Lack of air circulation in the attic leads to condensation, especially in older houses with natural ventilation.

In houses with natural ventilation and insufficient supply air vents, negative pressure can occur, drawing even more humid air into the attic through leaks in the floor structure or ventilation ducts.

Additional insulation prevents heat from rising to the attic, making the attic colder. Cold air holds less moisture, which increases the risk of condensation on cold surfaces such as roof trusses and insulation.

Water vapour rises from the ground and increases the humidity in the crawl space, especially if the ground is covered with soil or lacks a functional moisture barrier.

Poor or insufficient ventilation means that moisture remains, creating an environment where mold can thrive.

Cool air in the crawl space meets warm, humid air from the surroundings, leading to condensation on cold surfaces such as joists and walls.

Ventilation and airflow check. Inspection of ceiling joists and insulation for signs of moisture, mold, or condensation.

Indoor ventilation assessment. Checking for signs of poor air circulation, such as condensation on windows or stale odors. Recommendations for improving airflow and indoor climate.

Moisture content check of the ground and the need for a moisture barrier. Inspection of floor structures and insulation for mold, rot, or condensation. Assessment of ventilation and risk of stagnant moist air.