Construction asphalt felt paper is a building material made from animal hair or plant fibers, which is soaked in asphalt and made from felt or thick paper blanks. It has the characteristics of impermeability and toughness, and is usually used as a waterproof and moisture-proof layer for roofs, foundations, basement walls, etc. Oil felt paper is also a general term for asphalt waterproofing membranes, which can be made into various types and specifications of products according to different materials and processes.

The leakage of asphalt glass cloth and felt mainly occurs at the through wall pipe, bolt, deformation joint, and roll joint. These special areas have poor waterproof base treatment, loose structure, and loose leveling layer closure; The edge of the additional layer of the coil is not tightly closed, and the cutting of the coil is irregular; Poor twisting and compression of the deformation joint waterproof strip, structural deformation, and other reasons cause water leakage at the deformation joint; The joint rolls constructed successively at the joint of asphalt glass cloth and asphalt felt have been damaged, and the adhesion is not tight, resulting in water leakage. During construction, standardized treatment methods should be adopted according to different special parts. During operation, the roll material should be carefully cut according to its shape, and the edges should be flattened and tightly bonded. After completing the additional layer paving in these parts, careful inspection should be carried out to ensure strict acceptance.