Texas Department of Insurance Adopted 2018 I-Codes Adopted Codes - - PowerPoint PPT Presentation

Texas Department

• f Insurance

Adopted 2018 I-Codes

Adopted Codes

2018

International Residential Code International Building Code

Without Texas Revisions

2018 International Residential Code

Figure R301.2(4)A Ultimate Design Wind Speeds

2018 International Residential Code – Figure R301.2(5)A

2018 International Residential Code

Wind Zones

• Inland II
• Inland I
• Seaward

Will not be used to determine Wind Speeds

Wind speeds will be determined by the maps in the I-Codes

Figure R301.2(4)A Ultimate Design Wind Speeds

2018 International Residential Code

R301.2.1 Wind design criteria

Cladding and components require “design load performance” Items such as:

Wall coverings Curtain walls Roof coverings Exterior windows Skylights Garage doors Exterior doors Visit: https://tdi.texas.wind/prod/index.html

2018 International Residential Code

R301.2.1.1 Wind limitations and wind design required in accordance with Figure R301.2(5)B

• AWC Wood Frame Construction Manual (WFCM)
• ICC Standard for Residential Construction in High-Wind

Regions (ICC 600)

• ASCE 7 Minimum Design Loads for Buildings and Other

Structures

• AISI Standard for Cold-Formed Steel Framing (AISI S230)
• International Building Code

The design of building for wind loads shall be in accordance with one or more of the following:

2018 International Residential Code

Figure R301.2(4)B Wind Design is Required

2018 International Residential Code – Figure R301.2(5)B

2018 International Residential Code – Design Pressure Factors

Wind Speeds

2018 International Residential Code – Figure R301.2(5)A

2018 International Building Code

Table 1604.5 – Risk Category of Building and other Structures

Risk Category Nature of Occupancy I Low hazard to human life in the event of failure II Other structures not listed in Risk Categories I, III, or IV III Substantial hazard to human life in the event of failure IV Essential facilities

2018 International Residental Code

R301.2.1 – Wind Design Criteria Where not otherwise specified, the wind loads listed in Table R301.2(2) adjusted for height and exposure using Table R301.2(3) shall be used to determine design load performance

2018 International Residential Code

Mean Roof Height and Building Exposure Adjustment Coefficients

Mean Roof Height Building Exposure B C D 15 0.82 1.21 1.47 20 0.89 1.29 1.55 30 1.00 1.40 1.66 35 1.05 1.45 1.70 40 1.09 1.49 1.74 45 1.12 1.53 1.78 50 1.16 1.56 1.81 55 1.19 1.59 1.84 60 1.22 1.62 1.87

2018 International Residential Code

R301.2.1.4 Exposure B Category “Urban and suburban areas, wooded areas or other terrain with numerous closely spaced

• bstructions having the size of

single-family dwellings or larger. Exposure B shall be assumed unless the site meets the definition

• f another type exposure.”

2018 International Residential Code

R301.2.1.4 Exposure C Category

“Open terrain with scattered obstructions, including surface undulations or other irregularities, having heights generally less than 30 feet (9144 mm) extending more than 1,500 feet (457 m) from the building site in any quadrant. This exposure shall apply to any building located within Exposure B type terrain where the building is directly adjacent to open areas of Exposure C type terrain in any quadrant for a distance of more than 600 feet (183 m). This category includes flat, open country and grasslands.”

2018 International Residential Code

R301.2.1.4 Exposure D Category

“Flat, unobstructed areas exposed to wind flowing over open water, smooth mud flats, salt flats and unbroken ice for a distance of not less than 5,000 feet (1524 m) This exposure shall apply only to those buildings and other structures exposed to the wind coming from over the unobstructed area. Exposure D extends downwind from the edge

• f the unobstructed area a distance of 600

feet (183 m) or 20 times the height of the building or structure, whichever is greater.”

