Key to Code Check

Roofs & Ceilings

General Requirements
Eaves <3ft. from property line--1hr. construction . . . .[302.1] {T5-A}
Install per manu. specs, materials identified on packaging
...................................................................................[904.1,904.4] {1507}
Asphalt shingles min. slope--2:12 (double underlayment if =4:12)
...................................................................................[905.2.2] {T-15-B-1}
16in. Wood shingles min. slope--3:12 {3win. max. exposure if <4:12}
........................................................ . . . . . . . . . . . . . .[905.7.2] {T-15-B-2}
Wood shakes min. slope--3:12 {4:12} . . . . . . . . . [905.8.2] {T15-B-2}
Noncombustible or fire-retardant req'd . . . . . . . . . .[n/a] {1503, T15-A}
Clay/concrete tile min slope--22:12 [double underlayment if =4:12] {BUR if <3:12}...................................................................... . . . .[905.3.2] {T-15-D-1}
Flashing at roof/wall intersections, penetrations, chimneys, etc.[903.2] {1509}
Ice dam membrane min. 24in. {12in.} inside ext. wall line in cold climates
.................................................................................. .[905.2.7] {T-15-B1)
Chimney cricket req'd if >30in. wide . . . . . . . . . . .[1001.17] {n/a}
Trusses
Uplift >20 p.s.f. req's tie down to foundation . . . . . .[802.11] {1611.11.1}
No field modification, e.g., notching, cutting . . . . . .[802.10.4] {2320.1}
Provide design drawings, calculations & approvals w/shipment {marked on truss}.................................................................... . . . . . .[802.10.1] {2321.4}

Rafters & Ceiling Joists

Prefabricated wood I-joists per manu. spec. . . .F-b11 [802.7.2] {2320.1}
No notches on lower side {or middle 3rd} except at ends
......................................................................................... .[802.7.1] {2320.12.4}
Supports for <3:12 slope designed as beams not rafters .[802.3] {2320.12.1}
Rafter ties--1x4, 4ft. o.c. {if not // to rafters} . . . . .[802.3.1] {2320.12.6}
Ridge board min. 1" must be full depth of cut rafter . . . . . .[802.3] {2320.12.3}
Hip & valley rafters min. 2x material and full depth of cut rafter
...................................................................................... . .[802.3] {2320.12.3}
Purlin dimension no smaller than rafter . . . . . . . . . .[802.5.1] {2320.12.7}
Headers & trimmers =>4ft. must be doubled . . . . . . . .[802.9] {2320.12.5}
Header =>6ft. must be hung with hardware . . . . . . . . .[802.9] {2320.12.5}

Attics

Access IRC UBC
Attics >30in. high & [>30sq.ft.] require access--min. 22in.x30in. opening
..............................................................................................[807.1] {1505.1}

Ventilation
Vent each enclosed attic and rafter bay . . . . . . . . . . .[806.1] {1505.3}
Net area of openings min. 1/150th of vented area OR [806.2] {1505.3}
1/300th if 50-80% of venting near top OR vapor barrier [806.2] {1505.3}
Min. 1in. clearance of insulation to sheathing near vents [806.3] {1505.3}

Structural Sheathing/Bracing

Plywood--516in. min.@16in. o.c.; sin.@24in. o.c. . .[602.10.3] {2320.11.3-3}
Fiberboard--2in. min. for studs 16in. o.c. . . . . . .[602.10.3] {2320.11.3-4}
Gypsum board--nailed (not screwed) at 7 in. o.c. . . .[503.2.1] {2304.1}
Wood panels must have span rating on grade stamp [503.2.1] {2304.1}
Framing or blocking at all edges . . . . . . . . . . . . . .[602.10.7] {2315.5.3}
Nail to schedule (6in.-12in. min.) . . . . . . .T-b5 [T602.3(1&2)] {T-23-II-B-1}
Alternate methods OK if engineered & approved F-b12 [104.11] {104.2.8}

e b3 • Joist Spans, Notching & Bori