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.
Spacing on 1x4 for metal roof.
See page 6 for more information on screw spacing and ordering.
A metal roof must also allow for some overlap on each side of the panels which will reduce the effective width of the panel.
Correctly measure the spacing of furring strips for a metal roof to further decrease condensation.
Whether you are looking to install a metal roof on a shed or a house it s important to know the difference in the various types of metal roofs available.
The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to.
Do all roofing projects require purlins.
We do recommend it however.
An affordable option and easier to lay than shingles tin is the most commonly used type of metal roofing.
The 1x4 s are usually applied right over the shingles once the sheeting and shingles overhangs are cut off.
Some contractors feel that 7 16 osb roof decking is a poor choice for the supplied screws preferring the solid 1x4 s.
For longer slopes and lower roof pitches contact fabral for other suitable profiles.
Twenty four inches is a common spacing of furring strips for a metal roof.
Roof pitch the metal roofing panels shown in this manual require a mini mum slope of 2 per foot to ensure proper drainage.
Metal roofing source grand rib 3 multi purpose classic rib grand rib 3 panels are a strong durable economic and attractive answer to the growing demand.
If an open grid framed roof or widely spaced old solid roofing planks as the sheathing it is important to tightly stretch this so it does not sag down and hold water between the framing roof sheathing boards and the metal roofing obviously far better to put down a solid sheet sheathing first when doing a reroof in that sort of situation.
Wider panels allow for greater spacing between rafters.
Trim the most common flashing for metal roofing is the ridge cap which is used at the peak of a roof.
Refer to the rain carrying table in this booklet for the maximum allowable panel length per slope that will provide adequate drainage.
