30.1
Exterior construction requirements and standards:
A.
Definitions:
For the purpose of this section the following definitions shall apply:
1.
Masonry construction shall include all construction of stone material, brick material, concrete masonry units, stucco or concrete panel construction, which is composed of solid, cavity, faced, or veneered-wall construction.
The standards for masonry construction types are listed below:
a.
Stone material:
Masonry construction using stone material may consist of granite, marble, limestone, slate, river rock, and other hard and durable naturally occurring all-weather stone. Cut stone and dimensioned stone techniques are acceptable.
b.
Brick material:
Brick material used for masonry construction shall be hard fired (kiln fired) clay or slate material which meets the latest version of ASTM standard C216, Standard Specification for Facing Brick (Solid Masonry Unit Made of Clay or Shale), and shall be Severe Weather (SW) grade, and Type FBA or FBS or better. Unfired or underfired clay, sand, or shale brick are not allowed.
c.
Concrete masonry units:
Concrete masonry units used for masonry construction shall meet the latest version of the following applicable specifications; ASTM C90, Standard Specification for Hollow Load Bearing Concrete Masonry Units; ASTM C145, Standard Specification for Solid Load Bearing Masonry Units; ASTM C129, Standard Specification for Hollow and Solid Non-load Bearing Units. Concrete masonry units shall have an indented, hammered, split face finished or other similar approved architectural finish as approved by the city council. Smooth surface blocks are not permitted. Lightweight concrete block or cinderblock construction is not acceptable as an exterior finish.
d.
Concrete panel construction:
Concrete finish or pre-cast panel (tilt wall) construction shall be painted, fluted, exposed aggregate, or other approved architectural concrete finish. Smooth or untextured concrete finishes are not acceptable.
e.
Stucco:
A textured finish applied over a portland cement base or similar material applied by the Type H method applied over metal or wire lath.
2.
Acceptable glass and metal standards are as follows:
a.
Glass walls shall include glass curtain walls or glass block construction. Glass curtain wall shall be defined as an exterior wall which carries no structural loads, and which may consist of the combination of metal, glass, or other surfacing material supported in a metal framework.
b.
Metal walls shall include profiled panels, deep ribbed panels and concealed fastener systems. Exterior finish shall be film laminated or baked-on enamel painted to the wall manufacturer's standards.
30.2
Construction standards:
A.
Construction standards:
The standards and criteria contained within this section are deemed to be minimum standards and shall apply to all new, altered or repaired construction occurring within the city.
1.
Residential:
a.
All residential buildings and structures located in the residential zoning districts SF-40 through 2F shall be of exterior fire-resistant construction having at least 80 percent of the total exterior walls above grade level and below the first floor plate line, excluding doors and windows, constructed of brick, stone, or material of equal characteristics in accordance with the city's building code and fire prevention code. Strict adherence to this rule shall not be such as to prevent architectural creativity.
Consideration for exceptions to the above requirements shall be based only on the following:
b.
All principal buildings and structures located in the MF district shall be of exterior fire-resistant construction having at least 90 percent of the total exterior walls, excluding doors and windows, constructed of brick, stone, or other material of equal characteristics in accordance with the city's building code and fire prevention code.
Consideration for exceptions to the above requirements shall be based only on the following:
c.
Concrete or metal exterior materials are not permitted on any residential structure.
2.
Nonresidential:
a.
All nonresidential uses shall be of exterior fire-resistant construction having at least 75 percent of the total exterior walls above grade level, excluding doors and windows, constructed of masonry or glass wall construction, in accordance with the city's building code and fire prevention code. Building facades which face or side any public street or residential zoning districts, or otherwise have public exposure, shall be constructed entirely of stone, brick, or glass wall construction. Strict adherence to this rule shall not be such as to prevent architectural creativity. Consideration for exceptions shall be based only on the following and subject to approval by the city council:
b.
Metal accessory buildings over 200 square feet may be located in the commercial district, and the light industrial district (in the LI district by conditional use permit) zoning districts and shall be constructed in accordance with the city's building code and fire prevention code, except that any structure within 200 feet of a public street or residential zoning district shall be constructed of stone, brick or glass wall construction (also see section 29 for conditional use permit requirements). Metal exterior walls shall be compatible in color with the principal building and existing surrounding structures.
Accessory buildings 200 square feet or less are excluded from these provisions. Barns on property of two acres or more if such barns are used solely for agricultural as distinguished from commercial or industrial purposes shall be exempt from provisions of this section. Mobile homes otherwise lawfully existing under the provisions of the zoning ordinance shall also be excluded from provision of this section.
When walls are metal, the use of corrugated panels is prohibited; profiled panels, deep ribbed panels and concealed fastener systems are permitted. Exterior finish for metal walls fronting or siding on public streets shall be of a permanent material such as a baked or enamel finish or painted to the wall manufacturer's standards. The use of galvanized, corrugated aluminum coated, zinc-aluminum coated, or unpainted exterior metal finish is prohibited.
c.
Concrete panel/tilt wall construction is permitted in the LI zoning district.
B.
Procedure for determining alternative exterior materials:
1.
All requests for alternative exterior building materials shall be noted and described on a site plan. If requested by the city, a sample of the material may be required to be submitted with the site plan.
2.
The city may approve an alternative exterior material if it is determined it is equivalent or better than masonry according to the criteria listed for exceptions above as part of the approval of a site plan.
C.
Temporary construction buildings:
Temporary buildings and temporary building material storage areas to be used for construction purposes may be permitted for a specific period of time in accordance with a permit issued by the building inspector and subject to periodic renewal by the inspector for cause shown. Upon completion or abandonment of construction or expiration of permit, such field offices and buildings shall be removed at the satisfaction of the building official.
(Ordinance 99-817, secs. 1, 2, adopted 11/9/99)