SECTION 748:20-5-10. IRC® 2015 Chapter 7 Wall Covering

  Chapter 7 of the IRC® 2015 is adopted with the following modifications:

(1)   Section R703.4 Flashing. This section has been modified to clarify that 6-mil polyethylene sheeting is an approved corrosion-resistant flashing in certain circumstances and to clarify flashing above doors are not required where it is unlikely to have rain or othermoisture accumulation occur above the door. This section has been modified to read: R703.4 Flashing. Approved corrosion-resistant flashing shall be applied shingle-fashion in a manner to prevent entry of water into the wall cavity or penetration of water to the building structural framing components. 6-mil polyethylene sheeting is an approved corrosion-resistant flashing when not exposed to UV rays. Self- adhered membranes used as flashing shall comply with AAMA 711. Fluid-applied membranes used as flashings in exterior walls shall comply with AAMA 714. The flashing shall extend to the surface of the exterior wall finish. Approved corrosion-resistant flashings shall be installed at the following locations:

(A)   Exterior window and door openings. Flashing at exterior window and door openings shall extend to the surface of the exterior wall finish or to the water-resistive barrier complying with Section R703.2 for subsequent drainage. Mechanically attached flexible flashings shall comply with AAMA 712. Flashing at exterior window and door openings shall be installed in accordance with one or more of the following:

(i)   The fenestration manufacturer's installation instructions and flashing instructions, or for applications not addressed in the fenestration manufacturer's instructions in accordance with the flashing manufacturer's instructions. Where flashing instructions or details are not provided, flashing to be installed per 1.2, 1.3, 1.4 or, pan flashing shall be installed at the sill of exterior window and door openings. Pan flashing shall be sealed or sloped in a such a manner as to direct water to the surface of the exterior wall finish or to the water-resistive barrier for subsequent drainage. Openings using pan flashing shall incorporate flashing or protection at the head and sides.

(ii)   In accordance with the flashing design or method of a registered design professional.

(iii)   In accordance with other approved methods.

(iv)   Flashing above doors are not required where it is unlikely to have rain or other moisture accumulation occur above the door.

(B)   At the intersection of chimneys or other masonry construction with frame or stucco walls, with projecting lips on both sides under stucco copings.

(C)   Under and at the ends of masonry, wood or metal copings and sills.

(D)   Continuously above all projecting wood trim.

(E)   Where exterior porches, decks, or stairs attach to a wall or floor assembly of wood- frame construction.

(F)   At wall and roof intersections.

(G)   At built-in gutters.

(2)   Figure R703.8 Typical Masonry Veneer Wall Details. This figure has been modified to add footnotes "f" and "g" to the footnote section and amend the figure heading to include a superscript "f" and "g" to indicate the associated footnotes. This figure's footnotes have been modified to read:

(A)   a. See Sections R703.8.5, R703.8.6, and R703.4.

(B)   b. See Section R703.2 and R703.8.4.

(C)   c. See Section R703.8.4.2 and Table R703.8.4.

(D)   d. See Section R703.8.3.

(E)   e. Figure R703.8 illustrates typical construction details for a masonry veneer wall. For the actual mandatory requirements of this code, see the indicated sections of text. Other details of masonry veneer wall construction shall be permitted provided the requirements of the indicated sections of text are met.

(F)   f. Flashing to be done per Section R703.4, in accordance with a design from a registered design professional or in accordance with other approved methods or standard industry practices.

(G)   g. Flashing depicted under sill and above windows are not required with windows that have nailing flanges for their primary attachment. Flange type windows should be counter flashed into the weather resistant barrier or installed per Section R703.4.

(3)   Figure R703.8.2.1 Exterior Masonry Veneer Support by Steel Angles. This figure has been modified to add a footnote "a" to the figure heading with a superscript "a" to indicate an associate footnote. Footnote "a" has been added to read: a. Flashing to be done per Section R703.4, in accordance with a design from a registered design professional or in accordance with other approved methods or standard industry practices.

(4)   Figure R703.8.2.2 Exterior Masonry Veneer Support by Roof Members. This figure has been modified to add a footnote "a" to the figure heading with a superscript "a" to indicate an associate footnote.. Footnote "a" has been added to read: a. Flashing to be done per Section R703.4, in accordance with a design from a registered design professional or in accordance with other approved methods or standard industry practices.

(5)   Section R703.8.3.1 Allowable span. This section has been modified to provide guidance to builders using a typical for Oklahoma lintel. This section has been modified to read: R703.8.3.1 Allowable span. The allowable span shall not exceed the values set forth in Table R703.8.3.1. Additionally a 3 inches x 3 inches x 3/16 inch (76 mm x 76 mm x 4.8 mm) steel angle 6 feet (1829 mm) long may be used to support 3 vertical feet (914 mm) of masonry veneer and a 3 inches x 3 inches x 3/16 inch (76 mm x 76 mm 4.8 mm) steel angle 5 feet (1524 mm) long may be used to support 4 1/4 vertical feet (1295 mm) of masonry veneer.

[Source: Added at 28 Ok Reg 2122, eff 7-15-11; Amended at 33 Ok Reg 1852, eff 11-1-16]