To know if you need a vapor retarder ask yourself a few basic questions.
Vapor barrier detached garage ceiling.
I ve read the articles here and on other sites and it seems like i can t get a final decision.
Water vapor can pass through building materials in several ways including direct transmission and by heat transfer but studies suggest that fully 98 percent of the moisture transfer through walls occurs through air gaps including cracks around electrical fixtures and outlets and gaps along baseboards.
The science of moisture movement.
It also has the advantage of letting out any moisture that may get through the interior vapor barrier.
Matt risinger a builder in texas on the cutting edge of building science yes that is a thing has a great video about whether or not you need a vapor barrier.
If you re adding new garage doors be sure to install insulated options.
Thus installing vapor barriers on wall surfaces must.
On the one hand i ve read about how air leakage is the main culprit of transporting moisture so i plan to air seal as best as i can with spray foam and caulk.
I m so confused about vapor barriers.
Writing to ask if i should using a kraft paper barrier plastic vapor barrier or no vapor in my garage insulation project.
This is normally done because it s the most cost effective method to achieve the desired level of comfort and ease of installation.
Now i m a real fan ha ha of controlled mechanical ventilation to limit interior moisture levels in cold and mixed climates as well as to.
I live in mn and am insulating my garage ceiling in an attached garage.
Omitting a ceiling vapor barrier by arguing that you have to let the moisture escape or because the house has to breathe out the top is actually correct in a way.
The traditional way to insulate the walls and ceiling of a typical garage is to install fibreglass batt insulation in the walls and attic space followed by a six mil poly air vapour barrier and drywall.
If you re using old uninsulated doors pick up a retrofit kit that add insulating panels.
The tyvek is intended to keep rainwater from getting to the sheathing.
Whether or not you need a vapor retarder hinges on three main factors your climate your home and the location of the wall you re insulating.
I am starting the process of insulating my detached 23 x 32 garage in buffalo ny cold lots of snow winters with the secondary goal of having constant natural gas overhead heat keeping.
And the ceiling acts as a enough of a vapor retarder.
It s also incorrect in a way.
Yes you should because the vapor barrier should always be installed on the warm side of the wall.
A vapor retarder is a material used to prevent water vapor from diffusing into the wall ceiling or floor during the cold winter.
Install as directed typically cutting to fit and using a staple gun to attach the vapor barrier to the studs.
