Innovative Methodology with two components:Using Perlite as filler / insulation material in load bearing Structural Insulation Panels (SIP’s) instead of polyurethane so as to provide Type A Fire Protection,which enables the number of levels in a development to be greater than four,and:Using heavy duty hinges to solve manual handling problems caused by resultant heavier SIP’s and enable rectangular layouts of 4 interconnected load bearing Perlite-filled SIP’s to be swivelled into rhombus layouts to be transported by road and swivelled back to a rectangular layout for installation by crane