VOID FORMER THICKNESSES*

Depending on application, void formers come in multiple name options, including under beam, under slab or side protection.

Void former can be supplied as a block, slab or bespoke shaped pieces to suit the application or project. Standard board sizes are 2400mm x 1200mm up to a depth of 1200mm.

 

under beam

Picture credit: directpiling.co.uk

 

UNDER BEAM THICKNESSES

Under beam such as Cordek® Cellcore HX B, Max-frank Pecavoid® Plus+, RD, C or Jablite® is a lightweight expanded polystyrene (EPS) block designed for use beneath reinforced concrete ground beams and pile caps to protect against the potential effects of ground heave. It is made of moulded collection cellular legs with twin fluted polyproylene top. 

It is available in strips 2400mm long and widths from 300 to 1200mm in increments of 25mm to suit the associated beam and in overall depths of 85, 155 and 220mm.

Grades are specially calculated and calibrated for deformation of EPS under loading. The appropriate product grade is selected according to the maximum thickness of wet concrete that the product will be required to support during construction of the project.

 

cellcore under beam

 

max frank under beam

Picture credit: directpiling.co.uk

Generally speaking there are available in 3 thicknesses:

  • 85mm Cellcore HX B Under Beam EPS Concrete Ground Protection ǀ Grade 7/10
  • 85mm Cellcore HX B Under Beam EPS Concrete Ground Protection ǀ Grade 9/13
  • 85mm Cellcore HX B Under Beam EPS Concrete Ground Protection ǀ Grade 13/18
  • 85mm Cellcore HX B Under Beam (EPS) Concrete Ground Beams ǀ Grade 18/24
  • 85mm Cellcore HX B Under Beam (EPS) Concrete Ground Beams ǀ Grade 24/32
  • 85mm Max-frank Pecavoid® Plus+ ǀ Grade 8/12
  • 85mm Max-frank Pecavoid® Plus+ ǀ Grade 9/13
  • 85mm Max-frank Pecavoid® Plus+ ǀ Grade 10/15
  • 85mm Max-frank Pecavoid® Plus+ ǀ Grade 13/19
  • 85mm Max-frank Pecavoid® RD ǀ Reduced Depth ǀ Grade 8/12
  • 85mm Max-frank Pecavoid® RD ǀ Reduced Depth ǀ Grade 9/13
  • 85mm Max-frank Pecavoid® RD ǀ Reduced Depth ǀ Grade 10/15
  • 85mm Max-frank Pecavoid® RD ǀ Reduced Depth ǀ Grade 13/19
  • 85mm Max-frank Pecavoid® RD ǀ Reduced Depth ǀ Grade 15/22
  • 85mm Max-frank Pecavoid® RD ǀ Reduced Depth ǀ Grade 18/24
  • 85mm Max-frank Pecavoid® RD ǀ Reduced Depth ǀ Grade 24/32
  • 85mm Max-frank Pecavoid® RD ǀ Reduced Depth ǀ Grade 30/40
  • 85mm Max-frank Pecavoid® C-Range ǀ High load grades ǀ Grade 25-35
  • 85mm Max-frank Pecavoid® C-Range ǀ High load grades ǀ Grade 30/40
  • 85mm Max-frank Pecavoid® C-Range ǀ High load grades ǀ Grade 35/45
  • 85mm Max-frank Pecavoid® C-Range ǀ High load grades ǀ Grade 40/50
  • 85mm Max-frank Pecavoid® C-Range ǀ High load grades ǀ Grade 45/55
  • 85mm Max-frank Pecavoid® C-Range ǀ High load grades ǀ Grade 50/65
  • 85mm Jablite Ground Heave Protection for Beam ǀ Grade 7/10
  • 85mm Jablite Ground Heave Protection for Beam ǀ Grade 9/13
  • 85mm Jablite Ground Heave Protection for Beam ǀ Grade 10/15
  • 85mm Jablite Ground Heave Protection for Beam ǀ Grade 13/18
  • 85mm Jablite Ground Heave Protection for Beam ǀ Grade 18/24
  • 85mm Jablite Ground Heave Protection for Beam ǀ Grade 24/32
  • 85mm Jablite Ground Heave Protection for Beam ǀ Grade 30/40
  • 155mm Cellcore HX B Under Beam EPS Concrete Ground Protection ǀ Grade 7/10
  • 155mm Cellcore HX B Under Beam EPS Concrete Ground Protection ǀ Grade 9/13
  • 155mm Cellcore HX B Under Beam EPS Concrete Ground Protection ǀ Grade 13/18
  • 155mm Cellcore HX B Under Beam (EPS) Concrete Ground Beams ǀ Grade 18/24
