Part of Historic Environment Scotland

How to insulate stone walls



Well cared for buildings are far more energy efficient. So it’s best to make sure you’re maintaining your property well before thinking about adding insulation or making other improvements.

Where to insulate first is worth some serious thought. Insulating the walls should be last on your list, as other measures are often cheaper and easier yet also effective in improving a building’s energy efficiency.

If you decide to insulate your walls, there are a number of wall insulation options, some of which may be suitable for your property:

  1. Original or highly decorated internal walls are often best treated by blowing insulation behind the wall lining.
  2. If it’s not possible to insulate behind original lath and plaster walls, one option is to apply insulation onto the existing wall linings.
  3. Where a wall was originally plastered ‘on the hard’ (directly onto the masonry), you can apply insulation directly onto the plaster surface.
  4. Where original lath and plaster wall linings are damaged or have been removed, there may be space to hold insulation in place with framing.
  5. External wall insulation may be suitable for a harled or rendered building if the finish is failing.

Traditional stone buildings need to be able to absorb and release moisture to prevent decay of the building fabric. Whichever insulation option you choose, it mustn’t interfere with this process.

Ventilation is also necessary in traditional buildings, and a balance needs to be struck between air circulation and warmth.

  • Next
  • Maintaining your property

  • Share this: