Humidity and Mold in Coastal Jeddah Homes: Prevent It and Handle It Safely

Mold needs moisture before anything else. In coastal cities the air carries a lot of water vapour, and once it enters a sealed home and cannot leave, it settles into fabrics, wood and walls. The problem grows on days when humidity is high and there is little air movement.

Newer, tightly insulated homes can trap moisture more than older ones because the air inside is replaced slowly. Older buildings, meanwhile, may suffer seepage through walls, roofs or ageing pipes.

Running AC for many hours with doors and windows shut cools walls and glass, so warm humid air deposits water the moment it touches them. That is why mold often shows behind heavy curtains, behind furniture against an exterior wall and along window frames.

The AC itself can be part of the story: a blocked or badly sloped drain hose sends water back to the wall or lets it drip inside a false ceiling.

Many households keep spare rooms and storerooms shut for long periods, or avoid opening windows because of dust and heat. The result is stagnant air that holds its moisture. Wardrobes packed with clothes, shoes and bags add another layer, because fabrics and leather absorb damp and release it slowly.

The answer is not to leave windows open all day. Choose the drier hours, run the extractors, leave a small gap behind wardrobes and open closed rooms now and then to refresh the air.

Run the bathroom extractor during showers and for about twenty minutes afterwards, and use the kitchen extractor while cooking. Where there is no extractor, open a window or door slightly and keep the room door closed so steam does not spread through the home.

On less humid days open opposite windows for ten minutes so air can pass through. Wipe dust from extractor grilles as well, because clogged grilles lose suction over time.

Leave a small gap between furniture and exterior walls, and do not push wardrobes flush against a wall with no space behind. Inside wardrobes use moisture-absorbing sachets or boxes and replace them when full, and never store clothes that are not completely dry.

Air heavy upholstery weekly in dry weather and check behind sofas and beds that sit against walls. If upholstery has been washed, make sure it is completely dry before it goes back into place.

These are the two biggest moisture sources. Use a squeegee after every shower and inspect the silicone around basins and toilets, since cracks and peeling let water slip behind. In the kitchen dry the sink area and check there is no dripping beneath it.

About every three months look at the pipes under basins and the washing machine and at AC drain hoses; a small steady leak can feed mold behind a wall for months before it shows.

Wipe window sills, frames and tile joints every two weeks with a damp cloth and dry them, because mold in its first stage feeds on water and dirt together. A periodic deep clean two or three times a year reaches the corners that routine cleaning misses.

After dust storms, dust mixes with humidity and becomes a sticky film on glass and AC units; see cleaning a home after dust storms for the right order of work.