Comments on: Does Your Water Resistive Barrier Really Resist Water?

By: Allison Bailes

Allison Bailes — Tue, 21 Jun 2016 01:14:04 +0000

Great question, Dennis. WRB
Great question, Dennis. WRB manufacturers make special versions of their products for open-joint cladding of the type you describe. If you download the articles, you'll find that the authors of this study looked at that type as well, although I didn't discuss that part in my article.

By: Dennis

Dennis — Tue, 21 Jun 2016 00:50:32 +0000

So even when WRB-covered
So even when WRB-covered walls get quickly clad with siding, is there any continued danger of UV deterioration when siding is not continuous, but panels / boards with open joints? Those gaps are narrow but would still expose WRB to periodic sunlight - continuously through the life of the building? Curious what the experts think about this matter!

By: John Edgar

John Edgar — Fri, 29 Apr 2016 04:07:28 +0000

UV is one aspect but 'blowing
UV is one aspect but 'blowing in the breeze' is another. The longer house wraps are exposed to UV the more likely they are to be damaged and torn. This coupled with the idea that house wraps are also are expected to act as flashings (details show window flashing terminating on the house wrap) leads to future problems.

By: Allison Bailes

Allison Bailes — Wed, 13 Apr 2016 18:24:32 +0000

If you download the paper
If you download the paper that I linked to at the end of the article, you'll see this on page 7: "Beaumier [12] established a relation between the UV index and the irradiance of accelerated aging using Xenon-Arc lamp, according to ASTM G155, cycle 3 [23]."

By: Joseph Mellott

Joseph Mellott — Wed, 13 Apr 2016 17:31:01 +0000

The third table states the
The third table states the correlation between accelerated UV exposure and "real world" exposure. I am curious as to the basis of this correlation. Does this come from another study or stated standard?

By: Andrew C

Andrew C — Thu, 07 Apr 2016 02:16:49 +0000

Great test, obviously it
Great test, obviously it leads to other questions and more testing. And with David Eakin, I’d love to see liquid-applied WRBs tested. From the very little I’ve seen, the liquid-applied will win this contest.

The data is interesting, but the graph labels are…confusing. If something remains unchanged, shouldn’t it be 0% change, not 100%? Maybe it’s me…

By: Tad Englund

Tad Englund — Wed, 06 Apr 2016 23:57:21 +0000

Dale, I've remodeled some
Dale, I've remodeled some older homes that the felt looks just like it did the day it was applied (in Seattle). I think just like described above, the installer has a lot to do with how it functions. Of course this is not a discussion about the merits of felt, I just wanted to see if the test had a base line to judge from. Felt would have been a good base line.

By: David Eakin

David Eakin — Wed, 06 Apr 2016 21:49:18 +0000

Inquiring minds want to know
Inquiring minds want to know - brands/products. Without the brand/product info, this is just scare tactics by C-D. No real guidance on what to avoid or protect if used. Also would be good to see how the liquid-applied WRBs faired, and the "green OSB" system.

By: Dale Kruse

Dale Kruse — Wed, 06 Apr 2016 20:16:23 +0000

Felt dries out, gets torn,
Felt dries out, gets torn, and smells bad in my experience

By: Tad Englund

Tad Englund — Wed, 06 Apr 2016 19:54:22 +0000

I would be interested to see
I would be interested to see how good old 15 lb felt would stand up next to the other products. Or am I missing something?