HeaveMaster GHP
| BEWI HeaveMaster GHP provides a stable platform to support a specified depth of wet concrete during construction and, a fully-tested cellular core that will collapse under the specified fail-load pressure to limit damage caused if upward pressure occurs.
BEWI HeaveMaster GHP (Ground Heave Protection) cellular collapsible void formers are supplied in a range of grades and depths to suit your specification. Each void former is engineered to protect the foundations of buildings against the damage caused by the upward pressure of clay or ground heave in a specific situation. |
Key Benefits
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Technical Information
BEWI HeaveMaster GHP
BEWI HeaveMaster GHP are cellular-structured void formers, precision cut from EPS (expanded polystyrene).
The void formers are manufactured in a range of thicknesses to meet the application – Beam, Slab or Insulated Slab – requirement and the soil plasticity and predicted ground movement on the site (see datasheet).
Beam
The BEWI HeaveMaster GHP void formers are supplied in pre-cut widths from 300 – 1200mm in 25mm increments. Bespoke sizes are available on request.
Slab
The BEWI HeaveMaster Slab void formers are supplied in 1200mm × 1200mm sizes.
Testing and Quality Control
BEWI HeaveMaster GHP void formers are thoroughly tested to ensure each one will achieve the specific performance required. Our dedicated rig enables the testing of whole GHP void formers – not just a small part of the product – so we know that they function exactly as designed.
In addition, we have a rigorous ongoing quality testing programme which ensures that the performance of BEWI HeaveMaster GHP void formers can always be relied upon.
Polypropylene Top Sheet
All BEWI HeaveMaster GHP void formers are supplied with a bonded polypropylene top sheet. The thickness of the top sheet is tailored to suit the application requirement.
Polypropylene Bottom Sheet
All BEWI HeaveMaster GHP void formers are supplied with a bonded polypropylene bottom sheet. This bottom sheet helps provide a firm and flat surface for installation over suitably prepared level and even substrates.
The bottom sheet is 2mm for all applications.
Bespoke Products
For projects with special requirements, such as a concrete thickness of over 1940mm, BEWI will design a bespoke void former to meet your unique requirements. Please contact your Technical Sales Manager to discuss details.
Product Grades
BEWI HeaveMaster GHP is supplied in nine different performance grades to meet the required safe-load and fail-load performances for different thicknesses of concrete (see datasheet).
Each grade, from 1 to 9, supports a specified depth of wet concrete during construction and the subsequent collapse required in the event of upward pressure.
BEWI HeaveMaster Insulated Slab
In cases where insulation is also required beneath the slab, BEWI HeaveMaster GHP IS (Insulated Slab) can be utilised to provide combined ground movement protection and insulation from a single product.
The Insulated Slab will achieve a specified thermal performance. The insulation boards are supplied in white EPS or for an improved thermal performance grey HP EPS can be supplied.
Depending on the thickness of the insulation board, U-values as low as 0.15 W/m²K can be achieved. The U-value table over shows examples of the U-values that can be achieved with the different depths of white or HP EPS.
The U-value of a completed floor will depend on the insulation thickness, the perimeter/area ratio and the floor construction (see datasheet).
Drainage
The cellular Expanded Polystyrene (EPS) core is designed to include drainage slots in every node (where four faces meet).
The slots allow water that could be trapped in the collapsed cells to escape as the void former compresses.
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