Catalog

Fire Protection of Floors Constructed with I-Joists for Compliance with the International Residential Code

1/2-INCH GYPSUM BOARD ATTACHED TO BOTTOM OF FLANGE

Beginning with the 2012

Floor sheathing

I-joist (max. 24” o.c.)

membrane provisions were

1/2" gypsum board or 5/8" wood structural panel

GYPSUM BOARD PLACED ON TOP OF BOTTOM FLANGE*

* Minimum 1/2" thick gypsum board for joists at 19.2" o.c. or less. Minimum 5/8" thick gypsum board for joists at 24" o.c.

Floor sheathing

I-joist Min. ange size:1-1/8” thick x 2” wide

light-gauge steel framing and less than 2” x 10” nominal dimension lumber and structural composite lumber. R501.3 of the 2012 IRC and Section R302.13 of the 2015 IRC.

5/16” gap max.

Gypsum board* (no connectors or adhesive required)

MINERAL WOOL INSULATION

Floor sheathing I-joist (max. 19.2” o.c.) Min. ‚ange size: 1-1/8” thick x 1-3/4” wide

Mineral wool insulation

1/2-INCH GYPSUM BOARD ATTACHED TO WEB

Floor sheathing

I-joist (max. 24” o.c.)

Min. ange size:1-1/2” thick x 2” wide

1/2" gypsum board

Fastener

1/2-INCH GYPSUM BOARD ATTACHED TO SIDES OF FLANGE

shows prescriptive methods

Floor sheathing

I-joist (max. 24” o.c.)

Min. ange size:1-1/8” thick x 1-3/4” wide

1/2" gypsum board

Fastener

prefabricated wood I-joists, including Roseburg RFPI®- Joists.

FIREBREAK™ PROPRIETARY CERAMIC FIBER BLANKET INSULATION

Floor sheathing

I-joist (max. 24” o.c.)

Min. ange size:1-1/2” thick x 2.3” wide

3/4" Ceramic „ber blanket

Fastener (staple)

STRUCTURAL COMPOSITE LUMBER EXCEPTION In accordance with Exception 4 of the 2012 IRC Section R501.3 and 2015 IRC Section R302.13, †oor assemblies using dimension lumber or SCL equal to or greater than 2 x 10 nominal do not require membrane protection.

limitations regarding I-joists, refer to APA report SR-405D

Floor sheathing

Structural Composite Lumber e.g. Roseburg RigidLam ® LVL

(generic I-joists) and APA report PR-S259 (Roseburg RFPI®-Joists) at www.apawood.org or www.Roseburg.com.

CRAWL SPACE EXCEPTION In accorda nce with Exception 2 of the 2012 IRC Section R501.3 and 2015 IRC Section R302.13, †oor assemblies located directly over a crawl sp ace not intended for storage or fuel-ˆred appl iances do not require membrane protection.

Floor sheathing

I-joist

AUTOMATIC SPRINKLER EXCEPTION In accorda nce with Exception 1 of the 2012 IRC Section R501.3 and 2015 IRC Section R302.13, †oor assemblies located directly over a sp ace protected by an aut omatic sprinkler system do not require membrane protection.

Floor sheathing

I-joist

Automatic sprinkler system

www.roseburg.com

9

January 2025