Insulating solid walls could heating costs considerably as solid walls let through almost twice as much heat as cavity walls do. It is common knowledge that buildings constructed before 1919 probably have external walls that are solid rather than cavity walls. Cavity walls differ in that they are made of two layers with a small gap or ‘cavity’ between them, whereas solid walls have no gap, which means they let more heat through.
Another way to tell the type of the walls is by measuring their width. Locate an external wall window or door. If the brick wall is less than 260mm in width, then it is most likely a solid wall, while if it is greater, it is probably a cavity wall. Fortunately for home owners as well as commercial developers, these days there are quite a few ways to insulate a cavity wall. Having said that – keep in mind that steel or timber-framed buildings require a different method of insulating. You can learn more about the different specifications and options after scheduling an appointment with United Builders Service.
Advantages of Interior Insulation
When choosing between fitting interior of exterior insulation, it stands out that the first is simpler to install on existing foundation walls. It is associated with lower material costs as well as contractors are given a wide variety of materials to choose from.
Disadvantages of Interior Insulation
On the downside, many types of insulation commonly used by contractors today require separation from habitable spaces by a fire-resistant material, since they are extremely flammable and release toxic gases if ignited. Their width also reduces usable interior space and it doesn’t protect the waterproofing membrane, making it prone to becoming saturated by moisture.
Upon fitting interior insulation, many property owners report the internal surface of the insulated wall tends to be warmer and reduces the likelihood of condensation forming. However, the areas where an external wall meets an internal wall will remain cold. That means that those areas remain prone to condensation forming, typically in high-level corners.
There are many options for internal wall insulation – from rigid foam boards (Kingspan or Celotex), to mineral wools (Rockwool or Knauf) and a number of natural materials, such as sheep’s wool, woodfibre or cork (try Ty Mawr). While rigid foams are better insulators than the rest and take less floor area as well as incorporate a vapor barrier, they are more expensive and don’t perform as well in terms of breathability as some of the other materials.