We have a maple strip floor fixed to 18mm marine ply which in turn is fixed to a concrete base. 4 years ago the floor in one corner by a patio window lifted over an area of of about 1 sq metre by approx 5 mm. We had the insurers out to investigate, took the patch of floor up in question and there conclusion was it was a damp proof failure and was not convered. They left it for us to fix. There was no sign of damp on the wall albeit it did appear colder in that area than the remainder of the wall. We took some advice from the flooring company that laid the floor suggesting we look at taking out any moisture in the room with a de-humidifier over a week, and then apply a basic dpm sealant to the affected and re-lay the patch of floor, which appeared to do the trick. Problem is back with same patch of floor affected and lifted.
We've checked the cavity for any sign of water/damp or failure of DPM and it's clean and dry. On the outside we have an Inspection chamber where drain runs parallel to the wall in question which looks fine but we have noticed that there is a certain amount of damp on the brickwork under the level of the DPM. Garden lawn is separated from the affected area by a 1m wide path, and wondering that with the amount of rain we've had in lancashire over the last 2 years as to whether water isn't draining and maybe draining under path into substrate under concrete slab (?). In addition, water main also runs parallel to both the external wall and then takes a 90' bend along the length of the patio window before coming up into the adjacent kitchen.
Do we get someone to assess the state of the drain with a camera or is it possible that the floor could be suffering from sulphate corrosion (house was built 1957 and most probable that the concrete slab was laid on fly-ash/cinders) and go back to the Insurer for another review? Any suggestions gratefully received.
We've checked the cavity for any sign of water/damp or failure of DPM and it's clean and dry. On the outside we have an Inspection chamber where drain runs parallel to the wall in question which looks fine but we have noticed that there is a certain amount of damp on the brickwork under the level of the DPM. Garden lawn is separated from the affected area by a 1m wide path, and wondering that with the amount of rain we've had in lancashire over the last 2 years as to whether water isn't draining and maybe draining under path into substrate under concrete slab (?). In addition, water main also runs parallel to both the external wall and then takes a 90' bend along the length of the patio window before coming up into the adjacent kitchen.
Do we get someone to assess the state of the drain with a camera or is it possible that the floor could be suffering from sulphate corrosion (house was built 1957 and most probable that the concrete slab was laid on fly-ash/cinders) and go back to the Insurer for another review? Any suggestions gratefully received.
