Type B Roofing Requirements

Minimum requirements for roof assemblies are found in chapter 15 of the ibc chapter 9 of the irc and chapter 7 of the iebc.

Type b roofing requirements. Type b roof deck is 1 5 deep. Most building codes will not accommodate any type of unrated roofing material. The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process. Class b roof assemblies and roof coverings shall be listed and identified as class b by an approved testing agency.

When ratings above 1 90 are required the contract documents must specify special requirements in accordance with fm data sheet 1 29 section 2 2 13. The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures. Type b roof deck is fm approved for use as a component in classes 1 60 1 75 and 1 90 wind uplift construction. Understanding the fire rating for your roofing materials will help you determine how safe your home is in the event of a fire.

Also known as wide rib this structural metal roof deck provides a support surface for various types of roofing materials. This month let s take a closer look at one particular type fire ratings. Code interpretation this code implies that all roof materials that pass the testing provided in the astm e 108 fire testing under the moderate category. Minimum roof covering classification for type of construction prescribes a minimum fire classification for a building s roof assem bly based on the building s construction classification type.

Fire ratings may pertain to resistance to fire from above the roof system the familiar class a b or c ratings or fire exposure from the building interior the underside of the roof deck. Types b bi and b dek are icc fm and ul approved. Roofing systems must meet or exceed building codes and insurance requirements. Fire resistance classification requirements are based on the type of construction and the building use group.

Minimum class c roof. In a recent roofing column we focused upon technical information that could be found on roofing material wrappers that could verify compliance with various building codes. Class a does not mean grade a roofing systems are rated by realistic fire tests. 1 5 b deck s wider rib profile allows for more insulation to be installed.

Table 1505 1 requires minimum class b roof coverings for types ia ib iia iiia iv and va buildings.