The minimum roof slope requirement for metal panels varies depending on panel connection conditions.  The required roof slope varies with application of materials and use. See the below Florida Building Code Fifth Edition (2014, 2017) sections below to determine which slope is appropriate based on your specific design scenario.

 

METAL ROOF PANEL. An interlocking metal sheet having

a minimum installed weather exposure of 3 square feet

(0.279 m2) per sheet.

 

1507.4 Metal roof panels. The installation of metal roof panels

shall comply with the provisions of this section.

 

1507.4.1 Deck requirements. Metal roof panel roof coverings

shall be applied to a solid or closely fitted deck,

except where the roof covering is specifically designed to

be applied to spaced supports.

 

1507.4.2 Deck slope. Minimum slopes for metal roof panels

shall comply with the following:

  1. The minimum slope for lapped, nonsoldered seam

metal roofs without applied lap sealant shall be three

units vertical in 12 units horizontal (25-percent

slope).

  1. The minimum slope for lapped, nonsoldered seam

metal roofs with applied lap sealant shall be one-half

unit vertical in 12 units horizontal (4-percent slope).

Lap sealants shall be applied in accordance with the

approved manufacturer’s installation instructions.

  1. The minimum slope for standing seam of roof systems

shall be one-quarter unit vertical in 12 units

horizontal (2-percent slope).

 

1507.5.2 Deck slope. Metal roof shingles shall not be
installed on roof slopes below three units vertical in 12
units horizontal (25-percent slope).

1507.6.2 Deck slope. Mineral-surfaced roll roofing shall
not be applied on roof slopes below one unit vertical in 12
units horizontal (8-percent slope).

1523.6.5.2.4 Metal shingles/panels. All metal roofing
shall be tested in compliance with TAS 100. All
metal roofing shall resist a minimum wind uplift
resistance as determined by Chapter 16 (High-
Velocity Hurricane Zones) for a roof slope of 9.5
degrees (0.0166 rad) and a roof mean height of 15
feet (4.6 m).

1523.6.5.2.6 Fiber cement shingle or tile panels.
All fiber cement shingles or tiles shall resist a minimum
wind uplift resistance as determined by Chapter
16 (High-Velocity Hurricane Zones) for a roof
slope of 9.5 degrees (0.0166 rad) and a roof mean
height of 15 feet (4.6 m).

2308.7 [Wood] Roof and ceiling framing. The framing details
required in this section apply to roofs having a slope of not
less than three units vertical in 12 units horizontal (25-percent
slope). Where the roof slope is less than three units vertical in
12 units horizontal (25-percent slope), members supporting
rafters and ceiling joists such as ridge board, hips and valleys
shall be designed as beams.

 

 

Jan 30, 2018   1688    Codes & Standards    
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