Interior sheathing / Guides

Interior sheathing as air & vapor barriers in wood frame construction
Air and vapour barriers

Interior sheathing as an air and vapour or vapor barrier

...interiors, the vapour drive reverses and can force moist air inwards through your insulation where it can condense on a cold and impermeable vapour barrier. Ideally we'd have no vapour barrier in summer; but short of that we should at least have one that allows as much drying to the interior as possible without sacri...

Choosing between OSB or Plywood for house sheathing for Roofs, Walls & Floors.
Wood and organic materials

Which is better, OSB or Plywood for Roofs, Walls & Floors?

...sheathing, and those panels are designed with it on the interior . Placing insulation on the outside would keep the sheathing warmer, and reduce the risk of condensation forming. Placing it on the inside of sheathing could have unanticipated and undesired results. And this from the Canada Mortgage and Housing Corpora...

Passive House wall system ; Larsen Trusses & dense-packed cellulose insulation
Wall assemblies - new construction

Larsen truss wall systems with double-stud construction & extra insulation for new homes & energy efficient home renovation

...sheathing, then I-joists (TGIs) attached to the exterior of the sheathing to allow for seamless insulation with no thermal bridging . The sheathing is used as the air barrier and vapor barrier , by using a high-performance building tape to seal the joints and the Larsen Trusses are effectively a cost-effective and ligh...

Installing Siding Correctly
Exterior cladding

How to install siding

...sheathing and cladding is an important part of the strategy needed to allow walls to shed moisture in all seasons and conditions. Drainage planes (building paper, house wrap, etc.) allow any moisture that does accumulate behind siding a chance to drain away harmlessly. The air space between siding and sheathing shoul...

Building science for LEED v4 wall design made easy
Concept and design

Building science for LEED v4 wall design made easy - video

...sheathing; the difference is that vapour and air control layers are moved to the exterior of the sheathing, then additional insulation is installed outside of that. Stud cavities are still insulated with batts, but the majority of insulation is on the outside of the sheathing, this way the vapour control layer is san...

Tyvek home wrap left exposed to wind and UV rays
Air and vapour barriers

Choosing the right house wrap / weather barrier, which is best?

...sheathing will impact vapour permeability of the wall assembly as well. [Read more about material permeability here] . Conclusions about the vapour permeability of sheathing seem to differ heavily from different sources, We will run with the pack on this one for now, using the numbers most manufacturers cite. 7/16"...

Choosing a building envelope
Wall assemblies - new construction

Choosing a building envelope - starting with the perfect wall

...sheathing, then I-joists (TGIs) attached to the exterior of the sheathing to allow for seamless insulation with no thermal bridging . The sheathing is used as the air barrier and vapor barrier , by using a high-performance building tape to seal the joints and the Larsen Trusses are effectively a cost-effective and ligh...

The difference between air barriers and vapour barriers
Air and vapour barriers

The Difference between air barriers and vapor barriers

...interior with at least 2/3rds of your insulation on the outside of the vapour barrier. Air barriers on the other hand can come in the form of house wrap (WRBs) , tightly sealed sheathing, insulation that slows airflow, and well-sealed gypsum board (drywall). To explain this further, Gypsum board (drywall) is vapor pe...

Off grid, passively heated and cooled house in the Gatineau Hills, Que
Off-grid and Net-Zero Housing

Off grid living blog, part 2: passively heated, this house in Quebec aims for LEED certification

...sheathing; house wrap; strapping; cement board siding. The ceiling is a mix of Roxul mineral wool batts and cellulose totalling R80, the basement is a mix of EPS foam and Roxul batts totalling R28. The benefits of a double exterior wall are plenty. It eliminates thermal bridging through studs, provides lots...

Which wood is best for framing timber frame construction in homes?
Wall assemblies - new construction

Lumber choices for wood frame construction - choosing timber for framing & building homes

...sheathing with foam attached © Ecohome OSB (Oriented Strand Board) Also known as Aspenite, OSB is a panel fabricated using small strips of wood . OSB is not as strong as plywood, or as resistant to weather, but it is a lower cost alternative to plywood. It is most often used as exterior sheathing, as well as be...

Installing foam panel insulation, which is best?
Insulation and soundproofing

Rigid insulation panels: which ones to use for different applications

...interior thermal break when it's kept a bit warmer by batt insulation in stud cavities. Being petroleum based should not result in foam being condemned by green builders on principle alone; it should be looked at in perspective. There are other great types of insulated sheathing (mineral wool, wood fiber and fibergla...