2018 International Residential Code – Product Evaluations

TDI does not approve or endorse the use of any product manufacturer or building product

To search for tested products, visit: https://tdi.texas.wind/prod/index.html

The Department recognizes other recognized entities, such as: International Code Council (ICC) Miami-Dade County Factory Mutual

2018 International Residential Code – Windows & Doors

R609.2 Performance Exterior windows and doors

• Must be designed to resist wind loads adjusted for height and

exposure; or

• By ASCE 7 using allowable stress design load combinations of

ASCE 7

2018 International Residential Code

R609.2 Performance

• Exterior windows and doors tested per AAMA/WDMA/CSA

101/I.S.2/A440 – 17, or AMD 100

• 1. Required Design Pressures determined from ASCE 7

using the ultimate strength design may be multiplied by 0.6

2018 International Residential Code

R609.3 Testing and labeling Exterior windows and sliding glass doors

• 1. AAMA/WDMA/CSA 101/I.S.2/A440 – 17

Exterior side-hinged doors

• 1. AAMA/WDMA/CSA 101/I.S.2/A440 – 17, or

AMD 100

Design Pressures using ASCE 7-16

Design Wind Pressure Requirements for Windows, Exterior Doors and Impact Protective Systems (Shutters)

120 mph 130 mph 140 mph 150 mph 160 mph 170 mph

+14.8 / -19.4 +17.4 / -22.8 +20.2 / -26.4 +23.2 / -30.3 +26.6 / -34.5 +29.8 / -38.9

Based on MRH of 30 Feet and Exposure B conditions Corner Zones

2018 International Residential Code – Protection of Openings

R301.2.1.2 Protection of Openings Exterior glazing in buildings located in windborne debris regions shall be protected from windborne debris. Glazed

• pening protection for windborne debris shall meet the

requirements of the Large Missile Test of ASTM E1996 and ASTM E1886 as modified in Section 301.2.1.2.1 Garage door glazed opening protection for windborne debris shall meet the requirements of an approved impact-resisting standard or ANSI/DASMA 115

2018 International Residential Code

R301.2.1.2 Protection of Openings Permits glazed openings in hurricane-prone regions to be protected with 7/16” Wood Structural Panels

• Required in areas where the ultimate design wind

speed, Vult, is 140mph or greater

• Requires corrosion-resistant fasteners
• Fasteners are required to be permanently attached

to building

2018 International Residential Code

Figure R301.2(4)A Ultimate Design Wind Speeds

2018 International Residential Code – Figure R301.2(5)A

2018 International Residential Code

Permits glazed openings to be protected with 7/16” Wood Structural Panels

Fastener Type Fastener Spacing (inches) Panel span < 4 feet 4 feet < panel span < 6 feet 6 feet < panel span < 8 feet

• No. 8 wood screw based

anchor with 2-inch embedment length 16 10 8

• No. 10 wood screw based

anchor with 2-inch embedment length 16 12 9 ¼-Inch lag based anchor with 2-inch embedment length 16 16 16

Table R301.2.1.2 Protection of Openings

2018 International Residential Code – Roof Coverings

Table R905.1.1(1) Underlayment Types

Roof Covering Section Maximum Ultimate Design Wind Speed, Vult < 140mph Maximum Ultimate Design Wind Speed, Vult > 140mph Asphalt Shingles

R905.2 ASTM D 226 Type I ASTM D 4869 Type I, II, III, or IV ASTM D 6757 ASTM D 226 Type II ASTM D 4869 Type IV ASTM D 6757

Clay and concrete tile

R905.3 ASTM D 226 Type II ASTM D 2626 Type I ASTM D 6380 Class M mineral surfaced roll roofing ASTM D 226 Type II ASTM D 2626 Type I ASTM D 6380 Class M mineral surfaced roll roofing

Metal roof shingles

R905.4 ASTM D 226 Type I or II ASTM D 4869 Type I, II, III, or IV ASTM D 226 Type II ASTM D 4869 Type IV

Mineral-surfaced roll roofing

R905.5 ASTM D 226 Type I or II ASTM D 4869 Type I, II, III, or IV ASTM D 226 Type II ASTM D 4869 Type IV

