Helpful? 0

Internal Insulation of Masonry Walls

I am renovating an Brick Home in Toronto. The exterior walls are Load bearing brick walls with some parging, furring, and plaster board. I want to add insulation on the interior using the wall assembly described on page 24 of the pdf guide "Internal Insulation of Masonry Walls: Final Measure Guideline" see below for URL. I have a question about this assembly... I noticed that there is no vapour retarder, should I install a vapour retarder on the warm side of the insulation between the insulation and the wood studs?

Also, would you recommend that I fully remove the existing furring and plaster board before added the new insulation assembly?

http://www.buildingscience.com/documents/reports/rr-1105-internal-insula...

Thanks for any help.

Asked by david lam
Posted Mon, 01/14/2013 - 01:34

Tags:

1 Answer

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

David,
You'll notice that the experts at Building Science Corp. recommended the use of "semi-permeable rigid foam" -- for example, expanded polystyrene (EPS) -- for this detail. The reason that they specified semi-permeable foam is that it is desirable for this assembly to have some ability to dry to the interior. That's why you don't want to include an interior vapor barrier here. (The rigid foam is already a vapor retarder, but it isn't a vapor barrier.)

Whenever you insulate a multi-wythe brick building on the interior, it is essential to install the insulation directly against the bricks, with no intervening layers or air spaces.

For more information on these issues, see Insulating Old Brick Buildings.

Below is the detail under discussion.
.

Brick building with interior insulation.jpg
Answered by Martin Holladay, GBA Advisor
Posted Mon, 01/14/2013 - 08:57

Other Questions in Green building techniques

Enclosed room on slab

In Energy efficiency and durability | Asked by Jason Schatz | Oct 16, 14

“Air-sealed” can light retrofit vs. Tenmat cover in attic?

In Energy efficiency and durability | Asked by andrew c | Jun 22, 14

Thermal energy storage

In Green building techniques | Asked by Jim Pancanke | Oct 21, 14

What is the best ventilation system for a passive design cafe/restaurant?

In PassivHaus | Asked by monita taghva | Oct 20, 14

Insulation dew points and archaic insulation

In GBA Pro help | Asked by Graham Allan | Oct 20, 14
Register for a free account and join the conversation


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