Using Wood Purlins For Metal Roof

Purlins are non pressure treated 1 x 4 x 12 lumber that is installed on to the roof in a specific layout pattern and screw pattern.

Using wood purlins for metal roof.

We do recommend it however. Metal roof purlins are installed horizontally under metal roofs. 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. Do all roofing projects require purlins.

Purlins are usually supported by rafter building walls or the weight of the roof deck itself. 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. Metal building purlin spacing. Thirdly purlins add additional support between the spans of the individual framing bays.

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. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. Tin roofing also known as metal roofing is considered more durable than composition or wood shingles. Wood framing employs decking to tie roof trusses together and support the roof.

As an added bonus purlins increase the structure s resistance to strong winds. It is also time. Metal roofs are often referred as tin roofs in the past because of the use of tin such as aluminum or stainless steel sheets as the materials. 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.

Dead load will be the actual weight of the roof steel and the roof purlins. The roofing is manufactured in panels that. They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top. Purlins are 2 by 4 feet and are installed much like metal roofing.

To know more about it read the following passage below that explain it into details. They give added support to the roof and also provide a nailing surface for the end panels and drip edge. 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. Decking is heavy and expensive.