Originally Posted by
luckyjim
We ran shade cloth down one side of our house ( the neighbours side, who we don't like; fuk e'm they can look at it) and it dropped the temp by a couple of degrees.
IMHO it depends how much money you want to spend.
Unlimited funds = knock it down and rebuild. At least the top half. It's not attractive.
Insulation is relatively cheap and easy to install. Do the roof space.
Install a whirly gig thingy, you know one of those extractor things. They make a big difference.
Whilst you say it's the walls that are the problem I think the roof space is the biggest problem.
As previously mentioned by others, far more knowledgeable than me, evacuating the heat is what it's all about.
I think building new walls, interior or exterior, is a nonsense.
Me, I'd take off the top floor and rebuild. I reckon it'd be cheaper, you can reuse some of the materials, easier, and cleaner all round.
BUT
Don't use the dimwit cousin. You have to put your foot down on that.
Seriously.
If you don't sort that out her extended family are going to take you to the cleaners.
Good luck