Chapter 4 Foundations

Transcription

1 2008 Oregon Residential Specialty Code Changes Effective April 1, 2008 (Except, a grace period exists until June 30, 2008 where either the existing or the new code may be uses. But, the two can not be mixed.) The Electrical and Plumbing provisions are no longer in the Oregon Residential Specialty Code. Appendix O, Row Houses, no longer exists. Appendix N, Low-rise Multiple Family structures is no longer in the residential code. Provisions are in the Structural Code. Chapter 1 - Administration R105.2 Work exempt from permit. #1 Non-habitable, added used as tool and storage sheds, playhouses and similar uses,....#5 added platforms, removed 30 inch rule. R106.1 Submittal Documents. Statement of special inspections required. R109.1 General. Work to remain accessible and exposed until approved. R Reinforced masonry, insulating concrete form (ICF) and conventionally formed concrete wall inspection. R110.1 Certificate of Occupancy required. Shall include names of contractors among other items. (C of O required as of April 1 regardless of code used.) R Moisture Content. After framing and prior to installation of interior finishes, the Building Official shall be notified in writing by the general contractor that all moisture-sensitive wood framing members have a moisture content of not greater than 19% of the weight of dry wood. Chapter 3 Building Planning Several new definitions have been added. R NEW Seismic Zone E. (Oregon doesn t have any E categories) Table R301.5 Uniformly Distributed Loads. Sleeping Rooms are now allowed to be designed for 30 psf. R302 Exterior Wall Location (Fire separation distances) Section is completely rewritten. See tables. R303.1 Habitable Rooms. Added #3. Use of sunrooms.... R Light Activation. shall be a wall switch at each floor level where the stairway has six or more risers. R308.1 Identification (safety glazing) a label is now allowed in lieu of etching, embossing, etc. R Other Penetrations. Penetrations through the garage separation must be filled by an approved material to resist passage of flame and gas. R309.2 Separation Required. New language allows detached garages less than 3 feet from dwelling when protected w/ ½ gypsum wall board on the inside of the garage. R310.1 Emergency Escape and Rescue Openings. R Minimum opening height. net clear opening height shall be 24 inches (610mm).

2 R310.5 Emergency escape windows under decks, porches and similar projections. Now allowed when a 36 inch high path is maintained. R Landings at doors. Allowed slope 2%. Exception: #1 change from two to three or fewer risers. R Maximum slope (Ramps). Changed to 1:12 (8.3%) slope with an exception for 1:8 (12.5%) where infeasible. SECTION R317 Dwelling Unit Separation.. Most of this is new under Townhouse. Looks as if they moved the a lot of the Rowhouse information to here. R317.1 Two-family dwellings. New exception for fire separation wall allowing attic draft stop when ceilings are 5/8 Type-X gypsum wall board. R318.2 Moisture Content. After framing and prior to installation of interior finishes, the Building Official shall be notified in writing by the general contractor that all moisture-sensitive wood framing members have a moisture content of not greater than 19% of the weight of dry wood. R319.1 Location Required (Protection against decay) treated in accordance with AWPA U1..shall be listed in Section 4 of AWPA U1. R Field cuts treated in accordance with AWPA M4. R319.1 Protection Against Decay. Item 2 now includes all sill plates in contact with concrete or masonry foundation walls. R Exposed glue-lam timbers. Pressure Treated or decay resistant wood. R319.3 Fasteners. Coating requirements for zinc-coated. NEW SECTION R323 ELEVATORS AND PLATFORM LIFTS. Section R323 Flood-Resistant Construction is now Section R324. R Elevation requirements. Elevations minimum of 1 foot above... ADD #4. Chapter 4 Foundations R Drainage- Impervious surfaces within 10 ft., 2 % slope away from the building. R Wood treatment retention level has been removed. Now refers to AWPA U1. Table R403.1 All minimum footing sizes are 12. R Seismic reinforcing- footings w/ stem walls, (1) #4 within 3to 4 inches of the bottom of the footing. R Frost protection- protection not required for freestanding accessory structures 600 sq, ft. or less for light framed construction. R Foundation anchorage- walls 24 or shorter require (1) ½ inch anchor bolt, walls 12 and shorter require no foundation anchorage. R Foundation anchorage in Seismic Design Categories C, D 1 -and D 2. 3 x 3 x.229 plate washers shall be required for all braced wall lines (ext. walls). R Seismic Design Categories D1 and D2. Item 6: Vertical reinforcement of one #3 max 4 feet on center. Tied to horizontal in footings. Deleted paragraph of Vertical reinforcement added more information and new Tables. TABLE R (2) Lots of new information added, as well as Table R (3); Table R (4); and Table R (5).

