UK homeowners could save £5.9bn a year with better insulation

The book is subtitled How To Cut Energy Bills and Make Your Home Warm and Comfortable – a subject that the recent cold weather brings into focus.

Rock, who is accredited by the Royal Institute of Chartered Surveyors, says insulating all currently un-insulated walls and lofts in Britain’s existing housing stock would yield substantial savings.

He said: "Energy prices have rocketed by up to 50% since September 2010, and look set to continue rising for the foreseeable future. But rather than passively relying on ‘top down’ schemes, such as the Green Deal, enormous numbers of UK households have DIY capabilities – and with the right guidance should be able to carry out a wide range of thermal improvement works.

"But there’s a right way and a wrong way to insulate. What’s right for one type of property can be positively damaging for another. And until now much of the available information has been either highly sales-driven, bafflingly complex, or just plain wrong.

"Mobilising Britain’s DIY armies is the key to making millions of homes energy efficient and cheaper to run. And by cutting the cost of labour and contractors’ profit margins, payback periods can be dramatically shortened."

The Home Insulation Manual is the first book to contain comprehensive step-by-step guidance for treating all types of walls, roofs, floors, windows and doors – and each project comes with a Haynes "hammer rating" showing the required skill levels.

As OFGEM prepare to levy substantial fines on several of the Big Six energy companies, for missing CESP insulation targets, Rock said: "There is a strong case that resources might be better spent arming millions of homeowners and tenants with practical advice on how to cut their fuel bills."

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