Let’s begin, your first session, module 1, which will cover chapter 2, definitions and a portion of chapter 3, building planning.

1

This chapter sets forth the definitions of terms used in the 2013 edition of the Residential Code of Ohio. These definitions of terms are used in rules 4101:8-1 through 4101:8-44. As you can see from the next three slides, there are some 43 new definitions, 19 revised definitions and 8 definitions have been deleted from the 2013 RCO.

2

In many cases, the new definitions shown here are the result of new code sections or a significant revision to an existing code.

An example would be HABITABLE ATTIC which means that an attic has sufficient space to be converted into a usable occupiable room, but just importantly, the definition states that such converted space does not have to be counted as a story above grade.

3

Revised definitions add clarity to previous definitions or assist in the administration of code sections through the explanation of terms important to the code. A clear example is that the definitions of BRACED WALL LINE and BRACED WALL PANEL enable a clear understanding of the difference between the PANEL, usually a single unit, and the LINE, normally multiple Panels.

4

Often definitions are deleted because the term is no longer used in code work, such is the case for Confined Space and Unconfined Space, terms that were commonly used in the mechanical codes, but have become obsolete because of requirements in Energy Efficiency. The term Unusually Tight Construction has likewise been deleted because the energy efficiency requirements now cause all dwellings to be sealed, so it is no longer “unusual” for a house to be tight.

5

This chapter regulates the planning and design of dwelling units. Chapter 3 contains most of the nonstructural issues such as location on a lot, fire-reistive construction, light and ventilation, emergency escape and rescue, and design loads.

6

The Wood Frame Construction manual by the American Forest and Paper Association continues to be an acceptable alternative design for wood frame dwelling construction.

7

A similar document to the Wood Frame Construction manual that provides acceptable alternative design and construction requirements for cold-formed steel framing is AISI standard S230. This new standard, which replaces AISI-PM, now applies to 3-story buildings, an increase from 2-stories in cold-formed steel framing.

8

The 2013 RCO now recognizes a recently developed standard for log dwelling construction, ICC-400 by the International Code Council.

9

Table 301.2(1) continues to provide design criteria necessary for applying the appropriate RCO provisions to the design and construction of dwellings under the residential code. Ohio has chosen to fill in some of the data for consistency in design throughout the State. In order to provide more consistency in design throughout Ohio and to make Building Officials, Designers and Builders more aware of essential design requirements, several of the requirements have been predetermined in Table 301.2(1).

10

Table 301.2(1) provides specific information to be used in selecting the appropriate prescriptive code requirements. Some of these criteria have been predetermined.

11

In order to provide further design assistance, a new sub-table provides the Design Temperatures and the number of Heating Degree Days for major population areas of the state as part of Footnote ‘e’ to Table 301.2(1).

12

Among the residential standards established by the Ohio Board of Building Standards in the adoption of the 2013 RCO, is that the Seismic Design Category for Ohio is either an A or a B. This effectively means that there are no seismic provisions required for dwellings constructed under the RCO.

13

Because Ohio is not a High Wind Area, the use of SIP panels are acceptable for all areas of Ohio. Although RCO 2013 includes design criteria for High Wind Areas, it deletes requirements for Hurricane-prone regions and Wind-borne Debris Region, which leaves actual design or construction for high winds as voluntary, not mandated.

14

Structural Insulated Panels have been evaluated and approved as bearing walls able to withstand high winds and support snow loads up to 70 pounds per square foot so long as they are constructed per the approved construction documents.

15

For additional information on SIPs and those construction details, the Structural Insulated Panel Association has provided a video at www.sips.org/media/video.

16

This plan view of a connection between two SIP panels shows the details needed for proper installation of Structural Insulated Panels.

17

To gain their 70 pounds per foot ground snow load-carrying capacity, SIP panel walls must be limited to ten foot wall heights.

18

The use of SIP wall construction is limited to buildings of not more than two stories in height, in addition to the maximum panel height of ten feet. SIP panels can only gain the 70 psf ground snow load carrying capacity when the ten-foot wall height is limited to two stories.

19

The Residential Code of Ohio limits a story to 11 feet, 7 inches total height. The height or thickness of the floor framing system is not limited so long as the allowable story height is not exceeded. Some examples of typical types of wall framing follow on the next slide:

20

Of the examples, please note that the total story height does not exceed 11feet, 7 inches and the SIP panel does not exceed 10 feet.

21

Several of the minimum floor loads established in Table 301.5, have been revised, including a new 20psf load for Attics with Limited Storage. Also please note that Exterior Balconies and Decks are now both designed for a minimum live load of 40psf.

22

In addition to the revisions in some minimum uniform loads, several of the footnotes to Table 301.5 have also been revised including an extensive new footnote ‘g’ dealing with limited attic storage.

23

Limited storage in attics depends upon available space and access to that space.

24

All of the fire resistive requirements of the RCO have been moved into Section 302.

25

Of special note for fire resistive construction is that minimum fire separation distance requirements no longer apply to buildings on the same lot.

A special note for a detached garage within 3 feet of a residence requires ½ inch gypsum board on the interior side of the exterior wall separation see Table 302.6.

26

When a townhouse contains 3 or more dwellings, each group of two dwelling units must have a 2-hour separation wall from the next two dwelling units.

27

Individual dwelling separation walls must have a minimum 1-hour fire resistance rating.

28

Penetrations of fire separation walls, including proper sealing of annular spaces, are now required to be rated construction by new section 302.4.

29

The new section requiring proper fire resistive wall construction including penetrations, contains specific requirements for electrical boxes, including those shown here.

30

New sub-section 302.5.3 requires that annular spaces between dwelling/garage penetrations must have their annular spaces filled with an approved material that can resist the free passage of flame and products of combustion.

31

The annular space material must be approved as able to resist the free passage of flame and products of combustion, but they do not have to meet the ASTM E-136 requirements.

32

The requirements for gypsum board wall and ceiling protection are relocated to the new section on fire resistive construction.

33

The dwelling to garage separation provisions have been relocated to section 302. For clarification, the provisions requiring the application of gypsum board on the garage side of the separation from a dwelling have been placed in a new table.

34

This section allows alternative methods of determining the fire resistance of actual construction.

35

Ceiling height requirements have been reorganized for clarification. Provisions for lower ceiling heights in portions of basements used for utility and storage have been moved to a separate subsection.

36

The ceiling height for a sloped ceiling at plumbing fixtures no longer applies directly over the fixture, so long as it is usable; however the required minimum ceiling height of six feet, eight inches is to be measured in the center of the required 21-inch clearance required in front of all plumbing fixtures.

37

Habitable spaces created in existing basements shall be permitted to have ceiling heights of not less than 6 feet 8 inches. Obstructions may project to within 6 feet, 4 inches of the basement floor.

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