A roof going up near New Orleans has to resist a 144 mph design gust, and that single figure decides the nailing pattern, the sheathing fasteners and whether the windows need impact protection. It comes from the wind map, not from any hurricane’s headline speed, and it crosses a threshold that triggers a real code requirement. Before you order a single shingle, confirm with your parish or city building department which code edition and which wind figure applies to your specific site.
What wind speed must a roof withstand in Louisiana?
The basic design wind speed at New Orleans is 144 mph under ASCE 7-16, the edition the 2021 IRC makes applicable in most states. That number is not a sustained wind and not what a hurricane forecast reports as its top speed. It is a 3-second gust, measured at 33 feet above open, flat ground (what the standard calls Exposure C), for Risk Category II buildings, which is the category ordinary houses fall into. A newer edition, ASCE 7-22, maps the same point at 138 mph. That is not a sign the wind risk dropped. It reflects a different mapping methodology, and which figure governs a given permit depends on which edition the jurisdiction has adopted.
This number is what the whole roof assembly gets designed around in this state. It sets the wind rating a shingle has to carry, the nailing pattern the manufacturer specifies for that rating, how the roof sheathing gets fastened to the rafters or trusses, and the uplift connectors, straps or clips that tie the roof structure down to the wall framing below it. None of that is optional trim. It is the load path that keeps the roof attached to the house when the wind gets under an edge.
Edges, rakes and ridges are where uplift concentrates, which is why they are also where roofs fail first in a wind event. A shingle rated for a given wind speed only performs to that rating with the fastening pattern the manufacturer specifies for the edge and field zones separately, something worth understanding before you compare roofing options generally, which we cover more broadly on our roofing page.
The 144 mph figure belongs to New Orleans specifically, as the reference city for this data. Louisiana’s Gulf coast and inland parishes can carry different design figures on the same map, and elevation, exposure and distance from open water all shift the number. Do not apply the New Orleans figure to a different address. Ask the local building department for the design wind speed that applies at your site before you or a contractor finalize anything.
Does Louisiana require impact-rated roofing or shutters?
This is the part of the wind figure that costs money, so it is worth getting straight. Code sets a threshold at 140 mph: above it, openings (windows, doors, skylights) need impact-rated glazing or approved shutters. At New Orleans, the ASCE 7-16 figure of 144 mph crosses that threshold. The newer ASCE 7-22 figure of 138 mph falls just below it. The two editions genuinely disagree on whether the requirement applies at this location, which is unusual and worth knowing rather than guessing past.
Louisiana’s own code decides which of those applies. The state runs on the Louisiana State Uniform Construction Code (LSUCC), based on the 2021 International Residential Code, administered by the Louisiana State Uniform Construction Code Council under the Office of State Fire Marshal. It has been in force statewide since January 1, 2023, as a statewide minimum that a municipality may exceed with the commission’s approval. The 2024 model codes have already been adopted and take effect January 1, 2027, which will eventually shift the reference edition again. Whether your permit currently falls on the impact-rated side of that 140 mph line is a question for your local building department, not something to assume from the map alone.
Why the requirement targets openings, not just the roof
The logic behind the impact-glazing rule is mechanical, not decorative. A window or door that fails in high wind lets pressure build up inside the house. Once the interior pressurizes, it pushes outward on the roof from underneath, on top of the suction already pulling at it from above. A roof and its windows are, in a wind event, one connected system, not two separate ones.
On the roof’s own terms, the things that matter under these loads are a sealed roof deck (taped or sealed seams at the sheathing joints), ring-shank fasteners that resist backing out under cyclic uplift, a secondary water barrier under the shingles in case the primary covering is compromised, and the connectors that carry uplift load down through the wall framing to the foundation. None of that shows up from the curb, and none of it is something a homeowner can verify by eye. It is inspected work, and it is worth asking your contractor to show you the fastening schedule before the deck gets covered.
Does snow ever matter for a roof in Louisiana?
No, not for design purposes. The design ground snow load at New Orleans is 0 psf under ASCE 7-16, the edition currently applicable through the 2021 IRC. Wind, not snow, is what drives framing, sheathing thickness and shingle selection in this state. The newer ASCE 7-22 maps the same point at 7 psf, but that figure is calculated on a different, strength-level basis than the older nominal figures, and it is still far too small to control any part of the design here. It is not a sign that snow load has increased.
