Best Practices Climate Control Protecting Internal Finishes from Moisture: Why Construction Drying Needs to be Planned Before Fit-Out Effective construction drying starts before fit-out begins. By planning temporary heating, air movement and dehumidification early, project teams can manage moisture from wet trades, protect timber, flooring and internal finishes, and reduce programme risk. Starting while conditions are still relatively mild can also help projects achieve the required drying conditions more efficiently, before colder winter weather makes moisture harder to manage.