Basement vapour barrier / Guides

Slab-on-grade construction technical guide
Slab on Grade

Slab-on-grade technical guide

...basement with much cheaper and better performing walls, though if you do need to build a basement to optimize sqft on your building plot, then learn best practice for insulating when building a new basement here , or if you have a basement and need to learn how to finish a basement & insulate correctly to avoid mold, s...

Roxul mineral wool batt insulation in LEED Homes
Insulation and soundproofing

Choosing the right insulation: the pros, cons and applications for walls, slabs & basements

...basement floor as insulation. I say this because it has been used for this purpose, and is completely ineffective. It would do no harm and still work as a vapour barrier, but it is a waste of money buried in concrete. See our pages on the best amount of basement slab insulation for more on how best to stay warm below g...

Crawlspace radon barrier installation for radon mitigation
Radon in Homes - Mitigation

Removing radon gas from basements and crawlspaces

...barrier. Radon mitigation in finished basements: If you have a finished basement and have discovered you have high levels of radon, don’t panic , there are effective and affordable options. The easiest and most affordable option is sub-slab depressurization. Most newer homes would have a vapour barrier below the ...

Choosing a building envelope
Wall assemblies - new construction

Choosing a building envelope - starting with the perfect wall

...vapour control layer, or vapor barrier : Although commonly known as a 'vapour barrier' a better term to use would be a vapour retarder. A moisture control barrier should slow diffusion of moisture through walls in either direction without preventing them from properly drying. Some materials within a wall assembly m...

Radon Mitigation - Installing a radon evacuation stack in a slab floor
Radon in Homes - Mitigation

Mitigating radon gas in homes

...basements & crawlspaces: Removing radon from basements & crawlspaces is easier if prevented rather than cured, and existing homes that are found to have high levels of Radon should look at mitigation asap. Depending on the state of your basement and or crawlspace, there will be varying degrees of difficulty in mitiga...

Prefab frost-protected shallow foundation insulated form kit
Slab on Grade

Raft slabs - How to build Insulated Frost Protected shallow foundations (FPSF) on problem soils

...basement, with no thermal bridging and reduced risk of mold. Basement mockup with raft slab and ICF wall courtesy of Treehugger Mockup of a raft slab with radon/vapour barrier protected between layers of EPS foam © Legalett Read more about Insulated Slab-on-Grade Foundation Form Systems here , from the ...

Passively-heated off-grid LEED house in Low, Quebec
Off-grid and Net-Zero Housing

Off-grid living blog: a firsthand account of building and living in a remote area

...barrier to the inside. The final layer is strapping covered by drywall. This total assembly measures R-26. Underneath the basement concrete slab is 4" inches of EPS rigid foam giving R-16. A couple other finishing details really help to reduce the basement heating loads. First, the basement concrete slab is actually ...

Crawl Spaces or Slab on Grade Foundations?
Crawl spaces

Should I Build on a Slab on Grade Foundation or a Crawl Space?

...vapour barrier when installed with multiple layers and offset joints as it will not absorb moisture from the ground. • Building on high ground eliminates any risk of flooding. • A slab on grade with a frost-protection skirt designed for its specific climate will not heave. • EPS foam with parging on it or an exte...

Crawl Spaces or Slab on Grade Foundations?
Foundations and Basements

Slab on grade or crawlspaces, which is better?

...vapour barrier when installed with multiple layers and offset joints as it will not absorb moisture from the ground. • Building on high ground eliminates any risk of flooding. • A slab on grade with a frost-protection skirt designed for its specific climate will not heave. • EPS foam with parging on it or an exte...

Problem areas of air leakage in a home and blower door test being cond
Air and vapour barriers

Airtight Construction of Homes is Essential: "Your house sucks." "Oh yeah? your house blows!"

...vapour barrier. The greater the differential in temperature between inside and out, the greater the concern. Negative air pressure in houses in winter will draw in cold air , making your house feel drafty and increase your heating costs. The issue isn't about durability but rather comfort and cost due to heat and ene...

Renovate, Remodel or Rebuild? How to choose which is Best for Homes
Wall assemblies - renovation

Should I be renovating my home or tearing it down & rebuilding?

...vapour barrier, then a thick layer of insulation . Exterior vapour barrier construction is a simple practice and an excellent one, but it behaves very differently than interior vapour barriers and requires a thorough understanding of the physics behind it so you don’t unwittingly design it to fail. To understand the di...