What cork spray is
Cork spray combines cork granules with a binder and is applied as a textured coating to a suitable surface. John works with TIWI CorkSpray for internal and external wall applications. The substrate must be assessed, prepared and compatible with the proposed system.
Cork has thermal and acoustic properties. The performance of an installed coating depends on its thickness, the binder, the background and the rest of the construction. It is misleading to transfer the performance of a thick cork insulation board to a thin spray coating. The specification matters.
What spray foam is
Spray foam is an expanding insulation material. Different formulations and installation methods have different characteristics. Broad labels such as open-cell and closed-cell do not provide enough information to establish whether a particular application is right for a wall or roof.
Any insulation proposal should identify the product, its intended use, the construction receiving it and the supporting documentation. Ask how moisture, ventilation, fire performance and inspection will be addressed. Those questions apply to the complete installation rather than the material name on its own.
Moisture is about the whole building
Vapour permeability describes how water vapour passes through a material. It is one part of moisture behaviour, alongside rain penetration, leaks, capillary movement, ventilation and temperature. A breathable finishing layer cannot make a whole wall safe if incompatible layers or active defects remain beneath it.
Neither “cork” nor “foam” is a diagnosis for damp. If a wall is wet, understand why before it is covered. Existing paint, mortar, render and insulation all influence how it dries. Older buildings may benefit from specialist advice where the construction or previous repairs are unclear.
Compare an actual specification
Ask each installer to describe the preparation, proposed layers, thickness, junction details and intended finish. If a thermal target is part of the project, ask how the complete construction has been assessed against it. A decorative coating should not be sold as the equivalent of a designed insulation upgrade.
Installer training and product certification are also different things. John’s certificate is for TIWI Accredited Cork Plasterer. It should not be presented as independent approval of every possible wall build-up. If your project requires particular certification, ask for the relevant product documents and professional advice.
Think about future inspection and alterations
Before covering any building element, consider how it will be inspected and repaired later. Ask where the treatment stops, what remains accessible and how future changes would be handled. Keep the agreed specification and documentation with the property records.
If a lender, surveyor or insurer needs to accept a proposed installation, obtain their advice for that specific system before proceeding. We do not promise a particular lending or resale outcome for any material. Requirements can depend on the property and the individual organisation.
A practical next step
If you are considering a cork finish for an internal room or exterior wall, John can assess whether it suits the surfaces. Start with your postcode, the existing finish and the change you hope to make. Conventional plastering or another render system may also be worth comparing.
Explore our cork plastering and cork rendering services, or read about what affects the scope of a cork project. Eco Coatings is based in Leeds and works UK-wide. The aim is a clear specification for your building, with time to ask questions before agreeing the work.