Partially Enclosed Building Defined

Partially Enclosed

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See Also ASCE 7

enclosed building defined

open building defined

Partially Enclosed Building Defined:

A building that complies with both of the following conditions: 1. the total area of openings in a wall that receives positive external pressure exceeds the sum of the areas of openings in the balance of the building envelope (walls and roof) by more than lo%, AND

2. the total area of openings in a wall that receives positive external pressure exceeds 4 ft2 (0.37 m2) or 1% of the area of that wall, whichever is smaller, and the percentage of openings in the balance of the building envelope does not exceed 20%

IF THIS IS NOT TRUE, AN ENCLOSURE BY DEFINITION IS NOT PARTIALLY ENCLOSED.

On occasion, building officials will assume a building originally designed as enclosed to be partially enclosed if storm shutters are not provided, which is a conservative worst-case aproach, but is defendable by the fact that there is no written code provision for this and the structure won't meet the above definition. Also, everything needs to be designed for partially enclosed, roof, connections, walls, foundation, beams, columns, etc. A building won't stand if only 1 part of it is designed as partially enclosed and not the rest.

ASCE 7-05 and Partially Enclosed

Post from Joe Belcher 1-6-05 regarding ASCE 7-05, partially enclosed, and the 2004 Florida building Code:

I looked into the current set of proposed modifications to the FBC and Florida Statute and it appears the earliest we will see the adoption of ASCE 7-05 is July, 2007. That is the currently scheduled implementation date of the next update of the FBC and I believe it is optimistic.

I looked at the proposed mods for the glitch amendment cycle and did not see one updating to ASCE 7-2005. There are 640 plus proposed mods and I may have missed it, but, I do not think so. In addition, someone could submit a public comment by January 15, 2006, requesting the update.

Whether or not the Commission has the authority to make the update to ASCE 7-2005 is questionable due to language in Florida Law. Ch. 2005-141, Laws of Florida, Section 36. (Formerly known as Senate Bill 442) Notwithstanding subsection (3) of section 109, chapter 2000-141, Laws of Florida, when the Florida Building Commission updates the Florida Building Code, the commission shall adopt, pursuant to section 553.73, Florida Statutes, as wind protection requirements for areas of the state not within the high velocity hurricane zone, the most current edition of the wind protection requirements of the American Society of Civil Engineers, Standard 7, as implemented by the International Building Code.

This section is intended to explicitly supersede only the first sentence of subsection (3) of section 109, chapter 2000-141, Laws of Florida. (Emphasis provided.) Ch. 2005-141, Laws of Florida, Section 37. Notwithstanding any other provision of this act, the option for designing for internal pressure for buildings within the windborne debris region shall be repealed immediately upon adoption of standards and conditions within the International Building Code or International Residential Code prohibiting such design option.

The Florida Building Commission shall initiate rulemaking to incorporate such standards and conditions prohibiting designing for internal pressure for buildings into the Florida Building Code when the base code is updated. I do not intend to argue whether or not the authority to update prior to updating the code is there, as it is an issue of law, but, I do not believe the authority to adopt editions outside the adopted base code is granted by law. For completeness, I am including Section 109, Ch. 2000-141, LOF, below. Ch. 2005-141 also directed the Commission to study the Panhandle Exception for wind borne debris and make recommendations to the legislature for the upcoming session. Finally, while not directly related to your question, another matter of interest has been the demise of the partially enclosed option for designing within the wind borne debris region.

Please note the provisions requiring jurisdictions to accept "increased internal pressure" (partially enclosed design) were amended to reflect that when the option is removed from the base code, it will be removed from law. (See Ch. 2005-141, Laws of Florida. Section 37 above.)

The option for partially enclosed design in wind borne debris regions has been removed from the IRC in the 2004 Supplements and will not be included in the IRC 2006 which is scheduled to become the base for the FBCR in 2007. I am not certain if similar action was taken in the IBC. Ch. 2000-141, LOF Section 109(3) For areas of the state not within the high velocity hurricane zone, the commission shall adopt, pursuant to s. 553.73, Florida Statutes, the wind protection requirements of the American Society of Civil Engineers, Standard 7, 1998 edition as implemented by the International Building Code, 2000 edition, and as modified by the commission in its February 15, 2000, adoption of the Florida Building Code for rule adoption by reference in Rule 9B-3.047, Florida Administrative Code.

However, from the eastern border of Franklin County to the Florida-Alabama line, only land within 1 mile of the coast shall be subject to the windborne-debris requirements adopted by the commission. The exact location of wind speed lines shall be established by local ordinance, using recognized physical landmarks such as major roads, canals, rivers, and lake shores, wherever possible. Buildings constructed in the windborne debris region must be either designed for internal pressures that may result inside a building when a window or door is broken or a hole is created in its walls or roof by large debris, or be designed with protected openings.

Except in the high velocity hurricane zone, local governments may not prohibit the option of designing buildings to resist internal pressures. I hope the above helps in your deliberations and feel free to call on me if you wish to discuss the above or any other matter.

Thank you, Joe Belcher JDB Code Services, Inc. 41 Oak Village Blvd. Homosassa, FL 34446 352-382-3873 352-382-4716 Fax




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Last Updated
22nd of July, 2009

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