I am currently trying to extend 2 rsj's which are supporting my joists in a old terraced house. I have exposed the beams and want to know if it is possible to extend them so they sit on existing internal wall which is close on to 100 years old. At the moment they sit onto a newly built pillar which takes up about 3ft by 1ft in the lounge (space which we really need). If it is possible how do you bolt more steel to the ends of the existing rsj's to make them about another foot longer.