Timber and moisture
Check damp, decay and the condition of supporting timbers before proposing a treatment. The design must consider ventilation and the ability to inspect vulnerable areas.
Commercial spray foam experts · Duratite Group
Commercial Floor & Underfloor Spray Foam Insulation
Insulation for accessible floor undersides and voids, specified around floor construction, ventilation, services and maintenance.
Discuss your project →A specification built around your application
A suspended timber floor, concrete slab and metal deck each need a different assessment. Before discussing foam, establish the construction, the condition of the floor and what lies beneath it. Access to the underside can be the main practical constraint.
The insulation should form part of a defined floor build-up. That includes how it meets walls and supports, how moisture is managed and which services or ventilation paths must remain accessible. A poorly understood void should be investigated before it is covered.
What shapes the insulation specification
Services and access
Map wiring, pipework, valves and inspection points. Plan whether sections need to remain clear and how the installer can safely reach the required surfaces.
Floor performance
Provide the thermal target and intended use above and below the floor. Junctions, protective finishes and the complete construction matter alongside foam thickness.
Relevant project experience
Duratite project library
Pondswick substation, Luton
This accessible concrete-soffit project shows how the underside of a slab was insulated and finished. Read the documented substrate, system and installation sequence; timber floors and concealed ceiling voids require a different assessment.
Read the project case study →From project brief to installation
Share the brief
Send photographs, dimensions, site location and the intended use. Include known defects and the outcome you need, such as reducing heat loss or addressing cold-surface condensation.
Assess the construction
The survey establishes the accessible substrate, preparation, moisture conditions and practical installation scope. Drawings and existing records help resolve interfaces with other parts of the building or vessel.
Agree the scope and price
Compare the complete work package: preparation, insulation, protective finish, access and reinstatement. Agree responsibilities and the programme before the work begins.
Record the completed work
Arrange inspection before the insulation is concealed. Keep the agreed specification, product details and installation records with the asset’s maintenance information.
Understand commercial spray foam costs · Compare insulation approaches
Floor & Underfloor Insulation questions
Can you spray any suspended timber floor?
No universal approach is appropriate. Timber condition, ventilation, ground moisture and the proposed build-up need assessment before selecting a system.
Will insulation block the underfloor vents?
Required ventilation routes must be considered and preserved by the design. They should not be blocked as an improvised way to stop draughts.
What affects the cost of floor & underfloor insulation?
The treated area, substrate condition, specified thickness, preparation, access equipment and finish all influence the price. Include the work programme and any removal or reinstatement in the enquiry so quotations cover the same scope.
What should be agreed before installation?
Confirm the product and application, prepared substrate, intended thickness, junction details, protective finish and access arrangements. Ask for the relevant product information, installation records and the specific terms of any proposed warranty.
Free survey
Get a quote for your project
Send us your building details and our technical team will specify the right system and a clear budget. No obligation.
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25-yr product warrantyDocumented, surveyor-ready installs