Foam Board Exterior Sheathing at Exterior

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Foam Board Exterior Sheathing. Rigid foam board sheathing installation comes in at around $2.50 a square foot for material and labor costs. I have found a good deal on used 4 rigid foam insulation boards, which is considerably cheaper than using new.

Johns Manville AP™ FoilFaced Foam Sheathing
Johns Manville AP™ FoilFaced Foam Sheathing from www.builtgreencanada.ca

The exterior is going to be a layer of rigid foam insulation which will be completely sealed, forming a vapour barrier (vapour barriers should be on the outside (warm side) in a cold storage situation). The death of the 8’ sheet… one of the biggest items when sheathing a wall vertically is that the sheathing has to be continuous (602.10.4 &.5) which meant that an 8’ sheet wouldn’t cut it in many places so longer ones were required. Sheathing is the board or panel material used in floor, wall and roof assemblies of both residential and commercial construction.

Johns Manville AP™ FoilFaced Foam Sheathing

The death of the 8’ sheet… one of the biggest items when sheathing a wall vertically is that the sheathing has to be continuous (602.10.4 &.5) which meant that an 8’ sheet wouldn’t cut it in many places so longer ones were required. Detail would include 2x6 top and bottom plates with 2x4 studs to allow inset 2 of exterior foam board. I don’t know about other areas, but in just the last few years builders have been sheathing walls with foam board (with intermittent osb/ply) instead of sheathing the entire exterior walls with osb or ply. Because of its correlation to structural integrity, it is important to take wall sheathing materials and methods into consideration when planning a new home build or remodel.