What is LPS 1181 Part 1 and why is it important?
This document stipulates the requirements & tests for built up cladding and sandwich panel systems for use as the external envelope of buildings, for compliance with the LPC Design Guide for the Fire Protection of Buildings. Products/Systems achieving an EXT A grade have met the requirements of both reaction to fire (LPS 1181:Part 1) and resistance to fire tests eg. LPS 1208, and have therefore demonstrated their ability to withstand a fully developed fire for the specified period. Even in a fully sprinklered building, a roof system would need to achieve an EXT A grade approval of 30 minutes integrity and 15 minutes insulation to meet the minimum fire resistance requirement in the ‘Protected Zone’ either side of a compartment wall. For non-sprinklered buildings, such as retail warehouses, superstores and those for industrial use, the requirement would rise to 60 minutes integrity and insulation. Note:Products/Systems achieving an Ext B grade have only demonstrated their ability to pass
