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Adding a sunroom 3.7m internal, building contol regs seem to say min 170x47 joists. The existing sizes of the rest of the house is 195x38. Would there be any issue? Any need for 47mm timbers?

Looking at what size of ridge beam i require for my sunroom extension? Want to vault the ceiling. 4m out x3m wide extension, walls standard 100mm cavity 2.4m high span 2.4m betwewen wallplates internal, 2.6m span from outside of wall plates lenght of ext 3.75m int, so ridge will be...