In this paper, transient analysis on heat transfer across the
residential building roof having various materials like wood wool, phase
change material and weathering tile is performed by numerical simulation
technique. 2-dimensional roof model is created, checked for grid
independency and validated with the experimental results. Three
different roof structures are included in this study namely roof with
(i). Concrete and weathering tile, (ii). Concrete, phase change material
and weathering tile and (iii). Concrete, phase change material, wood
wool and weathering tile. Roof type 3 restricts 13% of heat entering the
room in comparison with roof having only concrete and weathering tile.
Also the effect of various roof layers’ thickness in the roof type 3 is
investigated and identifi ed that the wood wool plays the major role in
arresting the entry of heat in to the room. The average reduction of
heat is about 10% for an increase of a unit thickness of wood wool layer.