Weatherability metal roofing waterproof coating

Construction process JG / T 375-2012 Metal Roof Acrylic High elastic Waterproof Coating

I Construction steps:

Base course treatment → Details treatment → Large area waterproof construction

II Base treatment

①. During construction, the working surface shall be carefully cleaned first, and the foundation surface fasteners must be kept clean without looseness, corrosion, oil, dust and water.

②. Loose fasteners on the roof must be replaced or reinforced.

③. If the base surface is obviously rusted, it needs to be polished.

④. The parts with oil, dust and water on the base surface need to be cleaned.

⑤. Determine the parts to be treated with polyester cloth and their width, and cut the polyester cloth of corresponding width.

III Construction technology

High pressure airless spraying, coating or brushing construction shall be adopted.

1. Details processing

In general, the joints of all horizontal and vertical surfaces on the roof shall be subject to detailed treatment, such as expansion joints, the base of vents, drainage pipes and other fixed parts of protruding buildings and their ancillary equipment. In the way of "one fabric with three coatings", the reinforced polyester fabric is embedded into the coating for reinforcement. Where treatment is required, apply sufficient paint, and cut the reinforced polyester fabric into appropriate size and shape according to the size of the area. Lay flat on the paint that has not been dried. Press the reinforced polyester fabric into the coating with a brush or roller, eliminate air bubbles and wrinkles, and then brush it again with sufficient coating to completely immerse the reinforced polyester fabric.

The specific treatment methods are as follows:

①. Roof lap joint: apply a coat of paint, lay 15-20cm wide polyester fabric on the lap joint, and then fully soak it with paint to ensure no blistering and wrinkling.

②. Bulge: the chimney, air outlet, fan port and other parts need to be painted around, and then the polyester fabric with matching size and shape is laid, and the polyester fabric is fully soaked with a layer of paint to ensure no blistering and wrinkling.

③. Firmware: square polyester fabric with appropriate specification and size shall be prepared, and the specific method is the same as that of "raised part".

④. Gutter: local waterproof treatment shall be carried out at the lap joint and water outlet of gutter, and the specific method is the same as that of "Bulge".

2. Large area waterproof layer construction

The waterproof coating film shall be coated in two times. The second time construction shall be carried out after the first drying. The coating time interval is generally 12h. It should be extended in winter. The coating thickness of each time should be 0.5mm, not too thick. The brushing direction is perpendicular to each other, and the brushing is uniform without omission.

Packaging and storage

Packed in plastic barrels with a net weight of 3kg/barrel; 20kg/barrel under normal storage and transportation conditions, the storage period is 12 months