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Working from below, drill several clearance/pilot/countersink holes through the subfloor and into the flooring.
With the cost of floor coverings over concrete subfloors now estimated at more than a billion dollars a year in the United States, far greater attention must be given to the issue of moisture within and below concrete slabs on grade.
We took away both the floor - the linoleum - and the subfloor - the concrete.
With vinyl flooring, it is vital that the subfloor underneath is free from debris and also has no divots or holes.
They edged too close to an open floor tile and the machine suddenly tipped at a sickening angle, then crashed through the opening to the subfloor below, pinning a workman's leg underneath.
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