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How to fix creaking first floor

Anonymous user 15 April 2022 - 1.29 PM

Currently in a 4 bedroom, 2 bathroom new build property that's timber-framed and brick clad property (2 years old). Entire first floor has been creaking since moving in. There are areas where it also dips and flexes quite a bit. HNBC have agreed that the floor hasn't been built to manufacturer's specifications/recommendations. Builder appears to have walked away at the moment. Various reports have confirmed that:- Floor cassette has not been built to spec - 15mm OSB sub-deck appears to be weather damaged and not properly glued and fixed to joists. 22mm Floorboards not laid in alignment with joists or fixed in any way. Before getting anyone in to get any detailed quotes, I would like to get a rough idea of what's involved and rough timescales etc. to carry out and complete the remedial works. Would it involve stripping the entire top deck of the house (walls, bathrooms, cylinder cupboard) in order to remove and re-lay OSB and floorboards, and then re-install everything? Or would works involve working from room by room? Although possibly less disruptive, I personally don't think this is the correct way to do it, and could cause further issues down the line. Obviously I'm open to professional advice on this though. Approximate first floor area is 624sqft. All internal walls are stud and apparently not load bearing. There is 1 main bathroom, 1 en-suite and a cylinder cupboard on the landing. Armitage Building & Carpentry - Floor cassette is made up of standard i joists @ 600mm centres and 15mm OSB boards. There's no lateral support in it. Cassette was craned into place during build and then 22mm Caberdek laid over the top. OSB hasn't been glued/fixed to joists properly from factory and is blown at the edges raising the boards. Caberdek hasn't been laid in line with the joists, so edges finish in between joists. T&G has been glued but there's no fixings in any of them at all. Not even around room edges. If it was taken up room by room, would that mean additional bracing between joists would be required around the walls of each room as well? Also, whatever happens, we've got 6mm ply and Karndean fitted which will need ripping up just to get to the subfloor!

4 answers from MyBuilder tradespeople