Some steel shingles and tiles have a baked on granular coating that adds to their thickness and the mra notes that those products are usually made from 26 gauge steel.
Standard roof thickness uk.
Standard roof sheathing which consists of 4 by 8 sheets of plywood or oriented strand board or osb is 1 2 inch thick and attaches directly to the roof rafters or the roof trusses.
For the curious 7 16 osb has a span rating of 24 16 and with supports every 24 inches is good for a roof live load of 40 psf pounds per square foot with a 10 psf dead load.
For example standard 29 gauge steel roofing made in long panels is about 0 36 millimeters thick and the 26 gauge version is slightly thicker at 0 48 millimeters.
For heavier loads a 40 20 rated panel 19 32 or 5 8 will support a 130 psf live load and 48 24 rated panels 23 32 or are good to175 psf.
Please understand that recommended metal thicknesses will vary based on the design and engineering of the metal product being considered that said here are a few general recommendations.
The thickness required by josh s circumstances are good for roof snow loads of up to 70 psf again spanning 24.
It will support roof.
Tips for installing metal roofing accessories.
All the figures are based on roofing tiles or slates laid on timber laths over sarking felt.
How to prepare for metal roof installation.
So while metal thickness is not the key consideration when buying a metal roof and some folks will try to fool you on metal thickness i understand the concern.
This sizing guide for roof rafters will help determine what you need for your small project.
The gauge of a metal roof refers to its thickness and the higher the gauge the thinner the metal.
An exception to this standard however may occur if you intend to install slate concrete or tile shingles on your roof.
There are several variables to consider when determining the proper rafter size.
For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended.
Metal as the preferred material for self storage facilities.
The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that.
Weather you re building a shed roof or adding a dormer to your second story it is important to choose the proper size rafter.
