BOX LINTEL ADVISE

[kelvos77]

I want to make a 1700MM meter opening in a loadbearing wall , which supports the a wall above and in the loft two timber supports rest on the wall.
is a standard load box lintel ok?
wall is 100mm
opening is 1700 mm
lintel is 2100mm
with a 150mm bearing each side , the lintel will rest about 1 meter each side of the opening

 

[Static]

Will depend on wall construction, height, size of roof bearing onto it, if floors bear onto it and other factors.. 1700mm opening should be do-able with an off the shelf lintel but specing which one will require a lot more info..