If you create enough thermal break than no barrier is needed. If you do not, then you need additional poly vapour barrier. Keep in mind that even if you used 1 inch rigid board, you have still done wonders for your basement by blocking the wet air from coming into your basement via the walls.
Do you need vapor barrier with foam board?
Foam insulation usually does not require a vapor barrier. For some foam insulation types, such as closed-cell spray foam and foam board insulation, the insulation itself stops the movement of most water vapor.
Do you need a vapour barrier with insulation?
Because it is mostly hot and very humid outside the building, the vapor barrier should be installed on the exterior of the insulation. This is recommended to keep the outside moisture from getting into the less humid, cooler interiors and damaging the building’s structure.
Do you need vapour barrier with XPS?
XPS is manufactured in both an unfaced form or with different plastic facings. However, XPS is considered a vapor retarder, not a vapor barrier.
Does rigid foam need to be covered?
Rigid foam insulation, whether it is expanded or extruded polystyrene, does have to be covered if it is installed in the interior of a building. This wall covering must have a minimum fire rating to protect the insulation from quick combustion during a fire.
How do you attach vapor barrier to foam board?
Quote from Youtube video: Under if you decide to put it under the foam board whenever you attach the foam board you could pierce the vapor barrier in that process.
Can exterior foam insulation cause mold and moisture problems?
The benefit of foam insulation in the exterior wall when it comes to moisture is it doesn’t provide a favorable material for mold to grow in and most foam products contain no food value for mold. Foam insulation also creates a needed air seal that will keep your home comfortable and energy-efficient.
Should I use vapour barrier?
If you live in a mixed climate – hot and humid with several heating months in the winter, you probably need a vapor retarder. Specifically, if you live in climate zones 4C (marine), 5, 6, 7 and 8.
Where should vapor barrier be installed?
Vapor barriers are usually best installed on the side of the wall that experiences the hotter temperature and moister conditions: the inner surface in colder climates and the outer surface in hot, humid climates. In existing spaces, oil-based paints or vapor-barrier latex paints offer an effective moisture barrier.
Do I need a vapour barrier?
Depending on where you live, the vapour barrier will either go on the inner surface of the insulation (if you live in a cold climate) or the outer surface of the insulation (if you live in a hot climate). It’s safe to say that a vapour barrier will be needed for almost all projects.
Does rigid foam insulation need to be covered in crawl space?
If your rigid foam insulation gets installed in a living area, such as a finished basement, then yes, it needs to be covered. However, it does not need to be covered in a crawl space. Rigid foam insulation typically gets made with polystyrene, a plastic.
What can I use to cover rigid foam?
Furring can be installed over the rigid foam board then gypsum boards are screwed through the furring. If the rigid foam board is too thick for screws, the gypsum board can be fastened using foam board adhesive. These are the summarized steps to install rigid foam covering.
Can you drywall over rigid insulation?
Drywall, which is actually a mineral called gypsum, resists fire. It also helps insulate and soundproof the room. The most common way to hang drywall over rigid foam insulation is to glue and screw it into place.
Can you put rigid foam insulation between studs?
Even with its flaws—namely, its inability to perfectly mold to the bays between the studs—rigid foam insulation will be a better bet than no insulation. Using low-expanding spray foam sealant to seal those gaps further increases rigid foam’s insulating properties between studs.
Which side of foam board insulation faces out?
If you’re wondering whether to put the foil side of foam insulation board shiny side in or out, consider whether you want to make the space inside warmer or cooler. If you want to make the space warmer, the foil should face inside so it can reflect radiant heat back into the room.
Can you screw into rigid insulation?
To attach the insulation, you can use screws with large washers, a special adhesive made for adhering foam board insulation or, for smaller pieces, you can seal them in with caulk or spray foam.
How do you install rigid foam insulation on wood?
- Measure the wood before you begin. …
- Wipe down the wood surface with a clean rag. …
- Coat the wood with foam insulation adhesive, then press the insulation lightly against the wood. …
- Wait until the initial bond sets, them press the foam insulation firmly against the wood.
How do you install rigid foam insulation on exterior walls?
Quote from the video:
Quote from Youtube video: It's our air barrier. And we like to put subfloor adhesive or a silicone adhesive between the bottom plate and top plate of the wall.
How do you adhere rigid insulation?
Quote from the video:
Quote from Youtube video: What I'm going to use to attach this so is these plastic anchors. So you need a hammer drill with the appropriate. Masonary bit in it. So that you can drill through through the styrofoam.
How thick should foam board insulation be?
Most panels range between 3/8″ and 2.5″ in thickness, though other dimensions and thicknesses are usually available through custom order.
How do you insulate basement walls with rigid foam?
Quote from the video:
Quote from Youtube video: Position the board's vertically. Using a level to ensure they are plumb against the wall. Notice how the notched edges fit together to create an insulated channel with no energy robbing air gaps.
