I wish to knock down part of a wall joining my conservatory to my converted garage. The span of the opening is 2.4m so I propose to put in a lintel or RSJ of 2.7m total sitting on padstones. The wall is single skin brickwork and is what would be the exterior wall of the garage; the inside being just a cavity then timber studwork insulated and plastered. The garage has a pitched roof which is supported entirely on the two end walls so the wall which I need to partly remove has no load from the roof i would presume. I do need to however support the single skin brickwork above going up to the apex of the roof and wondered if a concrete lintel would suffice or to use an RSJ? Would a 152 x 89 suffice to hold the apex up? Thanks