3 R Retaining walls- walls that are not laterally supported at the top and retain in excess of 48 of unbalanced back fill shall be designed Chapter 5 Floors NEW R Structural log members. NEW R Framing at braced wall lines. Load path for lateral forces. Table R (1) New footnote a. Dead load limits for townhouses. Same for Table (2) New footnote b. (same as above) Table R502.5(1) New column for ground snow load of 70 psf Table R (1) New column for Allowable live load. NEW R Floor trusses. For cold-formed steel trusses. R505.2 Structural framing. Hole in joist webs conditions: 6 New conditions. Figure R505.2(3) Has been slightly modified. R Allowable joist spans. ADDED Blocking. R Hole patching. New Re-written. NEW R Reinforcement support. Chapter 6 Wall Construction Table R602.3(2) Alternate Attachment table has been modified R602.3 Design and construction. Exterior walls...studs shall be continuous from a support at the bottom to a support at the top to resist loads perpendicular to wall. The support shall be a foundation or floor, ceiling or roof diaphragm or shall be designed in accordance with accepted engineering practice or other methods approved by the Building Official. R602.6 Drilling and notching-studs 2. Drilling change from 40 % to 60% of stud width.....drilled over 40 % up to 60% shall also be doubled with not more than 2 successive double studs bored. R602.8 Fireblocking required. Item 4 now includes around cables and wires. R Arrangement has been changed. New R Alternate braced wall panel adjacent to a door or window opening. Figure R R Connections. This section has been greatly added to. It now includes R Sole plate connections. R Foundation sill plate connections. R Top plate connections. Provides prescriptive details to connect cantilevered or stub heel trusses to braced wall line. R Bracing in Seismic Design Categories C, D1, and D2 has been divided into 3 sections; R Braced wall line spacing. R Braced wall panel location. And R Collectors. (NEW) Renumbered from R to R Two or less horizontally attached units. R renumbered from R Three or more horizontally attached units. No tie-down device for a one-story or top of two or three story.

4 New R Wall anchorage. Plate washers minimum 3x3 inches. Hole requirements. No exceptions. Per IRC model code Few changes to Sections R603 through R612, model code changes. Steel wall framing, masonry construction and the use of ICF blocks. Chapter 7 Wall Covering New section from IRC model code. R Horizontal gypsum board diaphragm ceilings. R Water-resistant gypsum backing board. R Limitations. Table R R renamed to Cement, fiber-cement and glass mat gypsum backers. Gypsum backer has been completely deleted. R703.1 General. Has been added to and all Exceptions from the IRC model code. Exception 1. weather-resistant changed to water-resistant. R703.2 changed to Water-resistive barrier. One layer of No. 15 asphalt felt. Has been added to and exceptions has changed. R703.4 Attachments. Added information for basic wind speed of 110 mph or higher. Table R703.4 Weather-Resistant Siding Attachment. Several of the siding materials has been added to column where water-resistive barrier is required. New Section per IRC model code R Water-resistive barriers. R703.7 Stone and masonry veneer, general. Conditions have been removed. Exceptions added; See IRC model code. OREGON has added Exception 3. IRC Model Code. New Table 703.7(1) and Table 703.7(2). New Figure R703.7(1). R703.8 Flashing. Slight changes in wording. 1. has been completely replaced. NEW R Vinyl siding. R Installation. Per IRC model code. Chapter 8 Roof-Ceiling Construction NEW section R Structural log members. R802.2 Design and construction. Added minimum slope 3:12 (25%). R Ceiling joist and rafter connections. Removed Table R602.3(1). Second and Third paragraphs have been deleted and replaced Per IRC model code. Rafter ties min. 2x4 in. Table R802.5(1) thru R802.4(2), the Rafter Span Adjustment Factor numbers in footnote has changed. NEW section R Applicability limits. Per IRC Model Code. R Bracing. Added BCSI SECTION R804 STEEL ROOF FRAMING R Roof trusses. Truss members shall not be notched, cut....without approved design. R Applicability Limits. Rafter or truss span Change from 36 to 40 feet in width. Height limitation deleted. R804.2 Structural framing. Condition 4 & 5 added. R Material. Number 4 changed. Figure R804.2(3) Minor changes.

