Hi, Im looking to build a timber frame extension at the rear of my Victorian mid-terrace house in Kent. The size is 3m x 4m (ish, just under for building / planning issues.) I will be placing frame on a 2 x 6 inch wall plate which in turn sits on foundation block walls ect. My question is do i need to use 2 x 6 inch timber for all walls and floor ect or can I drop down to 2 x 4 inch timber stud?
The construction im thinking of is timber stud 2 x 4 or 2 x 6 inch, then 18mm OSB board then vapour barrier, batons, then clad in cedral weather-board cladding. internally, 75mm insulation and 12mm plasterboard.
Also any comments on I-beams for floor and roof joists v's solid timber joists ( & sizes) would be most welcome.
other info you may require. flat roof with rubber-seal epdm so should be light weight. foundation blocks set in three rows, max. unsupported span over foundation is 2 meters.
many thanks for reading this, and any advise is greatly received.
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