I had a thread on ebuild about a dodgy first floor room where the joists had not been properly supported when the wall brow was taken out. Well its probably (a lot) worse than that. http://www.ebuild.co.uk/topic/18951-existing-floor-joists-not-tied-into-new-structural-beams/   As part of the rear and side extension the rear corner ground floor wall was taken out and steelwork inserted to support the first floor and roof. I had discovered that the floor joists were not properly supporte