Where did everyone learn about retrofit?

Am I proposing home clothing? Damart thermal under layers and full arctic gear for homes, able to be put on and taken off as needed?

I don’t know the sweet spot but most older structures are not very recyclable. Lead, copper and to a lesser extent glass, timber and other metals but the brick, mortar and concrete are usually only any good as hardcore, with a very energy inefficient system to crush them.

Physics at uni helped. Building science corp publications /videos. Manufactures offer some very good information to support their products.

I haven’t found many books though. I’d appreciate recommendations.

This is probably the best single video on building science I’ve watched.

It’s presented by Joe Lstiburek who founded Building Science Corp, a consultancy, in the US.

Another good one is: