Roof Sheathing Thickness For Metal Roof

Cdx works fine in 1 2 or 5 8 thickness.

Roof sheathing thickness for metal roof.

Many metal roofing dealers specify minimum of 7 16 sheathing. Most roofs will be sheathed in plywood at least 3 8 inch thick. Metal roofing roofing answers roofing installation roofing materials oriented strand board commonly referred to as osb is a type of engineered lumber similar to particle board formed by adding adhesives and then compressing layers of wood strands. Each gauge represents a nominal decimal range.

It s the standard for spacing of 24 inches in the rafter although as mentioned a 5 8 inch thick is more ideal. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. The typical thickness range for sheathing is 3 8 to 3 4 inch. 8d ring shank nails should be used instead.

And you b don tneed to sheath the roof the difference in price between a 4x8 sheet of osb or ply and 8 pieces of 1x4x8 for exmple is big. The time saved in humping edless 4x8 sheets up onto the roof nailing them off and creating staging areas to work from is b huge as you install the strapping purlins at 24 oc you are creating a. Shake and shingle panels. Keep the 16 oc go with 1 2 osb and add an extra clip in each space.

A half inch thickness is considered to be standard in a lot of areas and it should work just fine considering that it s deemed okay by the roofing contractor after considering the things above. Never attach roof sheathing with staples. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. Exposed or hidden fasteners.

April 3 2017 filed under. Panel or tile system. Design depends on type of metal roof. Sheathing should be a minimum of 19 32 inch thick.

Manufacturers express the thickness of metal panels as their gauge with 22 gauge being the thickest and 29 gauge the thinnest of traditionally sold metal roof and wall panels. I ve never used commodity osb on a roof but it s probably fine in 5 8 thickness and possibly in 1 2 thickness. Board and batten pan and ridge panels. Malcolm i almost always use 5 8 zip sheathing on roofs and metal roofing installers have never questioned it.

140 wind speed mph 150 mph 160 mph minimum sheathing thickness inches exposure b 7 16 24 16 15 32 32 16 19 32 40 20 minimum sheathing thickness inches panel span rating exposure c 19 32from asce 7 40 20 19 32 40 20 19 32 40 20. Lets pretend the roof design details are conventional and so the roof deck sheathing will be 5 8 to 3 4.