Big Easy Roofing has seen every siding installation mistake that New Orleans weather punishes, from underlayment failures that trap moisture inside wall cavities to improper nailing that lets panels rip off during hurricane season. Homeowners here face a combination of climate threats that magnify installation errors far beyond what drier markets experience. This guide covers the most common siding mistakes and explains how each one leads to premature failure, structural damage, or costly replacement.
This is the single most expensive siding mistake you can make here. Without a properly installed weather-resistive barrier (WRB) such as house wrap, water that penetrates siding panels reaches the wall sheathing and framing directly. Mold, wood rot, and structural decay follow — and they stay hidden until the damage gets severe.
A ventilated rain screen gap between the siding and the WRB is strongly recommended by building science experts because it allows moisture to drain and evaporate rather than becoming trapped. Trapped moisture in wall cavities is the leading cause of premature siding failure along the Gulf Coast, where high humidity, heavy rainfall, and warm temperatures accelerate mold growth and wood decay faster than in any other U.S. climate zone.
Every siding material requires a moisture barrier in this region — vinyl, fiber cement, engineered wood, and metal panels alike. The barrier must be installed shingle-style from bottom to top with properly lapped seams, and all penetrations around windows, doors, electrical outlets, and hose bibs must be sealed with compatible flashing tape.
Skipping this step to save a few hundred dollars on materials is a gamble that almost never pays off when you’re dealing with the kind of annual rainfall New Orleans gets.
It sounds like a small detail. It isn’t. Siding panels in Southeast Louisiana experience significant thermal expansion because summer temperatures regularly exceed 95 degrees Fahrenheit with heat index values above 110 degrees. Nailing vinyl or fiber cement panels too tightly prevents the natural expansion and contraction that occurs during extreme temperature swings between summer highs and winter lows.
Vinyl siding nailed too tightly buckles and warps when summer heat forces the panels to expand with no room to move. The correct technique requires leaving approximately 1/32 inch of space between the nail head and the panel’s nailing flange, allowing the panel to slide freely as temperatures change. Fiber cement panels nailed too tightly crack at the nail penetration points because the rigid material cannot flex.
Nails driven at an angle rather than perpendicular to the wall surface create stress points that weaken panel connections during high winds. In a hurricane zone where sustained winds regularly exceed 100 mph, every nail must be driven straight and at the correct depth to maintain the panel’s wind-resistance rating.
The transition from nailing mistakes to flashing problems is worth noting: both errors create entry points for water, but they damage different parts of the wall assembly.
Water finds every gap. Improper flashing around windows and doors is the single most common entry point for water damage behind siding in New Orleans homes. Contractors who skip flashing, use the wrong materials, or install flashing in the wrong sequence create gaps that allow wind-driven rain to penetrate wall cavities during every storm.
Much of the city’s heavy annual rainfall arrives during intense thunderstorms and tropical weather events that drive water horizontally against building exteriors, according to the National Weather Service. Properly installed flashing includes a sill pan under each window, side flashing lapped over the sill pan, and head flashing lapped over the side pieces, all integrated with the weather-resistive barrier behind the siding.
Kickout flashing at every roof-to-wall intersection matters because water cascading off a roof edge without it flows directly behind the siding, causing concentrated rot damage at the junction. Many older homes built before modern flashing standards were adopted lack kickout flashing entirely, and adding it during a siding replacement project prevents one of the most common sources of hidden water damage.
Siding installed too close to the ground creates a direct pathway for Formosan subterranean termites to reach the wood framing of the structure. Greater New Orleans residents and businesses spend an estimated $300 million annually on Formosan termite control and damage repair according to LSU AgCenter research, and improper ground clearance is one of the most common construction deficiencies that gives these termites access.
Most siding manufacturers require a minimum of 6 inches of clearance between the bottom edge of the siding and the finished grade. James Hardie specifies 6 inches minimum, and wood-based siding products require even greater clearance in termite-active regions. Siding that contacts soil, mulch, or landscaping materials absorbs ground moisture and provides a concealed bridge for Formosan termites to enter the structure without crossing an exposed concrete foundation where they could be detected during routine inspections.
Homeowners should also verify that mulch, planting beds, and hardscape elements like patios and sidewalks do not cover the required clearance gap after siding installation. A siding job that meets clearance requirements at completion but is later compromised by landscaping changes is a common scenario that Big Easy Roofing encounters during siding repair calls across Orleans Parish and Jefferson Parish.
Ground clearance also connects to the next issue — material selection — because some siding products absorb moisture from soil contact far faster than others.
Not every siding product belongs on a house in this climate. Selecting materials based on national pricing guides without accounting for local performance leads to premature replacement. Materials that work fine in dry or moderate climates fail faster where sustained humidity exceeds 75%, salt air accelerates corrosion, and intense subtropical UV exposure degrades anything that lacks moisture and UV resistance.
Natural wood siding without marine-grade treatment or continuous maintenance fails within 5 to 10 years here compared to 15 to 20 years in drier climates. Untreated engineered wood products absorb edge moisture and swell or delaminate at the seams. Standard stucco develops hairline cracks that allow water infiltration, and that trapped moisture creates hidden mold and rot between the stucco and the sheathing.
