LA Roofing Contractor common mistakes
LA Roofing Contractor · Understand the traps and how to avoid them.
Specifies 3-tab asphalt shingles on a 2:12 roof with only a single layer of No. 15 felt under them.
Crews routinely shingle down to 2:12 in the field, so candidates carry that habit into exam items without checking the low-slope restriction and double-underlayment rule.
What to do instead
Memorize IRC R905.2.2: asphalt shingles are allowed down to 2:12, but between 2:12 and 4:12 they require double underlayment; below 2:12 specify a low-slope membrane system instead.
Selects electro-galvanized or uncoated roofing nails for a roof in coastal Louisiana.
Suppliers stock the cheapest fastener and inland practice uses standard galvanized, so candidates overlook salt-driven corrosion.
What to do instead
Choose hot-dip galvanized or stainless fasteners that meet the manufacturer's corrosion spec, and verify shingle nail length and head diameter against IRC R905.2.5.
States that a 1-inch side lap is acceptable for asphalt-saturated felt underlayment on a steep-slope roof.
Roll goods are often lapped by eye in the field, and candidates generalize from other membrane side-lap practices.
What to do instead
Use the code minimum: No. 15 felt with 2-inch side laps and end laps per the manufacturer; in high-wind areas follow the manufacturer's increased attachment schedule rather than the default nailing pattern.
Adds an ice-dam protection membrane to a Louisiana roof assembly because a national study guide says it is required.
Prep materials written for cold climates present ice barriers as universal, and candidates memorize the rule without the climate condition.
What to do instead
Learn IRC R905.1.2 as conditional: ice barriers are required where there is a history of ice damming. For Louisiana plans, check the specific roof assembly and local amendments before adding one.
Measures roof dimensions with a ruler on the printed plan instead of using the written dimension strings and stated scale.
Plans are reduced when printed, and candidates transfer field estimating habits to plan-reading items.
What to do instead
Read dimension strings first, use the graphic scale only to verify, and convert plan area to roof area with the slope factor (square root of rise squared plus run squared, divided by run).
Sizes attic ventilation at 1/300 net free area without checking whether balanced intake and exhaust and a vapor retarder are present.
The 1/300 exception is memorable and gets applied everywhere, while the base 1/150 rule and its conditions are forgotten.
What to do instead
Start from IRC R806.2: 1/150 of the attic floor area, with at least 50 percent intake and 50 percent exhaust, and use the 1/300 exception only when the code conditions are met.
Treats a handshake as sufficient for a residential roofing job and skips required contract disclosures and cancellation language.
Small-job field experience suggests paperwork is optional, so candidates answer contract questions from habit rather than from statute and board rules.
What to do instead
Build a contract checklist from LSLBC rules and Louisiana home-solicitation law: written terms, scope, price, payment schedule, and the exact cancellation notice and period.
Answers Louisiana private-works lien questions by assuming one deadline applies to the owner, general contractor, and subcontractor alike.
Lien law is learned on the job in fragments, and candidates collapse the separate notice and filing steps into a single date.
What to do instead
Map the Private Works Act as a timeline: notice of contract, subcontractor notice, and statement of claim each have separate triggers and deadlines. Study them as distinct events, not one filing.
Applies the 4-foot fall-protection trigger to residential roofing work.
Candidates mix OSHA general-industry rules with construction rules, and 4 feet is the number they remember from other safety training.
What to do instead
Use OSHA construction standards: 6-foot trigger under 29 CFR 1926.501, plus the roofing-specific requirements for warning lines, slide guards, or personal fall-arrest systems under 1926.501(b)(13).
Sets an extension ladder so it stops at or just below the roof edge and leaves the top unsecured.
Candidates picture ladder use from routine jobs and do not check the access-standard dimensions.
What to do instead
Extend the ladder at least 3 feet above the roof edge, secure it at the top, and set it at the proper 4:1 angle under 29 CFR 1926.1053.