To insulate an existing wall, you are looking at 3 major options:
Whichever method you choose, the insulation needs to be put in place with the greatest care. Poorly applied insulation may cause mould problems or 'thermal bridges’, i.e. points where the insulation barrier is interrupted.
In the city, especially when you live in an apartment, it is easier to insulate an existing wall from the inside than from the outside. Nonetheless, stay on your guard as insulation from the inside may have disagreeable consequences if handled the wrong way.
The bond between the wall and the insulating material needs to be perfect and the wall needs to be completely sealed and waterproof. It also needs to resist rising damp and torrential rain. Get a professional in to make sure your home complies with applicable requirements before you start work.
More than anything, the price to insulate an existing wall depends on the technique adopted and the materials chosen. On average, external wall insulation costs twice as much as interior wall insulation.
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