Is it worth it?

[Ed21]

Quick question. 

I've been adding 50mm internal Insulation using the warm batten method and have added an
extra bit on the internal perpendicular walls to deal with any breakthrough from the outside.
In some cases there is not much wall left uncovered. 

The wall the other side is another heated room, so only thing I can think of it helping with is any cold
rising through the wall from below the floor or would such insulation (on both sides) prevent the wall
from warming up and making things worse.  

is there any advantage or disadvantage to just doing the last bit as well and just cover all walls?

Thanks in advance

Ed 

Edited March 18, 2021 by Ed21

[Mr Punter]

I seem to remember reading the cold bridges only run for about 1.5m along the walls and not worth doing more.  Also, you have to consider having a step in the wall, re-doing the skirtings and loss of internal space.  My feeling would be to do just external walls.

 

Does warm batten mean battens on top of insulation so you have service cavity?

[Ed21]

Yes it's 50mm Insulation then 25mm battens and plasterboard on top of that. 

The walls are dry-lined/battened anyway, so the step isn't an issue just means
a slightly thicker batten.  Current plan is to use a sheet of 25mm which will give 1.2m
along the wall and 18mm battens on top with 43mm battens on the non insulated bit
to give a level wall. Skirtings are all off so the additional depth would be 25mm.  

The 1.5m, is a good bit of info, so reckon 1.2m full sheet is a good compromise  

[Ed21]

Just thought I'd update this. 

Although the whole  lot was being covered the non-insulated part just looked wrong,
so I ended up doing the lot