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Updating house insulation

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Most houses constructed after 1920 have a gap between the internal and external wall, and filling this cavity with insulation can save a typical gas heated, three bedroom semi-detached house around £140 a year in energy bills, according to the Energy Saving Trust. said unfilled cavities could be responsible for 35pc of all heat lost from the home and with the cost of installing cavity wall insulation at around £500, the expense is effectively paid off after a few years.

These mainly include lower-cost measures such as topping up the insulation in the loft (the Energy Saving Trust recommends 270mm of loft insulation), installing draught excluders in doors and windows, gaps around the floor and maybe even up a chimney, and installing or upgrading a set of heating controls on the boiler to control the home temperature." He said: “At the same time if your boiler is over ten years old then it might be worth considering an energy efficient boiler.Choosing how much insulation to add to your house can be confusing and will be influenced by the space heating energy savings you wish to achieve, the way your house is constructed, and your budget.This provides general guidance for achieving varying degrees of space heating energy savings by better insulating and air sealing your house.Providing you have no condensation or damp issues and your loft is accessible, this should be a job you can carry out on a DIY basis.Most people choose to insulate using insulation ‘quilts’ made from glass, mineral wool or natural wool — a depth of 270mm should be aimed for.“One way to tell if your insulation is not performing properly from the exterior of a house in the winter is the development of large ice dams, or large icicles, that hang down off of the overhang on your home,” says Arne Olson, owner of Houle Insulation in Minneapolis.

“If your home heats up quickly in the summertime, it is a sign that the insulation is not keeping the heat out of the house and it may be compromised.” Olson recommends hiring an energy auditor to see if your home needs more insulation or a complete replacement.

Attic floor insulation works as the main barrier to prevent heat from escaping when it spreads to the attic through a process called thermal flow.

A rule of thumb, visible floor joints mean you don’t have enough insulation, experts say.

Homeowners are becoming increasingly interested in improving the energy efficiency of their house to reduce costs, improve comfort and help protect the environment.

Many older Canadian houses are relatively drafty and lightly insulated, and this can result in higher heat losses and energy bills — even in those built more recently, between the 1950s and the 1980s.

Replacing an old gas boiler with an A-rated high-efficiency condensing boiler could save you as much as £310 a year.