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We use two main types of dehumidifiers as part of our building drying process, both of which are industrial grade drying machines. The first is a desiccant dehumidifier which uses a special disc covered with a highly absorbent chemical that essentially draws the water out of the air before dispensing it into a water tank, or pumping it outside. Warm, dry air is then blown back into the property. Alternatively, we use a refrigerant dehumidifier which uses a refrigerated coil. As the wet, warm air blows across the refrigerated coil, it cools allowing the moisture to condense and drip into a water storage tank. The machine then pumps the water outside or into an internal drain. The machine reheats the dry air and pumps it back into the property.

Different building drying machines work best in different settings and stages in the drying process. Temperature, materials, and the construction of the property are all factors to consider when choosing how to dry the building. The refrigerant dehumidifiers work best between 15-30 degrees and when there is still surface water present.  It is also a gentler drying process which is especially important in listed buildings where there is old timber and old plaster which is susceptible to shrinkage and cracking due to over drying. The desiccant dryer works well at all temperatures and is more suited to drying bonded water which is absorbed into building materials such as concrete and plaster.


To ensure a building is dried properly, airflow must be carefully maintained throughout the process using specialist air movers. When we are still removing surface water you will need a high velocity air mover. As the water dries off surfaces, the rate of drying slows down. The remaining water is absorbed into the pores of building materials, fixtures and fittings. At this point you need a reduced air flow and a heat source to encourage evaporation. The final stage of drying has to draw any remaining absorbed moisture back to the surface as vapour. We achieve this with yet another change in the specialist drying techniques and equipment.

Injection Drying: also known as pressure drying, this method injects pressurised warm, dry air into wet wall and floor voids. It uses hoses connected to pre-drilled holes in the construction walls and slab.

Injection Expansion Gap Plate Drying: this method of drying injects warm air directly into expansion gaps, avoiding the need to drill into your structure.

Heat Mat Drying: this drying system for walls and floors distributes dry, warm air evenly across water damaged materials. It encourages moisture trapped in building materials to evaporate, while the airflow simultaneously helps to remove damp air.

Mobile High Volume, Low Humidity and Hot Air Plant: our specialist equipment quickly pumps a large volume of hot, dry air into your property. Faster evaporation then advances the structural drying process, and the damp air is either removed by dehumidifiers or replaced with fresh air.

Specialist construction drying services

If water damage is holding up work on your construction site, you need to speak to an expert building drying company like us. With a number of highly trained, DBS-cleared and insured technicians, we can get you working again. Our people are here for your water damaged new build or listed building 24/7, 365 days a year!

Advanced construction drying equipment

Drying out water damage is always a specialist job. Traditional drying methods might not always be the right ones for your building. The wrong method can actually cause extra damage. To avoid extra construction damage, our trained staff will choose the best construction drying solution from our option listed above.

Water damage in a new build property or listed building

First, we will look at where your water damage came from. This is an essential step in choosing the most appropriate water damage drying method and equipment. Some water sources contain high levels of harmful bacteria or fungi which can cause severe sickness. Different buildings have different structural drying needs. Older buildings often do not have waterproof layers and will have old plaster and timbers. Modern buildings on the other hand probably have insulation in the walls and slabs. Our experts will look at what construction drying method is best for your specific structure. If you have a listed building any structural drying method must be approved by the Conservation Officer. We have extensive experience in flood damage building drying in listed properties and we are used to working within conservation requirements.

Water damage at home, in hospitals, restaurants or offices

For every kind of structure affected by water or flood damage, CPL t/a Rainbow Restoration has the right structural drying equipment. Buildings used for different purposes demand different drying methods to reach the required sanitary and air quality. Whether it’s your home, hospital, restaurant or office that has sustained flooding, CPL t/a Rainbow Restoration has the expertise and the methods to help you. Years of solid experience with some of the UK’s leading construction companies mean we can provide the right solution, promptly and with confidence!

Case Study

Water Damage Restoration, London

We provided an efficient bespoke drying regime, following a leak at a new office development We saved the customer thousands of pounds by avoiding the need for complete strip-out and reinstatement.

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