How far below grade should a retaining wall be?
The general rule of thumb is to bury about one-eighth of the height of the wall. For example, if your wall will be three feet (36 inches) tall, the first course of blocks should start five inches below soil level. The gravel base should start three inches below this.
What is a below grade exterior wall?
Below grade walls have soil or crushed rock on one side and interior space on the other side.
What are placed under the base of the foundation wall?
Footings. Footings lie under the basement, crawlspace or stem wall and transfer structural loads from the building to the supporting soil. Footings are typically cast-in-place concrete, placed beneath the frost depth to prevent damage resulting from heaving caused by freezing of water in the soil.
What kind of concrete is used for below grade walls?
Most foundation and below-grade walls are constructed from poured concrete or concrete masonry block. Concrete products are porous and, unless treated, are not waterproof, allowing water to migrate into the building . A damp-proof coating can be applied directly to the surface of the concrete below-grade walls.
What kind of cement should be used for foundation walls?
Foundation walls that retain earth and enclose interior spaces and floors below grade must be damp-proofed from the top of the footing to the finished grade. Masonry walls must have at least 3/8 inch Portland cement parging applied to the exterior.
Where do you place a concrete foundation wall?
Unless otherwise required, footings should be carefully aligned so that the concrete masonry wall will be near the center line of the footing. Although the top surface of poured concrete footings should be relatively level, it should generally not be troweled smooth, as a slightly roughened surface enhances the bond between the mortar and concrete.
How to prevent water penetration in below grade concrete?
Coatings are sprayed, trowelled, or brushed onto below-grade walls, providing a continuous barrier to water entry. Coatings should be applied to clean, structurally sound walls. Walls should be brushed or washed to remove dirt, oil, efflorescence, or other materials which may reduce the bond between the coating and the wall.
Most foundation and below-grade walls are constructed from poured concrete or concrete masonry block. Concrete products are porous and, unless treated, are not waterproof, allowing water to migrate into the building . A damp-proof coating can be applied directly to the surface of the concrete below-grade walls.
Unless otherwise required, footings should be carefully aligned so that the concrete masonry wall will be near the center line of the footing. Although the top surface of poured concrete footings should be relatively level, it should generally not be troweled smooth, as a slightly roughened surface enhances the bond between the mortar and concrete.
Foundation walls that retain earth and enclose interior spaces and floors below grade must be damp-proofed from the top of the footing to the finished grade. Masonry walls must have at least 3/8 inch Portland cement parging applied to the exterior.
Coatings are sprayed, trowelled, or brushed onto below-grade walls, providing a continuous barrier to water entry. Coatings should be applied to clean, structurally sound walls. Walls should be brushed or washed to remove dirt, oil, efflorescence, or other materials which may reduce the bond between the coating and the wall.