That does not mean an occasional snowfall is harmless. Where it causes trouble in a place that never designs for it is through drainage, not weight. Low-slope or flat sections, blocked scuppers and gutters, and ponding water that refreezes overnight are the real exposure, especially on the flatter roof areas that show up on additions and porches. A roof built for a wind-driven climate is not built with snow shedding in mind, so a rare heavy, wet snow can sit somewhere it should not.
How much does heat shorten a roof in Louisiana?
New Orleans averages 70.7 days a year at 90°F or above, according to NOAA’s 1991-2020 climate normals for that reference station. That is a heavy heat load, and it is the reason a roof in this state ages differently than one in a cooler climate, independent of any storm damage. Louisiana’s counties split between IECC climate zone 2A (37 counties) and zone 3A (27 counties) under the 2021 International Energy Conservation Code, both classified as warm-humid. That moisture on top of the heat matters for how a roof assembly dries out after it gets wet.
What the heat actually does to a shingle
Asphalt shingles hold their flexibility because of oils in the asphalt mat. Ultraviolet light and sustained heat drive those oils out over time. As they go, the mat stiffens and the surface granules, which shield the asphalt from UV in the first place, start letting go faster than they should. A stiff, granule-thin shingle is a shingle that has lost the flexibility that let it lie flat and shed water at the laps. This is a slow chemical process, and it runs faster the hotter the shingle gets and the more days it spends at that temperature, which is exactly what the 90°F count measures.
A dark shingle over a poorly ventilated attic can run its roof deck well above the outdoor air temperature, and that heat has nowhere to go but back down into the attic and the mat above it. Attic ventilation is therefore a roof-lifespan question as much as a comfort one, not a separate concern. So is the underlayment’s own temperature rating, since a synthetic or felt underlayment rated for a lower service temperature can degrade under a hot deck long before the shingles above it show any wear. None of this changes the wind design figures above. It runs in parallel with them, and it is worth asking a roofer what ventilation and underlayment options fit a warm-humid climate zone before assuming any product is interchangeable.
What roofing material suits Louisiana best?
Given a 144 mph design wind speed at New Orleans, the honest starting point is that fastening and deck attachment matter more than which covering you choose. A premium material poorly fastened performs worse in wind than a basic material correctly fastened to its rated pattern. That said, the categories do differ once fastening is equal, and heat and moisture change how they hold up over time.
| Material | What matters in high wind | What matters in Louisiana’s heat and humidity |
|---|---|---|
| Architectural asphalt shingles | Carry a manufacturer wind rating tied to a specific nailing pattern, edges and rakes need the tighter pattern | Asphalt mat degrades faster under sustained 90°F-plus days, ventilation slows this |
| Standing-seam metal | Concealed clips distribute uplift across the panel rather than through exposed fasteners | Reflective finishes cut deck temperature, panels shed water fast in humid climates |
| Concrete or clay tile | Heavy overall, but individual tiles and their fasteners are vulnerable to uplift at edges | Long-lived under UV exposure, minimal oil-based degradation |
Standing-seam metal’s concealed clip system is worth understanding on its own terms: because the fasteners do not penetrate the visible surface, uplift is carried across the whole panel rather than concentrated at exposed nail heads, which is one reason it performs well at the roof edges and ridges where uplift concentrates. Concrete and clay tile carry real weight, which the structure has to be designed for, and while the tile material itself tolerates sun and heat well, the individual fasteners holding each tile down are still an uplift path that needs the same attention as any other covering.
Where the heat load is the bigger long-term concern, a more reflective roof surface lowers deck temperature, which slows the oil loss that stiffens asphalt and reduces the thermal stress on any underlayment beneath it. That is a real, measurable effect, not a marginal one, though it does not change what the wind figure requires for fastening. Readers comparing this against a drier, hotter climate can see how the same heat mechanism plays out differently on our Arizona wind speed and heat page, and those weighing a similar Gulf-facing wind exposure against a neighboring state’s rules can check our Texas wind speed and heat page. Whatever the covering, ask your building department or a licensed engineer to confirm the fastening schedule and wind rating required for your specific address before work begins.