Installation Codes Manufactured Home Installer CoursePart 2
Licensing for Installers • What’s been the Timeline? • Jan 1, 2007 –licensing began • April 1, 2007 – new installation code effective and inspections began
Licensing • You need a license to install a home on a foundation. If you ONLY do the following no license is required: • Anchoring – no • Grading – no • Excavation – no • Pouring basement – no • The person supervising the home going on the foundation - yes
Licensing • Your license is subject to the requirements for General Supervision – the installer does not need to be on the job site but must be available to the building inspector • Homeowners are exempt from licensing but if people help and would otherwise need a license they must be licensed
Licensing of Installers • Qualifications • 18 years old • Not been found responsible in any court or agency hearing of a violation of the installation law during prior 2 years • Not been found responsible in any court or agency hearing for failure to perform under installation contract or defrauding a person in the provision of installation services
Application for Installers License • A state license fee plus one time application fee for 4 year license • Take 12 hour qualifying class & pass exam
Renewal • Renewal requires 12 hours of continuing education over the 4 year period • Also must not have been found responsible for breaking the rule or defrauding a customer
Wisconsin Installation Standard • Act 45 laws of 2005 authorized the Department Commerce to adopt standards
Comm 21.40 • Formerly Comm 27.18 • Now a part of the UDC • Applies to homes built before April 1, 2007 April 1, 2007 Comm 21.40 applies Part 3285 applies Home Built before April 1Home Built on or after April 1 • Code starts on page 9 of your workbook
Comm 21.40 • Review pages 9 and 10 of your workbook for all of the details regarding the code for Pre-April 1, 2007 built homes.
Comm 21.40 for homes before 4/1/2007 • No footing on unprepared fill. All organic matter must be removed. • Soil bearing test using pocket penetrometer • Grade site to drain water away for minimum of 5 ft from home • A footing for every pier, nominal 16” by 16” • Consult others if soil is less than 2000 psi
Comm 21.40 Footings • one 4 by 16 by 16 solid blocks or two 4 by 8 by 16 solid blocks. • 16 by 16 ABS pad rated at not less than 6000 lbs • 18 inch diameter hole bored below the frost line or to unfractured bedrock and filled with poured concrete • Other materials or systems approved by Commerce • Note: frost protection not required
ABS Pads • ABS pads are permitted for homes built prior to April 1, 2007. • The honeycomb always faces up
Not all ABS Pads are the Same! 4755 lbs/sq ft 4000 lbs/sq ft 5000 lbs/sq ft In 2000 pfs soil, the capacity of each pad is as shown above, also the direction of a single stack of blocks is specified on the back with arrows.
Comm 21.40 Piers • Concrete blocks, manufactured steel stands or manufactured concrete stands • Single stack piers limited to 36 inches • Single stack piers loads limited to 8,000 lbs • 36 to 80 inch piers – double blocked (layered in opposing layers) • 80 inch or more – double blocked laid in concrete mortar, cores filled with mortar and ½ inch steel reinforcing rod* • Note mortar and reinforcing rod is more stringent than Part 385
Comm 21.40 Concrete Blocks • 2 core design, construction grade 8x8x16 • Cores placed with cores open vertically • Block nearest main frame shall be perpendicular to the linear direction of frame • No block may contact the frame
Comm 21.40 – Pier Spacing • No more than 7 feet on center • No more than 3 feet from exterior side of each end wall • Can be varied to follow manufacturer tables • Piers under clear-span openings of 4 feet or more in mating walls • Piers must be plumb and centered under point of support
Comm 21.40 - Caps • Solid concrete block or solid wood block having nominal thickness of at least 2 inches • Cap must be same width and length as top of pier • No more than 2 pieces – 2 piece caps positioned with joint perpendicular to frame if used
Comm 21.40 - Shims • Where used, driven from opposing sides and be no less than 4” by 8” • Wood caps and shims at least equal to #2 spruce pine fir with min bending stress rating of 1200 psi. All wood caps must be of same species of wood. All shims must be of same species of wood. • Note - shims not required but concrete blocks cannot contact the frame.
