Image:Timberpen.jpg
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Timberpen.jpg (109KB, MIME type: image/jpeg)
This picture shows a typical through-penetration in a timber building. It must be firestopped in a manner considering strict bounding to be in compliance with the law. Combustible buildings can have fire compartments, consisting of assemblies capable of achieving a fire-resistance rating. Typically, wall assemblies made of wooden studs, must be boarded with "Type X" or glass fibre re-inforced gypsum wallboard, where the installation must consider bounding. Wooden floors are often topped with thin layers of concrete. Through-penetrations for mechanical or electrical services, as shown here, are not formed by sleeving, but by chainsaws that go right through everything. The determining factor for the penetration sizing in this case is the width of the chainsaw blade. While combustible buildings can be compartmentalised and sprinklered, achieving some degree of regulated fire protection, they typically have severe height and size restrictions, compared against noncombustible buildings, both because of structural integrity and fire protection concerns.
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