5 Tables R (1) thru R (8) are new tables. R Hole patching. Now as per IRC Model Code. Tables R (1) and R Have been modified. NEW R806.4 Unvented attic assemblies. Oregon has added verbage. Chapter 9 Roof Assemblies NEW R903.5 Hail exposure. R Moderate hail exposure. R Severe hail exposure. Per IRC Model Code. NEW R Wind resistance of asphalt shingles. Per IRC Model Code. R Attachment. Class F added. NEW R Ice barrier. Reworded. Changed R Material standards. Per IRC Model Code. NEW R Ice barrier. NEW R Ice barrier Changed R Underlayment. NEW R Ice barrier. Changed R Underlayment. NEW R Ice barrier. Table R minor change. R Slope. Re-arranged. R Material standards. Per IRC Model Code. TWO NEW TABLES R (1) and R (2) Per IRC Model Code. NEW R906.2 Material standards. And Table R906.2 Per IRC Model Code. R907.3 Re-covering versus replacement. ADD condition 4 and Exception 3 all reads per IRC Model Code. Chapter 10 Chimneys and Fireplaces THIS CHAPTER HAS BEEN REARRANGED DELETE R Mantel and trim. R1006 has been changed to SECTION R1002 MASONRY HEATERS. This seems to follow IRC Model Code as well as SECTION R1003 MASONRY CHIMNEYS. Changed from R1001 Table R (1) changed to Table R (1). Table R (2) changed to Table R (2) This table is completely different. R Chimney fireblocking..... beams or headers shall be self-supporting or.... SECTION R1005 FACTORY-BUILT CHIMNEYS was R1002. Changes follow IRC Model Code. SECTION R1006 EXTERIOR AIR SUPPLY was R1005 Chapter 11 Energy Efficiency (OREGON ONLY) R Change of occupancy or use. This section more specific.

6 NEW Section N Change of use. And Section N Change of occupancy. Both refers to Table N1104.1(2) Footnote d. N Additions. Exception ADDED. 30% of existing building heated space floor are or 400 square feet, not required to comply with Table (2). NEW Table N1101.1(1). Standard Base Case and Log Homes Only. NEW Table N1101.1(2) Additional Measures (select one) in addition to Table N1101.1(1). N General. Reworded to use new Tables. ADDED to incorporate passive solar elements. Table N1104.1(1) Rearranged. ADDED two footnotes about skylights & Exterior door. N Windows. ADDED Requirement #3. NEW N Intermediate framing for walls. 1. Walls. 2. Corners and intersections. 3. Headers. NEW N Slab-on-grade floors with hydronic heat. N CHANGED TO Vapor retarders. Numbers 1, 2 & 3 have been removed. Exceptions remain with one added Below grade walls are not required to have a vapor retarder. N Insulation of ducts. ADDED Exception: existing ducts not required to be insulated to current code. NEW N Outdoor thermostat required. N Heat pumps. More specific and HSPF not less 7.7 and SEER 13. NEW N Air conditioners. NEW N Furnaces. N Oil-fired furnaces. N Gas-fired furnaces. NEW N Boilers. N Packaged terminal air conditioners. N Packaged terminal heat pumps. Same table NEW number. Was Table N ; NEW number Table N NEW SECTION ADDED. SECTION N1107 LIGHTING. N General. N High-efficiency interior lighting systems. (New 50% rule) SECTION NA1107 CHANGED TO NA1108 Chapter 12 thru 24 Mechanical Administration M Scope. ADDED Systems not addressed refer to Section R REMOVED Section M1203 Service Utilities. MOVED TO Section R111. M All appliances shall have a 30 x 30 clear work space on the control side of the appliances. M Attic and under floor appliance passageways have been extended to a maximum of 50 ft in length when the passageway is 6 ft in height and 22 in wide. M Added new exception. Passageway unobstructed and not less than 6 feet high and 22 inches wide for its entire length, shall not be limited.

