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This Report describes different methods for calculating adequate space separation between buildings. It has been prepared in support of Approved Document B4 to Document History. Detail Summary. View all details. Active, Most Current. EN. Additional Comments: SECOND EDITION. Format. Details. Price (USD). PDF.Part 2 contains a reproduction of - Fire Research Technical Paper 5: 1963 - Heat radiation from fires and building separation. Also known as BR187. is 4.25m (by interpolation). Boundary distance 4.2m. Alternative approach using Appendix A of BR 187. The total area of unprotected areas is 12m2.