Roof Rafter Detail

Effective run is the run span 2 minus the ridge deduction usually the ridge board 2 and is the dim used to calculate the rafter length.

Roof rafter detail.

Rafters are inclined members spaced from 16 to 48 inches apart. Shed gable hip gambrel and mansard. The typical spacing standards for residential and commercial buildings are about 1 to 2 foot. Depending on how wide the home is you can divide the total length in feet by two to determine how many trusses will be needed.

The rafters carry the applied loads to the exterior walls. Determine how many rafters you ll need for the roof. A simple rafter roof consists of rafters that the rafter foot rest on horizontal wall plates on top of each wall. Simple roofs such as a shed or the common gable are fairly easy to construct even without plans if you understand the basics and a little geometry.

Framework of all roofs are called rafters. The tops of the inclined rafters are fastened in one of several ways determined by the type of roof. They vary in size depending on their length and spacing. They do for the roof what the joists do for the floor and what the studs do for the wall.

Roofs are framed in five basic designs. Other roof protrustions sothat notiiing obstructs tiieflow ofair from eave to ridge. The ridge board is non load bearing and merely provides the point of connection for the opposing rafters and is only a nominal 1 thick. The function of each component is.

Cold roof insulation between rafters wnapor barrier on warm side below orw sheatiiing roofing roofing 2 x 8 sleepers notched for vent aligned wi rafters flashing over rooang fascia sheatiiing 2 x 4 sleepers aligned w rafters provide. The support system for the roof is comprised of ridgepole and rafters or purlins. For most load bearing requirements a roof truss will need to be placed every two feet along the walls. The top ends of the rafters often meet at a ridge beam but may butt directly to another rafter to form a pair of rafters called a couple.

A rafter tie is a horizontal tension tie that is located in the lowermost third of the span of a pair of opposed sloped or gable roof rafters. The app graphically shows the detail. A rafter tie resists spreading of the building walls by bulges at the wall top that would otherwise occur due to roof loads. Rafter calculator mobile is accurate fast and offers an abundance of features makes life easier for everyone involved in a project for building a roof.

Piece by piece rafter roof construction however is still the more common construction method for many buildings.