7 N Natural ventilation. CHANGED. Reads as per IRC Model Code. M Mechanical ventilation. ADDED...source of ignition is below the mechanical ventilation outlet(s). reads the same as per IRC Model Code. M Foundation and supports for outdoor mechanical systems shall be 3 inches above grade. M Auxiliary & secondary drains shall slope 1%. (1/8 unit vertical in 12 units horizontal) M Item 4A water level detection device may replace an auxiliary/secondary drain if it conforms to UL 508. M Exception Fuel-fired appliances that automatically shut down in the event of a stoppage, needs no auxiliary drain pan. Changed M1501 to General. Each Section has been bumped up one. For Exp. M1501 is now M1502. M A mechanical exhaust system shall be discharged to the outdoors, and shall not be discharged into an attic, soffit, ridge vent, or crawlspace. M Clothes dryer exhaust must terminate not less than 3 feet from an opening M Clothes dryer ducts shall be at least 4 inches in diameter. M The entire clothes dryer exhaust ducts, excluding transition ducts shall be supported and secured in place. M Exception #2 Booster fans are no longer an exception for the maximum length of 25 feet for a clothes dryer duct. A new exception allows for large radius bends as an alternative method. M All Exhaust air shall be exhausted directly to the outdoors. M & M There is a new sound rating for exhaust fans: 1.0 sone for continuous fans and 3.0 sone for intermittent fans. (bath fans) Table M Exhaust rates for residential Dwellings have changed. M General. Ductless hoods Exception has been deleted. NEW M Clearance. Construction not less than 28 gage metal and clearance of at least 24 inches. 2 Exceptions. Kitchens cfm intermittent or 25 cfm continuous Bathing and spa facilities - 80 cfm intermittent or 20 cfm continuous Toilet rooms without bathing facilities 50 cfm Table M New Exhaust duct sizing chart CFM Minimum Flex Max Length Minimum Ridged Max Length Max elbows (diameter) (diameter) (a) 50 4" 25 ft 4" 70 ft 3 5" 90 ft 5" 100 ft 3 6" No Limit 6" No Limit " (b) N/A 4" 20 ft 3 5" 15 ft 5" 100 ft 3 6" 90 ft 6" No Limit 3 a. For each additional elbow subtract 10 feet from length b. Flex ducts of this diameter are not permitted with fans of this size M Bath fans must be controlled by a de-humidistat, timer or similar means of automatic control.

8 M All ducts shall be mechanically fastened. 1. Flex ducts fasteners must comply with UL181B & 181B-C 2. Ridged ducts must have 3 screws or rivets equally spaced ADDED M1906 GASEOUS HYDROGEN SYSTEMS M Installation. In accordance with the applicable requirements of Sections M and M and the Mechanical Code and the Fire Code and the Building Code. M Testing. Included an Exception for continuous loop systems using PEX or PP tubing. Test pressure allowed 100 psi for 30 minutes. NEW M Pressurizing during installation. If imbedded in concrete, pressure test before and during pour. M Piping joints. ADDED a 3 rd requirement. PP tubing installed according to manufacturer s instructions. NEW DEFINITIONS ALL PER IRC Model Code CONNECTOR, APPLIANCE (Fuel) CONNECTOR, CHIMNEY OR VENT. REGULATOR, MEDIUM-PRESSURE (MP Regulator) VENT PIPING. POINT OF DELIVERY. Deleted last sent that reduces pressure to 2 psig. NEW G Auxiliary drain pan. READS AS PER G (307.5) IRC Model Code NEW G Engineered wood products. PER IRC Model Code. G Prohibited locations. This section has been re-written and reads the same as IRC Model Code G (303.3). NEW G Regulator vent piping. PER IRC Model Code. G Prohibited locations. ADDED....shall not extend through any townhouse unit.. G Protection against physical damage. Holes or notches increased to 1.5 inch from the nearest edge of the member, shall protect by shield plates. and shall extend a minimum of 2 inches above sole plates, etc. G Piping in solid floors. ADDED last sentence. Vent conduit above grade to outdoors and prevent the entry of water and insects. NEW TABLE G MANUAL GAS VALVE STANDARDS NEW G Vent piping. G Connecting appliances. ADDED #2 Corrugated stainless steel tubing (CSST), others 2, 3, 4 changed to 3, 4, 5, ADDED #6. CHANGED AND ALL NEW. G Connector installation. G Maximum length. G Minimum size. G Prohibited locations and penetrations. G Shutoff valve. NEW G Protection against physical damage.

9 G Chimney termination. ADDED residential-type or low-heat appliances. Chimneys for medium-heat appliances shall extend at least 10 feet higher than any portion of any building within 25 feet. G Gas vent termination. Changed from G DELETED #1 and replaced with new verbiage ADDED #2. #2 is now #3 and so on. NEW G Roof terminations. G Forced air inlets. As per IRC Model Code G and G NEW G Vent offsets. Type B and L.... G Passage through ceilings, floors or walls. Wording has change Exception has been deleted. NEW G Tee and wye fittings. Per IRC Model Code. NEW G Draft hood conversion accessories. Per IRC Model Code. G Unvented decorative room heaters. (name change) NEW G Ventless firebox enclosures. Per IRC Model Code. M Hydronic piping has added cross-linked polyethylene (PEX) tubing and polypropylene (PP) as approved materials. M Hydronic piping joints has 2 new requirements. 1. Polypropylene joints shall be installed with socket-type heat fused polypropylene fittings. 2. Cross-linked polyethylene shall be joined using cold expansion, insert or compression fittings. M Abandoned fuel oil storage tanks must have the fill piping removed. G Holes bored in framing members within 1.5 inches of the edge of the member needs to be protected with nail plates.