Swimming Pool Condensation: How Spray Foam Protects Pool Buildings

Swimming pool buildings have the most extreme humidity conditions of any commercial building type. Warm pool water constantly evaporates, creating a high-humidity environment that attacks every surface — steel corrodes, timber rots, paint peels and condensation drips from ceilings into the pool. Proper insulation is the first line of defence.

Why Pool Buildings Get Condensation

Pool water at 28-32°C continuously evaporates, raising the air humidity to 50-70% or higher. When this warm, moisture-laden air contacts cold surfaces — roof structure, walls, steelwork — it condenses instantly. In uninsulated or poorly insulated pool buildings, every cold surface becomes a condensation factory.

How Spray Foam Controls Pool Condensation

• Vapour barrier — Nexseal LE closed-cell foam prevents warm moist air reaching cold structural surfaces
• Thermal barrier — raises surface temperatures above dew point so condensation cannot form
• Corrosion protection — steelwork sealed behind spray foam is protected from the corrosive pool atmosphere
• Energy savings — pool operators typically report 20-40% reduction in heating costs

Open-cell spray foam should NOT be used in pool environments — its breathable structure allows moisture to pass through, defeating the purpose. Only closed-cell Nexseal LE provides the vapour barrier that pool buildings demand.

Read our complete guide to swimming pool spray foam insulation covering leisure centres, hotel pools, hydrotherapy facilities and school pools. Email info@duratite.ie for a free pool building survey.