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A below-grade foundation wall with a damp-proof coating
A dimpled plastic water barrier protects the insulated concrete form basement walls and carries any ground water down the walls to the footing drain to minimize the opportunity for water intrusion and frost heave.
A dimpled rain mat and perforated drain pipe provide drainage around the basement foundation.
Air seal the floor above an unconditioned basement or crawlspace and make sure floor insulation is in full contact with the underside of the subfloor.
An active radon fan helps pull radon out of the home’s basement.
Complete water management strategy for a below-grade wall
Exterior surface of below-grade walls finished as follows: For poured concrete, concrete masonry, and insulated concrete forms, finish with damp-proof coating
Exterior surface of below-grade walls finished as follows: For wood-framed walls, finish with polyethylene and adhesive or other equivalent waterproofing
Foil-faced rigid foam and spray foam can be used to insulate a basement on the interior; use good moisture management techniques to keep the basement dry
Infrared image of a rim joist
Insulation not aligned with subfloor or joists
Moisture infiltration in below-grade wall
Moisture problems must be dealt with before sealing and insulating a crawlspace
Precast concrete basement walls come to the site with integrated rigid foam insulation and steel-faced concrete studs.
Right – Air barrier is present and installed between the floor system and unconditioned space
Right – Below-grade concrete has been properly sealed against moisture and is now having insulation installed
Right – Penetrations through the floor are air sealed
Right – Sub-floor insulation is properly installed and supported
Right – The below-grade concrete walls have damp-proof coating
Right – The insulated concrete forms that are below-grade have a damp-proof coating to prevent moisture seeping into the foundation
The polyethylene ground cover for this insulated crawlspace is taped at seams and around posts before the insulation and slab are installed.
Rigid foam insulation is installed along the exterior edge of an existing foundation slab
The basement is constructed with pre-cast concrete walls lined with R-21.3 foil-faced rigid foam while an R-10 layer of XPS rigid foam covers the ground under the slab.
The basement is half in and half out of the ground with only 4 feet below grade, which allows for full 36-inch-tall windows that are completely above grade.
The basement walls are wrapped with 3 inches of XPS rigid foam that will be taped at the seams then covered with a dimpled plastic water barrier.
The basement walls’ interior framing is set in 3 inches from the concrete to allow space for closed-cell foam that is sprayed directly on the concrete, then blown cellulose is added to fill the wall cavity.
The conditioned basement is insulated on the interior with 1 inch of polyiso R-6.3 rigid insulation.
The daylight basement walls are made of concrete walls with integrated rigid foam and steel-faced concrete studs.
The poured concrete basement walls are insulated along the inside with 2.5 inches of extruded polystyrene insulation.
The rim band connecting the insulated precast concrete basement walls to the floor joists above is spray foamed to provide air sealing and insulation in this hard-to-seal juncture.
This house was designed with half of the basement above grade, allowing 36-inch-tall windows for egress and daylight on both sides of the house.
Untreated lumber has been used on a below-grade wall against masonry
Wrong - Basement rim joist not sealed
Wrong - Basement window not sealed
Wrong – No air barrier is present between the floor system and unconditioned space
Wrong – Penetration through the floor is not air sealed
Wrong – Sub-floor insulation has gaps, compression, and misalignment
Wrong – Sub-floor insulation is not properly installed or supported
Wrong – The below-grade concrete does not have the correct mixture to be impermeable to moisture
Wrong – The below-grade concrete walls do not have any damp-proof coating
Wrong – The insulated concrete forms at the foundation do not have a damp-proof coating