What are the good materials for roof cracks? I am two people share a roof, the middle of the roof split wall cracks leak.
Asphalt can be divided into coal tar pitch, petroleum asphalt and natural asphalt three: Among them, coal tar pitch is a by-product of coking
Asphalt is a moisture-proof and anti-corrosion organic cementitious material, which consists of different molecular weight hydrocarbons and non-metallic derivatives of dark brown complex mixture, is a high viscosity organic liquid, was liquid, the surface was black , Soluble in carbon disulfide