  • 155mm Cellcore HX B Under Beam (EPS) Concrete Ground Beams ǀ Grade 24/32
  • 155mm Max-frank Pecavoid® Plus+ ǀ Grade 8/12
  • 155mm Max-frank Pecavoid® Plus+ ǀ Grade 9/13
  • 155mm Max-frank Pecavoid® Plus+ ǀ Grade 10/15
  • 155mm Max-frank Pecavoid® Plus+ ǀ Grade 13/19
  • 155mm Max-frank Pecavoid® RD ǀ Reduced Depth ǀ Grade 8/12
  • 155mm Max-frank Pecavoid® RD ǀ Reduced Depth ǀ Grade 9/13
  • 155mm Max-frank Pecavoid® RD ǀ Reduced Depth ǀ Grade 10/15
  • 155mm Max-frank Pecavoid® RD ǀ Reduced Depth ǀ Grade 13/19
  • 155mm Max-frank Pecavoid® RD ǀ Reduced Depth ǀ Grade 15/22
  • 155mm Max-frank Pecavoid® RD ǀ Reduced Depth ǀ Grade 18/24
  • 155mm Max-frank Pecavoid® RD ǀ Reduced Depth ǀ Grade 24/32
  • 155mm Max-frank Pecavoid® RD ǀ Reduced Depth ǀ Grade 30/40
  • 155mm Max-frank Pecavoid® C-Range ǀ High load grades ǀ Grade 25-35
  • 155mm Max-frank Pecavoid® C-Range ǀ High load grades ǀ Grade 30/40
  • 155mm Max-frank Pecavoid® C-Range ǀ High load grades ǀ Grade 35/45
  • 155mm Max-frank Pecavoid® C-Range ǀ High load grades ǀ Grade 40/50
  • 155mm Max-frank Pecavoid® C-Range ǀ High load grades ǀ Grade 45/55
  • 155mm Max-frank Pecavoid® C-Range ǀ High load grades ǀ Grade 50/65
  • 155mm Jablite Ground Heave Protection for Beam ǀ Grade 7/10
  • 155mm Jablite Ground Heave Protection for Beam ǀ Grade 9/13
  • 155mm Jablite Ground Heave Protection for Beam ǀ Grade 10/15
  • 155mm Jablite Ground Heave Protection for Beam ǀ Grade 13/18
  • 155mm Jablite Ground Heave Protection for Beam ǀ Grade 18/24
  • 155mm Jablite Ground Heave Protection for Beam ǀ Grade 24/32
  • 155mm Jablite Ground Heave Protection for Beam ǀ Grade 30/40
  • 220mm Cellcore HX B Under Beam (EPS) Concrete Ground Beams ǀ Grade 7/10
  • 220mm Cellcore HX B Under Beam (EPS) Concrete Ground Beams ǀ Grade 9/13
  • 220mm Cellcore HX B Under Beam (EPS) Concrete Ground Beams ǀ Grade 13/18
  • 220mm Cellcore HX B Under Beam (EPS) Concrete Ground Beams ǀ Grade 18/24
  • 220mm Cellcore HX B Under Beam EPS Concrete Ground Protection ǀ Grade 24/32
  • 220mm Max-frank Pecavoid® Plus+ ǀ Grade 8/12
  • 220mm Max-frank Pecavoid® Plus+ ǀ Grade 9/13
  • 220mm Max-frank Pecavoid® Plus+ ǀ Grade 10/15
  • 220mm Max-frank Pecavoid® Plus+ ǀ Grade 13/19
  • 220mm Max-frank Pecavoid® RD ǀ Reduced Depth ǀ Grade 8/12
  • 220mm Max-frank Pecavoid® RD ǀ Reduced Depth ǀ Grade 9/13
  • 220mm Max-frank Pecavoid® RD ǀ Reduced Depth ǀ Grade 10/15
  • 220mm Max-frank Pecavoid® RD ǀ Reduced Depth ǀ Grade 13/19
  • 220mm Max-frank Pecavoid® RD ǀ Reduced Depth ǀ Grade 15/22
  • 220mm Max-frank Pecavoid® RD ǀ Reduced Depth ǀ Grade 18/24
  • 220mm Max-frank Pecavoid® RD ǀ Reduced Depth ǀ Grade 24/32
  • 220mm Max-frank Pecavoid® RD ǀ Reduced Depth ǀ Grade 30/40
  • 220mm Max-frank Pecavoid® C-Range ǀ High load grades ǀ Grade 25-35
  • 220mm Max-frank Pecavoid® C-Range ǀ High load grades ǀ Grade 30/40
  • 220mm Max-frank Pecavoid® C-Range ǀ High load grades ǀ Grade 35/45
  • 220mm Max-frank Pecavoid® C-Range ǀ High load grades ǀ Grade 40/50
  • 220mm Max-frank Pecavoid® C-Range ǀ High load grades ǀ Grade 45/55
  • 220mm Max-frank Pecavoid® C-Range ǀ High load grades ǀ Grade 50/65
  • 220mm Jablite Ground Heave Protection for Beam ǀ Grade 7/10
  • 220mm Jablite Ground Heave Protection for Beam ǀ Grade 9/13
  • 220mm Jablite Ground Heave Protection for Beam ǀ Grade 10/15
  • 220mm Jablite Ground Heave Protection for Beam ǀ Grade 13/18
  • 220mm Jablite Ground Heave Protection for Beam ǀ Grade 18/24
  • 220mm Jablite Ground Heave Protection for Beam ǀ Grade 24/32
  • 220mm Jablite Ground Heave Protection for Beam ǀ Grade 30/40


