Everyone blames hurricanes and flooding. But the real killer of coastal homes is something you breathe every day: salt air.

Salt air corrodes metal fasteners, destroys untreated wood, eats through standard paint, and accelerates mold growth in ways that inland homes never deal with. Most contractors use the same materials they'd use 200 miles from the coast — and homeowners pay for it 3-5 years later.

Here's what most people get wrong:

1. Using pressure-treated wood for exterior trim

Pressure-treated lumber resists rot, sure. But salt air attacks the copper in the treatment and the fasteners holding it together. PVC trim or composite decking costs more upfront but lasts 3-4x longer in a salt environment.

2. Ignoring the water shut-off valve

Every coastal homeowner should know where their main shut-off is — inside AND outside. When a pipe corrodes (and in salt air, it will), the difference between a $200 fix and a $5,000 flood is knowing where that valve is before you need it.

3. Standard paint on exterior surfaces

Regular exterior paint breaks down in 2-3 years near the coast. Marine-grade or elastomeric coatings are designed for salt exposure and can last 7-10 years.

4. Waiting too long on small leaks

A dripping toilet or a slow leak under a sink is annoying anywhere. Near the coast, moisture + salt air = mold growth at double the rate. What would take 6 months to become a problem inland takes 6 weeks at the beach.

I started Beach House DIY because I got tired of watching people throw money at problems that could've been prevented with the right information. If you own or manage a coastal property, this is worth paying attention to.