Code Keying is a copyright of Dennis Davey 1989.

Code Keying integrates specific sections of Building Codes with elements on our construction drawings. The code reference number, for example, (310.2.1) will appear on our construction drawing next to a dimension or element, such as an egress window. You can visit this page on our web site to read the code reference applicable to the condition shown on our construction drawings.

Code Keying from CABO-One and Two Family Dwelling Code 1995 Edition

308.4 Hazardous locations. The following shall be considered specific hazardous locations for the purpose of glazing.

1. Glazing in ingress and means of egress doors except jalousies.

2. Glazing in fixed and sliding panels of sliding (patio) door assemblies and panels in swinging doors.

3. Glazing in storm doors.

4. Glazing in all unframed swinging doors.

5. Glazing in doors and enclosures for hot tubs, whirlpools, saunas, steam rooms, bathtubs and showers. Glazing in any part of a building wall enclosing these compartments where the bottom edge of the glazing is less than 60 inches (11524mm) above the drain inlet.

6. Glazing, in an individual fixed or operable panel adjacent to a door where the nearest vertical edge is within a 24-inch (610mm) arch of the door in a closed position and whose bottom edge is less than 60 inches (1524mm) above the floor or walking surface.

7. Glazing in an individual fixed or operable panel, other than those locations described in Items 5 and 6 above, that meets all of the following condition:

7.1 Exposed area of an individual pane greater than 9 square feet (0.836 m sq)

7.2 Bottom edge less than 18 (457mm) above the floor.

7.3 Top edge greater than 36 inches (914mm) above the floor.

7.4 One or more walking surfaces within 36 inches (914mm) horizontally of the glazing.

8. All glazing in railing regardless of an area or height above a walking surface. Included are structural baluster panels and nonstructural in-fill panels.

9. Glazing in walls and fences enclosing indoor and outdoor swimming pools where the bottom edge of the pool side is (1) less than 60 inches (1524mm) above the walking surface and (2) within 36 inches (914mm) horizontally off a walking surface. This shall apply to single glazing and all panes in multiple glazing.

309.1 Opening Protection. (Connecticut Supplement) 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 either a solid wood door not less than 1.3/4 inch (35mm) solid wood door, 1 3/4 inch solid or honeycomb core steel door or 20-minute fire-rated doors. Doors shall be fitted with a self-closing device.

309.2 Separation required. (Connecticut Supplement) Garages attached side by side to residences shall be separated from the residence and its attic area by means of a minimum 5/8 inch type X gypsum board applied to the garage side. Garages beneath habitable rooms in residences shall be separated from adjacent interior spaces by a minimum 5/8 inch type X gypsum board on the garage side of all walls, ceilings and combustible structural supports. Gypsum board joints shall be finished in accordance with the manufacturer's requirements.

309.3 Floor Surface. Garage and carport floor surfaces shall be of approved noncombustible material. That area of floor used for parking of automobiles or other vehicles shall be sloped to facilitate the movement of liquids to a drain or toward the main vehicle entry doorway.

310.2.1 Minimum Size. All egress or rescue windows from sleeping rooms must have a net clear opening of 5.7 square feet. The minimum net clear opening height shall be 24 inches. The minimum net clear opening width shall be 20 inches. Exception: Grade floor windows may have a minimum net clear opening or 5 square feet. (CT supplement)

311.1 General. The required exit door shall be a side-hinged door not less than 3 feet (914mm) in width and 6 feet 8 inches (2032) in height. Other exterior hinged or sliding doors shall not be required to comply with these minimum dimensions. The minimum width of a hallway or exit access shall be not less than 3 feet (914mm).

312.1 General. A minimum of 3 foot by 3 foot (914 mm by 914 mm) landing shall be required on each side of an egress door. The floor or landing shall no be more than 1.1/2" (38 mm) lower than the top of the threshold.

Exceptions:

1. At the top of stairs, provided the door does not swing over the stair.

2.The landing at the exterior doorway shall not be more than 8.1/4 inches (210 mm) below the top of the threshold, provided the door does not swing over the landing.

3.Exterior storm and screen doors are not exempt from the requirements for landings.

