GP® VOID VENT is a geocomposite void former composed of a cuspated High Density Polyethylene (HDPE) Drainage core with a non-woven polypropylene (PP) geotextile separator/filter bonded to one side. Optimised for maximum strength and performance, providing high levels of air/gas flow.

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Product Benefits

  • HDPE does not support bacterial growth.
  • HDPE is highly resistant to acids and alkalis.
  • Made in accordance with the recommendation contained within NHBC Guidance and BS8485:2015 + A1 2019.
Product Description

GP® VOID VENT is a cuspated HDPE core with a geotextile filter/separator bonded to a single side, in either 25 mm or 45 mm depth. The intended use of the void vent is to provide a means of ventilation when used in conjunction with an approved gas protection barrier, in accordance with the recommendation(s) contained within NHBC guidance and BS8485:2015 + A1 2019.

The Void Vent is supplied in either 25mm or 40mm void depth. Material is joined by overlapping of the loose edge of geotextile for full coverage, or laid in strips as per the ventilation design.

Complies with the latest codes of practice as published by BRE, CIRIA and NHBC. Void Vent is independently tested and verified by UKAS accredited bodies.

GP<sup>®</sup> VOID VENT
MaterialPolyethylene - High Density Polyethylene (HDPE).
Size0.9 x 50 m x 27 mm 0.97 x 25 m x 42 mm
Uniclass 2015 Pr_25_57_51_74
CAWSD21/360 Geocomposite venting layers
StandardBS 8485: 2015, A1 2019.
Studded layer High-density polyethylene (HDPE).
Filter layer Geotextile.
Sheet thickness 27 mm. 42 mm.
Weight (minimum) 60 kg.
Performance characteristics
Flow rate 5 l/m/s.
CharacteristicsTest MethodGP® VOID VENT 25 mmGP® VOID VENT 40 mm
ThicknessEN ISO 9863-127 mm42 mm
Material DesignN/A
Roll WidthN/A0.9 m0.97 m
Roll LengthN/A50 m25 m
Gross Roll WeightN/A60 kg50 kg
Product Information
PolymerHigh Density Polyethylene
Biological ResistanceHDPE does not support bacterial growth
Chemical ResistanceHDPE is highly resistant to acids and alkalis
CharacteristicsTest MethodGP® VOID VENT 25 mmGP® VOID VENT 40 mm
CBR Puncture ResistanceEN ISO 122361.4 (-0.14) kN1.4 (-0.14) kN
Tensile Strength (MD/CMD)EN ISO 1031920/15 (-2.0/-1.5) kN/m10/10 (-1.0/-1.0) kN/m
Compressive StrengthEN ISO 25619-2300 kPa200 kPa
CharacteristicsTest MethodGP® VOID VENT 25 mmGP® VOID VENT 40 mm
Pore Size (O90) [geotextile]EN ISO 1295680 (± 20) μm80 (± 20) μm
Permeability (H50) [geotextile]EN ISO 11058100 (-20) l/m2/s100 (-20) l/m2/s
Water Flow Capacity [Composite] (200 kPa, (i)=1)EN ISO 129585 l/m/s>5 l/m/s
Gas Flow Capacity [Composite]Calculated (a)0.024 m3/s0.033 m3/s

GP® VOID VENT is designed to be used below ground level structures to provide a void in which harmful gases have a preferential pathway to flow through the underside of the building and discharge at the perimeter via suitable outlet accessories dependent on the design.

GP® VOID VENT should be used in conjunction with an approved Gas Protection Barrier and in accordance with the recommendations contained within BS8485:2015 + A1 2019.

Gas venting design should be prepared by a suitably qualified geo environmental engineer with calculations to demonstrate suitable dilution capabilities. JUTA UK recommends the installation of the GP® VOID VENT is completed by a suitably qualified and accredited installers (NVQ level 2). JUTA UK can offer advice as to suitable/recommended installers if required.

GP<sup>®</sup> VOID VENT

A selection of standard details for information and education purposes only. Note - it is strongly advised appropriately qualified, and insured personnel undertake gas membrane installs. A gas membrane performs a critical function in the application setting and has an anticipated design service life in excess of 60 years. Do not attempt to install gas membranes from these details alone. Sole rights for use and distribution are owned by JUTA UK LTD.

Roll weights can be between 50 kg and 100 kg hence appropriate equipment is required for unloading and handling.

GP® VOID VENT is supplied in packaging designed to protect the product from damage during handling and storage, and degradation as a result of UV exposure. GP® VOID VENT should be kept in the supplied packaging until such time as it is required for installation.

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Site Investigation
Site Investigation
Site Investigation Reports Monitoring Results. We review these reports and advise routes for compliance.
System Design
System Design
Full Ground Gas Protection System Design available.
Wide library of standard details with site specific details on request.
All our installers are certified NVQ Level 2 qualified installation contractors.
We ensure your project complies with the relevant building regulations.

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