UNDER SLAB THICKNESSES

Under slab void former, also called ‘anti-heave’ board is often a lightweight structural material made of continuous paper honeycomb or EPS polystyrene core developed to separate concrete slabs from reactive soil which can potentially exert damaging pressure on the structural foundations of a dwelling and to replace some of the volume of concrete (screed) in applications such as floors.
Under slab void former sheets are available in a variety of depths including: 60mm, 85mm, 90mm, 110mm, 160mm, 225mm and standard grades 7/10, 8/12, 9/13, 10/15, 13/18, 13/19, 15/22, 18/24, 24/32. 

Generally speaking there are available in 7 thicknesses:
 

cellcore under slab made by cordek

Picture credit: directpiling.co.uk

 

cordek under slab

Picture credit: directpiling.co.uk

 

max frank under slab

Picture credit: max-frank.co.uk


CLAY HEAVE PROTECTION BOARD THICKNESSES

Clay heave protection board known as a 'low density compressible side panel' such as Claymaster, Clayfill, Claylite or Heaveguard is a fill material used for vertical installation against the sides of ground beams, piled foundations and deep trench fill foundations (up to 2m deep) to prevent problems in foundations where the soil has a high clay content and is liable to heave.
Panels are delivered either in size 2400mm x 1200mm (8' x 4') or 2400mm x 600mm (8' x 2'). The required thickness of the board will vary depending on the potential ground movement and the allowable pressure limit of the foundation substrate.

 

heaveguard installed

Picture credit: directpiling.co.uk

claymaster installed

Picture credit: directpiling.co.uk

Generally speaking there are available in 5 thicknesses: