place at junctions while keeping water and wind out of the building. Typically, sealant is applied around openings, such as windows and doors; to movement joints in long runs of walls; and where dissimilar materials meet.
If you get it wrong, you risk premature failure or damage to the components of the building around the sealant joint due to damp penetration. There is also a risk to the health of the occupants where damp encourages internal growth of fungi and mould.
Replacing sealant is not a cheap option, as it will invariably include scaffolding. In addition, there may be considerable work involved in removing existing sealant and making good the joint for a new application. Clearly, the onus is on the designer and applicator to get it right first time.
As usual in the construction industry, guidance on good practice is available but spread about several sources. A recent Construction Industry Research and Information Association guide on sealant design, specification and application ran to 200 pages.
What to look out for on drawings
If you get it wrong, you risk premature failure or damage to the components of the building around the sealant joint due to damp penetration
What to look out for on site
Source
Housing Today
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