Injection Foam Insulation

Professional insulation services

Injection Foam Insulation (Aminoplast) for Cavity Walls

Aminoplast injection foam is a specialised insulation material designed primarily for filling cavities within wall structures. It is injected in liquid form and flows easily into voids, filling the entire space without exerting expansion pressure on the surrounding structure. Unlike polyurethane foam, aminoplast does not expand aggressively, making it a safe solution for delicate or existing wall constructions. Once set, it forms a lightweight insulating structure that improves thermal performance while maintaining the wall’s natural behaviour. One of its main advantages is vapour permeability. Aminoplast insulation allows walls to “breathe,” helping to prevent moisture accumulation inside the structure. This makes it particularly suitable for older buildings or situations where moisture control is essential.

This method is ideal for improving thermal performance without removing or altering the exterior facade of the building.

Technological advantage

We strive to deliver our work professionally, placing strong emphasis not only on high-quality certified materials but also on the quality of installation. Cavity wall insulation, as a hidden part of the structure, requires a high level of expertise. Each wall cavity is different and may have specific technical characteristics, so carrying out insulation work without proper experience can lead to poor results and potential damage.
A professional installer must understand cavity filling techniques, ensure insulation is completed without damaging the façade, avoid leaving unfilled areas, and properly inject foam into cavities that may already contain other materials such as cellulose, chaff, or polystyrene beads. Drilling must also be carried out according to precise technical spacing requirements.
In 2013, Termas specialists completed official professional training by the German manufacturer Aminotherm for working with injection foam insulation systems. Combined with over 11 years of practical experience, this ensures high-quality workmanship. Extensive testing has also been carried out to evaluate the effectiveness of injection foam in insulating cavities that already contain other materials.

Injection foam insulation process

Small holes (16–18 mm) are drilled into the mortar joints of the brickwork without damaging the bricks.
Drilling starts from the corner of the wall, typically 30–50 cm from the side and 30–50 cm above ground level. Additional holes are drilled approximately every 1 metre horizontally and 0.7 metres vertically. If there are obstacles in the cavity or variations in cavity width, the number of holes may be increased.
Before filling the cavity, a quality check is carried out using the prepared foam. A test is performed by filling a 5-litre container, where the net weight should be between 200–230 grams. Smaller containers can also be used, with proportionally adjusted weight.
The filling process begins from the lowest row of holes. Indicator rods are used to monitor the filling progress. Foam is injected until the indicator shows movement, confirming that the material has reached the adjacent cavity area. The cavity is filled layer by layer, gradually moving upwards.
Once the process is complete, all drilled holes are sealed with mortar to restore the original appearance of the facade.

Excellent Cavity Fill Performance

The foam fully fills the cavity, eliminating cold spots and improving overall insulation efficiency.

Breathable & Moisture Safe

Aminoplast foam is vapour permeable, allowing walls to “breathe” while preventing moisture build-up and condensation issues.

No Expansion Damage

Unlike spray foam, aminoplast does not expand aggressively, making it safe for cavity walls without risk of structural pressure.

Ideal for Existing Homes

Perfect for retrofitting older properties with cavity walls, without removing plaster, bricks, or cladding.

Improved Energy Efficiency

Reduces heat loss through walls, helping to lower heating bills and improve EPC ratings.