Yes, in some cases it may be possible to top up the cavity wall insulation because it can shrink over time and may become less effective.
It works by filling the gap in-between the outer wall and the inner wall. It stops heat loss in your home by keeping air trapped within the cavity.
If moisture gets into the insulation its ability to keep the house insulated and warm is diminished.
Yes, you can but it will be a lot of work and planning. It is recommended to get an expert to do it because mistakes can cost a lot of money to rectify.
Cavity wall insulation is installed by drilling holes into the side of a building. The insulation is then injected into the wall.
Cavity wall insulation is made of mineral wool.
No, it is classed as an irritant because it can irritate your eyes and skin, making them very itchy.
Cavity wall insulation can be highly flammable, but because of advances in the production of insulation, it's fire retardant with a melting point of 1093 degrees C.
Cavity wall insulation can cause dampness if installed incorrectly.
Yes, it is definitely worth it. After it has been installed you will save energy and cut the cost of your heating bill.