1. The roof hatch is mainly used to discharge the water vapor under the thermal insulation roof. If the insulation layer and the leveling layer are not dry enough or difficult to dry, the exhaust holes should be left when laying the coil, so that the moisture under the coil layer can be discharged. This roofing method is called exhaust roof. If no vent holes are left, the moisture of the base layer will be sealed under the waterproof layer of the membrane. Once the temperature is high (especially in hot summer), the moisture will evaporate and the volume will expand, and the membrane will bulge, causing the waterproof layer of the membrane. Cracks and damages in the water layer, resulting in water leakage from the roof.

2. In the past, thermal insulation materials were mainly inorganic materials such as cement perlite. Water must be used during mixing. When it rains, the water in the thermal insulation layer cannot be drained out in a short time. There is moisture in the thermal insulation layer, and the waterproof layer is It will bulge, and the thermal insulation performance will decrease, so the moisture in the thermal insulation layer should be discharged, and the steam exhaust channel and the steam exhaust hole should be set up.

In principle, if the humidity in the insulation layer is balanced with the atmosphere, the exhaust system is not necessary, and it can be sealed off, and it is more reasonable to seal it than to keep it. Pay attention to the waterproofing when sealing.

Some people think that the vent hole is set up to prevent rainwater from entering the insulation layer. If the rainwater keeps entering the insulation layer, it means that the waterproof layer has been damaged and the roof should leak water. The exhaust system is not enough and unreasonable. Therefore, you can seal the hole according to the situation of the roof.

Whether the insulation layer can enter water without affecting the insulation performance depends on the insulation material and process. If the thermal insulation material itself does not absorb water, and there may be a water inlet gap between the thermal insulation boards, the thermal insulation layer and the underlying waterproof layer, it is also necessary to pay attention to frost heaving in winter, which will damage the thermal insulation layer and the floor tile surface above.

3. The roof exhaust system belongs to the technical field of roof moisture-proof exhaust. The roof is composed of a reinforced concrete structure layer, a thermal insulation layer, a leveling layer, a waterproof layer and a protective layer in sequence. A waterproof layer and an additional waterproof layer are arranged in close contact with the outer wall of the extended exhaust pipe. In the above-mentioned roof exhaust system, vertical and horizontal exhaust passages are arranged in the insulation layer, and the exhaust passages are connected with an exhaust pipe extending out of the roof, so that the gas in the insulation layer can be discharged in time, effectively preventing the roof from frost heave due to water. , The pressure of the gas leads to the cracking and damage of the roof, which prolongs the service life of the roof. And the construction is convenient and the production cost is low.