SIGMA GPS Drainage Sheet includes a high compressive strength Cuspate High Density Polyethylene (HDPE) Drainage core with a geotextile filter geotextile bonded to one side. SIGMA GPS Drainage Sheet is designed as a high flow medium to alleviate hydrostatic pressure on below ground structures, as well as providing protection to the underlying membrane (gas/waterproofing).
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SIGMA GPS Drainage Sheet (£ - POA)
Color Black Grey Material Polyethylene Shape Rectangular - supplied in roll form Size 2 x 20 m x 8 mm Warranty Description 60 year Uniclass 2015 Pr_25_57_65_60 Plastics sheets CAWS J40/35 Loose laid plastics or rubber gas retardant damp proofing J40/140 Loose laid plastics or rubber sheet gas retardant damp proofing J40/145 Loose laid weldable polyethylene gas retardant damp proofing Material High density polyethylene and geotextile fleece. Purpose Protection layer. Drainage layer. Standard To BS 8102. Performance characteristics Tensile strength (minimum) 12 kN/m. Elongation to break 12%. Form Drainage core with geotextile bonded to either side. Physical properties Colour Black and Grey. Weight (minimum) 620 g/m2 Dimensions Thickness (minimum) 8 mm. Width (minimum) 2 m. Roll length (minimum) 20 m. Recycled content 0%. Country of material origin Czechia Country of product manufacture Czechia Characteristics Test Method Measurement CBR Puncture Resistance EN ISO 12236 1700 N Tensile Strength (MD/CMD) EN ISO 10319 12 kN/m Tensile Elongation (MD/CMD) EN ISO 10319 12 % Compressive Strength EN ISO 25619 140 kPa Characteristics Test Method Measurement Pore size (O90) EN ISO 12956 100 μm Permeability (H50) EN ISO 11058 79 l/m2/s In plane water flow EN ISO 12958 1.83 l/s/m width i = 1.0 @ 20 kPa (Hard/soft) platens EN ISO 12958 1.69 l/s/m width i = 1.0 @ 100 kPa (To simulate soil action) EN ISO 12958 1.53 l/s/m width i = 1.0 @ 200 kPa (i) Hydraulic gradient EN ISO 12958 0.49 l/s/m width i = 0.1 @ 20 kPa (i) = 1 simulates vertical application EN ISO 12958 0.45 l/s/m width i = 0.1 @ 100 kPa (i) = 0.1 simulates slope application EN ISO 12958 0.45 l/s/m width i = 0.1 @ 200 kPa Characteristics Test Method Measurement Mass per unit area EN ISO 9864 620 g/m2 Thickness EN ISO 9863-1 8.00 mm Characteristics Measurement Roll Width 2.00 m Roll Length 20 m Gross roll weight 30 kg Primarily used for external tanking applications, forming a high compressive strength void, providing a path of least resistance for water, which enables controlled drainage into outlets or connector pies. Its can be used in combination with GP gas/waterproofing barriers to provide both protection and drainage for external tanking application, ensuring gas/waterproofing barrier remains intact and the system performs as intended.
SIGMA GPS Drainage Sheet should be installed with the geotextile facing the soil/backfill, and the direction of water flow. Rolls can be cut to size on site. It can be held in place prior to backfilling with DS Butyl tape (50 mm wide), or mechanically fixed in the absence of a gas/waterproofing barrier.
Adjacent rolls can be overlapped using the geotextile, secured with DS Butyl tape (50mm). Roll ends can be connected by simply butting the cuspate sheet together.
Connection to land drains/collection pipes is achieved by placement within the slotted areas, or removal of the cuspated core and wrapping of geotextile around the pie. Care must be taken not to damage/cut the geotextile during core removal to facilitate the connection.
Backfilling should proceed with caution to avoid undue stress on the sheet. Compactive effort should be avoided within the first 100mm of the sheet.
Roll weights can be up to 35kg and hence appropriate equipment is required for unloading and handling. SIGMA GPS Drainage Sheet is supplied in packaging designed to protect the product from damage during handling and storage, and degradation as a result of UV exposure. SIGMA GPS Drainage Sheet should be kept in the supplied packaging until such time as it is required for installation, and then covered within 2 weeks of installation.
- BBA Certificate 20/5728
- CE
- UKCA
- UKNI