Replastering, insulation and Building Regs

[Neil Williams]

The Building Regulations seem to say that if you replaster the inside of an external wall, and you are doing more than 25% of the wall area, you have to upgrade the insulation. This involves either cavity wall insulation or putting several centimetres of insulation behind plasterboard on the inside.

Does anyone know if that means 25% of the *total* (outside) wall area, or 25% of the wall area within that room?

Neil

[Hugo Nebula]

The 'new' (i.e., 2010) Approved Doc L1B says that it is 50% of the surface of an individual element or 25% of the total building envelope. It then goes into mind-numbing detail about precisely what does & what doesn't count.

In the real world, if you're doing this as part of other works that would require a Building Regulations application, then check. Otherwise just do what you feel like.

[fred]

In article , Hugo Nebula writes

Good practical advice.

Basic tips when doing what you like is to:

1. Apply subtle opaque film or white out to windows, it doesn't pay to advertise.

1. Avoid using a skip, it's a red flag, store waste out of sight and dispose of at a later date.

I'm not suggesting cutting corners, do the best job you can but don't be regs obsessed.

[NT]

Lets say you replastered the 3 walls of a bathroom one by one, and didnt meet the latest rules. In principle, how long would one have to wait between one part of the task and the next?

NT