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Posted By

GLENDA MCCARTHY (Livermore, CA)

Category

General Contractor

Posted Date

3/9/2018 12:00:00 AM

Forum Title

Canada, ND, MN Area - Adding Insulation To Exterior Of Home - Discussion

Common practice in these parts is to add 1-1/2 Cladmate insulation to the exterior of an older home (when residing), in an attempt to increase R-value. Quote: STYROFOAM* CLADMATE* and STYROFOAM CLADMATE XL extruded polystyrene insulation are designed for use in walls and attics of new and retrofit applications. They reduce thermal bridging by insulating the entire wall including the wood studs. This decreases the potential for condensation within the wall cavity that can lead to moisture problems in the walls. The boards (over .5) have shiplapped edges that reduce air infiltration. STYROFOAM CLADMATE and STYROFOAM CLADMATE XL extruded polystyrene insulation meet the 1995 National Building Code's air permeance properties that make them suitable for use as an air barrier material. The bolded line concerns me. I assume they are talking about condensation within the wall cavity that comes from the EXTERIOR of the home. Most of these old homes are built like this: (starting from the outside) Wood siding (which is removed) Tar paper. 3/4 T&G boards (shiplap) 2x4 studs 3/4 T&G boards (shiplap) Interior finish (no poly vapour barrier) - often lath and plaster or drywall with several coats of oil paint (essentially a vapour barrier)My concern is this:Would you be concerned about trapping moisture in the wall as a result of adding insulation to the exterior of the home (a home without an actual vapour barrier)? I'll try to add another link here later when I have time to look for it. Should be an interesting discussion.
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