Terrace Victorian - Room Insulation

colinryan

Hi,

I'm replastering and insulating a number of first floor rooms in a terrace red-brick and would appreciate some opinions/guidance:

I am putting insulation backed boards on the exterior walls of course. New low-e double glazing in.

Is there any value in putting the same insulation backed boards on the interior walls that I share with neighbours i.e. a stone wall and platered must transfer a lot ofheat between buildings .... I think I can get away with a 30mm insulation backed board without taking up too much room (dont want to dryline) or is this overkill?

Is there value in insulating the floor on the first floor (bedrooms)? My logic is that this will keep more heat in the rooms below (living rooms) where it is more needed? I presume rockwool roll-out insulation is the easiest to use here (and will avoid having to lift every single floor board).

All thoughts appreciated,

C.

antoinolachtnai

The main benefit of insulating floors is to reduce the noise and rockwool does a good job for this. I wouldn't bother for the heat.

colinryan

Any thoughts on insulating terrace walls?

antoinolachtnai

Again for noise. Can't see the point for heat, unless you anticipate your house is going to be more than 10 degrees higher in temperature than your neighbour's during the winter.

Remember, the mass of the wall also provides a store of heat that will warm up during the day and radiate in the cooler night.