Hard to Treat Cavity Walls

Posted by: Foamseal Ltd
Related Product: Spray Foam Insulation

Millions of homeowners have already had cavity wall insulation installed but there are still vast numbers of houses that cannot be treated with low cost standard insulation measures because these materials are unsuitable due narrow cavities, the age of the property, construction type, risk of rainwater ingress into the cavity due to severe wind driven rain exposure conditions, or the properties are at risk of flooding.

These properties are generally referred to as being hard-to-treat or as having non-standard cavity walls but can be treated with Technitherm® high performance closed cell polyurethane cavity wall thermal insulation.

The Green Deal is set to revolutionise the energy efficiency of properties in Great Britain, giving the consumer energy saving improvements at no upfront cost, paying instead through their utility bills savings (The Golden Rule).

The Energy Company Obligation (ECO) now provides an incentive to all homeowners of (HTT) hard to treat cavity wall properties to incorporate energy efficient cavity wall insulation.

In the Electricity and Gas (Energy Company Obligation) Order 2012 “hard to treat cavity” means:

A cavity wall:

  • in a building with 3 or more storeys where each storey has cavity walls;
  • which a chartered surveyor has reported is not suitable to insulate with standard insulation material or techniques; or
  • which a chartered surveyor has reported is not suitable to insulate without substantial remedial works to the building;
  • a cavity which is less than 50mm wide;
  • a cavity found in homes of prefabricated concrete construction or with metal frame cavity walls; or
  • an uneven cavity formed in walls constructed of natural stone or from natural stone.

Many Local Authorities and Housing Associations have been installing Technitherm® high performance closed cell polyurethane cavity wall thermal insulation in their HTT properties for many years.

Stuart Pye, Home Improvement and Energy Solutions Manager, Blackburn with Darwen defines Hard-To-Treat-Cavities (HTTC) as being:

  • either sub 50mm cavities or cavities of variable width
  • random stone and coursed stone properties
  • or having no damp proof courses, which cannot be insulated with standard insulation measures
  • any cavity wall with structural problems caused by failing wall-ties due to water penetration into the cavity
  • any cavity unsuitable for traditional cavity insulation measures due to exposure to high wind driven rain conditions
  • any cavity wall in homes at risk of flooding
  • any unsuitable for external wall insulation due to planning restrictions and structural problems
  • any unsuitable for internal wall insulation due to unacceptable disruption of tenants, reduced floor areas, and costs of relocation

If you believe you have a hard to treat cavity wall and wish to access Green Deal or ECO funding then give one of the team a ring on 01892 882 540.

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Information Updated on: 8 May 2013