314.2 Treads and risers. (Connecticut Supplement) The maximum riser height shall be 8.1/4" inches and minimum tread depth shall be 9 inches. The rise height shall be measured vertically between leading edges of the adjacent treads. The tread depth shall be measured horizontally between the vertical planes of the foremost projection of adjacent treads and at a right angle to the tread's leading edge. The walking surface of treads and landings of a stairway shall be sloped no steeper than one unit vertical in 48 units horizontal (2 percent slope). the greatest riser height within any flight of stairs shall not exceed the smallest by more than 3/8" The greatest tread depth within any flight of stairs shall not exceed the smallest by more than 3/8".

315.1 Handrails. Handrails having minimum and maximum heights of 30 inches and 38 inches (762 mm and 965 mm), respectively, measured vertically from the nosing of the treads, shall be provided on at least one side of stairways of three or more risers. Spiral stairways shall have the required handrail located on the outside radius. All required handrails shall be continuous the full length of the stairs. Ends shall be returned or shall terminate in newel posts or safety terminals. Handrails adjacent to a wall shall have a space of not less than 1.1/2" inches (38 mm) between the wall and the handrail.

Exceptions:

1. Handrails shall be permitted to be interrupted by a newel post at a turn.

2. The use of a volute, turnout or starting easing shall be allowed over the lowest tread.

315.3 Guardrail Details. Porches, balconies or raised floor surfaces located more than 30 inches (762mm) above the floor or grade below shall have guardrails not less than 36 inches (914mm) in height. Open sides of stairs with a total rise of more than 30 inches (762mm) above the floor or grade below shall have guardrails not less than 34 inches (864mm) in height measured vertically from the nosing of the treads.

315.4 Guardrail Opening Limitations. Required guardrails on open sides of stairways, raised floor areas, balconies and porches shall have intermediate rails or ornamental closures which do not allow passage of an object 4 inches (102mm) or more in diameter.

405.1 Concrete or Masonry Foundations. Drains shall be provided around all concrete or masonry foundations enclosing habitable or usable spaces located below grade. Drainage tiles, gravel or crushed stone drains, perforated pipe or other approved systems or materials shall be installed at or below the area to be protected and shall discharge by gravity or mechanical means into an approved drainage system. Gravel or crushed stone drains shall extend at least 1-foot (305mm) beyond the outside edge of the footing and 6-inches (153 mm) above the top of the footing and be covered with an approved filter membrane material. The top of the open joints of drain tiles shall be protected with strips of building paper, and the drainage tiles or perforated pipe shall be placed on a minimum of 2-inches (51mm) of washed gravel or crushed rock at least on sieve size larger than the tile joint opening or perforation and covered with not less than 6-inches (153 mm) of the same material.

Exception: A drainage system is not required when the foundation is installed on well-drained ground or san-gravel mixture soils according to the Unified Soil Classification System, Group I Soils, as detailed in Table 405.1

405.2.1 Base. A porous layer of gravel, crushed stone or coarse sand shall be placed to a minimum thickness of 4-inches (102 mm) under the basement floor. Provision shall be made for automatic draining of this layer and the gravel or crushed stone wall footings.

405.2.2 Moisture Barrier. A 6-mil thick (0.15mm) polyethylene moisture barrier shall be applied over porous layer with the basement floor constructed over the polyethylene.

406.1 Concrete and Masonry Foundation Dampproofing. Except where required to be waterproofed by Section 406.2, foundation walls enclosing habitable or storage space shall be dampproofed from the top of the footing to the finished grade. Masonry walls shall be dampproofed by applying not less than 3/8"-inch (9.5 mm) portland cement parging to the exterior of the wall. The parging shall be covered with a bituminous coating, 3-pounds per square yard (1.63 kg/m2) of acrylic modified cement, 1/8-inch (3.2 mm) coat of surface-bonding mortar complying with ASTM C887 or any material permitted for waterproofing in Section 406.2. Concrete walls shall be dampproofed by applying any one of the listed damproofing materials or any one of the waterproofing materials listed in Secion 406.2 to the exterior of the wall. 

