A third of all the heat lost in an uninsulated home goes through the walls. If your house is older than the 1990’s it may not have any wall insulation at all.
Source: Wall insulation @ Energy Saving Trust
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- Free Insulation and Boilers: Boilers, loft & cavity wall insulation for free @ MoneySavingExpert.com
Excerpt: Cavity wall insulation: most homes built since 1920 have a gap between internal and external walls. Filling the cavity with insulating mineral wool and foam means cold air’s kept out, and warm air stays in.
Image by Bios (talk · contribs) [GFDL or CC-BY-SA-3.0], via Wikimedia Commons
