Plastic modified asphalt waterproofing membrane (APP) is a sheet waterproof material that can be rolled up by impregnating and coating with modified asphalt such as random polypropylene (APP) or polyolefin polymers (APAO, APO), using high-quality polyester felt, fiberglass felt, composite tire cloth as the base, and covering the surface with isolation materials such as polyethylene film, fine sand, mineral flakes (particles), etc.

Product specifications

• According to different tire bases, it is divided into polyester tire (PY), fiberglass (G), and fiberglass reinforced polyester felt (PYG);​
• According to the surface isolation materials, they are divided into polyethylene film (PE), fine sand (S), and mineral granules (M). The lower surface isolation material is fine sand (S) and polyethylene film (PE).
• Divided into Type I and Type II based on physical and mechanical properties.

Product Performance

• It can form a high-strength waterproof layer with strong resistance to pressure and waterproof ability.
• High tensile strength, high elongation, strong self-healing ability, and strong adaptability to base shrinkage deformation and cracking.
• Excellent high and low temperature resistance, large temperature difference resistance, suitable for both hot and cold regions, especially for cold regions.
• High strength polyester tire has high strength, resistance to puncture, abrasion, tearing, and fatigue.
• Good corrosion resistance, mold resistance, aging resistance, UV resistance, and weather resistance.
• Good construction performance, hot melt bonding can be applied all year round, and the hot joints are reliable and durable.

Construction method

Hot melt method, cold bonding method, and cold hot bonding method

• The roll material can be constructed separately using hot melt method or cold bonding method, or it can be constructed using a combination of hot and cold methods, that is, using cold bonding method for a large area, and using hot melt method for the construction of the lap joint.
• Hot melt method: Use a flame gun or spray lamp to bake the bottom and base surface of the roll material, melting the asphalt on the surface of the roll material. While baking, roll the roll material forward, and then use a pressure roller to press it firmly to the base or roll material.
• Cold bonding method: First, evenly apply the adhesive on the waterproof base layer and the roll material. After a little cooling, the roll material can be bonded. Then, use a pressure roller to roll and squeeze out the air underneath the roll material, making it flat, tight, and firmly attached to the base layer or roll material.

Construction equipment and auxiliary materials

• Construction tools such as shovel, broom, dust blower, hammer and steel chisel for cleaning waterproof base course. The construction tools for laying rolls include scissors, tape measure, wire box, scraper, brush, and pressure roller.
• Specialized hot melt equipment: single or multi head hot melt spray gun or spray lamp.
• Laying materials: base treatment agent, roll adhesive, and sealing strip roll material laying.

Roll laying

• ​Before construction, the base layer that has passed the acceptance inspection should be cleaned up, and the dust at the edges and corners should be blown clean.
• The application of base treatment agent should be uniform and consistent. Do not apply repeatedly.
• After the grassroots treatment agent is dried, the roof waterproofing project and the underground waterproofing project that require additional layers should be laid with additional layers according to the design requirements.
• Determine the sequence and direction of laying the roll material and mark the line on the base layer, then lay the roll material. The pasting of different parts of the roll material should be carried out according to the following requirements.
• Roofing: Roll and base point pasting or strip pasting: The 800mm surrounding the roof should be fully pasted, and the sloping roof pasting area should be more than 70%. The roll and roll should be 100% fully pasted.
• Basement floor: The roll material can be fully bonded, point bonded, strip bonded, or laid empty to the base layer, but the roll material must be fully bonded to each other.
• Basement vertical wall: The rolls should be fully adhered to the base layer and between rolls.
• Additional layer: The general area is fully pasted, and empty paving is allowed at the deformation joint.
• The laying sequence is high first, then low span; At the same height, go far first and then come close; Lay on the same plane starting from the lower part.
• Roof laying direction: Lay parallel to the ridge direction with a slope of less than 3%.
• Lay parallel or perpendicular to the ridge direction with a slope of 3%~15%.
• When the slope is greater than 15% or subjected to vibration, it is advisable to lay it perpendicular to the ridge direction.
• Parallel to the ridge, the joint should be laid in the direction of the flowing water, and perpendicular to the roof ridge, the joint should be laid in the direction of the dominant wind direction.

Main physical and mechanical properties

Elastic modified asphalt waterproofing membrane complies with GB18242-2008 standard