PART III – BUILDING PLANNING AND CONSTRUCTION

CHAPTER 3
BUILDING PLANNING

SECTION R301 DESIGN CRITERIA

Table R301.2(1) is revised to include the climatic and geographic design criteria for Philadelphia as follows:

TABLE R-R301.2(1)
CLIMATIC AND GEOGRAPHIC DESIGN CRITERIA

 

GROUND SNOW LOAD	WIND SPEED d (mph)	SEISMIC DESIGN CATEGORY f	SUBJECT TO DAMAGE FROM			WINTER DESIGN TEMP e	ICE BARRIER UNDER- LAYMENT REQUIRED h	FLOOD HAZARDS g	AIR FREEZING INDEX i	MEAN ANNUAL TEMP j
			Weathering a	Frost line depth b	Termite c
25 psf	115	B	Severe	30 in.	Moderate to heavy	14° F	YES	(a) 1979 (b) 11/18/15 (c) see table R-R301.2(1a)	500	55.9° F

 

Insert Table R-R301.2(1a) as follows

TABLE R-R301.2(1a)
PANEL NUMBERS AND DATES OF EFFECTIVE FIRMs FOR PHILADELPHIA

PANEL NUMBER	EFFECTIVE
420757IND0B	11/18/2015
4207570019G	01/17/2007
4207570038G	01/17/2007
4207570067G	01/17/2007
4207570078G	01/17/2007
4207570086G	01/17/2007
4207570087G	01/17/2007
4207570088G	01/17/2007
4207570089G	01/17/2007
4207570104G	01/17/2007
4207570107G	01/17/2007
4207570108G	01/17/2007
4207570109G	01/17/2007
4207570111G	01/17/2007
4207570113G	01/17/2007
4207570114H	11/18/2015
4207570116G	01/17/2007
4207570117H	11/18/2015
4207570118H	11/18/2015
4207570119H	11/18/2015
4207570126G	01/17/2007
4207570127G	01/17/2007
4207570128G	01/17/2007
4207570129G	01/17/2007
4207570136H	11/18/2015
4207570157G	01/17/2007
4207570159G	01/17/2007
4207570167G	01/17/2007
4207570169H	11/18/2015
4207570177G	01/17/2007
4207570178G	01/17/2007
4207570179G	01/17/2007
4207570181G	01/17/2007
4207570182H	11/18/2015
4207570183G	01/17/2007
4207570184H	11/18/2015
4207570186H	11/18/2015
4207570187H	11/18/2015
4207570188H	11/18/2015
4207570189H	11/18/2015
4207570191H	11/18/2015
4207570192H	11/18/2015
4207570193H	11/18/2015
4207570194H	11/18/2015
4207570201H	11/18/2015
4207570202H	11/18/2015
4207570203H	11/18/2015
4207570206H	11/18/2015
4207570230H	11/18/2015

 

SECTION R302 FIRE-RESISTANT CONSTRUCTION

Pursuant to the UCC, delete Section R302.5.1 and replace as follows:

   R-R302.5.1 Opening protection. Openings from a private garage directly into a room used for sleeping purposes shall not be permitted. Other openings between the garage and residence shall be equipped with solid wood doors not less than 1-3/8 inches (35 mm) in thickness, solid or honeycomb core steel doors not less than 1-3/8 inches (35 mm) thick, or 20-minute fire-rated doors.

SECTION R310 EMERGENCY ESCAPE AND RESCUE OPENINGS

Delete Section R310.6 and replace as follows:

R-R310.6 Alterations or repairs of existing basements. An emergency escape and rescue opening is not required for existing basements undergoing alterations or repairs, where such alterations or repairs do not increase the existing story height of the basement.

Exception: New sleeping rooms created in an existing basement shall be provided with emergency escape and rescue openings in accordance with Section R310.1.

SECTION R311 MEANS OF EGRESS

Pursuant to the UCC, delete Section R311.7.4 and replace as follows:

   R-R311.7.4 Walkline. The walkline across winder treads and landings shall be concentric to the turn and parallel to the direction of travel entering and exiting the turn. The walkline shall be located 12 inches (305 mm) from the inside of the turn. The 12-inch (305 mm) dimension shall be measured from the widest point of the clear stair width at the walking surface. Where winders are adjacent within a flight, the point of the widest clear stair width of the adjacent winders shall be used.

Figure R311.7.4
Winder Tread and Landing Detail

Pursuant to the UCC, delete Section R311.7.5 and replace as follows:

   R-R311.7.5 Stair treads and risers. Stair treads and risers shall meet the requirements of this section. For the purposes of this section, dimensions and dimensioned surfaces shall be exclusive of carpets, rugs or runners.

      R-R311.7.5.1 Risers. The riser height shall be not more than 8-1/4 inches (210 mm). The riser shall be measured vertically between leading edges of the adjacent treads. The greatest riser height within any flight of stairs shall not exceed the smallest by more than 3/8 inch (9.5 mm). Risers shall be vertical or sloped from the underside of the nosing of the tread above at an angle not more than 30 degrees (0.51 rad) from the vertical. Open risers are permitted provided that the openings located more than 30 inches (762 mm), as measured vertically, to the floor or grade below do not permit the passage of a 4-inch diameter (102 mm) sphere.

      Exceptions:

         1.   The opening between adjacent treads is not limited on spiral stairways.

         2.   The riser height of spiral stairways shall be in accordance with Section R311.7.10.1.

      R-R311.7.5.2 Treads. The tread depth shall be not less than 9 inches (229 mm). The tread depth shall be measured from tread nosing to tread nosing. The greatest tread depth within any flight of stairs shall not exceed the smallest by more than 3/8 inch (9.5 mm). Treads may have a uniform projection of not more than 1-1/2 inches (38 mm) when solid risers are used.

         R-R311.7.5.2.1 Winder Treads. Winder treads shall have a tread depth of not less than 10 inches (254 mm) measured between the vertical planes of the foremost projection of adjacent treads at the intersections with the walkline. Winder treads shall have a tread depth of not less than 6 inches (152 mm) at any point within the clear width of the stair. Within any flight of stairs, the largest winder tread depth at the walkline shall not exceed the smallest winder tread by more than 3/8 inch (9.5 mm). Consistently shaped winders at the walkline shall be allowed within the same flight of stairs as rectangular treads and shall not be required to be within 3/8 inch (9.5 mm) of the rectangular tread depth.

         Exception: The tread depth at spiral stairways shall be in accordance with Section R311.7.10.1.