It should be a polyethylene foam film a level of medicine, has the very big difference with the ordinary plastic film.What is the white mat?Suggest that you accept the moisture film provided by businesses. Especially in the geothermal environment, not only moisture, but also environmental protection, but also good thermal conductivity.
The original mats at the seams overlap 20mm, and tape sealing, although also can achieve similar waterproof effect, but the cushion thickness of 2mm or so, the overlap will have high low, easy to produce noise floor installation. The thickness of plastic film is only about 0.1mm, although the overlap will not produce high and low, no effect on the pavement.
Wood flooring, acceptance and use of standard requirements, in the mat below paving a layer of plastic film, seam overlapping 20mm, and tape seal, in the geothermal conditions, even if the tape is moisture degumming, it is difficult to influence the floor, can more effectively prevent the harm of moisture on the floor. Therefore, it is necessary to lay plastic film in the geothermal environment.