Page 158 - Des Moines - Zoning, Planning and Design Ch 134, 135

135-1. BUilDiNG tYPeS DRAFT

Roof Types

B. configurations. The following configurations are 1.17.4 PArAPet rOOF tYPe
permitted, unless otherwise expressly stated in the (Refer to Figure 1.17-A). A parapet is a low wall
applicable building type regulations. projecting above a building’s roof along the perimeter
1. Hipped, gabled, and combination of hips and of the building.
gables are permitted. A. Parapet Height. Height is measured from the
2. Butterfly (inverted gable roof) and shed roofs top of the upper story to the top of the parapet.
are permitted with a maximum height of 8 feet, Minimum height is 2 feet with a maximum height of
inclusive of overhang. 6 feet.
3. Gambrel roofs are permitted on House E only B. Horizontal Shadow lines. A shadow line must
and the main ridge must be perpendicular to the define the parapet from the upper stories of the
street. building and must also define the top of the cap. See
4. Mansard roofs are not permitted on any building. 135-7.2.22 for definition of shadow line.
c. Parallel ridge line. When the main ridge line c. Occupied Space. Occupied space may not be
runs parallel to the front lot line, a gabled end or incorporated behind this roof type.
perpendicular ridge line must occur at least every D. rooftop Appurtenances. With the exception
100 feet of roof, unless expressly defined by the of solar panels, any rooftop appurtenances must
applicable building type regulation. (Refer to Figure be located towards the rear or interior of the
1.16-E). parapet roof. See 135-2.5 for screening of rooftop
D. eaves required. Eaves are required on all pitched appurtenances.
roofs. The depth of the eave is measured from the 1.17.5 FlAt rOOF tYPe
building facade to the outside edge of the eave. (Refer to Figure 1.17-B). This roof type is a visibly flat
Eaves must have a depth of at least 12 inches on roof with overhanging eaves.
all building types except House C, unless otherwise
noted in the building type regulations. A. configuration. The roof may not have a visible
e. roof Height. Roofs without occupied space and/or slope from the street and eaves are required on all
primary and non-primary frontage facades.
dormers must have a maximum height on primary
and non-primary frontage facades equal to no more B. eave Depth. Eave depth is measured from the
than 1.5 times the upper story floor-to-floor height building facade to the outside edge of the eave.
utilized on the building. Eaves must have a depth of at least 14 inches.
F. Occupied Space. Occupied space may be c. eave thickness. Eave thickness is measured at
incorporated behind this roof type. If used, the the outside edge of the eave, from the bottom of
space counts as a half story. the eave to the top of the eave. Eaves must be a
G. rooftop Appurtenances. With the exception of minimum of 6 inches thick.
solar panels, any rooftop appurtenances must be D. interrupting Vertical Walls. Vertical wall planes
recessed within the pitched roof with no visibility on may interrupt the eave and extend above the top of
any street elevation drawing.

Eave Vertical Wall
Depth Plane
Roof
Roof
Height Eave
Thickness
upper floor Shadow Lines upper floor

Figure 1.17-B. Example of a Flat Roof Type
Figure 1.17-A. Example of a Parapet Roof Type

135-1-66 DRAFT AuGuST 3, 2017