Low Income Housing Tax Credits & Water & Energy Efficiency in Maine, 2018

MaineHousing's 2018 Qualified Allocation Plan (QAP) references its Quality Standards and Procedures Manual (June 2016), which includes requirements for water and energy efficiency.

Division 15, Mechanical Systems

  1. MAIN WATER SUPPLY SHUTOFF shall be provided for each building.
  2. DOMESTIC ABOVE GRADE WATER SUPPLY PIPING shall be Type "L" copper or Chlorinated Poly Vinyl Chloride (CPVC) tubing or cross-linked polyethylene (PEX) tubing which is designed, specified, and be installed per the mechanical design professional’s requirements for the systems provided.
  3. ABOVE GRADE HEAT SYSTEM PIPING shall be type “L” copper, steel, or crosslinked polyethylene (PEX) tubing designed, specified, and be installed per the design professional’s requirements for the systems provided.
  4. “POWER VENTS” FOR COMBUSTION EXHAUST ON HEATING APPLIANCES are prohibited. 18
  5. COMBUSTION AND VENTILATION AIR is required in all mechanical rooms housing fuel burning appliances that require combustion air or produce residual heat as part of their function. All such systems shall be designed by design professionals.
  6. TANKLESS COILS FOR DHW GENERATION are discouraged. If proposed, they shall be sized to produce adequate DHW for 125% of the projected worst-case unit needs.
  7. DOMESTIC HOT WATER DELIVERY shall be set to prevent scalding at all fixtures.
  8. FLOOR DRAINS AND/OR SUMP HOLES shall be provided in all basements. The floor should be pitched to these drains or sumps and these should be connected to a positive drainage system, or to the exterior of the building. Connections to storm water systems should be equipped with backflow preventers.
  9. PLUMBING VALVES AND TRAPS shall be located so as to be accessible. Access panels shall be constructed in accordance with the Maine State Plumbing Code and be properly fire rated should they be installed in fire rated assemblies.
  10. WATER HEATER DRAINS FROM PRESSURE-TEMPERATURE RELIEF VALVES shall not discharge on living unit floors. Pressure-temperature relief valve piping shall be securely mounted.
  11. DOMESTIC WATER AND/OR HEAT PIPING shall not be run in unheated attic spaces, outside wall cavities, unheated crawl spaces or any other areas subject to freezing temperatures.
  12. HEAT AND DOMESTIC HOT AND COLD-WATER SUPPLY PIPING shall be properly insulated to both prevent heat loss to surrounding spaces and loss of energy within the piping systems.
  13. MECHANICAL SUBCONTRACTOR shall be responsible for maintaining the entire heating system in good working order for at least one year from the date of substantial completion of the entire project.
  14. EXISTING FIXTURES and/or devices containing mercury shall be removed and properly disposed of.
  15. THE INSTALLATION OF ANY PRESSURIZED PIPING including domestic hot and cold water and heat piping of any materials beneath slab on grade construction is strongly discouraged.
  16. DUCTWORK FOR HEATING, VENTILATING, AND AIR-CONDITIONING SYSTEMS AND INCLUDING VENTING FOR CLOTHES DRYERS, BATHROOM EXHAUSTS, AND KITCHEN RANGE HOODS shall be smooth surfaced metallic type and be hard-cast sealed at all joints.
  17. PLUMBING AND/OR MECHANICAL COMPONENTS penetrating into building thermal envelope components shall be properly air-sealed.
  18. BATHROOM EXHAUST FANS when provided shall be low noise with energy efficient fan motor rated for continuous duty with a minimum rating of 50 cfm unless engineered otherwise.
  19. LOW FLOW FAUCETS, SHOWERHEADS AND TOILETS shall be provided to reduce water consumption as follows:
    1. FAUCETS: Flow rate of no more than 1 gallon per minute (GPM)
    2. SHOWERHEADS: Flow rate of no more than 2 gallons per minute (GPM)
    3. TOILETS: Rated at 1.6 gallons per flush (GPF) or less OR dual flush
    4. URINALS: Rated at 1.0 GPF or waterless
    5. HEATING SYSTEM shall be safe, quiet, and economical in operation and complete in all respects. This system shall provide a uniform temperature of 70 degrees F. (75 degrees F for elderly) in all living spaces as may be noted on the drawings, when the outside temperature is the appropriate outdoor design temperature for each development location which shall be specified in accordance with the ASHRAE 99% scale.
    6. WHOLE-BUILDING VENTILATION where whole-building ventilation is proposed, such systems shall be professionally designed and shall include provisions for make-up air, heat recovery, kitchen, and bathroom exhaust, at a minimum. It is important that the expected operational costs of such systems be included in the Owner’s project budget.
Contributed By: 
National Housing Trust

Other Items of Interest