Product Specification

Altherm ICF block specifications

Our premade forms fit together as large interlocking blocks. We use two EPS panels spaced apart by high strength polypropylene webs, that form an insulated permanent shuttering into which concrete is poured.

By using polypropylene webs, we further reduce thermal bridging. These webs maintain a core thickness between the EPS panels of either 150mm (300mm ICF block) or 200mm (350mm ICF block).


See below for further information about:

  • 300mm Standard ICF Blocks
  • 350mm ICF Block for Multi-Storey Apartments      & Commercial Buildings       
  • Declared Characteristics

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300mm - STANDARD ICF BLOCKS

  • Altherm ICF STRAIGHT BLOCK

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300mm Straight Form
Length x Height x Width(mm) 1200 x 400 x 300
Width of Concrete Form (mm) 150
Width of Concrete (m3)/m2 of wall 0.014
Thermal Conductivity (λ) 0.030 W/m.K

300mm Straight Form is comprised of two insulating EPS panels (75mm thick) connected by high strength polypropylene webs. These webs maintain a core thickness between the EPS panels of 150mm, where the concrete is poured.

  • Suitable for foundations & ground floor
  • Reversible
  • Altherm ICF CORNER block

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300mm Corner Form
Length x Height x Width(mm) 862 x 412 x 400 x 300
Width of Concrete Form (mm) 150
Width of Concrete (m3)/m2 of wall 0.014
Thermal conductivity (λ) 0.030 W/m.K

300mm Corner Form has 75mm insulating panels on either side of a 150mm core. The forms are 412mm on the short side and 812mm on the long side.

  • Suitable for foundations & ground floor
  • Reversible
  • Altherm ICF 300 size 160x75 with vertical cavity closer

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300mm Vertical Cavity Closer
Length x Height x Width(mm) 400 x 150 x 75

The 300mm Vertical Cavity Closer slots neatly into either the 300mm corner or straight forms to close off the concrete core at the sides of openings.

  • Fits into 300m straight or corner ends
  • Essential to minimise thermal bridging
  • Reversible
  • Altherm ICF Cavity Closers

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300mm Horizontal Cavity Closer
Length x Height x Width(mm) 1200 x 150 x 65

The 300mm Horizontal Cavity Closer fits neatly into either the top or bottom of the 300mm straight forms to close off the concrete core at the heads and sills of openings.

  • Fits into 300m straight or corner ends
  • Essential to minimise thermal bridging
  • Reversible

350mm - ICF BLOCK FOR MULTI-STOREY APARTMENTS & COMMERCIAL BUILDINGS

  • Altherm ICF STRAIGHT BLOCK

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350mm Straight Form
Length x Height x Width(mm) 1200 x 400 x 350
Width of Concrete Form (mm) 200
Width of Concrete (m3)/m2 of wall 0.019
Thermal conductivity (λ) 0.030 W/m.K

350mm Straight Form provides a concrete core of 200mm which is sufficient bearing for hollow core thickness between the EPS panels of 150mm, where the concrete will be poured.

  • Suitable for multi-storey floors/apartments
  • Reversible
  • Altherm ICF CORNER block

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350mm Corner Form
Length x Height x Width(mm) 862 x 462 x 400 x 350
Width of Concrete Form (mm) 200
Width of Concrete (m3)/m2 of wall 0.013
Thermal conductivity (λ) 0.030 W/m.K

350mm Corner Form has 75mm insulating panels on either side of a 200mm core. The forms are 462mm on the short side and 862mm on the long side.

  • Suitable for multi-storey floors/apartments
  • Reversible


  • Altherm ICF 300 size 160x75 with vertical cavity closer

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350mm Vertical Cavity Closer

Length x Height x Width(mm) 400 x 200 x 75

The 350mm Vertical Cavity Closer slots neatly into either the 350mm corner or straight forms to close off the concrete core at the sides of openings.

  • Fits into 350m straight or corner ends
  • Essential to minimise thermal bridging
  • Reversible
  • Altherm ICF Cavity Closers

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350mm Horizontal Cavity Closer
Length x Height x Width(mm) 1200 x 200 x 65

The 350mm Horizontal Cavity Closer fits neatly into either the top or bottom of the 350mm straight forms to close off the concrete core at the heads and sills of openings.

  • Fits into 350m straight or corner ends
  • Essential to minimise thermal bridging
  • Reversible

Declared Characteristics

Essential Characteristic Technical Specification Product Performance
Declared Thermal Conductivity (50mm) IS EN 12667 0.030 W/mK
Compressive Strength at 10% Deformation IS EN 826:2013 129 kPa
Bending Strength IS EN 12089:2013 329.65 kPa
EPS Density IS EN 1602:2013 Min 24 kg/m3
Reaction to Fire IS EN ISO 11925-2, IS EN 13501-1:2007 Euroclass E
Water Vapour Permeability IS EN 12086:2013 0.7208 mg/m·h·Pa
Water Absorption by Partial Immersion IS EN 12087:2013 0.23 kg/m2
Water Absorption by Total Immersion IS EN 12087 2.1 %

REQUEST A QUOTATION

Let us do some of the hard work and put together a comprehensive quote for your next project.

Upload your drawings and programme details and we’ll get back to you within 5 working days. Or if you prefer you can give our Commercial Director, Trevor Coyle, a call on +353 1 8422 823

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