Details

Some manufacturers cast the concrete against foam insulation that provides the form during manufacture and added R-value in the wall. Panels range in size from 2'-12' in width by 8' - 12' in height and are typically installed with a crane on top of 4" to 6" of compacted stone. The stone facilitates sub-slab drainage and adequately carries and transfers the load from the foundation wall. Panel connections consist of bolts and sealant. The foundation can be backfilled as soon as it is braced per manufacturer's specifications.

The controlled temperature of the processing plant allows the manufacturer to work with concrete admixtures that focus on ultimate strength rather than cure time and temperature. Manufacturers are able to produce mixes that harden to 5,000 psi, which is stronger than concrete block or concrete walls formed and cast in the field. Better control of the concrete mixture and curing environment allows the use of low water/cement ratios that results in a dense material that prevents water penetration.

Installation

Installers should be experienced with assembling prefabricated foundation panels. In fact, some companies only allow certified installers to deliver and erect their systems. Once panels are erected, sealed, and bolted together, the basement slab can be poured. Floor joists above the foundation are conventionally installed and provide some of the bracing for the foundation walls. Once braced by the slab and floor system, backfilling against the walls can take place.

Benefits/Costs

Priced in the $55 - $65 range per linear foot of wall, precast systems are competitive with other foundation walls, particularly when costs are examined as an assembly that includes footings and sub-slab drainage. Precast walls can be installed quickly in any weather. Because the concrete is cured in the factory, precast foundations can be backfilled as soon as the slab is placed and first floor bracing is in place, enhancing jobsite safety and site accessibility.

Limitations

Door and window openings, steel beam pockets, and brick ledges must be cast into the panels, so orders must be customized. The wall sub-base must be compacted and leveled, similar to precision required of footings. Use of precast panels should be submitted for approval by the building official at time of building permit application.

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