Comm 21.40 – Height limits • Combination of nominal 2 inch solid concrete block or wood cap plus shims must not exceed 3 ½ inches • Minimum clearance under home of 12 inches between lowest point of main frame in area of utility connections. Min clearance of 12 inches for 75% of home. Remainder may be less than 12 inches but cannot touch ground
Recap on 21.40 on key items • All organic matter removed • Proper drainage • 7 foot maximum spacing between piers • Construction grade blocks • Any hardwood used must be the same species • If ABS pads used, honeycomb is up • Double stacked blocks above 36”
Federal Installation Standard • Known as Part 3285 this code applies to home built on or after April 1, 2007. • The Wisconsin changes are noted in the text in your binder – latest changes were 3/19/09
The Standards • 3280 – HUD Construction Standards for the home • 3285 – HUD Model Installation Standards • The following must be AT LEAST AS STRINGENT as the federal model • State Standards • Manufacturer Manuals
Understanding Part 3285 • Use the Blue and Red Cheat Sheet • This Key to the Code will help you find applicable sections as you use the code quicker!
Definitions • Words have meaning so read them carefully – see 3285.5 • For example, an anchor is a part of an anchoring system.
DAPIA • DAPIA – means Design Approval Primary Inspection Agency • A manufacturer must provide with each new home a DAPIA approved designs and instructions that are consistent with the standards – 3285.2
Application of the Standard • These standards apply to HUD Code manufactured Homes not modulars.
Fire Separation • Fire separation distances in accord with NFPA 501(a) must be maintained. Means 10 feet • Fire separation distance must also comply with Comm 26 in a mobile home park (10 feet between basic structures) • Local ordinances might have additional requirements
Flood Zones • Installer is responsible to determine if home is being installed in flood zone. 3285.102(c) – Contact the zoning administrator for the county • If it is, special installation methods are required. • Note there are also Shoreland zoning implications
Zone Maps • 3 maps in the HUD Code • Wind – Wisconsin in Zone 1 • Roof Load – Wisconsin is South and Middle Zones • Thermal Zone – Wisconsin is Zone 3 • U/O value must be less than 0.079 • U/O is inverse of R value 0.079 = R 12.6 • Homes may not be installed in a wind zone that exceeds the design load for the home. • See pages 11 & 12 in your workbook
Site Preparation • Soil tests can be conducted with a pocket penetrometer • Footings must be sized and spaced according to soil bearing capacity • See the tables in 3285.202 • Poor soils – peat, organic clays or uncompacted fill require a geologist, engineer or architect’s opinion
Site Drainage • Drainage must be provided to direct surface water away from home and prevent build up under home. • Minimum slope of ½ inch per foot for the first 10 feet for homes built on or after April 1, 2007 and 5 feet for older homes. • Where site is sloped, home must be protected from surface runoff
Gutters and Downspouts • Manufacturer must specify if the home is designed for gutters and downspouts • When installed, runoff must be directed away from the home
Ground Moisture Control • Vapor barrier must be installed • Min. 6 mill poly or equivalent • Overlap 12 inches and seal • Barrier may be under, over or around footings • Voids and tears must be repaired • 3285.204
Ground Moisture Control • 1 pint of water vapor is generated in 24 hours • @ 55 degrees under 10 sq. ft of floor area. 1500 sq ft home then equals 150 pints of water. That’s 16-19 gallons of water
Foundations - Piers • Concrete blocks – Must conform to ASTM standard C 90-02 • Pressure treated wood – think pilings • Adjustable metal - Manufactured piers must be labeled or listed for loads and installed to the pier manufacturer’s instructions
Pier loads • Must be designed with load taken into consideration • Spacing is dependant on factors such as soil bearing capacity and foot size • See tables at 3285.303 • Pier spacing tables do not take into consideration flood or seismic loads
Pier Configuration • Load bearing blocks not decorative • Nominal 8 by 8 by 16 inches • Stacked with hollow cores aligned vertically • When stacked side by side, each layer at right angles to preceding one • Center beam/mating line supports are always required for multi-section homes • Primary failure regarding piers is insufficient sizing of mating line piers under ridge beam openings
Caps • Must evenly distribute loads across the capped hollow block piers • May be made of solid concrete or masonry at least 4 inches nominal thickness OR • hardwood lumber at least 2 inches thick
Caps • Must be same length and width as piers • Split caps on double stacked piers must be installed with long dimension across the joint in blocks below
Gaps • Must be filled • Options • 2nd 4” concrete block but cannot contact frame • Nominal 4 by 6 by 1 inch shims • Must be used in pairs • Driven tightly • Must not occupy more than 1 inch of vertical space
Manufactured Piers • Adjustable risers must not extend more than 2 inches when finally positioned
Clearance under Home • Minimum of 12 inches between lowest member of main frame and grade under all areas of the home • Comm 21.40 for older homes is A minimum clearance of 12 inches shall be maintained beneath the lowest point of the main frame in the area of any utility connection. A minimum clearance of 12 inches shall also be maintained under the home for at least 75% of the home. The remainder of the home may be less than 12 inches above the ground but may not touch the ground.