HIGHLIGHTS OF 248 CMR AS IT APPLIES TO THE USE OF PVC IN MASSACHUSETTS

• Not for use in buildings over ten (10) stories in height regardless of occupancy.
• Number of stories: Reference 780 CMR.
• In a mixed use occupancy, PVC may be installed in residential portions only. The non-residential portion of the system, as defined in 780 CMR, must remain under commercial application.
• Schedule 40 is not allowed for use on commercial urinal waste at present.
• When using PVC for waste in beauty parlors, barber shops, photo labs, soda fountains, bar sinks, indirect wastes from dialysis equipment, PVC is allowed from the point of dilution to a point 6" above the flood level rim of the fixture being served.
• PVC and ABS cannot be solvent-welded to each other.
• Expansion joints are required between every other branch interval and on horizontal runs exceeding 20' (feet). Offsets do not eliminate the need for this requirement.
• PVC shall be sleeved when passing through concrete slabs or walls.
• Fire-stopping shall be in compliance with 780 CMR.