Page 174 - Des Moines - Zoning, Planning and Design Ch 134, 135

135-2. DeSiGN reQUireMeNtS DRAFT

Facade and Roof Materials

3. Metal for beams, lintels, trim, exposed structure, an example, where Material A is brick, Material B
and other ornamentation. metal panels, and Material C stucco.
4. Split-faced, burnished, glazed, or honed concrete c. Shadow lines on Surfaces. Shadow lines shall be
masonry units or block cast stone concrete created with solid materials of a thickness that is
elements. greater than 2 inches, such as cast stone, masonry,
5. Vinyl for window trim and soffits. Soffit panels to or stone. For example, cast stone pieces may be
be minimum .05 inches thick. offset to create a shadow, where the convex corner
of the piece is used to create the corner of the
6. Cast stone concrete elements. detail.

7. Two- or three-coat cement-based or cement- D. Appropriate Grade of Materials. Except on
hybrid stucco for surfaces. House and Row building types, all doors, windows,
8. Terra cotta or ceramic tiles or panels. and hardware shall be of commercial grade quality.
9. Face-sealed EIFS synthetic stucco assemblies and e. Applique Materials. Materials with thickness
decorative architectural elements. of less than 2.5 inches, including but not limited
to stucco, shall not be used or formed to create
2.2.4 PitcHeD rOOF MAteriAlS shadow lines.
Allowed pitched roof materials include dimensional F. Stucco installation. Stucco, when allowed, shall
asphalt composite shingles, wood shingles and shakes, be of the highest installation quality, meeting the
metal tiles or standing seam, slate, and ceramic tile. following criteria:
Engineered wood or slate may be approved during 1. Jointing. All stucco joints shall be aligned
the Site Plan process with an approved sample and along the facade in the pattern shown on the
documented examples of successful, high quality local elevations submitted for the site plan approval.
installations.
Joints shall also align with the locations of
2.2.5 MAteriAlS iNStAllAtiON QUAlitY windows and doors and other changes in
A. intent. The intent of the materials installation material.
quality requirements is to advance the quality of 2. Construction. The stucco wall assembly shall be
construction, durability, and aesthetics of new indicated on the plans specifying stucco type and
buildings, specifically related to application and construction.
detailing of facade materials.
B. changes in Material. Changes in vertical surface
materials for buildings outside N districts shall meet
the following standards: minimum
1. Changes in Surface Materials. Changes in surface roof surface 12” depth
materials, whether major materials or minor Material concave corner roof surface
materials, shall occur only at concave corners, C Material
where the distance to the next generally parallel convex corner A
facade plane is a minimum of 12 inches. Surface Material concave corner
C
materials are materials intended to cover the convex corner Material
A
facade surface (such as unit materials, siding, roof surface
minimum
stucco, panels) and do not include detail 12” depth concave corner concave corner
materials, such as but not limited to cast stone Material
for lintels or cornices, exposed metal beams, or B
any material used to create an shadow line. See
Figure 2.3-C.
2. Materials Hierarchy. unit materials shall be minimum
elevated from the face of the building above less 12” depth
detailed, surface materials. For example, stucco,
as a constant surface material, shall be recessed grade grade
behind a bricked surface. See Figure 2.3-C for
Figure 2.3-C. Diagram of Allowable Changes in Surface Materials

135-2-4 DRAFT AuGuST 3, 2017