The video below hasn't actually been filmed by us, though shows the product in action.

The foam insulation shown above is an open cell foam, commonly used in America and Canada. The foam used in the UK is a closed cell foam and is much more rigid, the reaction time is slightly longer, expanding a little less to give a stronger, more thermally efficient result.

It is also worth noting that we do not as of yet cut the foam as shown in the video above, instead choosing to bring the foam thickness to within a few millimetres of the inside surface of the timbers. I.e. if the timber depth was 100mm, we would install a nominal thickness of 85-90mm to ensure that the foam expansion does not exceed the timber depth.