1 you said some metal roofing should never have firring strips i have certainly seen that with some of the very thin steel or weak aluminum decking which could never stand even a foot of free span over firring strips without crumpling buckling under someone walking on it so they would have to lie flat on the water barrier over the sheathing.
Furring strips under metal roof.
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.
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An affordable option and easier to lay than shingles tin is the most commonly used type of metal roofing.
Let s take a look at the most common types of metal roofs for houses.
Furring strips are required if you plan to place a metal roof on top of existing shingles.
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Metal roofs depend on thin strips of wood known as furring to allow air to circulate and prevent rot.
Or installing the new metal roofing over furring strips 1 x 3s or similar will raise the metal and provide a ventilating air pocket between layers.
If trapped between the metal roofing and old roofing moisture can build up and cause mold and rot.
If you opt to put the metal roof atop current roof shingles it needs to be done in combination with a synthetic underlayment recommended.
Spacing of furring strips for metal roof when installing a metal roof over an existing roof insulate the spaces between the wood strips with rigid insulation to prevent condensation before.
But roofers can install a vented metal roof that eliminates this potential problem.