Roof Sheathing Thickness Ontario

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. 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.

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The ontario building code thickness or rating.

Roof sheathing thickness ontario.

Never attach roof sheathing with staples. That in a nutshell is the one big advantage plywood holds over osb. Cgsb ca cgsb 37 54 polyvinyl chloride roofing and waterproofing membrane national building code of canada 2005. Loads will vary with the pitch of the roof.

1 inch 25 4 mm. Installation details shall conform to sections 2304 7 1 and 2304 7 2 for floor and roof sheathing respectively. 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. Most roofs will be sheathed in plywood at least 3 8 inch thick.

Ontario building code wall sheathing requirement. 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. The ontario building code thickness rating and material standards 9 23 16 2. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads.

Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of section 2304 7. 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. The typical thickness range for sheathing is 3 8 to 3 4 inch. Plywood s advantage over osb.

For sub floor s. 8d ring shank nails should be used instead.

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