We include sketches of collar ties, rafter ties, and structural ridge beams as well as illustrations of collapsing and collapsed structures where these roof rafter ties were lost or omitted.Ī cathedral-ceiling roof framed with no structural ridge and no ceiling joists (sketch shown above) risks suffering two problems: sagging rafters, worse on low-slope roofs, and outwards spreading of the building walls as the roof loads press down on the structure. Without the proper support of rafter ties or a structural ridge, a typical gable or sloped roof will sag downwards while pushing the building walls outwards towards a catastrophe. This article series describes and illustrates the different types of support that prevents roof sagging and wall bulging at buildings, including definitions of collar ties, rafter ties, and structural ridge beams.

Here we describe Canadian roof framing guidelines. Proper placement & connections of collar ties and ceiling joists are required for gable and hip roofs in order to avoid sagging rafters and worse, collapsing roofs. Intermediate Roof Collar Ties as Compression Supports: Canadian Roof Framing Specifications We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. This article excerpts from & provides copies of roof framing suggestions from Canadian building codes and the CMHC Wood Frame House Construction Guide.įraming any roof but particularly a gable roof, low slope roof, and cathedral ceilign roofs requires collar ties, rafter ties, and possibly a structural ridge beam to support the roof and to prevent ridge sagging and wall spreading. Roof Framing Suggestions, Canadian guidelines:Ĭanadaian roof structure framing suggestions, codes, guides for gable roofs, low slope roofs, cathedral ceilings. We have no relationship with advertisers, products, or services discussed at this website.

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