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Custom Insulation Boston Worcester Blog

Insulate Wall Cavities and Crawl Spaces for a Warmer Home – Boston, Worcester

1 October 2013

Too many homes have cavity walls - which means there's a gap in the middle of exterior walls - and filling them with insulation can make your home more energy efficient. This means reduced heating costs, and you'll be making your house 'greener' in the process.

Finding out if your home has cavity walls isn't hard. In general, houses built after 1920 do, and those built before don't. However, you can't tell by the house's age alone.

Look at the brickwork - if the bricks are all long (whole) ones, then the walls have a cavity in the middle, but if the bricks are both long and short ones, there's no cavity because the short ones go through the wall.

Adding wall cavity insulation will produce significant savings on your home heating bills. But the walls need to be in good condition and not exposed to driving rain, and the cavity must be at least 5cm deep.

Homes less than 10 years old should already have cavity wall insulation. If you're not sure about yours, contact an insulation specialist.

Keep in mind this is not a DIY job. A insulation specialist should add the insulation. They'll do this by making small holes in the external walls, blowing insulation material into the walls and then filling the holes. As long as all the external walls are accessible, the job should only take a few hours, depending on the size of your house.

Insulating homes with solid exterior walls (usually brick or stone) is more expensive, but the savings are greater.

For more information on adding insulation to wall cavities and crawl spaces, contact Custom Insulation.


Insulation helps keep your house cool in the summer!