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Uneven chipboard sub floor

Posted by Gary Poague, on
Hi, I am a woodfloor fitter that uses this site. I am after some advice from a reputable builder. I am fitting flooring in a new build 3 story house. The top floor and second floor have chipboard subfloors on joists. Now the chipboard looks like my 8 year old daughter has fitted it. But obviously the house passed building inspection. The chipboard literally Ramos up to the edges of the rooms and dive to the middles by roughly 6mm at best. They have cut the chipboard flush in doorways and started new boards and put gaffer tape over the joins which seem to be unsupported as you can push down on the join to a certain degree. And in the hall/landing area the chip board meets with a 7mm height difference. So the left room runs in to the hall and meets with the right side of the house with yes a 7mm height difference. Now I’m no builder but can tell it’s been thrown together. The customer wants us to uplift and relay the chipboard with new. But I’m dreding what I’m going to find that has caused the sub floor to be so out over a new build property. The builder has told the customer he is deeply offended by our accusations of a poorly fitted floor and told the customer that we can’t replace the chipboard as it’s tied in to the structure and that any good floor fitter would use bonding adhesive to fit his engineered floor. I’ve fitted floors for 20 years and I know that I can replace the chipboard and level the tops of the joists and lay the floor how the customer wants with a 5mm barrier foam underlay. But I’m concerned why the builder don’t want the floor lifted and what potentials is causing the chipboards to ramp up to the edges of the rooms and dive to the middles. Any help and advice would be greatly appreciated
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