0 Helpful?

Moisture where ceiling and walls meet on exterior walls

Hi I recently read a article on here talking about my exact problem and that someone had did a study to fix it , I was having trouble completely understanding if the three things they did worked at all? One was insatlling 6 inch insulated crown moulding in the interior of the house. I can't find it for sale anywhere and I read another article that some guy used 6 inch mdf crown moulding and drilled holes in it and sprayed great stuff into it but he never said if that fixed his issue or not. Also my entire soffit is ventilated I was wondering if I closed off some or all during the winter if that would help with my problem. I've added insulation 2 times to my attic and tore down the soffit and installed 2 inch foam insulation on the osb sheating above the soffit, I run dehumidifiers in the winter both those seemed to help a lil but I still see in bubbling up the ceiling paint and running down the walls, please help Any info would be great. Thank u

Asked by Patrick Conry
Posted Dec 8, 2016 2:43 AM ET


1 Answer

Select your preferred way to display the comments and click "Save settings" to activate your changes.

Here are links to two previous threads on this topic:

Interior insulated cornice for use under low-heel roof trusses?

Weird top-plate area idea

As those two threads make clear (and as my original article in Energy Design Update also made clear), the idea of the insulated crown molding doesn't work and isn't worth pursuing. The researchers expressed the opinion that the only solution that really works is a "chainsaw retrofit" job that includes new rigid foam on the exterior side of the wall sheathing and roof sheathing.

Most homeowners can't afford that work, so they get by with halfway measures like the ones you are suggesting: air sealing work, the use of two-component spray polyurethane foam in the attic at the critical area, and conscientious use of exhaust fans and (in some case) a dehumidifier to lower indoor relative humidity.

Answered by Martin Holladay
Posted Dec 8, 2016 6:25 AM ET
Edited Dec 8, 2016 6:27 AM ET.

Other Questions in Webinar Follow-up Q&A

Thoughts on negative pressure after balancing a Venmar X24 ERV?

In Mechanicals | Asked by David Goodyear | Jul 20, 18

Insulation retrofit

In General questions | Asked by User-7117614 | Jul 22, 18

Raised floor insulation and foam-sheathed walls

In Green building techniques | Asked by User-7124491 | Jul 22, 18

Looking for options: concrete pad detail

In General questions | Asked by tech1234 | Jul 22, 18

How long for interior to dry out?

In General questions | Asked by Peter L | Jul 22, 18
Register for a free account and join the conversation

Get a free account and join the conversation!
Become a GBA PRO!