![]() They cannot be assumed to provide support for a splice, however (see below). Collar tiesĬollar ties can be used used to reduce rafter span – they essentially provide intermediate support for the rafter, but only for roofs with a pitch of more than 1:3. In this case, ceiling joists or a floor system usually serve as the lateral ties. For one, if the lower ends of the rafters “are adequately tied to prevent outward movement”, there is no need for a ridge board. Rafter systems for steeper roof pitches are a little less stringent. Rafters for roofs with a slope of 1:3 or more
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