Window / Door Replacement 1. Provide two copies of a plot plan showing the size and locations of all doors and windows in the structure. Mark each opening that is to be replaced with a new door or window; note the quantity of the windows at each opening and the type of window or door to be installed i.e. single hung, horizontal slider, fixed glass, glass door, etc. 2. Provide design pressures for each opening as prescribed in Chapter 16 of the Florida Building Code or if a single family or duplex residence, design pressures can be obtained from the Broward County Fenestration Wind Load Chart. Show the mean roof height of the building on the plan. 3. Provide a current Product Approval for each type of window and door, which you intend to install. Please contact the store/supplier where you purchased your products to obtain the required Product Approval documents. 4. The Product Approvals contain charts and tables, which provide component and fastener options- including window size, glazing thickness, mounting details, etc. Highlight or mark-up site specific conditions. 5. Shutters are required if more than 25% of the openings of the building are being replaced on a single family or duplex residence; and you must provide Product Approval for the shutters. Impact resistance is required on all commercial retrofits regardless of size or amount. 6. Two or more windows located within one opening require a mullion. A Product Approval must be submitted for the mullion with installation options highlighted. SAMPLE: Must include property address
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Window / Door Replacement
1. Provide two copies of a plot plan showing the size and locations of all doors and windows in the structure. Mark each opening that is to be replaced with a new door or window; note the quantity of the windows at each opening and the type of window or door to be installed i.e. single hung, horizontal slider, fixed glass, glass door, etc.
2. Provide design pressures for each opening as prescribed in Chapter 16 of the Florida Building
Code or if a single family or duplex residence, design pressures can be obtained from the Broward County Fenestration Wind Load Chart. Show the mean roof height of the building on the plan.
3. Provide a current Product Approval for each type of window and door, which you intend to
install. Please contact the store/supplier where you purchased your products to obtain the required Product Approval documents.
4. The Product Approvals contain charts and tables, which provide component and fastener options- including window size, glazing thickness, mounting details, etc. Highlight or mark-up site specific conditions.
5. Shutters are required if more than 25% of the openings of the building are being replaced on a single family or duplex residence; and you must provide Product Approval for the shutters. Impact resistance is required on all commercial retrofits regardless of size or amount.
6. Two or more windows located within one opening require a mullion. A Product Approval must be submitted for the mullion with installation options highlighted.
SAMPLE:
Must include property address
Retrofit of Windows, Doors, Garage Doors, Shutters, and Skylights
FBC 2004 Existing Building, Alteration Level 1
At the Board of Rules and Appeals meeting of February 9, 2006, an interpretation was approved for Retrofit of
Windows, Doors, Garage Doors, Shutters and Skylights, of the 2004 Florida Building Code as follows:
1. Window or door buck inspections are not required the buck shall comply with Section 1714.5.4.1
specifically, unless otherwise tested, buck shall extend beyond the entire face of the window of door
frame such that full support of the frame is provided.
2. A Florida Professional Engineer or Architect may modify the buck with fasteners as specified in a
Notice of Acceptance. Such modification must be documented with a signed and sealed letter or
drawing.
3. To obtain the required design pressure for a specific opening at a specific site, an individual must
utilize one of the following and submit documentation as indicated.
a. A site specific (signed and sealed) by a Florida Professional Engineer or Architect, indicating
the location of all retro openings and the required design pressure.
b. A site-specific plan (not sealed) indicating the location of all openings accompanied by a worst-
case design pressure chart (signed and sealed) prepared by a Florida P.E. or Architect.
c. A site-specific plan (not sealed) indicating the location of all openings and indicating the
required design pressure based on FBC table 1609.6(b & d) FRC Table R301.2.2 (2 & 3) for
windows, doors, shutters, and skylights and table 1609.6E for garage doors.
Note: FBC Table 1609.6 (b & d) and FRC Table 1609 R301.2.2 (2 & 3) and 1609.6E has been
adopted for retrofit windows, doors, shutters and skylights (only with a permit application date
preceding September 1, 1994*, and is limited to building with a roof mean height of 30’.
4. Required design pressure is required to meet FBC Table 1609.6 (b & d) FRC Table R301.2.2 (2 & 3)
or ASCE-7-02 for windows, doors, shutters and skylights and 1609.6E for garage doors.
Note: FBC Table 1609.6 (b & d) FRC Table R301.2.2 (2 & 3) 1609.6E may be used to
determine wind pressure for retrofit of windows, door, garage doors and skylights, but only on
buildings with a permit application prior to September 1, 2004, * and shall be limited to
buildings with a maximum roof mean height of 30’.
