Construction of Roof Drainage Board - HDPE Geomembrane, PP ...
It is ideal to lay 3-5 cm yellow sand on geotextiles. This is conducive to the filtration of geotextiles. If the backfill is a nutritive soil or light soil, there is no need to lay a layer of yellow sand. The soil itself is very loose and easy to drain. 8. When the drainage board is laid, the next 1-2 fulcrums are laid on the side and right. Two boards can also collide. The top is lapped with geotextiles.
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