nellyville

Hello folks, Long time browser, first time poster. I’m wondering if anyone has been in a similar situation: We’re the new owners of an 1882-built mid-terrace in London that we’re in the process of refurbing, restoring and insulating. It’s got some pretty normal-for-age floor deflection but one part on the front reception room floor is worse than we expected. The surveyor said it was all normal settlement but now it’s not hidden by a sofa it looks stark. There’s about 10cm of deflection across a 2m span of floor and it looks to be because the joists here are not resting on brick supports like the rear reception room. Fortunately we have access from the cellar below and it seems as though the whole wall is resting on three timber beams(?) (green in my diagram). I’ve had a structural engineer visit who suggested either a steel running front-to-back or some sistering of the beams to support the joists above. I can’t see how we’d get a steel down there so I think sistering is the best/only course of action. So my thinking is as follows: use a car jack to gently prop up the joists from the cellar that should allow me enough room to get another beam to sit alongside the current ones on one side the beam will rest on the supporting wall then on the other side: I might need to remove a brick to create a pocket for the secondary beam to sit in, or use a joist hanger on similar Does that sound sensible? I’m a moderately competent DIYer but the structural nature of this work means I’ll probably defer to someone more skilled.