Hip Roof Framing Purlins

The procedure for the erection of a simple hip roof.

Hip roof framing purlins. Bernd s drawings of the witches cut on the pent roof hip rafter is easy to follow. A disadvantage of the hip roof is that it is more difficult to construct than a gable roof. The interlocking design of the ahep allows it to install linearly aligned with the end jacks to maintain framing spacing from eave to hip or peak. Intersecting the intersecting roof consists of a gable and valley.

As well as the jack rafter claws. The purlins are supported by vertical or slightly angled bracing. The procedure for the erection of a simple hip roof. Roof sheathing decking attaches directly to the purlin with knurled pneumatic fasteners or low profile head self drilling screws.

Purlin lip cut angle 11 4. When rafter spans are too great a purlin is introduced to break the span by transferring the loads to gable walls or in this case to the hip rafters. In small roofs purlins are inserted between the rafters and nailed through the rafters. The purlins are therefore carrying half of the roof load and yet the load transfer is only through one third of the timber plus the mechanical fixing of one clout nail.

Purlins purlins on a roof frame serve the purpose of preventing rafters from being over spanned and sagging. These hip rafters run at a 45 angle from each corner of the building to the ridge. Outside top plate edge to ridge top edge common 10 11 3 4. He shows two ways of developing the hip rafter bird s mouth on the canted purlin and two methods should be drawn to make sure each of the methods produce the same results.

Purlins purlins are used in roof construction to support corrugated sheet metal if it is used or to support the sheathing of roofs framed with trusses. In large buildings where heavy trusses are used the purlins are continuous members that rest. With a square roof the ridge becomes a square center piece kingpost with side lengths equal to common rafter thickness. Hip roof framing center join diagram with options for square roof 1.

Roof framing geometry monday december 1 2014. Purlins are placed under rafters in a perpendicular position on edge not flat.