Shelter is one of the main component of the living creature, it should be safe, uneconomical, hygenic and protective. Now a days shelter should be protective from blast load due to terrorist attack, nuclear explosive, chemical reactions occurring inside the building may be internal blast or external blast.A SDOF structural system subjected to blast load on Front wall, rear wall and roof is studied.The response of the structure is determined. The Pressure impulse curve is determined. Pressure impulse curve plays a vital role in determining the damage level of structure subjected to blast load.A LCS model is considered and studied. A LCS model made up of aluminium foam plays a vital role in the protection of structures subjected to blast load. A parameter of non dimensional parameters κ and τ are studied.A non dimensional parameters κ and τ plays a vital role in finding the damage level of the structure.