Metal Roof Rafters Spacing

All purlin joints must be supported by a rafter.

Metal roof rafters spacing.

Z purlins are connected to the rafters using cleats. Usually 400 450 or 600mm but any value can be used up to 610mm max. Joined jan 6 2007 1 343 posts. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center.

This is the distance between rafter centres. Purlins provide horizontal support for the sheets and form part of the framework for the building. Minimum recommended purlin size is 4 x 2 50mm x 100mm in timber or z140mm x 1 6mm in steel. The most common measurement used for rafter spacing is either 16 or 24 inches.

These standards are as follows. This is most likely the standard size that you will find on pre made roof trusses. Also important to note here is that a two inch in a. 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.

Clear span on plan. A metal roof must also allow for some overlap on each side of the panels which will reduce the effective width of the panel. Typical roof truss spacing means that they are usually about 24 inches from centre which means at the centre of one truss there will be a two foot gap or twenty four inch gap until the centre of the next truss. Rafter spacing for metal roof.

Discussion starter 1 jun 2 2017. Roof pitch between 15 and 22 5 degrees with rafter spacing strength class c16 size of rafters in mm 400mm 450mm 600mm. In addition each roofing truss will be made of a two by four piece of lumber or in areas with expected or usual heavy snow fall there will be trusses which are two inches by six inches. So the space between rafters can be greater without reducing the maximum span.

The full version allows any size. I m installing 36 exposed fastener steel panels on a treehouse. Rafter slope min 15 max 45 degrees. Determining rafter s spacing is as important as setting the metal roof purlins spacing.

Wider panels allow for greater spacing between rafters. Typical standard the typical standard for the spacing on the roof trusses is 24 inches. You have to take the width of your roofing panel into the considerations. As most building these days are using those pre made trusses on the roof 24 inches become the main size for any roofing construction when it comes to its truss installation.

Common spacing for trusses on this type of building is often between 2 and 4 feet but trusses built with advanced designs may allow spacing as great as 8 or 12 feet.