Hi! Good day! I'd like to ask lang if meron kang spreadsheet ng estimate sa ceiling..if possible gusto ko pong malaman commercial sizes ng mga ginamit nyong furring channel at paano nyo po inestimate nagamit nyong screws, rivet and other fasteners? Basic knowledge lang po alam sa Materials take off at madami pa. po akong, materials na di kilala. Hoping for immediate response on this matter. Thanks