What Long Island Weather Actually Does to Siding
Long Island is not Florida (too cold) and it is not Vermont (too warm). It is a barrier-ish landmass sticking out into the Atlantic that gets hit with:
- Nor'easters (October through April). Sustained 30-60 mph winds with horizontal rain. Drive water through any failed seam in your siding.
- Hurricane remnants (August through October). Less frequent but more intense. We still remember Sandy (2012) and Irene (2011). Isaias (2020) took out three walls across my customer base.
- Salt air (coastal, within 2 miles of ocean or bay). Year-round. Accelerates UV fade, corrodes aluminum, rots wood.
- Summer humidity (June through September). 75-95% relative humidity for weeks. Feeds mildew on shaded walls.
- Ice dams and freeze-thaw (December through February). Water backs up behind failing seams during thaws, then re-freezes.
- Mature tree cover (most of LI). Shade slows drying, bird droppings stain, sap etches, and branch impacts damage panels.
Most siding marketing copy talks about "all-weather durability" without addressing any of these specifically. I will do the specific version.
Salt Air: What Handles It, What Does Not
What salt air does to siding
Airborne salt (sodium chloride) deposits on exterior surfaces, bonds with moisture, and creates a mildly corrosive film. Over years, this film:
- Accelerates UV breakdown of vinyl pigments (color fade and chalking)
- Corrodes aluminum trim, aluminum fasteners, and aluminum drip caps
- Oxidizes steel fasteners and flashing
- Combines with trapped moisture in wood to accelerate rot
Material performance in salt air
Vinyl (standard): Fails faster. Premium vinyl rated for 25-40 years inland may only make 15-20 years within 1 mile of the coast. Cheaper vinyl chalks and fades within 10 years. Not recommended for coastal exposure.
Insulated vinyl (CedarBoards): Slightly better than standard vinyl because the foam backer reduces moisture transmission, but still vulnerable to UV fade. Acceptable for 1-2 miles inland from coast. Not for bayfront or oceanfront.
James Hardie fiber cement: Excellent. Cement is inherently non-corrosive, the ColorPlus factory finish is UV-stable for 15+ years, and fasteners can be stainless or hot-dip galvanized. Recommended for coastal exposure.
Maibec engineered cedar: Good to excellent. Factory finish resists salt UV breakdown well, wood substrate is treated against moisture. Still benefits from stainless fasteners at coastal. Recommended for coastal exposure.
Real Western Red Cedar: Good with maintenance. Salt accelerates the silvering and reduces stain lifespan by 20-30%, so the restain interval tightens from 5 years to 3-4 years. Acceptable with diligent maintenance. Not recommended for low-maintenance homeowners.
Aluminum: Bad. Pits, oxidizes, and corrodes at coastal rapidly. Not recommended, period.
Winner for salt air: Hardie or Maibec.
Nor'easters: Wind + Rain + Seam Failure
What nor'easters do to siding
Sustained 30-60 mph winds drive rain horizontally. Horizontal rain does two things that vertical rain does not:
- It gets past J-channel and trim at any seam that is not properly sealed.
- It pushes up under horizontal laps (especially on vinyl and clapboard) that are not fully seated.
The result is water behind the siding. Once water is behind the siding, it gets into the sheathing, the wall cavity, and eventually the framing. This is where mold and rot start.
Material performance in nor'easters
Vinyl: Moderate. Well-installed premium vinyl with correct J-channel sealing handles nor'easters fine. Poorly installed vinyl (too-tight fastening, improper seam overlap, no kickout flashing) fails hard. Install quality matters more than material here.
Insulated vinyl: Slightly better than standard because the foam backer stiffens the panel and reduces wind flutter.
James Hardie: Excellent. Thick, rigid panels with high impact resistance and sealed butt joints. Virtually immune to wind-driven rain penetration when properly installed.
Maibec: Very good. Factory-sealed edges and thick profile handle wind-driven rain well.
Real cedar: Good. Overlap of shakes or clapboards naturally sheds water. Vulnerable at trim junctions if flashing is wrong.
Winner for nor'easters: Hardie, then Maibec, then real cedar. All with correct flashing. The install matters as much as the material.
Hurricanes: The Once-a-Decade Test
What hurricanes do
Long Island does not get direct hurricane hits often, but when we do (Sandy 2012, Isaias 2020, Henri 2021), sustained winds of 60-90+ mph hit the south and east shores. This is a different test than nor'easters. Hurricane winds can:
- Lift and tear off improperly-fastened vinyl panels
- Crack and shatter vinyl from flying debris (branches, roof tiles)
- Drive rain through any unsealed opening
- Cause wind-induced panel flutter that loosens fasteners over time
Material performance in hurricanes
Vinyl: Vulnerable to tear-off if fastening is wrong. Vulnerable to impact damage from debris. Acceptable if installed with correct fastener depth and frequency. Cheap installs fail.
Insulated vinyl: Better than standard vinyl because the panel is thicker and stiffer. Still vulnerable to impact damage.
James Hardie: Excellent. Hardie is fastened through real framing, thick enough to resist impact damage, and rated for hurricane-force winds when installed correctly. Hardie is the reason we have built so much of our post-Sandy rebuild work in Long Beach and south shore Suffolk.
