Structural drying is a multi-step, science-based process that removes moisture from building materials after a water damage event…
Whether it’s from flooding, leaks, or storm damage, the goal is to safely and efficiently dry timber, concrete, plasterboard, insulation, and subflooring – “the structure” – back to pre-loss condition — without tearing everything apart unnecessarily.
(Information source: ACRA – Australian Cleaning & Restoration Academy)
Structural drying is a science (and art!)
At a technical level, structural drying is the management of vapour pressure differentials. The fundamental principle involves creating a low vapour pressure environment in the air adjacent to materials that have high vapour pressure due to absorbed moisture. This differential encourages moisture migration from the material (where it’s not wanted) into the air (where it can be controlled and removed).
When executed correctly, drying is not just about moving air—it’s about manipulating the environment to drive vapour back into equilibrium.
What does structural drying involve?
Structural drying is a multi-step, science-based process that includes the following core elements:
1. Water extraction
- The first and most urgent step.
- Uses commercial-grade extraction tools (e.g. truck mounts, portable extractors, flood pumper, wet vacs, water claw) to remove standing water and as much water as possible from carpets, floors, and porous materials.
2. Moisture detection & mapping
- Using moisture meters, thermal cameras, and hygrometers to locate moisture in walls, floors, and hidden spaces.
- Establishes a drying goal and provides a benchmark to measure progress throughout the drying process.
3. Air movement
- High-velocity air movers are used to promote evaporation.
- Helps release moisture trapped in structural materials into the air, which can then be removed via dehumidification.
4. Dehumidification
- Dehumidifiers remove water vapour from the air to prevent secondary damage like mould growth and warping.
- Types used include LGR (Low Grain Refrigerant) and desiccant dehumidifiers, depending on the environment and job scope.
5. Heat drying 
- Heat is used to accelerate evaporation and increase drying efficiency, especially effective in colder or hard-to-dry environments.
- Heat drying systems (such as Drymatic) allow for targeted drying of difficult areas like behind walls or under floors.
- By raising temperatures, technicians can drive moisture out of dense materials more effectively.
6. Temperature control
- Maintaining the right temperature increases evaporation rates and enhances the performance of air movers and dehumidifiers.
- Professional drying requires the correct balance between heat, airflow, and dehumidification.
Why is Structural Drying Important?
Prevents Mould Growth: Mould can develop within 24–48 hours in moist conditions.
Preserves Building Materials: Rapid drying helps avoid costly repairs or replacements.
Reduces Downtime: Especially critical in commercial settings where business continuity is at stake.
Expand your Skills:
Training opportunities in Structural & Heat Drying
Looking to add value to your business and gain a competitive edge in water damage restoration?
Cleaning Systems’ Ascend Training, in partnership with the Australian Cleaning & Restoration Academy (ACRA), is offering specialised training designed to give restoration professionals in New Zealand the knowledge and skills they need to master both Structural Drying and Heat Drying.
These courses are ideal for restoration technicians, insurance professionals, building inspectors, and business owners looking to expand their service offerings and stay ahead in a competitive market.
Equip yourself with industry-leading knowledge and transform your restoration results.
Upcoming Courses:
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