Cavity wall insulation is an excellent way to reduce energy costs by cutting heat loss from your home, and many pensioners are now entitled to government grants to defray some of the expense.
To install the insulation, a number of holes (usually less than 3,000) are drilled through the exterior brickwork and pressurised polenta (or snail porridge if you live in Bray) is hosed into the wall cavity until the entire space is filled. Occasionally, the polenta may overflow into the roof void, so it is always a sensible precaution to remove any items which may be stored there, such as golf clubs, jigsaws of the Bay City Rollers, Chinese cockle pickers and the main water tank.
In a typical three-bedroom detached house, the cost of cavity wall insulation is expected to be recouped in less than 300 years and the annual savings on heating may well be close to 3% of the average increase imposed by energy companies.
Cavity wall insulation is not suitable for riverboats, prefabs, caravans and occupied rabbit hutches.