Ceiling Insulation. A high density, two-component Spray Polyurethane Foam (SPF) - must be applied to the underside of the roof, this is to be 20-30mm thick and as per requirements for the application of the SPF Foam - The ceiling system must perform adequately in terms of fire propagation properties according to the SANS 428 protocol, using the test specifications as contained in SANS 10177-10:2007 SOUTH AFRICAN NATIONAL STANDARD. Fire testing of materials, components and elements used in buildings. Part 10: Surface burning characteristics of building materials using the inverted channel tunnel test. - A gypsum ceiling board must be at most 6.4mm in thickness and have an R value of 2 or above) for cold area, system should be affixed with steel branding to roof purloins directly under and at pitch of roof. - Finishing strips/cornices should be fixed to ceiling boards (and not to walls), - The gypsum ceiling board should be finished with a non-acrylic ceiling paint. - The required gypsum board to be used must be standard for all households.
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Sources: Nec3 Engineering & Construction Contract, Nec3 Engineering & Construction Contract