Roof Sheathing Thickness Ontario

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.

Roof sheathing thickness ontario.

Plywood s advantage over osb. The ontario building code thickness rating and material standards 9 23 16 2. Cgsb ca cgsb 37 54 polyvinyl chloride roofing and waterproofing membrane national building code of canada 2005. Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of section 2304 7.

That in a nutshell is the one big advantage plywood holds over osb. The ontario building code thickness or rating. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. Loads will vary with the pitch of the roof.

For sub floor s. Most roofs will be sheathed in plywood at least 3 8 inch thick. 1 the thickness or rating of roof sheathing on a flat roof used as a walking deck shall conform to either table 9 23 14 5 a. Ontario building code wall sheathing requirement.

8d ring shank nails should be used instead. 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. Installation details shall conform to sections 2304 7 1 and 2304 7 2 for floor and roof sheathing respectively. Sheathing should be a minimum of 19 32 inch thick.

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. 1 inch 25 4 mm.