PART L

Last updated January 6th, 2026

Building Regulations — Performance Confirmation for Dacatie Insulated Cavity Closers

Dacatie Building Solutions confirms that their Insulated Cavity Closers, when correctly specified and installed, contribute to compliance with the applicable UK Building Regulations across England and Wales, Scotland, and Northern Ireland.

These performance characteristics are supported by independent verification and detailed in the Dacatie product technical information and BBA Certificate 98/3474.

Key Regulatory Requirements and Product Attributes

Thermal Performance — Part L (Conservation of Fuel and Power)
Dacatie Insulated Cavity Closers are designed to maintain thermal continuity at door and window reveals and typically exceed a thermal resistance equivalent to 0.45 m²·K/W, consistent with recognised industry methods such as current Accredited Construction Details.
Default linear thermal transmittance (psi) values from BRE Information Paper IP 1/06 (or its latest equivalent) can be used in SAP (England & Wales), iSBEM, or other energy modelling methods for compliance calculations.

Weather Resistance — Part C (Resistance to Moisture)
When installed in appropriate wall constructions, the products act as an effective damp-proof barrier and help resist the passage of water into the building in both flush and check reveal situations.

Structural Stability
Dacatie Insulated Cavity Closers provide adequate resistance to wind loading and are suitable for use throughout the UK when installed correctly.

Fire Safety — Part B (Fire Safety)
Standard Dacatie Insulated Cavity Closers will not significantly contribute to fire growth (Part B3). Where specified, fire-rated cavity closers can additionally function as part of a cavity barrier system where required by regulation and guidance.

Durability
The cavity closer profiles are protected within the wall cavity and, when installed correctly, are designed to perform over the normal expected life of the building.

Thermal Bridging and Psi Values

Dacatie products help maintain continuity of insulation at reveals, and where appropriate, designers can use published psi values (e.g., from BRE IP 1/06 Table 3) in carbon emission and energy compliance calculations. Correct window and door set-back (e.g., 30 mm or as specified) should be maintained to achieve expected performance.

Guidance and Regulatory References

Designers and installers should refer to the most recent versions of the relevant guidance for compliance:

England & Wales

Scotland

Northern Ireland

References to SAP (England & Wales) and SBEM (non-domestic UK) should be confirmed against current editions and methodologies at the time of design submission.

Summary

When correctly installed in accordance with the manufacturer’s instructions:

✔️ Dacatie Insulated Cavity Closers meet or contribute to meeting the relevant performance requirements of current UK Building Regulations for thermal performance, moisture resistance, structural stability, fire safety, and durability.

For the latest product information, compliance details, and technical support, please contact:

📧 [email protected]

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