Spray Foam Explained

Spray foam roof insulation is a 2 component expanding polyurethane system, consisting of 2 specialised liquid chemical components. These components are contained in steel drums transported to site on our specially equipped vehicles, and are contained on the vehicles throughout the installation process. Once any required roof work is completed our highly trained installers begin the process of setting up and installing the spray foam.

Polyurethane Foam System

2 Part Foam System


Along with the chemical components, our vehicles also contain all the specialised machinery required to install the finished foam product. This machinery is only used by installers trained to set up and dispense the foam system, as the temperature, pressure and proportioning of the machinery are critical to the correct installation of the foam.

When setting up to install foam insulation, the liquid chemicals are pumped from their containers into the proportioning area of the machinery, this ensures that the liquid components are sprayed at exactly the right proportion to give a high quality foam with the best insulation values. Once the components are proportioned they are then pumped through to the heating area, again the components must be heated up to the correct temperature to reduce viscosity and deliver a high quality polyurethane foam to the roof. When the components are correctly proportioned and heated they are then pumped down the hose, which again is heated to ensure high quality, to the triggering mechanism which by now will be in the loft. Only when our installers are happy that everything is correct will they begin to install the foam insulation to your roof.

Machinery used to deliver foam insulation

Specialised Foam Machinery


In order to install the foam insulation to your roof, our installers ensure that the correct air pressure is reaching the triggering mechanism before beginning the installation. When the triggering mechanism is initiated the 2 chemical components are pumped from the hose through the mixing chamber, this mixes the components together before they are pumped at high pressure onto the roof. As the chemicals reach the roof they are still in their liquid form, allowing them to seek and seal gaps and form a continuous bond with the roof, almost immediately they will begin to expand and cure to form a rigid polyurethane foam which adheres to the roof and bonds the roof together to provide extra strength and rigidity.

Once the foam is applied to the roof, within a few minutes it will be touch dry and look more like the finished product. After 24 hours the foam will be completely cured and will form the lasting bond with your roof, allowing us to provide our 25 Year guarantee.