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THERMAL RENDER PLASTER. INTERNAL, EXTERNAL INSULATION OF OLD STONE WALLS
Bauwer thermal render plaster available directly from the manufacturer, Bauwer Group. Contact us for a competitive quote, our prices per square meter coverage at a given thickness will deliver considerable saving vs. popular stone wall insulation alternatives
Bauwer Group provides insulation materials as well as advice on traditional solid masonry walls insulation. Traditional solid wall is typically the most difficult and in many cases the least cost effective part of a cottage to insulate. However, adding Bauwer vapour permeable insulation to solid walls can lead to a significant reduction in heat loss without causing long-term condensation, moisture and dump issues.
Most traditional buildings are made of permeable materials and do not incorporate the barriers to external moisture such as cavities, rain-screens, damp-proof courses, vapour barriers and membranes which are standard in modern construction. As a result, the permeable solid walls tend to absorb moisture, which is then released by internal and external evaporation. When traditional buildings are working as they were designed to, the evaporation will keep dampness levels in the building fabric below the levels at which decay can start to develop.
Permeable materials such as lime or Bauwer thermal render, plaster act as a buffer for environmental moisture, absorbing it from the air when humidity is high, and releasing it when the air is dry. Modern construction relies on mechanical extraction to remove water vapour formed by the activities of occupants.
As traditional buildings need to ‘breathe’ the use of vapour barriers and other impermeable materials (EPS boards) commonly found in modern buildings must be avoided when making improvements to energy efficiency, as these materials can trap and hold moisture and create problems for the building.
If the walls are already damp before installing impermeable insulation these effects will potentially be exacerbated. Under these circumstances it is particularly important to allow walls to ‘breathe’ in order to dry to the outside as effectively as possible. Drying to the inside is significantly less effective, and may be unpleasant for users of the building.
For traditional buildings with highly permeable external walls, the need to prevent impermeable layers precludes the use of modern EPS or foam based insulations boards, as well as the use of protective finishes which bar moisture vapour movement. As most suitable external insulations will also need to be protected from external rain and from mechanical damage, external insulation should be considered as a two-component system where all layers need to work together in harmony. First insulating layer is Bauwer Light, which need to be protected from both the weather and mechanical impact with vapour permeable Bauwer Finish. Internal wall insulation is usually applied directly to the inner face of the external wall (Bauwer Light or Bauwer Standard) and then a Bauwer Finish is applied to the room side
