![]() ![]() ![]() The rise is the vertical distance from the plate to the upper end of the rafter (upper end of the work line). In the case of a plain gable roof with the ridge in the middle of the building, the run is half the width or span of the building. The run of a rafter is the horizontal distance measured from the outside edge of the plate to a point directly below the top end of the rafter (see Fig. It is used as a base line in measuring and marking out the rafters. Definitions.-The ivork line is a straight line laid off about midway between the edges of the rafter and parallel to them. This is easily done by means of the carpenter's steel square and is made possible by the fact that a rafter may be considered as the hypotenuse of a right triangle, the rise and run of the rafter being the other two sides or legs of the triangle.ġ21. ![]() The main jobs in laying out a rafter are (1) determining the angles of cut at the ends of the rafter and at the bird's mouth or seat, and (2) determining the length. The student should, therefore, strive to understand principles rather than to rely upon certain rules and figures that may memorized. Our technology, systems and processes also mean you get your high quality report shortly after your inspection is completed.Īnd all this for an incredible low price.Laying out a rafter is not a difficult problem if the workman understands the underlying principles. We are always happy to answer all your questions and you are most welcome to be on site when we do the inspection. Good communication and local knowledge are key to you getting the most out of your building and pest inspection. Our Office team make all the arrangements with you, your agent, the vendor, the tenant (if there is one) and you will be sent an email to confirm the inspection time along with a pre-engagement letter which covers the scope of the inspection. When you book a pre-purchase inspection with ABIS, our friendly local (they know the area and are not in a interstate or overseas call centre) staff will make the whole process easy for you. ABIS Inspectors are supported by a unique computer aided inspection system and the latest inspection equipment such as high sensitivity thermal cameras costing thousands of dollars that others don’t often have. Our highly recommended home inspectors are all long term trusted employees not here today gone tomorrow sub-contractors. ABIS has been in business over 27 years conducting both building and timber pest inspections. Even where the roof structure is a truss, the top chord of the truss is called a rafter.ĪBIS building and pest inspections are conducted to the highest standard by building inspectors with a minimum of 10 years experience together with the highest professional qualifications in their field. Rafters carry loads from the battens and the gravity loads from the roof structure to the tops of the walls. Valley creeper rafter – a rafter connecting ridge and valley.Valley rafter – a rafter following the line of the internal intersection of two roof surfaces.Principal rafter – an upper member in a truss having the same inclination as the common rafters.Jack rafter – a rafter that fits against the end of a ridge at the intersection of two hips.Hip creeper rafter – a rafter connecting a wall plate and hip.Hip rafter – a rafter following the line of the external intersection of two roof surfaces.Crippled jack rafter – a rafter connecting the end of a ridge to a valley.Cripple rafter – the rafter connecting a hip and valley.Common rafter – the main support rafter of the slope between eaves, wallplate and ridge.A Rafter is one of a series of sloped structural (usually timber) members that extend from the ridge or hip to the downslope perimeter or eave, designed to support the roof and its associated loads: ![]()
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