Flat Roof Decking Thickness

The typical thickness range for sheathing is 3 8 to 3 4 inch.

Flat roof decking thickness.

Tuff clad pvc metal flashing. Loads will vary with the. Sheathing sizes osb and plywood come in thicknesses ranging from 5 16 to 3 4 inch and the thickness needed for a particular roof depends on several factors including rafter spacing expected load. Keep in mind that the load of the roof still plays a role in the plywood thickness.

This way no worrying about grabbing scraps to fill in small spots and not having the correct thickness. Another issue that many people encounter is what size plywood the roof may need. Sheathing should be a minimum of 19 32 inch thick. When using this type of deck in conjunction with bonded vapour control layers it will be necessary to first install a random nailed isolating layer prior to the installation of the main roofing system to cover the joints between adjacent boards.

What size plywood for the roof. Timber boarding suitable for roof decks should be a minimum 19mm nominal thickness planed and closely clamped together tongued and grooved or closely butted. Osb roof decking thickness 7 16 1 2 or 5 8 if were using osb we get 9 16 we dont worry about getting both 7 16 and 9 16 for walls then the roof we just get all of the same. The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process.

Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. 8d ring shank nails should be used instead. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. Waterproof decking for flat roof decks need to be walkable and nice to look at.

Call toll free 1 877 860 9333. 8am to 4pm pst. A flatter roof with rafters farther apart may need a thickness of up to inch. Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick.