Using a perlite concrete slurry coat, the polystyrene insulation board is positively attached to the substrate and covered with a uniform layer of perlite concrete insulation. If the existing substrate is sound and capable of the additional loading required, then the perlite concrete insulation can be applied to the existing roof thereby eliminating costly tearoffs. F. Includes air films and roofing. Dead Loads include weightof metal, polystyrene and perlite concrete roof insulation. Dead loads of structural concrete are not included.
Insulation values are for summer conditions, heat flow down.
For sloped insulattion, calculate average thickness. The U factors shown are calculations based on thermal conductivity data derived from laboratory testing of dry materials in accordance with ASTM Specification C 177. The values shown are intended only as guidelines. Actual insulation performance for all materials and systems is affected by design of building, environment, and installation, and will be lower than calculated values. The system is rated as non-combustible by Factory Mutual.