*Buildings with a permit application date on or after September 1, 1994, design measures were required to be
shown on plans, should be used for retro.
EFFECTIVE DATE: JANUARY 20, 2020
MBATISTA
Typewritten Text
MBATISTA
Typewritten Text
Mean Roof HeightTributary Area 10 20 35 50 100 500 10 20 35 50 100 500
Roof and Wall Zone Chart DiagramsWall Pressure Chart Flat Roof Uplift Chart Gable Roof Uplift Chart Hip Roof Uplift Chart
Wall Pressure For All Roof Types Garage/Door Pressures15 Ft 20 Ft <= 30 Ft
Instructions on how to use these Charts: Determine Mean Roof Height, h , which is top of roof for flat roofs or the mean roof height for pitched roofs. Find your least horizontal dimension for your building, not including a overhang if it occurs. Calculate the value of, a , = 10% of least horizontal dimension or 0.4*h, whichever is
smaller, but not less than either 4% of least horizontal dimension or 3 feet. If your roof height is less than 30 feet, but not exactly 15, 20, or 25 feet, you will need to go to the next higher roof height. If your Mean Foof Height is higher than 30 feet, these charts do not apply. Review the diagram which illustrate the wall and roof zones and determine the wind zone in which the component is located. Determine the tributary area of the component. If the tributary area falls in between values, use the value of the smaller tributary area. Select the positive and negative wind pressures corresponding to the wall or roof zone where your component is located. Door
pressures shown are for the most common door sizes and are worst case for heights <= 30 Feet.
16 73 76 7
Broward County Fenestration Voluntary Wind Load Chart*Per ASCE 7‐16 Part 1 and FBC (2020) for Retrofitting in Accordance with Formal Interpretation #24
For Detached One‐and Two family dwellings and Multiple Single‐Family Dwellings (Townhouses) with Mean Roof Height ≤ 30 feetWind 170 mph (3‐second gust) / Exposure C** / Kd = 0.85 / Kzt = 1.0 / Pressures are in PSF / Not for use in Coastal (Exposure 'D' areas)
* Using Allowable Stress Design methodology (P = 0.6w) / ** Exposure C or D shall be determined according to ASCE 7‐16 Section 26.7 (Exposure Categories)
SIMPLIFIED ROOF UPLIFT CHART FOR ROOFING APPLICATIONSThis simplified chart represents the worst case wind pressures for the various roof slopes and heights. This chart is based on a Tributary Area = 10 SF which is required for roofing applications. If the roof height is less than 30 feet, but not exactly 15, 20, or 25 feet, you will need to go to the next higher roof height. If your roof height is higher
than 30 feet, these charts do not apply. Refer to Roof Chart Diagrams on Page 1 for Roof Zone Locations
Mean Roof Height = 15 FeetFlat Roof Gable Roof 1.51 to 4:12 Gable Roof 4.1 to 6:12 Gable Roof 6.1: to 12:12 Hip Roof 1.51 to 4:12 Hip Roof 4.1 to 6:12
Mean Roof Height = 20 FeetFlat Roof Gable Roof 1.51 to 4:12 Gable Roof 4.1 to 6:12 Gable Roof 6.1: to 12:12 Hip Roof 1.51 to 4:12 Hip Roof 4.1 to 6:12
Mean Roof Height = 25 FeetFlat Roof Gable Roof 1.51 to 4:12 Gable Roof 4.1 to 6:12 Gable Roof 6.1: to 12:12 Hip Roof 1.51 to 4:12 Hip Roof 4.1 to 6:12
* If Parapet >= 3 Ft occurs around entire building use the same Zone 2 pressure for Zone 3 and use the higher positive pressure shown
Mean Roof Height = 30 FeetFlat Roof Gable Roof 1.51 to 4:12 Gable Roof 4.1 to 6:12 Gable Roof 6.1: to 12:12 Hip Roof 1.51 to 4:12 Hip Roof 4.1 to 6:12
Page 3 of 3
One North University Drive
Suite 3500-B
Plantation, Florida 33324
Phone: 954-765-4500
Fax: 954-765-4504
www.broward.org/codeappeals
BROWARD COUNTY
BOARD OF RULES AND APPEALS
FBC 6th Edition (2017) FORMAL INTERPRETATION (#5)
DATE: October 12, 2017
TO: All Building Officials
FROM: James DiPietro, Administrative Director
SUBJECT: Retrofit of Windows, Doors, Garage Doors, Shutters and Skylights
FBC Existing Building, Alteration Level I
At its meeting of October 12th, 2017 the Board approved an interpretation of Retrofit of Windows, Doors, Garage Doors, Shutters and Skylights, for detached one and two family dwellings, and multiple single family dwellings, (townhouses) with common roof height < 30 feet.
