Below damp course and issues with utility area


Postby littleoldbloke » Sun Jul 16, 2017 11:30 am

Our utility area was built on side of house with doors front and rear. Approx 11 meters in length. Concrete floor with DPM. Floor height is 1.5 bricks below house damp proof course. Floor is sealed and painted. The house wall is also painted with masonry paint and below the DPC it needs re painting every 12 months or so. To protect the floor from wear and tear I laid interlocking plastic tiles and now every few months I find I have to lift a metre or so of tiles back from each door to dry up damp patches that are starting to go black. It is worse close to the house walls, so I suspect either it is the damp brickwork spreading under the tiles which are not sealed to the walls but being close to the doors and colder could this be condensation? All other areas of the floor are dry. I have tried the polythene test on the floor, Dry. Any advice or solution would be great. Thanks
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