There are many ways to insulate a wall to reduce heat loss. A quick overview of them can be seen if you hover over the description...
If you insulate a wall from the inside the thermal insulation is the critical factor, but you must also realise that by doing this you change the breathing dynamics of the wall and the dew point (where water forms) can then move in the wall and potentially cause moisture to be present at any depth in the wall. Often this means that water forms as condensation just where it should not – a real risk for catastrophic failure of the system.
Cavity Wall Insulation
Fast, economic, grant funded but only for cavity walls with a proper cavity. You fill the cavity with an insulating material. About £10/m².
External Wall Insulation
Excellent energy savings, changes appearance completely. You place insulation boards and render over the facade. About £80/m².
Thermal Roll Insulation
Minimal thermal upgrade as the insulation is very thin and forms a vapour barrier so it has condensation risks. You wallpaper the walls with a roll of thermal foam. About £40/m².
Thermal Dry Lining
Use a dry lining plasterboard, with a vapour barrier and some insulation in the gap. Cost effective but real risk of water damage in the construction and condensation in the room. About £50/m².
Wood Fibre / Particle Boards
Combination of wood particle and insulation panels fixed to the walls. Good environmental credentials. Deep section takes a lot of space and high risk of moisture related damage. About £130/m².
Breathable Internal Wall Insulation
With iQ-Therm you can upgrade to exceed legislation and be sure to avoid moisture related problems in your walls. Warm walls, breathing buildings. About £120/m².
