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You can start by giving the wall a moisture-proof treatment.
Method: Before paving the black mirror, that is, when the wall is concrete, spray the ground with special moisture-proof liquid, and you can do it. Spray twice, with an interval of one hour in between. After four or five days, you start the construction that you originally planned.
The effect of this is to prevent moisture, block the moisture and moisture on the side of the wall, and the moisture will not pass, which can solve the problem of your black mirror falling off.
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The wall is brushed with waterproof paint, reinforced with stainless steel on the black mirror edge, and the back can be reinforced with fireproof plywood.
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Why use black mirror, it is impossible not to be damp for a long time, you can also use mosaic to try it, the effect is also good.
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Glue paste, fixed all around with frame moldings and air nail wall jet air nails.
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