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- FLOATING FOUNDATION DECK SYSTEM LATERAL SUPPORT FULL
- FLOATING FOUNDATION DECK SYSTEM LATERAL SUPPORT FREE
FLOATING FOUNDATION DECK SYSTEM LATERAL SUPPORT FULL
Although marketed to be used with excavated soils during backfill in lieu of a granular drainage layer, it is recommended that a full system approach be used in applications where water leakage is not tolerable a full system approach should include both a synthetic drainage layer and granular drainage layer. These systems are advantageous in their lightweight design and cost effectiveness. In general, drainage core widths of 1/4 to 1/2 inch provide drainage flow rates 3 to 5 times the rate of commonly used natural backfill materials. Many drainage mats also include a polyethylene sheet backer to uniformly disperse the loads imposed on the membrane and reduce the potential for damage caused by non-uniform profiles (dimples) in the composite core.ĭesign considerations include selecting an appropriate design to achieve the required flow rate.
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The fabrics are available in various forms including non-woven for clay type soils and woven or small opening geotextiles for sandy or high-silt type soils.
FLOATING FOUNDATION DECK SYSTEM LATERAL SUPPORT FREE
The geotextile fabrics retain sand, soil, concrete, or grout allowing water to migrate into the free draining core. The plastic composite "dimpled" drainage cores are available in various configurations and are typically constructed using polypropylene, polystyrene and polyethylene. Prefabricated Synthetic Drainage Layers-These products consist of a combination of plastic composite drainage cores with adhered geotextile fabrics. Gap-grading the sand provides uniform grain size, which accelerates drainage flow rates. Graded pea gravel refers to naturally rounded stone between 3/16 inch and 3/8 inch in diameter. Prefabricated Synthetic Drainage LayersĪggregate Drainage Layers-Aggregate drainage layers include graded pea-gravel aggregate or coarse sands.Descriptions and guidelines are provided on the following topics:ĭrainage Materials for below grade enclosures include: This section provides specific description of materials and systems common in foundation walls and below grade building enclosure systems in general. Expert advice may also be necessary when dealing with field conditions. Readers are advised to obtain expert advice when designing systems which are below the water table or which are enclosing particularly vulnerable occupancies. In the upper areas of the foundation wall thermal loading considerations must be addressed.
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However, water removal measures around foundation walls below the water table may be impractical and expensive over the long-term and the waterproofing strategy becomes critical. For most portions of the foundation wall, water removal and control is of prime importance. The foundation wall system may include an earth retention system of soldier piles and wood lagging or shotcreted rock requiring consideration of waterproofing applied to the earth retention system. Materials used may be concrete or reinforced masonry. The foundation wall of a building may be a cast-in-place concrete retaining or basement wall or a structural wall complete with load-bearing pilasters.