Page 193 - 8.5X11__AZ_VERSION_2_9-12-07

Individual concrete or masonry piers shall project at least 8 inches (203 mm) above exposed
ground unless the columns or posts that they support are of approved wood of natural resis-
tance to decay or treated wood is used.
[For SPCB] Correct the conditions in frame and stucco walls and similar appurtenant
construction so that the wood framing is separate from the main structure by a complete con-
crete or masonry plug with no voids that will allow infestations to enter the structure from the
wall. If there is no plug, the foundation shall be 2 inches (51 mm) or more above the grade
levels and at least as high as the adjoining slabs or a 4-inch (102 mm) concrete barrier seat off
installed.
2306.6 Girders Entering Masonry or Concrete Walls. Ends of wood girders entering ma-
sonry or concrete walls shall be provided with a ½-inch (12.7 mm) air space on tops, sides and
ends unless approved wood of natural resistance to decay or treated wood is used.
2306.7 Under-floor Ventilation. Under-floor areas shall be ventilated by an approved me-
chanical means or by openings into the under-floor walls [for SPCB] not less than 1 ½ square
feet (0.13 m²) for each 25 linear feet (7620 linear mm) of exterior wall. Such openings shall have
a net area of not less than 1 square foot for each 150 square feet (0.067 m² for each 10 m²) of
under-floor area. Openings shall be located as close to corners as practical and shall provide
cross ventilation. The required area of such openings shall be approximately equally distributed
along the length of at least two opposite sides. The shall be covered with corrosion-resistant
wire mesh with mesh openings of ¼ inch (6.4 mm) in dimension [For SPCB] not less than ¼
inch (6.4 mm) nor more than ½ inch (13 mm) in any dimension. Where moisture due to climate
and groundwater conditions is not considered excessive, the building official may allow operable
louvers and may allow the required net area of vent openings to be reduced to 10 percent of
the above, provided the under-floor grounded surface area is covered with an approved vapor
retarder.
EXCEPTION [For SPCB]: For purpose of structural pest control inspections, ventilation shall
be considered inadequate when the lack thereof has contributed to the growth of wood-destroy-
ing pests or organisms.
2306.8 Wood and Earth Separation. Protection of wood against deterioration as set forth in
the previous sections for specified applications is required. In addition, wood used in construc-
tion of permanent structures and located nearer than 6 inches (152 mm) to earth shall be treat-
ed wood or wood of natural resistance to decay as defined in Section 2302.1. Where located
on concrete slabs placed on earth, wood shall be treated wood or wood of natural resistance to
decay. Where not subject to water splash or to exterior moisture and located on concrete hav-
ing a minimum thickness of 3 inches (76 mm) with an impervious membrane installed between
concrete and earth, the wood may be untreated and of any species.
Where planter boxes are installed adjacent to wood frame walls, a 2-inch-wide (51 mm)
air space shall be provided between the planter and the wall. Flashings shall be installed when
the air space is less than 6 inches (152 mm) in width. Where flashing is used, provisions shall
be made to permit circulation of air in the air space. The wood-frame wall shall be provided with
an exterior wall covering conforming to the provisions of 2310.
2306.9 Wood Supporting Roofs and Floors. Wood structural members supporting moisture-
permeable floors or roofs that are exposed to the weather, such as concrete or masonry slabs,
shall be approved wood of natural resistance to decay or treated wood unless separated from
such floors or roofs by an impervious moisture barrier.
200
Individual concrete or masonry piers shall project at least 8 inches (203 mm) above exposed
ground unless the columns or posts that they support are of approved wood of natural resis-
tance to decay or treated wood is used.
[For SPCB] Correct the conditions in frame and stucco walls and similar appurtenant
construction so that the wood framing is separate from the main structure by a complete con-
crete or masonry plug with no voids that will allow infestations to enter the structure from the
wall. If there is no plug, the foundation shall be 2 inches (51 mm) or more above the grade
levels and at least as high as the adjoining slabs or a 4-inch (102 mm) concrete barrier seat off
installed.
2306.6 Girders Entering Masonry or Concrete Walls. Ends of wood girders entering ma-
sonry or concrete walls shall be provided with a ½-inch (12.7 mm) air space on tops, sides and
ends unless approved wood of natural resistance to decay or treated wood is used.
2306.7 Under-floor Ventilation. Under-floor areas shall be ventilated by an approved me-
chanical means or by openings into the under-floor walls [for SPCB] not less than 1 ½ square
feet (0.13 m²) for each 25 linear feet (7620 linear mm) of exterior wall. Such openings shall have
a net area of not less than 1 square foot for each 150 square feet (0.067 m² for each 10 m²) of
under-floor area. Openings shall be located as close to corners as practical and shall provide
cross ventilation. The required area of such openings shall be approximately equally distributed
along the length of at least two opposite sides. The shall be covered with corrosion-resistant
wire mesh with mesh openings of ¼ inch (6.4 mm) in dimension [For SPCB] not less than ¼
inch (6.4 mm) nor more than ½ inch (13 mm) in any dimension. Where moisture due to climate
and groundwater conditions is not considered excessive, the building official may allow operable
louvers and may allow the required net area of vent openings to be reduced to 10 percent of
the above, provided the under-floor grounded surface area is covered with an approved vapor
retarder.
EXCEPTION [For SPCB]: For purpose of structural pest control inspections, ventilation shall
be considered inadequate when the lack thereof has contributed to the growth of wood-destroy-
ing pests or organisms.
2306.8 Wood and Earth Separation. Protection of wood against deterioration as set forth in
the previous sections for specified applications is required. In addition, wood used in construc-
tion of permanent structures and located nearer than 6 inches (152 mm) to earth shall be treat-
ed wood or wood of natural resistance to decay as defined in Section 2302.1. Where located
on concrete slabs placed on earth, wood shall be treated wood or wood of natural resistance to
decay. Where not subject to water splash or to exterior moisture and located on concrete hav-
ing a minimum thickness of 3 inches (76 mm) with an impervious membrane installed between
concrete and earth, the wood may be untreated and of any species.
Where planter boxes are installed adjacent to wood frame walls, a 2-inch-wide (51 mm)
air space shall be provided between the planter and the wall. Flashings shall be installed when
the air space is less than 6 inches (152 mm) in width. Where flashing is used, provisions shall
be made to permit circulation of air in the air space. The wood-frame wall shall be provided with
an exterior wall covering conforming to the provisions of 2310.
2306.9 Wood Supporting Roofs and Floors. Wood structural members supporting moisture-
permeable floors or roofs that are exposed to the weather, such as concrete or masonry slabs,
shall be approved wood of natural resistance to decay or treated wood unless separated from
such floors or roofs by an impervious moisture barrier.
187