Declarations of Performance for Natural Slate.

BS EN 12326-1:2014

On 31st January 2020 the United Kingdom officially left the European Union.

Prior to this Construction Products had been regulated under EU 305/2011 and its associated Harmonised European Standards.

The UK retained a form of Construction Products Regulation and in doing so assigned Designated Standards in support.

BS EN 12326-1:2014 covers Slate and stone for discontinuous roofing and external cladding – Part 1 Specification for slate and carbonate slate.

The conformity of a slate to the requirements of the Designated standard is stated in the associated Declaration of Performance (DoP).

The DoP lists the values from testing which the supplier declares in support of the products use and performance for a given application.

Actual test methods such as Thermal Cycling (Freeze/Thaw), Water Absorption etc. are described in BS EN 12326-1:2014

Local Authority Building Control enforces these regulations, so you’ll need to check the slate carries the UKCA (or CE) Mark, and your supplier provides a Declaration of Performance.

Please note that UKCA Marking does not indicate the quality of a slate, but that it has been tested to BS EN 12326-1:2014, the bare minimum legal minimum. Find out more about the BS 12326 tests here.

In summary:

  • All SIGA slates are tested to BS EN 12326-1:2014.
  • All SIGA slates carry the UKCA Mark
  • Every crate of SIGA slate is marked with EN test results
  • All SIGA slates are classified as W1 (≤ 0,6%) for water absorption
  • All SIGA slates are classified as T1 for minimal surface corrosion
  • All SIGA slates are classified as S1 for carbonate content