406.2 Concrete and Masonry Foundation Waterproofing. In areas where a high water table or other severe soil-water conditions are known to exist, exterior foundation walls enclosing habitable or storage space shall be waterproofed  with a membrane extending from the top of the footing to the finished grade. The membrane shall consist of 2-ply hot-mopped felts, 55-pound (25kg) roll roofing, 6-mil (0.15 mm) polyvinyl chloride, 6-mil (0.15 mm) polyethylene or 40-mil (1 mm) polymer-modified asphalt. The joints in the membrane shall be lapped and sealed with an adhesive compatible with the waterproofing membrane.

703.2 Weather-Resistant Sheathing Paper. Asphalt-saturated felt free from holes and breaks and weighing not less than 14 pounds pre 100 square feet (0.683 kg/sq m) or other approved weather-resistant material shall be applied over studs or sheathing of all exterior walls as required in Table 703.4. Such felt or material shall be applied horizontally, with the upper layer lapped over the lower layer not less than 2-inches (51 mm). Where joints occur, felt shall be lapped not less than 6-inches (153 mm)

703.2.1 Felt or material. Such felt or material may be omitted.

1. In detached accessory buildings.

2. Under panel siding with shiplap joints or battens.

3. Under exterior wall finish materials as permitted in Table 703.4

4. Under paperbacked stucco lath.

5. Over water-repellent sheathing materials.

703.7.2 Attachment. Masonry veneer shall be attached to the supporting wall with corrosion-resistant metal ties.

703.7.2.1 Size and Spacing. Veneer ties, if strand wire, shall not be less in thickness than No. 9 U.S. gage wire and shall have a hood embedded in the mortar joint, or if sheet metal, not less than No.22 U.S. gage by 7/8 inch (22 mm) corrugated. Each tie shall be spaced not more than 24 inches (610 mm) on center horizontally and shall support not more than 3.1/4 square feet (0.302 sq m) of wall area.

703.7.3 Flashing. Flashing shall be located beneath the first course of masonry above finished ground level above the foundation wall or slab, and at other points of support, including structural floors, shelf angles and lintels when masonry veneers are designed in accordance with Section 703.7. See Section 703.8 for additional requirements.

703.7.4 Weepholes. Weepholes shall be provided in the outside wythe of masonry walls at a maximum spacing of 33 inches (838 mm) on center. Weepholes shall not be less than 3/16 inch (4.8 mm) in diameter. Weepholes shall be located immediately above the flashing.

703.7.2.2 Paper backing required. When applied over stud construction the studs shall be spaced a maximum of 24 inches (610 mm) on center and approved paper shall first be applied over the sheathing or wires between the studs, except as otherwise provided in Section 703.2 and mortar shall be slushed into the 1-inch (25 mm) space between facing and paper.

Exception: As an alternate, an air space of at least 1-inch (25 mm) may be maintained between the backing and the veneer, in which case a weather-resistant membrane or felt sheathing paper or approve water-repellent sheathing shall be applied over studs.

703.8 Flashing. Approved corrosion-resistive flashing shall be provided at top and sides of all exterior window and door openings in such a manner as to be leak proof, except that self-flashing windows having a continuous lap of not less than 1.1/8" (28mm) over the sheathing material around the perimeter of the opening, including corners, do not require additional flashing; jamb flashing may also be omitted when specifically approved by the building official. Similar flashings shall be installed at the intersection of chimneys or other masonry construction with frame or stucco walls, with projecting lips on both sides under stucco copings; under and at the ends of masonry, wood or metal copings and sills; continuously above all projecting wood trim; where exterior porches, decks or stairs attach to a wall or floor assembly of wood-frame construction; at wall and roof intersections.

806.3 Vent Clearance. Where eave or cornice vents are installed insulation shall not block the free flow of air. A minimum of 1-inch (25 mm) shall be provided between the insulation and the roof sheathing at the location of the vent.

807.1 Accessible Attic Access. A readily accessible attic access framed opening not less than 22 inches by 30 inches (559 mm by 762 mm) shall be provided to any attic area having a clear height of over 30 inches (762 mm)

1001.5 Termination. Chimneys shall extend at least 2 feet (610 mm) higher than any portion of the building within 10 feet (3048 mm), but shall not be less than 3 feet (914mm) above the point where the chimney passes through the roof.

Code Keying BOCA National Building Code 1996 Edition

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