Living by the sea is a dream for many, but for a building, the coast is a hostile environment. Between the salt-laden air, driving rain, and high water tables, Sussex properties face damp issues that you simply don’t find further inland.
If you’ve noticed a musty smell or peeling paint in your coastal home, it’s important to identify which type of damp you are dealing with before spending money on the wrong “cure”.
1. Penetrating Damp: The “Driving Rain” Factor
In coastal areas like Shoreham and Brighton, rain isn’t just vertical—it’s horizontal. Winds from the English Channel force water into the smallest cracks in masonry or around window frames.
- The Sussex Context: Many of our local Regency and Victorian properties were built with “Bungaroosh” or porous brick. Over time, the protective lime render can crack.
- What to look for: Damp patches that appear on internal walls after a storm, often located near chimneys, windows, or where the roof meets the wall.
2. Salt Contamination (Hygroscopic Salt)
This is a “hidden” coastal problem. Sea spray carries salt that can settle into your brickwork. Even if you fix a leak, the salt left behind remains in the plaster. Because salt naturally attracts moisture from the air, your walls may look damp on humid days even if it isn’t raining.
- The Focus Advice: Standard damp-proofing often fails here. We often recommend specialist salt-neutralising treatments or replastering to ensure the wall can finally “dry out”.
3. Condensation: The Modern Conflict
To protect against the coastal wind, many homeowners install high-quality double glazing and draught-proofing. While this keeps the house warm, it can turn the building into a “sealed box”. Without proper ventilation, the moisture we create from cooking and showering has nowhere to go.
- The Shoreham/Hove Example: In our recent survey, we noted how modern living standards in older buildings require a careful balance of insulation and airflow (such as trickle vents or humidistat fans) to prevent black mould growth.
4. Rising Damp vs High Water Tables
In areas close to the River Adur or the Brighton seafront, the water table can be high. If your property’s Damp Proof Course (DPC) is old—or has been “bridged” by a new patio or flowerbed—moisture can be sucked up into the walls like a sponge.
- What to check: Look for a “tide mark” on the ground floor walls, usually no higher than one metre from the floor, often accompanied by crumbling plaster or salt crystals.
Three Steps to Protect Your Coastal Home:
- Clear your gutters: Salt and sand can build up in gutters quickly. A blocked hopper can cause massive water ingress during a Sussex downpour.
- Check your render: Look for a “bossed” or hollow-sounding render. If the outer skin is failing, the wind will drive moisture straight into the structure.
- Breathe: Ensure your property has adequate ventilation. Passive vents are often better than mechanical ones in older coastal buildings to allow the structure to “breathe” naturally.
Dampness is rarely caused by just one thing. It’s usually a combination of the building’s age, its location, and how it’s being lived in. If you’re concerned about damp in a property you are buying or managing, a professional survey is the only way to get a definitive answer.