| 摘要 |
The present invention relates to a damp-proofing of sandwich type comprising expanded PVC foil (1) in fixed coupling with plastic-covered tinsmith’s elements (7) wherein the sandwich type damp-proofing is provided with at least one cot (81; 82; 83; 84) of a coating material based on acrylate polymer aqueous dispersion, which optionally contains varnish. The number of coats (81; 82; 83; 84) depends on the state of the roof covering. The resulting thickness of one coat (81; 82; 83; 84) is in the range of 0.10 to 0.60 mm. The external, last surface coating (81; 82; 83; 84) reflects more than 90 percent of solar radiation. Surface density of the first coating material is 0.2 to 0.3 kg per 1 me2, that one of the second coating material is in the range of 0.2 to 0.4 kg per 1 me2, that one of the third or fourth coating material is in the range of 0.4 to 1.0 kg per 1 me2. An industrial fabric (9) with the thickness of the base warp grid in the range of 0.2 to 0.3 mm can be inserted in the second coating material (82). A non-woven industrial fabric (92) with the thickness in the range of 0.1 to 0.2 mm can be inserted in the first coating material. Application method of the above described sandwich type damp proofing is made all over the respective surface or locally on the surface of expanded PVC foil (1). Each additional coating material is applied either immediately to the preceding coating material or with the maximum dwell of 24 hours. The last, external coating material contains 1 to 20 percent by weight of at least one substance being selected from group consisting of silica, titanium oxide, zinc oxide and white limestone with particle size less than 0.1 mm, so that the external, last coat (81; 82; 83; 84) reflects more than 80 percent of solar radiation. |
