MN Roofing Contractor flashcards
MN Roofing Contractor · Build recall with a focused review session.
31 cards. Read the term and the definition here. The deck at the top of this page is optional.
- Minnesota roofer licensing
- Roofing contractors in Minnesota must hold a state residential building contractor or remodeler license, or work as a qualifying roofer under one, before contracting for residential roof work.
- Contractor recovery fund
- A Minnesota fund that can reimburse homeowners for financial losses caused by licensed contractors, subject to per-claim and per-licensee caps and proof of a judgment or award.
- Mechanic's lien period
- A lien statement must generally be recorded within 120 days after the last labor or material is furnished on the project, and a pre-lien notice may be required for subcontractors.
- Right to cancel
- For home solicitation sales, the homeowner has three business days to cancel in writing; the contractor must provide written notice of this right at signing.
- Written contract threshold
- Minnesota home improvement law generally requires a written contract for residential work exceeding $500, including scope, price, and the contractor's license number.
- Independent contractor test
- Worker status depends mainly on the employer's right to control the manner and means of the work; misclassification creates tax, penalty, and workers' compensation exposure.
- Minimum general liability
- Minnesota typically requires licensed contractors to carry at least $100,000 per occurrence and $300,000 aggregate in general liability insurance, plus workers' compensation for employees.
- Bid versus contract
- An estimate or bid is generally not a binding offer unless stated; the signed contract supersedes prior estimates and should list scope, exclusions, and payment terms.
- Shingle minimum slope
- Standard asphalt shingles require a minimum 2:12 slope with underlayment; below 4:12, double underlayment or a self-adhering membrane is required.
- Low-slope roof systems
- Roofs below 2:12 use built-up roofing, modified bitumen, EPDM, TPO, or PVC; standing-seam metal can go lower with proper seams and underlayment.
- Ice dam membrane extent
- Ice barrier membrane must run from the eave edge to at least 24 inches inside the exterior wall line of heated structures, and Minnesota often requires it at all eaves.
- Underlayment by slope
- No. 15 felt is used on slopes 4:12 and steeper, No. 30 felt on 2:12 to 4:12; synthetic underlayment must be rated for the slope and installed per manufacturer instructions.
- Shingle fastener pattern
- Use four nails per shingle on slopes under 20 units and six nails on steeper or high-wind roofs; fasteners must penetrate at least 3/4 inch into wood.
- Ventilation ratio
- Net free vent area should be about 1/150 of the attic floor area, split between intake and exhaust vents; 1/300 is allowed with a vapor barrier.
- Metal roof thermal movement
- Metal panels expand and contract with temperature, so slotted fasteners and proper clip spacing prevent oil-canning and seam failure.
- Step flashing
- L-shaped flashing pieces woven with each shingle course at sidewalls; counterflashing covers the top edge and kick-out flashing directs water into gutters.
- Slope multiplier formula
- Roof area equals footprint area times the slope multiplier: 4:12 is 1.054, 6:12 is 1.118, 8:12 is 1.202, 10:12 is 1.302, and 12:12 is 1.414.
- Shingle bundles per square
- Three-tab shingles cover about 33.3 square feet per bundle, or three bundles per square; laminated shingles vary from three to five bundles per square.
- Waste factor rules
- Add 10 percent waste for simple gable roofs, 15 percent for hip roofs with valleys, and up to 20 percent for complex roofs with dormers and multiple valleys.
- Ridge cap coverage
- Standard ridge cap covers about 20 linear feet per bundle, while starter strip covers roughly 100 linear feet per bundle.
- Nails per square
- Plan roughly 320 nails per square for four-nail patterns and 480 per square for six-nail patterns; 1-1/4 inch roofing nails run about 150 to 160 per pound.
- Tear-off production rate
- Tear-off typically runs about one to one-and-a-half squares per worker-hour, while shingle installation runs about half to three-quarters of a square per worker-hour.
- Re-roof critical path
- Sequence permit, delivery, tear-off, deck repair, underlayment, flashing, shingles, ridge vent, cleanup, and final inspection, scheduling inspections before covering.
- Estimate contingency
- Carry 5 to 10 percent contingency for hidden deck damage, and price change orders separately with written owner approval before doing the extra work.
- Fall protection threshold
- OSHA requires fall protection at 6 feet or more in construction; low-slope roofing requires guardrails, safety nets, or personal fall arrest systems.
- Ladder setup rules
- Extend ladders 3 feet above the landing, set at a 4:1 slope, secure the top, and keep three points of contact; inspect before each use.
- Minnesota adopted codes
- Minnesota enforces the Minnesota Residential Code based on the IRC plus the state commercial energy code; roof assemblies must meet ice barrier and ventilation rules.
- Drip edge placement
- Drip edge is required at eaves and gables; it goes under the underlayment at eaves and over it at rake edges per manufacturer instructions and the IRC.
- Roof decking minimum
- Roof sheathing must be at least 3/8-inch wood structural panel rated for roof use, fastened per code; deteriorated decking may require re-nailing or re-sheathing.
- Power line clearance
- Keep a 10-foot minimum clearance from power lines, use ground-fault protection on temporary power, and maintain a rescue plan for harness users.
- Attic ventilation exception
- Net free area of 1/300 of the attic floor is allowed instead of 1/150 when a balanced intake and exhaust system or vapor barrier is installed.