Slate and slate-type shingles

R905.6 ASTM D 226 Type I or II ASTM D 4869 Type I, II, III, or IV ASTM D 226 Type II ASTM D 4869 Type IV

Wood shingles

R905.7 ASTM D 226 Type I or II ASTM D 4869 Type I, II, III, or IV ASTM D 226 Type II ASTM D 4869 Type IV

Wood shakes

R905.8 ASTM D 226 Type I or II ASTM D 4869 Type I, II, III, or IV ASTM D 226 Type II ASTM D 4869 Type IV

Metal panels

R905.10 Manufacturer’s instructions ASTM D 226 Type II ASTM D 4869 Type IV

2018 International Residential Code

Table R905.1.1(1) Underlayment Types Underlayment is required to bear a label indicating compliance to the Standard designation (ASTM D#) and the Type Classification

ASTM D226, Type II ASTM D4869, Type III or IV ASTM D6757 ASTM D1970

Synthetic Underlayments are not specifically addressed in the 2018 IRC

Hold unto the underlayment wrappers for the inspector

2018 International Residential Code

Table R905.1.1(2) Underlayment Application

Roof Covering (Type) Maximum Ultimate Design Wind Speed, Vult <140 mph Maximum Ultimate Design Wind Speed, Vult >140 mph Asphalt Shingles 2:12 to 4:12 – “Underlayment shall be two layers applied in the following manner: apply a 19-inch strip of underlayment felt parallel to and starting at eaves. Starting at the eave, apply 36-inchwide sheets of underlayment, overlapping successive sheets 19 inches.” Same as Maximum Ultimate Design Wind Speed, Vult <140 mph except all laps must be a minimum of 4 inches 4:12 and greater – “Underlayment shall be one layer applied in the following manner: Underlayment shall be applied shingle fashion, parallel to and starting from the eave and lapped 2 inches” Distortions in the underlayment shall not interfere with the ability of the shingles to seal. End laps shall be 4 inches and shall be offset by 6 feet.

Please check Table R905.1.1(2) for underlayment applications for additional roof covering types

2018 International Residential Code

Table R905.1.1(3) Underlayment Application

Roof Covering (Type) Maximum Ultimate Design Wind Speed, Vult <140 mph Maximum Ultimate Design Wind Speed, Vult >140 mph Asphalt Shingles Fasten sufficiently to hold in place Attach “with corrosion-resistant fasteners in a grid pattern of 12 inches between laps with a 6-inch spacing at side laps” Attach with “metal or plastic cap nails or cap staples with a nominal cap diameter of not less than 1 inch. Metal caps shall have a thickness of not less than 32-gage sheet metal. Power- driven metal caps shall have a minimum thickness of 0.010

• inch. Minimum thickness of the outside edge of plastic caps

shall be 0.035 inch. The cap nail shall be not less than 0.083 inch for ring shank cap nails and 0.091 inch for smooth shank cap nails. Cap nail shank and cap staple legs shall have a length to penetrate the roof sheathing or not less than ¾ inch into the roof sheathing.”

Please check Table R905.1.1(2) for underlayment applications for additional roof covering types

2018 International Residential Code

Table R905.2.4.1 Classification of Asphalt Roof Shingles

Maximum Ultimate Design Wind Speed, Vult From Figure R301.2(4)A (mph) Maximum Ultimate Design Wind Speed, Vasd From Table R301.2.1.3 (mph) ASTM D 7158 Shingle Classification ASTM D 3161 Shingle Classification

110 – 129 85 – 100 G or H A, D, or F 142 – 155 110 – 120 G or H F 168 – 194 130 – 150 H F Hold unto the shingle wrappers for the inspector

2018 International Residential Code

Table R905.2.5 Fasteners for Asphalt Roof Shingles

• Galvanized steel
• Stainless steel
• Aluminum
• Copper

Fasteners must be:

