(Usually constructed fairly close to the wall - think "Cape Cod" style roofing.) This is often used to reduce the rafter span.ĭwarf wall: a small wall, built with a top and bottom plate (and doubled top plate if the rafters do not land directly over vertical studs) that is built to support rafters partway up the slope. DefinitionsĬollar tie: a section of wood that ties two opposite rafters together. Note that in this drawing, some of the outlined elements may not be necessary they are included purely for explanatory purposes. Illustration of some typical rafter elements. Here then, is some critical information to know about rafters. On the other hand, a carpenter or contractor can build a rafter system, and as long as it’s done right, rafter systems can meet the requirements of the National Building Code of Canada. Or, in simpler terms, a carpenter or contractor can build a truss – but it can’t be deemed Code-compliant. All of the local truss manufacturing companies do this. Here’s the critical difference: in order for a building inspector to certify a truss as Code-compliant, it has to be certified by an engineer as suitable for the snow loads in the area. The two systems have similarities – and differences. Although there are all kinds of styles of roofing styles and subystems (mansard, gambrel, gable, gable dormer, barn dormer), in the end, when it comes to most residential roofs, there are just two kinds of systems: rafters and trusses.
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