What is the minimum flooding height of the waterproof layer at the deformation joint of parapet and roof?

Parapet is a technical term of architecture, also called cornice wall, which is a way to connect the roof with the external wall. As a measure to deal with the roof railing or building modeling, it can prevent people from falling and also play a role in waterproofing the roof.

The function of parapet is to protect personnel safety and decorate the building facade. The function of parapet is not only to decorate the facade, but also to fix linoleum or waterproof coiled material.

When there is a concrete coping, it should be calculated from the top surface of the floor to the bottom surface of the coping; When there is no concrete coping, the top surface of the floor slab to the top surface of the parapet shall prevail.

Extended data

The cracking of parapet is mainly caused by temperature deformation. The coping ring beam of parapet is generally low in longitudinal reinforcement, which can't control cracking. Therefore, driven by the shrinkage of coping, the cracking of the upper masonry of parapet tends to intensify.

The floor and ring beam are protected by thermal insulation layer, and the temperature difference changes little throughout the year, and the deformation of thermal expansion and contraction is relatively small, which can be regarded as a fixed chassis, which has a strong restrictive effect on the deformation of parapet. This restriction gradually weakens with the increase of parapet height.

The cracks on the top of the parapet are distributed in a certain way, and the width of the cracks varies with the spacing. When the spacing is 3 ~ 6m, the width of common cracks exceeds1mm. If the crack is filled with fine dust, soil or other water-soluble substances, the crack will never heal.

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