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speede5 · 09-05-2021, 01:11 PM

I've done it twice, hard to say if it was really worth it, both were older homes and had so many leaks it was hard to make a drastic improvement. You have to be careful and consider the entire homes insulation as a system, Adding a layer of rigid to the exterior and taping it all up can create a moisture trap inside the walls as you are changing the way they breathe, particularly on an older home with substandard vapour barrier.

I would also say it is only worth it if you can add 1.5-2", which can create a lot more work around openings. If you are just adding a thin layer it's pretty pointless as far as work/reward. A good layer of house wrap will cut down on the effect of wind but not seal the walls up trapping moisture.

09-05-2021, 01:11 PM	#4032
speede5 First Line Centre Join Date: Sep 2009 Exp:	I've done it twice, hard to say if it was really worth it, both were older homes and had so many leaks it was hard to make a drastic improvement. You have to be careful and consider the entire homes insulation as a system, Adding a layer of rigid to the exterior and taping it all up can create a moisture trap inside the walls as you are changing the way they breathe, particularly on an older home with substandard vapour barrier. I would also say it is only worth it if you can add 1.5-2", which can create a lot more work around openings. If you are just adding a thin layer it's pretty pointless as far as work/reward. A good layer of house wrap will cut down on the effect of wind but not seal the walls up trapping moisture.