0 Helpful?

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 badboi
Posted Jan 14, 2013 12:34 AM ET

Tags:

1 Answer

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

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 user-756436
Posted Jan 14, 2013 7:57 AM ET

Other Questions in Green building techniques

SIP roof issues

In General questions | Asked by Matt Melton | Feb 17, 17

How do I insulate an already framed concrete wall?

In Energy efficiency and durability | Asked by Scott Thompson | Feb 10, 17

How to get notifications from comments

In General questions | Asked by Gerald Pehl | Feb 19, 17

Sealing under-layers of built-up exterior foam panel insulation

In Green building techniques | Asked by Gerald Pehl | Feb 19, 17

Passive house exterior door for reasonable price?

In Green products and materials | Asked by Matthew Michaud | Feb 4, 13
Register for a free account and join the conversation


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