How Far Apart Rafters For Rib Steel Roofing

As the o c spacing gets larger the trusses have to carry more weight and be built heavier.

How far apart rafters for rib steel roofing.

With traditional stick frame construction the trusses are usually spaced 2 feet apart. Therefore if you want a 10 12 single sloped roof and you live in a heavy snow area then you can space your rafters 16 apart and use spf 2 6 lumber. This is not a complete install only basic install on a bungalow i. Truss spacing for metal roof just remember you can t use the same trusses for 24 48 or whatever centers.

We do recommend it however. Pole barn construction spaces the trusses 8 feet apart or even up to 12 feet apart depending on the building design. Metal roof purlins are installed horizontally under metal roofs. They give added support to the roof and also provide a nailing surface for the end panels and drip edge.

To determine how far apart to set rafters measure the width of the metal panel and then the width of the first hill and valley of the panel. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. This translates to seven rows of strips 20 feet long spaced two feet apart or 140 lineal feet of. Do all roofing projects require purlins.

In this example the section of roof is 20 feet wide and 14 feet from the fascia to the peak. Purlins are 2 by 4 feet and are installed much like metal roofing. Metal roofing is a unique trend in roofing and this guide will walk you through the steps including how to install metal roofing over shingles. You should use 2 4 rafters if you live in an area without heavy snow or wind loads.

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. In this video i m installing some metal roofing over an existing ash fault shingled roof. They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top. Install the roofing screws vertically along each rib in the panel.

Wider panels allow for greater spacing between rafters. Place the first screw about 7 inches from the bottom and each subsequent screw about 18 to 24 inches apart along the vertical run.