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Ideal insulation to be used in between joists 9x2 in loft then floor over Same with 4x2 rafters then plasterboard over top Please advise

Can I use a triple or quad 9x2 flitch beam 2 steel plates instead of steel rsj over 4.7 metre To sit on timber internal Walls cut out existing rafters and support roof back down to this along with new timber joists coming off this

Can flitch beams be installed without a steel plate on to timber frame internal wall thinking of 3 number 9x2 bolted together then new joists off