Delete Section R313, "Automatic Fire Sprinkler Systems" and
replace with the following:
"Per Missouri Revised Statutes Section 67.281.1 A builder of
one- or two-family dwellings or townhouses shall offer to any purchaser
on or before the time of entering into the purchase contract the option,
at the purchaser's cost, to install or equip fire sprinklers
in the dwelling or townhouse. Notwithstanding any other provision
of law to the contrary, no purchaser of such a one- or two-family
dwelling or townhouse shall be denied the right to choose or decline
to install a fire sprinkler system in such dwelling or townhouse being
purchased by any code, ordinance, rule, regulation, order, or resolution
by any county or other political subdivision. Any county or other
political subdivision shall provide in any such code, ordinance, rule,
regulation, order, or resolution the mandatory option for purchasers
to have the right to choose and the requirement that builders offer
to purchasers the option to purchase fire sprinklers in connection
with the purchase of any one- or two-family dwelling or townhouse.
The provisions of this Section shall expire on December 31, 2019;
and 67.281.2 Any governing body of any political subdivision that
adopts the 2009 International Residential Code for One- and Two- Family
Dwellings or a subsequent Edition of such code without mandated automatic
fire sprinkler systems in Section R313 of such code shall retain the
language in Section R317 of the 2006 International Residential Code
for One- and Two- Family Dwellings (R317.1) and Townhomes (R317.2)."
"Section R317 Dwelling Unit Separation
R317.1 Two-family dwellings. Dwelling units
in two-family dwellings shall be separated from each other by wall
and/or floor assemblies having not less than 1-hour fire-resistance
rating when tested in accordance with ASTM E 119. Fire-resistance-rated
floor-ceiling and wall assemblies shall extend to and be tight against
the exterior wall, and wall assemblies shall extend to the underside
of the roof sheathing.
Exceptions:
1. A fire-resistance rating of one-half (1/2) hour shall be
permitted in buildings equipped throughout with an automatic sprinkler
system installed in accordance with NFPA 13.
2. Wall assemblies need not extend through attic spaces when
the ceiling is protected by not less than five-eighths (5/8) inch
(15.9 mm) Type X gypsum board and an attic draft stop constructed
as specified in Section R502.12.1 is provided above and along the
wall assembly separating the dwellings. The structural framing supporting
the ceiling shall also be protected by not less than one-half (1/2)
inch (12.7 mm) gypsum board or equivalent.
R317.1.1 Supporting construction. When floor
assemblies are required to be fire-resistance-rated by Section R317.1,
the supporting construction of such assemblies shall have an equal
or greater fire-resistive rating.
R317.2 Townhouses. Each townhouse shall be
considered a separate building and shall be separated by fire-resistance-rated
wall assemblies meeting the requirements of Section R302 for exterior
walls.
Exception: A common two (2) hour fire-resistance-rated
wall is permitted for townhouses if such walls do not contain plumbing
or mechanical equipment, ducts or vents in the cavity of the common
wall. Electrical installations shall be installed in accordance with
Chapters 33 through 42. Penetrations of electrical outlet boxes shall
be in accordance with Section R317.3.
R317.2.1 Continuity. The fire-resistance-rated
wall or assembly separating townhouses shall be continuous from the
foundation to the underside of the roof sheathing, deck or slab. The
fire-resistance rating shall extend the full length of the wall or
assembly, including wall extensions through and separating attached
enclosed accessory structures."