Roofing waterproof practice

1, roofing method: cast-in-place roof slab-15 thickness 1: 3 cement mortar leveling layer-cold priming oil, three-felt and four-oil waterproof layer-mung bean sand protective layer.

2. Before the construction of roof waterproofing project, the grass-roots units should be inspected and cleaned, and the weak links should be reinforced first. The above waterproof layer can be constructed only after passing the inspection.

3. During the construction of roofing waterproof coiled material layer, the base course must be dry, otherwise it will affect the waterproof effect and dryness.

Inspection method: lay the 1m2 coil flat on the leveling layer, let it stand for 3-4 hours, and then open it for inspection. When there is no water mark on the leveling layer and the covering part of the coil, the coil can be laid. This paper mainly expounds the construction of waterproof coiled material.

4, waterproof coiled material before construction, should first prepare asphalt, according to the workload of the day, strictly measured with a scale.

5. Waterproof coiled material laying construction

The construction of coiled material waterproof layer should be carried out after the installation of masonry, equipment and pipes is completed. When paving high-low span houses, it should be carried out in the order of high before low, far before near.

In single-span pavement, the part with concentrated drainage (such as eaves gutter, cornice, inclined gutter, gutter, etc. ) should be laid first, according to the elevation from low to high, the coil of slope and elevation should be pasted from bottom to top, so that the coil overlaps along the direction of water flow.

When the coiled material is laid parallel to the roof, the long-side lap joint shall not be less than 70mm, the short-side lap joint shall not be less than 150 mm, and the lap joint of two adjacent coiled material short sides shall be staggered by not less than 500 mm. In order to ensure the lap width and straight laying of coiled material, the marking line shall pop up when the coiled material is laid.

On vaulted roofs and slopes under skylights with slopes exceeding 25%, short sides should be avoided as much as possible.

Before the coil is laid, the leveling layer should be dry. The general field test method is to cover the coil with 1-2h from night to the next morning or sunny day. If there is no condensation on the inside of the coil, it is considered that the leveling layer is basically dry.

Before the waterproof material enters the site, the supervision engineer should carefully check the factory certificate, quality guarantee and characteristics. , the technical indicators should meet the requirements; Ensure that the products must have the use certificate of the relevant state departments, and the certification materials are complete. Before use, random sampling method should be adopted for sampling and reinspection, and it can only be used after being approved by the supervision engineer.

The construction materials of roof waterproofing project are mainly asphalt waterproofing membrane modified by elastic body (SBS) and plastic body (APP) and polymer waterproofing membrane. In the construction site, it is often found that construction units and suppliers resort to deceit in the materials entering the site, confusing the fake with the real and shoddy.

When the main structure is accepted, the reserved holes in the roof panel, parapet and roof should be mainly inspected and tested. It is often inconvenient to get up and down the roof panels, which avoids the phenomenon that inspection management is not in place.

As a result, the surface of the roof slab is rough and cracked, the hole size is too large, and the masonry and maintenance of concrete structural columns and parapets are not in place. The supervision engineer should strengthen the control, issue a rectification notice to the supervision engineer for the content that does not meet the requirements of quality standards, and supervise the construction unit to hand over the division project.