Answer:<\/p>\n\n\n\n
During the growth process, the roots secrete a substance called \u201croot acid\u201d; this organic acid not only corrodes highly alkaline cement and concrete, but also damages the bridge construction of the waterproof layer. In Japan, there are strict regulations for the types of plants planted on the waterproof layer (they must be grass or a small proportion of wood); domestically, ordinary homeowners and construction companies do not have this mindset, and they pass all the leakage problems on to the waterproof contractor. Therefore, waterproofing in the courtyard and tree holes must be paid special attention to and prevented\u2014as mentioned above. To prevent root acid from damaging the waterproof material, generally speaking, using water-resistant coatings such as FRP or EPOXY is a solution. However: FRP or EPOXY, these \u201csteel-like\u201d water-resistant materials are not suitable for use on courtyards or flower beds; therefore, the following countermeasures are recommended.
(1) If waterproof materials such as PU coating series are used, the structural surface must be coated with an additional layer of waterproofing to enhance the surface \"density\" of the material, preventing the penetration of root acids; after the waterproofing layer is applied, a layer of self-adhesive aluminum foil-faced rubber asphalt waterproof membrane or PVC membrane with a thickness of 1.5~2mm must be laid on top.
(2) If the baking method is used, it is best to choose modified asphalt waterproofing felt made from a high-hardness plastic series such as PE film with an additional layer of adhesive, PVC, or red mud rubber cloth. It is also best to install the felt in a two-layer construction\u2014first applying a 2mm thick pure modified asphalt waterproofing felt, then laying a second 2mm thick layer, with the top layer also being covered with a modified asphalt waterproofing felt made from a high-hardness plastic.
(3) Using a composite method\u2014first applying a series of coating materials for waterproofing (such as the tar-based PU or epoxy-based bitumen), then applying a series of thin-sheet materials such as self-adhesive EPDM, EVA, and PVC on top of them.
(4) If the budget allows, high-speed spray coating of Grout or manual application of polyurethane (which should already have acid and alkali resistance properties).<\/p>","protected":false},"excerpt":{"rendered":"
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