0 Helpful?

Why no "ridge vents" for walls?

I've been thinking about wall insulation vs. attic insulation. Why is it that ventilation is not needed in wall assemblies using fiberglass or cellulose insulation in the same way that it is needed for roof assemblies. I certainly know this is true, but discover I'm not clear on the science behind it. For old 2x4 walls, I think it might be because the insulation is thin enough so the dew point isn't reached within the assembly. But what about double stud walls and other higher insulation assemblies?

Asked by Hallie Bowie
Posted Jan 10, 2013 3:37 PM ET
Edited Jan 10, 2013 3:59 PM ET

Tags:

1 Answer

Select your preferred way to display the comments and click "Save settings" to activate your changes.
1.
0 Helpful?

Hallie,
The short answer to your question: if you are building a double-stud wall, you should definitely include ventilation. The ventilated air gap between the siding and the wall sheathing is usually called a rainscreen gap.

I have been recommending the practice for thick walls for some time; for example, see How Risky Is Cold OSB Wall Sheathing?

Answered by Martin Holladay, GBA Advisor
Posted Jan 10, 2013 3:58 PM ET

Other Questions in Energy efficiency and durability

Adding A/C to 1918 built home

In Mechanicals | Asked by Brian Forney | Jan 31, 15

Freeze risk for a heat pump water heater in an unconditioned garage

In Mechanicals | Asked by Nathaniel G | Jan 31, 15

Closed cell or open cell foam for rim joist in Climate zone 5A

In General questions | Asked by Gary Brod | Jan 31, 15

Radiant floor vs. minisplits?

In General questions | Asked by Clayton Hufford | Jan 29, 15

Does code require fireproof caulk around electrical boxes & light switches?

In Building Code Questions | Asked by Robert Hallenbeck | Jan 31, 15
Register for a free account and join the conversation


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