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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.
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
Moisture infiltration in below-grade wall
Moisture problems must be dealt with before sealing and insulating a crawlspace
Right – Below-grade concrete has been properly sealed against moisture and is now having insulation installed
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.
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.
Untreated lumber has been used on a below-grade wall against masonry
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