HELPING THE OTHERS REALIZE THE ADVANTAGES OF ROOF DRAIN

Use wooden stakes and Mason’s line or chalk line to produce a sq. or rectangular form throughout the marked area. Ensure that the formwork is degree and safe. When making the formwork, make allowance for the slope in direction of the middle in the drain.จังหวัดประจวบคีรีขันธ์ (อำเภอทับà¸