Using Wood Purlins For Metal Roof

Purlins are usually supported by rafter building walls or the weight of the roof deck itself.

Using wood purlins for metal roof.

As an added bonus purlins increase the structure s resistance to strong winds. Purlins are 2 by 4 feet and are installed much like metal roofing. Tin roofing also known as metal roofing is considered more durable than composition or wood shingles. Dead load will be the actual weight of the roof steel and the roof purlins.

They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top. Wood framing employs decking to tie roof trusses together and support the roof. Installing wood stripping under a tin roof. Decking is heavy and expensive.

The roofing is manufactured in panels that. They give added support to the roof and also provide a nailing surface for the end panels and drip edge. For sake of discussion we will assume a minimal roof snow load of 20 psf pounds per square foot and a 4 12 roof slope. There are two ways to do this put in firring nailing though nails are not used any more for this strips or purlins in steel frame construction on the roof to support it or place the metal roofing directly on a flat surface like foam insulation board or the roof sheathing with roof water barrier in the correct position in the layer.

To know more about it read the following passage below that explain it into details. For many applications a layer of plywood underneath your metal roofing is an unnecessary expense. We do recommend it however. Do all roofing projects require purlins.

Metal roofing panels rated for architectural use attached to purlins horizontal pieces of wood or metal fastened to roofing trusses are structurally sound when installed according to your roofing manufacturer s instructions and local building codes. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. The cos of the purlin spacing is because the load on the purlins is vertical and the purlin spacing is with the run of the roof. Thirdly purlins add additional support between the spans of the individual framing bays.

Metal roof purlins are installed horizontally under metal roofs. It is also time. Compared to conventional roofing system it might be a bit pricier in terms of installation but also has longer durability to provide better value for the future. Metal building purlin spacing.