Maibec: Very good. Thick engineered wood panel with deep fastening into real framing. Handles sustained winds well.
Real cedar: Good. Heavy, thick shakes stay put. Vulnerable to impact damage.
Aluminum: Bad. Lightweight and easily damaged by wind and debris.
Winner for hurricanes: Hardie, then Maibec.
Summer Humidity: The Mildew Test
What LI summer humidity does
Long Island summers can run 75-95% relative humidity for weeks. Shaded walls (north walls, walls under mature tree canopy) stay damp. Damp walls grow mildew and algae.
Material performance in humidity
Vinyl: Vulnerable to green mildew staining on shaded walls. Cleans with a hose and soft brush. Not a material failure, just cosmetic.
Insulated vinyl: Same as standard vinyl.
James Hardie: ColorPlus finish resists mildew better than field-painted products. Still needs occasional cleaning on shaded walls.
Maibec: Factory finish resists mildew. Similar to Hardie.
Real cedar: Vulnerable. Cedar tannins actually feed some mildew strains and shaded real cedar can get blotchy within 2-3 years. Part of the maintenance cycle.
Winner for humidity: Hardie or Maibec. Vinyl is acceptable but needs seasonal cleaning.
Ice and Freeze-Thaw
What ice does
Long Island winters produce significant ice dam formation on eaves and corners. Meltwater backs up behind the siding, refreezes, and can damage the siding or the sheathing behind it. Freeze-thaw cycling over years loosens fasteners and cracks brittle materials.
Material performance
Vinyl: Becomes brittle below 20°F. Impact damage during cold snaps is real. Once warmed back up, vinyl is fine. Moderate.
Insulated vinyl: Slightly more impact-resistant in cold because the foam backer provides support.
James Hardie: Completely unaffected by cold. Cement does not care about freeze-thaw.
Maibec: Unaffected. Engineered wood handles freeze-thaw well.
Real cedar: Good. Natural wood handles freeze-thaw for decades.
Winner for ice: Hardie or Maibec.
Mature Trees: The Underrated LI Factor
What mature trees do
Long Island neighborhoods are shaded. Great for property values, tough on siding:
- Bird droppings stain all siding
- Maple and tulip sap etches painted finishes
- Falling branches damage panels
- Shaded walls stay damp (see humidity section)
- Squirrels and birds occasionally cause direct damage
Material performance
Vinyl: Bird droppings and sap clean easily. Impact damage from branches is a real problem; a single broken branch can crack 2-4 panels. Panel replacement is possible if you have the matching color on file.
Insulated vinyl: Slightly more impact-resistant than standard.
James Hardie: Excellent impact resistance. A branch that would crack vinyl usually just dents Hardie at worst.
Maibec: Good impact resistance. Slightly better than vinyl, not as good as Hardie.
Real cedar: Good. Cedar shakes are individually replaceable if one gets damaged.
Winner for tree cover: Hardie.
What I Actually Recommend by Location
Oceanfront and bayfront (within 1 mile of water)
Best: James Hardie with stainless fasteners and salt-rated flashing. Maibec is a solid second.
Acceptable with caveats: High-end real cedar with diligent maintenance.
Not recommended: Standard vinyl, aluminum, cheaper vinyl.
Examples: Long Beach, Ocean Beach, Bay Shore canal homes, Massapequa canal homes, Cove Neck, Amagansett, Montauk.
Coastal-influenced (1-3 miles from water)
Best: Insulated vinyl (for budget), Hardie (for premium), Maibec (for cedar look).
Acceptable: Premium standard vinyl.
Not recommended: Cheap builder vinyl.
Examples: Most of Babylon, most of Islip south, Freeport, Hewlett, Sayville, much of the North Shore.
Inland (more than 3 miles from coast)
Best: Anything. Your choice depends on budget, appearance preference, and ownership timeline.
Not recommended: Cheap builder vinyl (not because of weather, just because it fails in 10 years).
Examples: Hicksville, Plainview, Levittown, Commack, Smithtown, Huntington Station, most of central Nassau and central Suffolk.
Historic district homes
Best: Real cedar or Maibec Heritage with period-appropriate trim. Hardie Artisan if the review board allows.
Examples: Garden City historic district, Port Jefferson village, Oyster Bay village, Sag Harbor, Southampton village, Roslyn, Sea Cliff.
Weather Is a Real Variable, Install Quality Is Bigger
Long Island weather is tough on siding but install quality matters more than material choice for almost every weather scenario above. A badly-installed Hardie job will fail before a well-installed vinyl job during a nor'easter. A perfect Maibec install will outlast a rushed real-cedar install by decades.
Pick the contractor first. Pick the material with the contractor you trust. Ask them what they would put on their own house in your specific LI zone and why. If the answer is generic, find a different contractor.
If you want us to walk your house and talk through the right material for your specific location and exposure, we will do that for free. No pitch, no pressure, just a real conversation.
Schedule a walk-through → Free estimate Or call Mike direct → (516) 555-0100
Still have questions?
This guide was written by Mike Reilly. If your situation has a wrinkle we did not cover, call us direct. Most questions we answer by phone take five minutes.