I want to take out a 3m wide wall that separates my lounge and dining room. In other words a bigger lounge .The ceiling joists join at this wall but there is loading from the roof on it only the ceiling. I was wondering what size Header to use as I would like to put it in the ceiling so I don't loose head hight.The point where the Header is supported is at the other wall junction points.
don't know how strict the building codes are there but two 2x12's should work. that said without seeing exactly what kind of roof you have or exactly how it is supported. you might have to go with a laminated beam. I used two 2x12's nailed together -nailed in the attic to the walls To flush it all up i used a 2x6 nailer on the bottom of the beam to help blend the marriage joint on the drywall material. THis was over an 18' span. I have had no problems and it has been many years.