Sheathing Thickness For Metal Roof

In order to avoid a hump at the transition from two layers of materials to one the notation on the building plans advises to lower the roof purlins in these areas by 7 16.

Sheathing thickness for metal roof.

1 inch 25 4 mm. Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. Because 22 24 or 26 gauge sheeting is thicker and will therefore remain more structurally sound over a longer span than a 29 gauge the building needs fewer supports which saves your customers money. Roofs with very heavy loads may require 3 4 inch thickness.

This minimum will only work if the rafters are set 16 inches apart at most and if the roof doesn t have too much load. Zip system roof assembly combines our revolutionary integrated sheathing and flashing tape or liquid flashing to provide a sealed roof for protection against moisture intrusion during construction or if high winds strip the roof covering away. A strong resilient roof is a home s first line of defense when the roof deck is exposed to weather. Post frames generally lack structural sheathing so the roof and wall panels must span between the supporting trusses or purlins.

Then the top of all your purlins once osb under metal roof panels is placed will be in the same plane and the roof steel will lay flat. Table 2304 7 1 allowable spans for lumber floor and roof sheathing a b for si. Structural floor sheathing and structural roof sheathing shall comply with sections 2304 7 1 and 2304 7 2 respectively. Mike the pole barn guru.

Is osb acceptable as roof decking for metal roofing. Sheathing should be a minimum of 19 32 inch thick. It will support roof loads for most situations and is the standard for most roof applications. That s considered to be the minimum.

Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame.