WRB / Discussions

Where should I put an air barrier on a log home insulated from the outside only?

...WRB (as sealed as possible), then another layer of continuous rockwool board, followed by an air gap with diagonal furrings. Then we will attach vertical wood siding. Is this a good plan? Is the location for the air barrier right? To clarify - a post and beam home (timber frame) would have support posts with wall openi...

Posted by Geneviève Rock Dec. 5, 2025 Air and vapour barriers 1 response

Which house wrap is best?

I am installing pine tongue and groove exterior siding. Which type of house wrap is best, perforated or non perforated (like Tyvek).  Thank you Every exterior weather barrier house wrap like Tyvek is intended to be breathable and let moisture pass though it, and you can usually find permeability rates listed on the man...

Posted by Kathy Moller Aug. 2, 2020 Air and vapour barriers 1 response

What is the best material to use on top of plywood for water proofing?

...WRB, Rigid Foam, Delta Dry etc. For help choosing a weather barrier for the exterior of a home see here – Choosing a house wrap, which is best? In our 2015 LEED Platinum Demo house we installed a peel and stick weather barrier / exterior air barrier, see our how to install an air barrier properly DIY video. ZIP systems...

Posted by Babak K July 27, 2020 Air and vapour barriers 3 responses

Is the ZIP Sheathing system better than house wrap?

...WRB house wrap.  There are some great advantages to it, but also a downside that doesn’t get at on of mention – The ZIP System is less moisture permeable than a normal combination of sheathing and house wrap. This isn’t catastrophic, and unfortunately hybrid ad-on products regularly show up on the market as quick fixes...

Posted by Fred Martens Dec. 18, 2021 Walls and Roofs 1 response

What is the most cost effective way to build a rain screen wall assembly?

...WRB), vertical firring strips 24" o.c., 1/8" gapped 1"x6" reclaimed barn wood horizontal cladding.  We would really like to make recycled material we have available to us usable with the right assembly to ensure no future issues with water damage to the interior cavity of the wall system.  Thanks!

Posted by Jess Glowacki June 22, 2021 Wall assemblies - new construction

I have many issues with my house where should I start?

My house was built in the Late 1940 - early 1950's, it is a farm buglalow with an addition in 1973, a poured concrete basement and concrete block foundation addition. The basement is not insulated, the roof has very little insulation with vermiculite ( been tested ok) in the attic.  I wanted to find out where to start,...

Posted by Bryan Squirrell Sept. 29, 2019 Wall assemblies - renovation 1 response

Can you spray foam a house from the outside?

 I live in Calgary, Alberta. My house is a 1940s bungalow with a second storey added in 1988. We are replacing the vinyl siding with Hardie Board, and want to improve the insulation at the same time. Right now there is 1/2" rigid foam with foil directly under the siding. Someone recommended removing the sheathing and d...

Posted by Joan Lawrence July 11, 2019 Wall assemblies - renovation 3 responses

Can I spray foam insulate from the outside?

I bought an old timer home on Gibsons, BC and the siding needs replacing. I want to use the opportunity to seal up and insulate the wall cavity once exposed. I expect to see insufficient or no insulation. After applying spray foam what is best to apply (tyvek vs. something other) before installing the new board and bat...

Posted by Kurt Klischuk June 6, 2019 Wall assemblies - renovation 3 responses

What type of Insulation can I use on the exterior of my home?

...WRB), and a breatheable one would serve you best to allow as much moisture to pass through as possible. read more here -  Choosing a house wrap, which is best? Exactly how much insulation to add is a tough question that only you can really answer, it depends on whether there has ever been any cavity insulation added, h...

Posted by Scott Muller April 18, 2019 Wall assemblies - renovation 5 responses

Combo structural sheathing, WRB and thin insulation panel in Ontario?

...WRB sheathings we like, but we become a bit more concerned when panels have integrated insulation though. I did have a quick look at the Barricade Thermo-Brace product you mentioned, there are a few products they have to choose from. The one on the main image lists itself as a ‘moisture barrier’, so if that is the one ...

Posted by Steve Bull Jan. 14, 2020 Walls and Roofs 3 responses

Is the ZIP sheathing system good or bad for water control?

Do you have any experience with this system and know how it would compare to regular OSB sheathing with a fully adhered sheathing membrane? ZIP Sheathing is a pretty hot topic with some differing opinions. The ZIP System is a structural sheathing intended for walls and roofs, with an OSB base and WRB (weather resistive...

Posted by Trevor Prinz Nov. 26, 2019 Walls and Roofs 5 responses