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Bauder Uninsulated Waterproofing Systems to be Used on Combustible (Timber Based) Decks

Important update.

Further to the Contractor Update dated January 2022, and as a result of our ongoing fire testing programme, we can now confirm that the uninsulated BTRS system comprising K5K and KSA DUO directly onto an OSB/3 substrate is now classified BROOF(t4) in accordance with BS EN 13501-5.

This means the system is now approved for use directly onto OSB/3 and plywood decks without the incorporation of a 6mm Magply board.

Bauder Uninsulated Systems Tested and Classified BROOF(t4)

RBM Systems

BTRS PLUS

  • KARAT, KSA DUO 35, OSB/3 (roof pitch 0° to 10°)

BTRS

  • K5K, KSA DUO, Smartply Max FR B OSB/3 (roof pitch 0° to 10°)
  • K5K, KSA DUO, 6mm Magply MSO Board, 18mm OSB/3 (roof pitch 0° to 10°)
  • K5K, KSA DUO, 18mm OSB/3 (roof pitch 0° to 10°)

Bauderflex

  • K4E, Sprint DUO, OSB/3 (roof pitch 0° to 10°)

Single Ply Systems

  • Thermofol U15 FR (mechanically fastened), GV120, OSB/3 (roof pitch 0° to 10° and up to 70°)

LAM Systems

LiquiTOP

  • LiquiTOP System (Dark Grey), OSB/3 (roof pitch 0° to 10° and up to 70°)
  • LiquiTOP System (Dark Grey), KSD DUO, OSB/3 (roof pitch 0° to 10° and up to 70°)
  • LiquiTOP System (Dark Grey), Thermofol U15, OSB/3 (roof pitch 0° to 10° and up to 70°)
  • LiquiTOP System (Dark Grey), K4E, OSB/3 (roof pitch 0° to 10° and up to 70°)
  • LiquiTOP 3 Coat System (Dark Grey), TEC DBR 06, OSB/3 (roof pitch 0° to 10°)

Other Systems Deemed to be Suitably Fire Resistant

Commission Decision 2000/553/EC identifies the following roof finishes as satisfying the performance characteristic of external fire performance without the need for additional testing:

  • Loose laid gravel with a thickness of at least 50mm or a mass of ≥80kg/m² (minimum aggregate size 4mm, maximum 32mm).
  • Sand/cement screed with a minimum thickness of 30mm.
  • Cast stone or mineral slabs with a minimum thickness of 40mm.

The DCLG document "Fire Performance of Green Roofs and Walls", referenced within the Approved Documents, states that a growing medium with a minimum depth of 80mm and an organic content not exceeding 50% is sufficient to comply with Building Regulation requirements.

Therefore, where a complete layer of any of the above materials is installed over a Bauder roof system, that system may be used without restriction from an external fire performance perspective.

Ongoing Testing Programme

Our fire testing programme continues, and any significant updates will be communicated as further results become available.

Paul Felgate
Product Manager
M: +44 (0)7702 874922
E:  [email protected] </