Materials for coastal humidity and salt air
Near the sea, salty air and humidity speed up corrosion and the deterioration of many materials. Choosing well from the start reduces maintenance. These are general recommendations; the final specification comes from the design and each manufacturer’s data sheet.
Metals and fasteners
- Unprotected steel rusts quickly on the coast. Prefer hot-dip galvanized or stainless steel fasteners.
- Among stainless steels, type 316 resists the marine environment better than 304.
- Avoid putting dissimilar metals in contact (for example aluminum and steel): galvanic corrosion damages them.
- On zinc roofs, use screws with sealing washers and follow the gauge and coating the manufacturer recommends.
Concrete and rebar
Rebar protection depends on the concrete cover, a good mix and proper curing. Those values are specified by the engineer; don’t reduce them to save money. Rust stains on a slab are a sign to ask for an evaluation.
Roofs, sealants and paints
- Elastomeric coatings for concrete roofs, applied with the specified number of coats.
- Exterior masonry paints that let the wall breathe.
- Exterior-rated caulks and sealants around windows and doors.
Inside the house
Cross-ventilation, exhaust fans in bathrooms and kitchens, and preventing leaks are the best defense against mold.
Maintenance
- Rinse exposed metal surfaces with fresh water from time to time to remove salt.
- Check roof and window sealing before hurricane season.
- Deal early with any rust stain, crack or lifting paint.
Check the materials list with prices from Puerto Rico hardware stores, with the date they were checked.
The online estimate is free and preliminary. The official quote, with a visit from a Cruz General Contractors professional to measure and inspect, costs $25. That $25 is credited to the job total when the work is done with Cruz General Contractors. Nothing is charged on this site.