The reason why the TPO material on the surface of Himei waterproof tiles will not penetrate after welding is due to its unique structure and welding process. The seams of the TPO film are heated and pressed by hot air or mechanical equipment to form a sealed connection, thereby preventing moisture from penetrating. TPO itself has good weather resistance and waterproof performance, and the joints formed after welding are strong and sealed, effectively preventing moisture penetration and protecting the building structure from water damage.