Q: I have a small house, and it needs a new roof. I can’t afford to hire a roofer. My house has shingles on it, and I can walk on the roof with little difficulty. I’ve never installed roof shingles.

Insulating a pitched roof or loft is one of the most cost-effective ways to improve your home's energy efficiency. Uninsulated homes lose around a quarter of their heat through the roof. Even if you ...