Altherm ICF Products
Altherm ICF Products Range
Our product range is designed to help you build homes that comply with building regulations and meet the new Part L obligations. In addition, you’ll improve your building programme. Essentially, our low-energy, compliant ICF products will save you time, reduce costs, and ultimately enable you to build top quality houses – and are also certified for use in the construction of buildings of up to six stories (18m).
How ICF works
Thermal bridging is reduced further by using polypropylene webs. 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

A focus on simplicity
With a focus on simplifying the installation process, we supply four main products in two wall thickness sizes, our standard 300mm, and 350mm for concrete floor bearing floors multi-storey apartments / commercial buildings. Fully reversible blocks ensure there are no left, right, top, or bottom limitations, which allows you to reduce waste, and volume of work, while also simplifying ordering. Our products are very adaptable on-site and can be easily cut to size before being filled with concrete.
300MM - STANDARD ICF BLOCKS

300mm Straight
Standard ICF Block
Suitable for foundations & ground floor. Fully reversible.

300mm Corner
Standard ICF Block
Suitable for foundations & ground floor. Fully reversible.

300mm Closer
Standard ICF Block
Minimise thermal bridging with cavity closers designed to fit into 300m straight or corner ends.
350MM - ICF BLOCK FOR MULTI-STOREY APARTMENTS & COMMERCIAL BUILDINGS

350mm Straight
Standard ICF Block
Suitable for multi-storey floors/apartments. Fully reversible.

350mm Corner
Standard ICF Block
Suitable for multi-storey floors/apartments. Fully reversible.

350mm Closer
Standard ICF Block
Minimise thermal bridging with cavity closers designed to fit into 350m straight or corner ends.