602.5 Type V

Type V | UpCodes

Type V construction is that type of construction in which the structural elements, <span class="u-italic"><a class="autolink" href="https://up.codes/viewer/illinois/ibc-2021/chapter/2/definitions#exterior_wall">exterior walls</a></span> and interior <a class="autolink" href="https://up.codes/viewer/illinois/ibc-2021/chapter/2/definitions#wall">walls</a> are of any materials permitted by this code.

Assy. 15-1.4: 1hr, Steel

Assy. 15-1.2: 1hr, Wood

Assy. 24-1.1: 1hr, Wood

Assy. 15-1.1: 1hr, Wood

<div>Table 721.1(3) provides a number of prescriptive fire rated assemblies. Roof / floor assembly Item 21-1.1 provides a double layer of gypsum board below a light-framed wood construction floor with wood sheathing over the top. Nailing and other requirements for the floor sheathing and joists shall be as required by Chapter 23. Provisions for installation of the gypsum board ceiling is found in Chapter 25. The assemblies in Section 721 are only prescriptive assemblies for fire ratings. Any requirements having to do with IIC impact sound transmission or STC sound transmission values will need to be cross-referenced from another source. </div><br/> <div>When designing for sound transmission or other changes in the assemblies from the prescribed method, special consideration is required. Section 721.1 states "Where materials that change the capacity for heat dissipation are incorporated into a fire-resistance-rated assembly, fire test results or other substantiating data shall be made available to the building official to show that the required fire-resistance-rating time period is not reduced."</div>

Assy. 21-1.1: 1hr, Wood

Parapets - Exception 5

Assy. 14-1.6: 1hr, Wood

Assy. 14-1.2: 1hr, Wood

Assy. 14-1.1: 1hr, Wood

Assy. 14-1.3: 1hr, Wood

Assy. 14-1.4: 1hr, Wood

Assy. 26-1.1: 1hr, Wood I-Joist

<div>In the course of construction concealed spaces are created that could facilitate the passage of fire. Section 718 defines where and how the free passage of fire through concealed spaces must be slowed or stopped by the use of fireblocking and draftstops. Where horizontal and vertical concealed spaces meet and in relatively small concealed spaces such as in enclosed wall cavities the code calls for continuous fireblocking at various critical intersections and spacings to slow the spread of fire depending on the concealed space condition. In larger concealed spaces such as attics the code calls for draftstopping at specific intervals or spacing to slow the spread of fire. The materials acceptable for use as fireblocking are defined in Section 718.2.1. The materials acceptable for use as draftstopping are defined in Section 718.3.1.</div>

Fireblocking, Draftstopping and Enclosed Space Concepts

<div>Crickets at property lines may be able to be unrated if less than 30" max. height and the roof sheathing for a 4 foot distance on each side is fire-retardant treated.  Check with local jurisdictions for suitability and applicability. </div><br/><div>Source: 2019 Oregon Residential Specialty Code Section R302.2.6.3 - "Unrated cricket less than or equal to 30 inches."</div>

Cricket (Unrated) at Prop. Line

<div>This is but one way to provide a continuous fire rated assembly at a large wood framed cricket when required. </div><br/><div>Source: Oregon Residential Specialty Code Section R302.2.3.1 - "Wood Cricket Greater Than 30" in Height"</div>

Cricket (Rated) at Prop. Line

<div>A fire rating of 1-hour is a common requirement and there are many approved assemblies from Gypsum Association and UL, as well as many proprietary designs. For a proprietary design to be used, the exact products part of the listing must be used to obtain the desired fire rating. Assembly 15-1.3 from Building Code Section 721 is just one of several fire rated assemblies that have been tested for exposure for fire from both sides.  The combustibility requirements of the framing due to the type of construction must also be considered in the selection (for example, metal studs vs. wood studs).  Be aware that metal framing cannot be substituted for wood framing as a 1:1 substitution.  Metal framing has different thermal conductivity  properties and the same rated assembly may have different required materials.</div>

Assy. 15-1.3: 1hr, Wood

Assy. 13-1.1: 1hr Steel Studs

Assy. 13-1.3: 1hr, Steel Studs

<div>Table 721.1(3) provides a number of prescriptive fire rated assemblies. The assemblies in Section 721 are prescriptive assemblies for only fire ratings. Any requirements having to do with IIC impact sound transmission or STC sound transmission values will need to be cross-referenced from another source. </div><br/> <div>When designing for sound transmission or other changes in the assemblies from the prescribed method, special consideration is required. Section 721.1 states "Where materials that change the capacity for heat dissipation are incorporated into a fire-resistance-rated assembly, fire test results or other substantiating data shall be made available to the building official to show that the required fire-resistance-rating time period is not reduced."</div><br/>

Assy. 25-1.1: 1hr, Wood I-Joist

<div>Table 721.1(3) provides a number of prescriptive fire rated assemblies. Roof / floor assembly Item 23-1.1 provides a single layer of gypsum board on steel resilient channels and mineral wool insulation below an engineered I-joist floor with wood sheathing over the top. Nailing and other requirements for the floor sheathing and joists shall be as required by Chapter 23. Provisions for installation of the gypsum board ceiling is found in Chapter 25. The assemblies in Section 721 are only prescriptive assemblies for fire ratings. Any requirements having to do with IIC impact sound transmission or STC sound transmission values will need to be cross-referenced from another source. </div><br/> <div>When designing for sound transmission or other changes in the assemblies from the prescribed method, special consideration is required. Section 721.1 states "Where materials that change the capacity for heat dissipation are incorporated into a fire-resistance-rated assembly, fire test results or other substantiating data shall be made available to the building official to show that the required fire-resistance-rating time period is not reduced."</div><br/><div>Note that the option in the assembly allowing for use of asbestos products is not illustrated here.</div>

Assy. 23-1.1: 1hr, Wood

<div>This is but one way to provide a continuous fire rated assembly at a wood framed roof attic enclosure. </div><br/><div>Source: Oregon Residential Specialty Code Section R302.2.3.1 - "Fire-resistance-rated Roof/Ceiling Construction - "Mushroom" Attic Enclosure Framing Parallel to Common Property Line" </div>

602.5 Type V

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