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Section 2330 High-Velocity Hurricane Zones—Wood Blocking
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Wood blocking attachment for lightweight insulating concrete, gypsum concrete, cementitious wood fiber and cellular concrete decks shall be designed by a registered architect or professional engineer. The decks themselves shall not be used as a wood blocking attachment substrate.
In recover applications, wood blocking may be reduced to nominal 1 inch (25 mm), providing the attachment is secured in compliance with this code.
Sound wood blocking may be reused in a recover or reroof application, providing the attachment is secured in compliance with the requirements of this code.
A fastener shall be placed within 3 inches (761 mm) of the end of each section of wood blocking and a 1/4-inch (6 mm) gap shall be left between each section of wood blocking. No piece of wood shall have less than two fasteners.
Fasteners other than nails shall be predrilled prior to attachment and countersunk to be flush with the surface of the wood blocking.
Wood shall be protected according to Section 2326.
Powder actuated fasteners shall not be used in wood blocking attachment.
The fastener's average withdrawal resistance per lineal foot shall be not less than 250 pounds per foot (3649 N/m) after the application of a 4:1 safety factor.
The pullover value of the proposed fastener through the wood blocking shall be not less than 125 percent of the design load of the proposed fastener. If less, a larger bearing washer shall be added to the fastener assembly to meet this requirement. Wood blocking thickness shall be not less than 11/2 inches (38 mm) if a bearing washer is required.
Related Code Sections
Section 2330 Wood, High-Velocity Hurricane Zones—Wood Blocking
Blocking is defined as wood pieces attached to the roof deck or to each other for the purpose of securing roof membrane or accessories ...
Section 2330 Wood, High-Velocity Hurricane Zones— Wood Blocking
Blocking is defined as wood pieces attached to the roof deck or to each other for the purpose of securing roof membrane or accessories ...
Section 2330 Wood, High-Velocity Hurricane Zones— Wood Blocking
Blocking is defined as wood pieces attached to the roof deck or to each other for the purpose of securing roof membrane or accessories ...
2330.1 Wood, General
Blocking is defined as wood pieces attached to the roof deck or to each other for the purpose of securing roof membrane or accessories ...
2014 FBC - Building, 5th edition > 23 Wood > 2330 High-Velocity Hurricane Zones— Wood Blocking > 2330.1 General
2330.1.3 Wood,
Wood blocking attachment for lightweight insulating concrete, gypsum concrete, cementitious wood fiber and cellular concrete decks shall be designed ...
2020 FBC - Building, 7th edition > 23 Wood > 2330 High-Velocity Hurricane Zones—Wood Blocking > 2330.1 General > 2330.1.3