Ribs and junctions
Decide how the specification treats ribs, cabin-to-roof junctions, doors and windows. A coating over broad panels does not automatically resolve every thermal bridge.
Commercial spray foam experts · Duratite Group
Narrowboat Spray Foam Insulation & Refit Planning
Spray foam insulation for narrowboat shells and accessible refits, with careful detailing around ribs, openings and cabin services.
Discuss your project →A specification built around your application
The limited width of a narrowboat makes the finished build-up important. Insulation thickness is only one component: battens, cable routes and linings also affect cabin dimensions. Define the complete fit-out before deciding the insulation scope.
A bare shell allows the installer to see the substrate and plan coverage. An existing narrowboat may need sections opened for assessment. The condition of steel and coatings, access to fittings and the vessel’s ventilation requirements should guide the decision.
What shapes the insulation specification
Services and maintenance
Identify inspection points and routes for wiring, plumbing and heating. The insulation should be coordinated with planned maintenance rather than conceal components that need access.
Refurbishment scope
Explain which linings can be removed and whether previous insulation is present. Existing foam, corrosion or unidentified coatings may need further investigation before new work.
Application photographs
Selected from the Duratite application library.
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
Narrowboat Insulation & Refit Planning questions
Can new foam be sprayed over old narrowboat insulation?
Do not assume that overlaying is suitable. The existing material, adhesion, moisture and underlying hull condition need assessment before specifying repairs or replacement.
Will insulation stop every cold spot?
No universal claim is appropriate. Continuity and junction design matter, while windows, doors and untreated metal can still influence surface temperatures.
What affects the cost of narrowboat insulation & refit planning?
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.
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