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one alarm will actuate ali the alarms in the individual unit and shall provide an alarm which will be audible in all sleeping areas. [Sec. 316.1] Smoke detectors shall be 110v with battery back- up. [Sec. 316.2] 15. DUPLEX FIREWALLS. Dwelling units in two-family dwellings shall be separated from each other by wall and/or floor assemblies of not less than l-hour fire. resistive rating. Fire-resistive rated floor-ceiling and wall assemblies shall extend to and be tight against the exterior wall'~ and wall assemblies shall extend to the underside of the roof sheathing. [Sec. 320.1] One acceptable wall construction would be a double row of staggered 2 x 4 studs @ 16-inch centers on 2 x 8 plates with R-15 insulation [for sound deadening] installed between 5/8- inch Type X gypsum wallboard on each wall face. 16. FIRESTOPPING shall be provided in the following locations: 1) In concealed spaces of stud walls, including furred spaces not to exceed 10 feet horizontally, and at the ceiling and floor level. 2) At all interconnections between concealed vertical and horizontal spaces such as occur at soffits, drop or cove ceilings, etc. 3) In concealed spaces between stair stringers at the top and bottom of the run and wall cavities in line with the stringers; 4) At openings around vents, pipes, ducts, chimneys and fireplaces at ceiling and floor level, with noncombustible materials. [Sec. 602.7] 17. WATER HEATERS shall be anchored or strapped to the building to resist horizonta[ displacement due to earthquake motion. [Sec. 510.5 Uniform Plumbing Code] HEATING AND COOLING appliances located in a garage shall be protected from impact by automobiles. Appliances that generate a glow, spark of flame capable of igniting gasoline vapors located in a garage shall be installed with burners, burner ignition devices or heating elements and switches at least 18 inches above the floor level. [Sec. 1307.3] DRYER VENTS. The maximum length of a 4-inch diameter exhaust vent shall not exceed 25- feet from the dryer location to wall or roof termination, and shall terminate with a full opening exhaust hood. A reduction in maximum length of 2.5-feet for each 45-degree bend and 5-feet for each g0 degree bend shall apply. Installations where this length limitation is exceeded shall be installed in accordance with the manufacturaFs instillation instructions. [Sec. 1801.3] 18. ENERGY PATH #1 is based on R-21 wall insulation, R-25 underfloor insulation, R-30 vaulted ceiling insulation, R-38 fiat ceiling insulation, R-21 basement wails, R-~I 5 slab floor edge insulation, R-8 forced air duct insulation, 0.40 U-value window class, 0.50 U-value skylight class, 0,54 U-value main entry door, (with a maximum area of 24 square feet) all other exterior doors, including the door between the heated dwelling and the unheated garage, 0.20 U-value. planrevu\97-04990.wps