Roof Sheathing Thickness Ontario

Plywood s advantage over osb.

Roof sheathing thickness ontario.

Most roofs will be sheathed in plywood at least 3 8 inch thick. 8d ring shank nails should be used instead. Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of section 2304 7. Our 20 yr old house has no sheathing except on the roof single storey 1600 sqft bungalow usual windows and doors 6 12 combo gable and cottage roof typical 20 yrold construction around here walls are 2 by 4 plus sm outside then vinyl siding the usual letin steel diagonal bracing on the.

For sub floor s. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. Sheathing should be a minimum of 19 32 inch thick. The typical thickness range for sheathing is 3 8 to 3 4 inch.

1 inch 25 4 mm. Loads will vary with the pitch of the roof. Installation details shall conform to sections 2304 7 1 and 2304 7 2 for floor and roof sheathing respectively. Cgsb ca cgsb 37 54 polyvinyl chloride roofing and waterproofing membrane national building code of canada 2005.

Never attach roof sheathing with staples. Division b part 5 page 5 11 the national building code now dictates that all flat roof deck and balcony areas are considered roofs and when specifying a pvc. Panel thickness will also affect permeability using the 2 perm variable of 7 16ths osb sheathing at 3 4 thickness the permeability drops to 2 3rds of a perm. The ontario building code thickness or rating.

Ontario building code wall sheathing requirement. That in a nutshell is the one big advantage plywood holds over osb.