• 12-Gage shank
• 3/8-Inch diameter head
• 3/4” Decking penetration
• Complying with ASTM

F1667 Fasteners must be a minimum of:

2018 International Residential Code

Table R905.2.6 Attachment of Asphalt Roof Shingles

• Shingles shall have the minimum number of fasteners required by

manufacturer’s approved installation instructions

• Shingles shall not have less than four fasteners per strip shingle or

two fasteners per individual shingle

• Shingles on slopes greater than

21:12 shall be installed in accordance with the manufacturer’s approved installation instructions

2018 International Residential Code

R905.2.8.2 Valleys Valley linings:

• 1. Open valleys (Metal)
• Refer to Table R905.2.8.2
• 2. Open valleys
• Two-Ply mineral surface roll-roofing complying with ASTM D3909
• r ASTM D6380, Class M
• 3. Closed valleys
• One-ply mineral surface roll-roofing complying with ASTM D6380
• r other valley linings described in bullet 1 and 2
• Self-adhered polymer-mod. bit. complying with ASTM D1970

2018 International Residential Code

Table R905.2.8.2 Valley Lining Material

Material Minimum Thickness (inches) Gage Weight (pounds) Cold-rolled copper 0.0216 nominal – ASTM B370 16 ounces per square foot Lead-coated copper 0.0216 nominal – ASTM B101 16 ounces per square foot High-yield copper 0.0162 nominal – ASTM B370 12 ounces per square foot Lead-coated high-yield copper 0.0162 nominal – ASTM B101 12 ounces per square foot Aluminum 0.024 – – Stainless steel – 28 – Galvanized steel 0.0179 26 (zinc coated G90) – Zinc alloy 0.027 – – Lead – – 2 ½ Painted terne – – 20

2018 International Residential Code

R905.2.8.3 Sidewall flashing

• Required to be continuous or step flashing
• Must be a minimum of 4 inches high and 4 inches wide
• The vertical leg of continuous flashing is required to be

installed under siding

• For masonry veneer, flashing is required as per R703.8.2.2
• For exterior plaster or adhered masonry veneer, flashing is

required as per R703.6.3

2018 International Residential Code

R905.2.8.5 Drip edge

• Must be provided at the eaves and rake edges
• Must lap adjacent pieces at least 2 inches
• Must extend at least ¼ inches below roof sheathing and at least

2 inches onto roof sheathing

• Must be fastened a maximum of 12 inches on center
• Must be applied under the underlayment at the eaves and over

the underlayment on the rake edges

Design Pressures using ASCE 7-16

Design Wind Pressure Requirements for Mechanically Attached Roof Covering Materials

Roof Slope 120 mph 130 mph 140 mph 150 mph 160 mph 170 mph >0 ͦ to 7 ͦ +10.0 / -44.5 +10.0 / -52.3 +10.0 / -60.6 +10.0 / -69.5 +11.2 / -79.14 +12.7 / -89.3 >7 ͦ to 20 ͦ +10.0 / -49.8 +11.0 / -58.4 +12.8 / -67.7 +14.7 / -77.8 +14.7 / -88.5 +18.9 / -99.9 >20 ͦ to 27 ͦ +10.0 / -45.5 +11.0 / -53.4 +12.8 / -61.9 +14.7 / -71.1 +16.7 / -80.9 +18.9 / -91.3 >27 ͦ to 45 ͦ +14.2 / -35.9 +16.7 / -42.2 +19.4 / -49.0 +22.2 / -56.2 +25.3 / -63.9 +28.6 / -72.2

Based on MRH of 30 Feet and Exposure B conditions Perimeter Zones

2018 International Residential Code

R908.3 Roof replacement

• Roof replacement shall include the removal of existing

layers of roof coverings down to the roof deck (no felt, shingles, insulation or built-up roof)

• One existing layer of ice barrier, adhered to the deck,

may be left in place with an additional layer of ice barrier installed

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For more information or for answers to general questions:

Contact TDI Engineering at (800)248-6032, Option 5