BASC Search | Building America Solution Center

The below-grade wall assembly includes dampproofing, draining details, and insulation.

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Damp-Proof Exterior Surface of Below-Grade Walls

Guide

Guide describing how to apply water management strategies to below-grade walls.

Wrong – The insulated concrete forms at the foundation do not have a damp-proof coating

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Right – Polyethylene sheeting vapor barrier is installed and sealed to the crawlspace walls with mastic

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Wrong - Class I vapor retarder over framed basement walls can cause condensation, mold, and rotting because plastic prevents drying to the inside; the outside should have waterproofing and vertical drainage, and the framing should be spaced from the wall.

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Right - Below-grade concrete has been properly sealed against moisture and is now having insulation installed.

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Right – The insulated concrete forms that are below-grade have a damp-proof coating to prevent moisture seeping into the foundation

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Easy access

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Water intrusion

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Pouring the slab

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Good water management practices like sloping grade away from house, and installing gutters, perimeter drain pipe, a capillary break, and free-draining soils or drainage mat protect the foundation from water saturation.

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There is no polyethylene sheeting installed in the crawlspace

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Wrong – The polyethylene sheeting vapor barrier is not attached to the piers with mechanical fasteners

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Right - Basement slab with a capillary break of either gravel or a drainage mat.

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Capillary Break at Crawlspace Floor - Polyethylene Sheeting under Concrete Slab

Guide

Guide describing how to install a capillary break to help manage moisture in foundations.

Site Drainage Practices to Minimize Localized Flooding

Information Guide

Information guide describing steps that builders can take to reduce the likelihood of standing water and localized flooding around the foundation of a home during rainy conditions.

Footing Drain Pipe

Guide

Guide describing how to help drain water away from the perimeter footing.

Below-Grade Water Management for Urban Sites

Guide

Guide describing methods to manage groundwater under and around urban multifamily buildings.

Final Grade Slopes Away from Foundation

Guide

Guide describing how to properly grade a site so water will flow away from the foundation.