Installing a shed can seem like a daunting process – from establishing a solid base to waterproofing and insulation – with the fear that you will end up with a leaning, leaking pile of timber.

Q: I’m going to build a storage shed. Actually, I’m building two sheds, as my wife wants her own cute garden shed. I’m wondering what to do about the floor of each shed. I want them to be waterproof, ...