They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top.
How far apart rafters for rib steel 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.
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.
Wider panels allow for greater spacing between rafters.
Pole barn construction spaces the trusses 8 feet apart or even up to 12 feet apart depending on the building design.
They give added support to the roof and also provide a nailing surface for the end panels and drip edge.
As the o c spacing gets larger the trusses have to carry more weight and be built heavier.
In this video i m installing some metal roofing over an existing ash fault shingled roof.
The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to.
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.
Install the roofing screws vertically along each rib in the panel.
Truss spacing for metal roof just remember you can t use the same trusses for 24 48 or whatever centers.
A metal roof must also allow for some overlap on each side of the panels which will reduce the effective width of the panel.
For instance the material is used in roofing might be slate and that will mean that the roof trusses are built with different spacing and different material than for instance the material and how far to space roof trusses if you had say an aluminum roof.
We do recommend it however.
In this example the section of roof is 20 feet wide and 14 feet from the fascia to the peak.
Do all roofing projects require purlins.
This is not a complete install only basic install on a bungalow i.
With traditional stick frame construction the trusses are usually spaced 2 feet apart.
You should use 2 4 rafters if you live in an area without heavy snow or wind loads.
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.
Purlins are 2 by 4 feet and are installed much like metal roofing.
Should i use 2 4 or 2 6 rafters for shed roof.