1. A Florida Professional Engineer or Architect may modify the buck or fasteners as specified in a Notice of Acceptance. Such modification must be documented with a signed and sealed letter or drawing.
2. To obtain the required design pressure for a specific opening at a specific site, an individual must utilize one of the following and submit documentation as indicated.
a) A site-specific plan (signed and sealed) by a Florida Professional Engineer or Architect, indicating the location of all retro openings and the required design pressures.
b) A site-specific plan (not sealed) indicating the location of all retro openings accompanied by a worst case design pressure chart (signed and sealed) prepared by a Florida P.E. or Architect.
c) A site-specific plan (not sealed) indicating the location of all openings and indicating the required design pressures based on the Broward County Fenestration Voluntary Wind Load Chart. (see attached chart).
3. Buildings with a (height) > 30 feet or more shall have a site-specific design (signed and sealed) by a Florida Professional Engineer or Architect, indicating the location of all retro openings and the required design pressures for each opening.
NOTE: Generic charts, graphs alone, etc. are not acceptable for buildings above 30 feet.
ORIGINAL DATE: September 12, 2012
RE-ISSUED: October 12, 2017
EFFECTIVE DATE: January 1, 2018
****PLEASE POST AT YOUR PERMIT COUNTER*****
Page 1 of 2 F.I. #5
C:\Users\mguerasio\Documents\Formal Interpretations\FI-5Retrofit of Windows.Alteration Level 1REV.doc
2017 Voting Members
Chair
Mr. Jeffrey Lucas, FM, CFI, CFEI
Fire Service Professional Vice-Chair
Mr. Kenneth B. Wynn
Representative Disabled Community Mr. John Famularo, Roofing Contractor
Mrs. Shalanda Giles Nelson, General Contractor
Mr. Daniel Lavrich, P.E.
Structural Engineer Mr. Daniel Rourke
Master Plumber Mr.
Gregg D’Attile, Mechanical Contractor
Mr. Stephen E. Bailey, P.E. Electrical Engineer Mr. Ron Burr
Broward County Fenestration Voluntary Wind Load Chart* Per ASCE 7‐10 Method 1, Part 1 and FBC (2017) for Retrofiting in Accordance with Formal Interpretation #5
For Detached One‐and Two family dwellings and Multiple Single‐Family Dwellings (Townhouses) with Mean Roof Height ≤ 30 feet Wind 170 mph (3‐second gust) / Exposure C** / Kd = 0.85 / Kzt = 1.0 / Pressures are in PSF / Not for use in Coastal (Exposure 'D' areas)
* Using Allowable Stress Design methodology (P = 0.6w) / ** Exposure shall be determined according to ASCE 7‐10 Section 26.7.3 (Exposure Categories)
Effective
Wind
Location:
Mean Roof Height of 15 feet
Zone
Mean Roof Height of 20 feet Mean Roof Height of 25 feet Mean Roof Height of 30 feet
Garage Door Wind Loads for a Building with 30‐foot Mean Roof Height
Exposure C
Tables 1609.7(1) & (2), and Section 1609.3.1
Effective Wind Area Roof Angle Wind Load
Width Height + – 8 8 35.2 ‐39.8
0 ‐ 10 10 10 degrees 34.1 ‐38.2
14 14 32.3 ‐36.1 For Effective Wind Areas between those given, values may be interpolated. Otherwise use the value associated with the lower Effective Wind Area.
9 7
16 7
> 10
degrees
38.4 ‐43.4
36.8 ‐41.0
End Zone (a) shall be the smaller of 10% of Least Hor. Dist. or 40% of Mean Roof Height ('h'), but not less than 4% of Least Hor. Dist. or 3 ft.
Identify the zone per the figure or information by others. Any questionable zone is to be considered the more critical zone.
Design is based on the 3‐second gust (wind velocity) for Risk Category II (general residential & commercial construction) per FBC 1620.2 Broward. These tables not for use with essential facilities or assembly occupancies.
Page 2 of 2 Effective Date: January 1, 2018 FBC 6th Edition (2017) Formal Interpretation #5