Built Up Roofing Systems

In the construction of warm roofs (aka built up roofs) the principal thermal insulation material lies immediately beneath the weatherproof covering and on top of the roof deck and any vapour control layer necessary i.e. above the structural deck. The deck and cavity are thus maintained at warm temperatures during the winter hence the term warn roof. Liquid applied waterproofing systems are used as the external waterproofing finish. Many of the LRWA members offer a complete Built Up Roof system that uses a cold applied adhesive to bond the components, thus minimising fire risk compared to some traditional felt built up roof systems.

For more information regarding the use of liquid applied waterproofing systems as part of a built up roof please refer to the LRWA Code of Practice for Roofs which is available to download.

Built-Up Roof System in Detail

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Built-Up Roof System – The Benefits

  • Cost effective
  • Easy to apply with minimal disruption to building occupants
  • Fire and impact resistance
  • Hard wearing, decorative, skid resistant finishes
  • Tough and UV resistant with excellent colour stability
  • Capable of bridging cracks and joints
  • Easy to clean