Construction method and construction technology of waterproof membrane

1. Cold sticking

The construction method of using PVC matching adhesives to stick the coils to the base layer by cold work is called cold bonding method. According to different waterproof design requirements, cold bonding methods can be divided into full bonding or partial bonding methods.

(1) The full adhesion method is a construction method in which a PVC coil is bonded to a base layer.

1) During construction, first of all, pre-laying shall be carried out, and the PVC coils shall be naturally laid on the surface of the base line of the laying line (not adhered first). It is required to be flat and straight without distortion.

2) The longitudinal overlap width of the coil is 50mm, and appropriate cutting is performed. Butt treatment is adopted in the horizontal direction, and there is no composite layer (type N) with a width of 200 to 250 mm. PVC coil covering welding.

3) Fold the long side of one or more coils in half (about 10m), and apply special adhesive on the base layer and the surface of the coils respectively from the fold. Press and compact with a pressure roller. Then fold up the other unfolded parts, continue to operate from the folds as described above, and so on to stick and compact firmly. Perform butt welding.

(2) Locally stick the roll. When laying PVC coils, the coils and the base layer are pasted on the base layer by point or strip bonding.

Point sticking: point-like bonding between the coil and the base layer. There are not less than 5 points per square meter, and the area of ​​each point is 100mm × 100mm.

Sticky: The coil is bonded to the base layer in a strip. Each coil has at least two bonding surfaces with the base layer, and the width of each strip is not less than 150mm.

2. Empty paving

That is, when the PVC waterproof membrane is applied, the membrane and the base layer are bonded only within a certain width of the entire waterproof layer; the rest is not bonded.

The construction process of the empty paving method is as follows:

Grass-roots leveling, cleaning, elastic line, coil pre-laying, coil seam lap welding, special parts processing, fixing, blanking, sealing material sealing and acceptance. The pre-laying of the coil refers to the full adhesion method, and the longitudinal overlap width is 50mm. Secondly, only the surrounding materials of the entire waterproofing project are fully adhered, and the joints are welded. Buttwise treatment is adopted in the transverse direction, and the overlap and welding are covered with 200-250mm wide non-composite layer (N-type) PVC coil.