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A42. Include a cross-section of the firewall for townhouses on "Zero" lot <br />lines. -IRC R302. <br />A43. Show minimum of 2 inch thick redwood planks for deck if deck joist <br />spacing is 16" on center or greater. Nominal 1" thick planking shall not be <br />used where deck joists are spaced greater than 12" on center. -IRC R502 <br />A44. Show exterior grade plywood or other approved exterior materials for <br />soffits. -IRC R703. <br />A45. Exterior siding shall comply with R703. Provide a detail on plans. <br />A46. Show 24 -inch on -center blocking for vertical siding. -IRC Table R703.4 <br />footnote J <br />A47. Provide an energy conservation analysis and the following information <br />on the plans R Values, U factors and solar heat gain coefficients, area <br />weighted U factor, mechanical system design, mechanical and service <br />water heating systems and equipment size and efficiencies, equipment <br />and system controls, duct sealing and piping insulation and air sealing <br />details. N1001.5 Show all "R" or "U" values on the drawings and which <br />performance path. <br />A48 Stair tread nosing: The radius of curvature at the leading edge of the <br />tread shall be no greater than 9/16 inch (914.3 mm). A nosing not less <br />than 3/4 inch (19 mm) but not more than 1 1/4 inches (32 mm) shall be <br />provided on stairways with solid risers. The greatest nosing projection <br />shall not exceed the smallest nosing projection by more than 3/8 inch (9.5 <br />mm) between two stories, including the nosing at the level of floors and <br />landings. Beveling of nosing shall not exceed 1/2 inch (12.7 mm). Risers <br />shall be vertical or sloped from the underside of the leading edge of the <br />tread above at an angle not more than 30 degrees (0.51 rad) from the <br />vertical. R311.7.5.3 <br />A. A nosing is not required where the tread depth is a minimum of 11 <br />inches (254 mm). <br />B. The opening between adjacent treads is not limited on stairs <br />with a total rise of 30 inches (762 mm) or less. Note: This means that <br />concrete stairs, without nosings, must have a tread depth of 11 inches. <br />A49. Show a minimum 4 -mil polyethylene vapor retarder over the insulation <br />on the inside (warm side) of all exterior walls and roof ceilings or which <br />system is going to be used. -IRC R702.7 <br />Page 10 of 21 <br />