(a) If you use unitary materials, they must be installed and maintained according to manufacturer's specifications.
(b) Unitary materials may be installed over concrete or asphalt, only if recommended by the manufacturer.

Source Note: The provisions of this §747.4709 adopted to be effective September 1, 2003, 28 TexReg 1462; transferred effective March 9, 2018, as published in the Texas Register February 16, 2018, 43 TexReg 909