Exam Cheat Sheet · Quick Reference
Idaho Manufactured Housing Retailer
Idaho · PSI Services Contractor
Idaho State Portion 50 questions
Key Distinctions
Under the definition of "Accessory Building or Structure," accessory buildings include ramadas, storage sheds and garages, while accessory structures include awnings, carports, decks, steps and ramps.
Idaho Manufactured Home Installation Standard Manual, Definitions, Item 02 (Page 62)Construction is work performed inside the home after it leaves the factory (affecting arrangements/methods of construction, fire and life safety, and electrical, plumbing and mechanical systems), while siting is work performed outside the home to place it on its site, expressly including support and tie-down systems, utility connections, skirting and steps.
Idaho Manufactured Home Installation Standard Manual, Definitions, Item 32 (Page 64)Air conditioning, after-market electrical or plumbing equipment and mechanical equipment are utilities inspection items, whereas duct crossovers, flue/chimney/vents and dryer exhaust ducted through skirting or foundation are installation inspection items.
Idaho Manufactured Home Installation Standard Manual, Chapter 2, Subsections 204.02-204.03 (Pages 16-17)A standard set is a home on footings and piers with the perimeter enclosed by above-ground skirting or fascia, while a foundation set is on footings and piers with the perimeter enclosed by a supporting permanent foundation footing and stem wall extending below the frost line.
Idaho Manufactured Home Installation Standard Manual, Definitions, Items 24 and 63 (Pages 63, 67)A ground level installation has a below-grade foundation system with a perimeter retaining wall or foundation that has earth backfilled against it, while a foundation set is on footings and piers with a permanent foundation footing and stem wall extending below the frost line.
Idaho Manufactured Home Installation Standard Manual, Definitions, Items 24, 31 and 63 (Pages 63-66)Stabilizing devices covers ALL components of both the anchoring and support systems (piers, footings, foundations, ties, anchoring equipment, ground anchors), while support system is only foundations, footings, piers, caps and shims, foundation system is a perimeter footing and stem wall support, and a load bearing device is a single support component.
Idaho Manufactured Home Installation Standard Manual, Definitions, Item 62 (Page 67)On a permanent foundation set they are placed not more than 30 inches from the ends of the frames, while on a standard set they are placed not more than 12 inches from the ends of the frames (both then continue at 6 feet on center).
Idaho Manufactured Home Installation Standard Manual, Chapter 5, Subsection 503.01 (Page 36)Permanent foundation pads must be nominal 8 inches or thicker, while the 4-inch pad is the minimum for standard set installations.
Idaho Manufactured Home Installation Standard Manual, Chapter 5, Subsection 502.01 (Page 34)The entire marriage line must be supported by minimum 256 square inch poured-in-place footings and piers, while on a conversion every ridge beam support column must bear on a footing of minimum 512 square inches.
Idaho Manufactured Home Installation Standard Manual, Chapter 5, Subsection 503.03 (Page 37)Anchors, straps and tension devices must resist an allowable working load equal to or exceeding 3,150 lbs., and must additionally withstand a 50% overload of 4,725 lbs. without failure of the equipment or attachment point.
Idaho Manufactured Home Installation Standard Manual, Chapter 5, Section 505 (Pages 43-44)Single stack block piers are limited to loads not to exceed 5,000 pounds and double stack block piers to 16,000 pounds; double and single piers may be combined for higher loads.
Idaho Manufactured Home Installation Standard Manual, Chapter 5, Subsection 502.02 (Page 35)The 1/2" x 10" bolt attaches the 2x4 sill plate to a poured concrete stem wall (6 feet on center and within 12 inches of each corner), while the 1/2" x 7" bolt secures the bottom plate of a pressure treated wood stem wall to its footing.
Idaho Manufactured Home Installation Standard Manual, Chapter 5, Subsection 504.01 (Page 39)A ramada is a stationary roof structure extending over the manufactured home (and possibly a patio or parking space) for protection from snow, sun or rain; a carport is a roof with supports and not more than one wall for sheltering a motor vehicle, an awning likewise has not more than one wall, and a porch may have two or more walls.
Idaho Manufactured Home Installation Standard Manual, Definitions, Item 52 (Page 66)A tag is a label or insignia issued by the Division applied to indicate compliance with federal or state laws, rules and regulations, while "labeled" refers to the identifying mark of a nationally recognized testing laboratory or inspection agency on equipment and materials.
Idaho Manufactured Home Installation Standard Manual, Definitions, Items 34, 44 and 65 (Pages 64-67)Permits are required before installing a home on a building site or in a park, including display homes in parks, subdivisions and residential lots and homes occupied on a sales lot; permits are NOT required for unoccupied manufactured homes temporarily displayed on a sales lot or in storage.
Idaho Manufactured Home Installation Standard Manual, Chapter 2, Subsection 201.01 (Page 15)Key Terms
Formulas to Know
30 to 40 psf → 8 ft on center max; over 40 and up to 60 psf → 6 ft on center max; over 60 and up to 80 psf → 4 ft on center max. (Example: a 50 psf roof load requires 6 ft on center.)over 40 and up to 60 psf → 6 ft on center max; over 60 and up to 80 psf → 4 ft on center max; over 80 and up to 100 psf → 3 ft on center max. (Example: 75 psf with bearing wall above requires 4 ft on center.)30–40 psf → 8 ft; 41–60 psf → 6 ft; 61–80 psf → 4 ft; over 80 and up to 100 psf → 3 ft on center maximum. (Example: 90 psf with bearing wall above requires 3 ft on center.)Single stack permitted up to 36 in. high under the main frame or marriage line and up to 48 in. high under perimeter walls; above those heights piers must be double stacked with interlocking blocks; no block pier over 80 in. high unless designed by an Idaho Licensed Professional Engineer (403.04 likewise caps pier height at 80 in.).Single stack ≤ 5,000 lb; double stack interlocking ≤ 16,000 lb; double and single piers may be combined for higher loads.Test to 1.5 × horizontal wind load of 15 psf, in combination with a roof uplift of 9 psf, using ASTM D-3953 test procedures.Allowable working load ≥ 3,150 lb, and withstand a 50% overload (4,725 lb) without failure of the equipment or attachment point.1/4 in. per foot, except as otherwise permitted by the authority having jurisdiction; where a full size cleanout is installed at the upper end, grade may be reduced to 1/8 in. per foot.Vent within 3 ft of each corner and at 20 ft maximum spacing (consistent with underfloor ventilation placement of Section 902).No more than 25% of main frame pier supports may exceed 36 in. in height without prior approval of the local authority having jurisdiction, unless the home is set on a basement.