rsj size and support

[steve2012]

hi all,happy new year ,i have been asked by the other half to renew the kitchen and knock through into the dining room to make it all into one room,i have a solid single brick wall between the 2 rooms and a bedroom and bathroom above,all walls upstairs are stud walls.the stairs go up the middle of the house from side to side and joists run side of house to side of house resting on dividing wall.the stairway wall that is connected to the dividing wall is studwork. my question is,,how much of the solid dividing wall do i need to leave (stair end) to support the rsj ,the other end i believe i can rest on the inner skin of the exterior wall of the house,ie 100mm so that end sits just into the cavity.is this correct? the rsj would be approx 10ft long

 

[trowlerman]

not quite sure what you meen, but leave as much of the wall up as possible, the other end will be fine on internal leaf

 

[^woody^]

If the beam is not going as far as the party or external wall, then it will need enough wall to act as a pier, or as a butressed pier/wall

If you don't know how to work this out, then you will need to get someone to calculate it