The highest-performing siding materials for this region are fiber cement (James Hardie HardiePlank or LP SmartSide), hurricane-rated vinyl, and aluminum. Each resists moisture absorption, Formosan termite damage, and UV degradation in IECC Climate Zone 2A, which covers all of Southeast Louisiana including New Orleans, Metairie, Kenner, Slidell, and the Northshore communities.
Fiber cement is porous. Boards delivered from a climate-controlled warehouse or a drier region carry a different moisture content than the ambient conditions at the job site. Installing them before acclimation causes the panels to expand after installation, leading to buckling, cracked joints, and gaps that compromise the wall’s weather resistance.
James Hardie recommends storing fiber cement planks flat and uncovered at the job site for at least 48 hours before installation. In New Orleans, where relative humidity regularly exceeds 80% during summer months, this waiting period matters more than in most markets because the moisture differential between warehouse-stored boards and outdoor conditions can be substantial.
Contractors who rush this step create joints that gap open as the panels adjust post-installation, allowing water infiltration that defeats the purpose of choosing a moisture-resistant material. Entirely preventable with proper scheduling and on-site storage.
Every storm brings them. Louisiana requires contractors performing work valued at $7,500 or more to hold a valid license from the Louisiana State Licensing Board for Contractors (LSLBC). Hiring an unlicensed contractor for siding installation exposes homeowners to financial liability if the work fails, because unlicensed crews typically do not carry the workers’ compensation insurance and general liability coverage required by Louisiana law.
Storm-chaser crews arriving from out of state after hurricane events are a recurring problem. They capitalize on high demand for exterior repairs but often lack knowledge of Louisiana building codes, wind-rated installation requirements, and the specific material handling practices the local humidity demands.
Before hiring a siding contractor, homeowners should verify the contractor’s LSLBC license number at the Louisiana State Licensing Board website, confirm active general liability and workers’ compensation insurance, request references from completed siding projects in Orleans Parish or Jefferson Parish, and confirm the contractor specifies wind-rated fastening schedules appropriate for the hurricane zone.
Siding and gutters are one system. When installation does not properly integrate the two, water management fails and damages both the siding and the structure behind it. During intense summer thunderstorms that regularly deliver 2 to 4 inches of rain per hour, improperly placed gutters allow water to overflow behind siding panels and saturate the wall cavity.
Gutters must be installed after siding completion and positioned so the back edge tucks behind the drip edge or starter strip at the roofline. Downspouts must discharge at least 4 feet from the foundation to prevent ground saturation that wicks moisture up into the siding through capillary action. Across much of Orleans Parish and Jefferson Parish, where the water table sits close to the surface, poor drainage compounds moisture problems at the siding-to-foundation junction.
Every mistake in this guide shares a common thread: water gets in, and the climate keeps it from drying out. The combination of rainfall volume, ambient humidity, wind-driven storms, and termite pressure makes New Orleans one of the most unforgiving environments for sloppy siding work anywhere in the country.
Big Easy Roofing coordinates residential siding installation with gutter system placement to ensure water management works as a complete system across homes in New Orleans, Metairie, Kenner, and the surrounding Louisiana Gulf Coast. For commercial siding projects, proper integration with commercial gutter systems and scuppers is equally important for protecting the building envelope. Contact Big Easy Roofing for a free siding inspection to identify installation mistakes before they become structural failures.
The most common siding installation mistake in New Orleans is improper or missing flashing around windows and doors. The city’s heavy annual rainfall — much of it arriving as wind-driven storms — pushes water horizontally against building exteriors. Improperly flashed window and door openings allow water to penetrate behind the siding into the wall cavity, causing mold, wood rot, and structural damage that remains hidden until repair costs become significant.
New Orleans humidity, which averages above 75% year-round, accelerates moisture-related failures in materials that are not designed for subtropical conditions. Fiber cement boards must acclimate to local humidity for at least 48 hours before installation to prevent post-install expansion and cracking. Wood siding absorbs ambient moisture and requires continuous maintenance to prevent rot and mold. Moisture barriers and ventilated rain screen gaps behind siding panels are needed to prevent trapped moisture from destroying the wall assembly.
Ground clearance matters because Formosan subterranean termites in Greater New Orleans cause an estimated $300 million in annual damage and control costs according to LSU AgCenter research. Siding installed too close to the ground provides a concealed bridge for termite colonies to access wood framing without crossing exposed foundation surfaces where they could be detected. Most siding manufacturers require a minimum of 6 inches between the bottom of the siding and the finished grade, and maintaining this clearance is especially important where Formosan termite pressure is among the highest in the United States.
Louisiana law requires contractors performing work valued at $7,500 or more to hold a valid license from the Louisiana State Licensing Board for Contractors (LSLBC). Hiring a licensed siding contractor in New Orleans means the installer carries required workers’ compensation and general liability insurance, understands Louisiana building codes for wind-rated installation, and can be held accountable through the state licensing board if workmanship fails. Homeowners can verify any contractor’s license status at the LSLBC website before signing a contract.
Vinyl siding panels buckle in New Orleans summers because installers nail the panels too tightly, preventing thermal expansion when temperatures exceed 95 degrees Fahrenheit with heat index values above 110 degrees. Vinyl siding requires approximately 1/32 inch of space between the nail head and the nailing flange so panels can slide freely as they expand and contract. Panels nailed flush against the wall surface have no room to expand outward, and the resulting stress causes visible buckling, warping, and wavy lines across the siding surface.
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By Big Easy Roofing 
May 22, 2023 
