Why is there moisture in the walls of my REMOTE wall construction?

D
David Perreault
Updated: April 8, 2025

Hello

I finally built my shop! The final construction is gyproc, furring, r15 batts, 2x6, osb 1/2, membrane blueskin vp160, 2 sheets of 4inch EPS foam (total of 8 inch), furring, siding.

I put Lunos for air exchanger.

But I noticed some issues lately. I checked the osb under the batts and in some areas, it is humid. I checked the humidity level of the room and it is high (around 60%).

For context, I started the glycol heating around 2 weeks ago and the air exchanger just 2 days ago. I am hoping to decrease the level of humidity with the Lunos and I will add a dehumidifier also.

My plan is as follow: I will try to decrease the humidity level of the room to an acceptable level (like 40%) and see the effect on the osb. If it is still a problem, I will remove the batts and live with only the foam insulation outside.

I would like to know what you think about all that.

All the best

David

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