What is the minimum trap diameter required for a laundry tub?

The minimum trap diameter required for a laundry tub is 38 mm. This size is stipulated in plumbing codes to ensure that the trap can effectively handle the volume of water and any solids that may be washed down the drain during laundry activities. A trap serves several critical purposes, including preventing sewer gases from entering the living space and trapping debris that could cause clogs in the plumbing system.

Having a trap diameter of 38 mm ensures sufficient flow capacity, which is particularly important given the higher amount of wastewater generated by a laundry tub compared to other fixtures. Smaller diameters may not adequately accommodate this flow, leading to increased risks of blockage and inefficiency in the drainage system. It's essential for plumbing installations, especially in residential settings, to follow these guidelines to maintain proper sanitation and proper functioning of the plumbing system.