The contractor will be required to guarantee a wide range of high-quality sealing materials. Sealing material properties can be guaranteed.And the installation of the manufacturer's standard is no less than 10 years.
Guarantee employment must opt for high quality sealant. Can not guarantee that the sealant and installed according to the manufacturer's standards. Not less than 10 years
To guarantee the contractor must choose grout material of high quality. Can guarantee the properties of material grout and installation according to the standard of the manufacturer, no less than 10 years.