1. Inverted roof is waterproof
Advantages: in the inverted roof, because the waterproof layer under the insulation layer protection, the roof waterproof layer and structure layer annual temperature difference, daily temperature difference is very small, almost in relatively constant temperature environment, the waterproof structure, not only can improve the waterproof layer to base expansion or cracking deformation adaptability, slowing down the environmental damage to the waterproof layer, conducive to extend the service life of the waterproof layer, and can reduce the waiting for grassroots dry time, is conducive to speed up the construction progress and shorten the construction period.

Disadvantages: but with the growth of use time, the protective layer due to natural and artificial factors will inevitably appear cracks, resulting in water seepage.This moisture is deposited in the gap between the insulation and waterproof layers with no way out but natural evaporation.If the following waterproof layer produces cracks due to uneven building settlement and other reasons, the water will leak into the room.
2. The upright roof is waterproof
Disadvantages: the vast majority of the flexible waterproof layer is organic materials, long-term exposed to the natural environment, easy to aging; the insulation layer can not always maintain the natural air dry state for a long time, once the waterproof layer is damaged, the infiltrated moisture is absorbed by the insulation material will have nowhere to escape, the water vaporized under the sun exposure, make the waterproof layer bubble drum, accelerate the damage of the waterproof layer.