Repair principles and solutions for heritage buildings


When we refer to heritage, we typically mean buildings or structures that require preservation because of their historical, architectural, cultural, aesthetic or ecological value. It is our duty to preserve these buildings for future generations.

The objective of preservation is to deliver a long-term remedial approach which ensures both aesthetics and structural integrity are maintained.

Determining how the building envelope operates creates a clear picture on the best method for remedial solution. How the exterior and interior interact with environments along with functional purposes must be understood to ensure there is no endangerment to the operation of the envelope.

Every building and structure’s envelope is unique.

Design considerations should incorporate a holistic approach that encompasses:

  • The building/structure
  • The defects
  • Materials within the structure
  • Does the structure have historical/architectural significance?
  • Building Regulations
  • Listing requirements
  • Future maintenance requirements
  • Occupants requirements

The Delta system has been specified in numerous buildings and structures in both grade 1 and 2 listed and of historic value throughout the United Kingdom due to its sympathetic advantages. Delta’s ‘air gap’ technology is favoured by English Heritage, The Society for Protection of Ancient Buildings (SPAB) and local authority conservation officers.

The Delta System itself does not need any aggressive preparation therefore it will not create damage to historical or heritage structures.  The Delta System is a fully reversible system, which can easily be removed at any time, retaining the structure underneath intact.

A Delta System is not a replacement for lime render. The Delta System is a compromise, for when lime renders are inadequate in given situations, for example on below ground structures, on structures that have heavy salt contamination and on structures that cannot be effectively repaired and water/damp-proofed sympathetically and adequately from the outside (for example where there are architectural features that cannot be altered).

Delta along with our elite team of Registered Installers has the experience and knowledge to undertake waterproofing and damp proofing works for historical buildings.

Our Projects include

  • Museums
  • Royal Residencies
  • Collages
  • Grade 1 and 2 listed properties
  • Vaulted structures
  • The London Underground
  • Tunnels (such as the English Channel and Gotthard)
  • Forts and Castles
  • Country Estates
  • Barn Conversions
  • Observatories
  • Broadcasting institutions
  • Parliamentary Buildings

Who we are

Delta Membrane Systems Limited provides a full range of waterproofing and damp proofing solutions for architects, specifiers, developers, contractors and homeowners on new, retrofit and refurbishment construction and in flood resilience.  We also supply ground gas protection membranes protecting structures from harmful ground gases such as radon, carbon dioxide, methane and hydrocarbons.

Customer support

Our trained design consultants will work with you to achieve the best results for your project. If you want us to look after everything we can from design, supply & Installation, with this option you receive our insurance backed warranty. As manufacturers of quality systems, it is imperative to work with quality installation companies. At Delta we pride ourselves that we’ve built a team of highly qualified, reliable approved Registered Installers who operate throughout the UK, who specialise across our sector.

Our CSSW qualified technical team are always on hand to ensure your specifications are suitable for each project and delivered in a timely manner.