Collection: Cavity Closer Plus
Kingspan Kooltherm Cavity Closer is PVC–U extrusion with a fibre free rigid thermoset insulation core that maintains continuous insulation around window and door openings. It is suitable for use with timber, metal or PVC window frames and can also be supplied to order in curved sections.

9 products

Cavity Closer Plus | Fire-Rated Cavity Closer | Cavity Closer

The Cavity Closer Plus category on Insulation4less boasts a diverse array of cavity closer products designed to ensure efficient insulation around window and door openings. This guide will provide an in-depth look at these offerings, elucidating their practical uses and offering guidance on the most apt choice for specific applications.

What is Cavity Closer Plus?

Cavity Closer Plus is a pre-formed, insulated profile designed to close the cavity around window and door reveals in traditional masonry walls. It acts as a thermal break, prevents cold bridging, and provides a clean, rigid edge for internal plaster finishes. These closers also help meet building regulations by offering fire resistance, moisture control, and energy efficiency in new builds or refurbishment projects.

Thermo Loc Platinum Plus Series

These products provide superior insulating properties. Let's delve into the different types available:

Standard Cavity Closers: This line, like the Thermo Loc Platinum Plus Cavity Closer 2.4m, is ideal for general applications and offers a balance between performance and cost.

FX Check Reveal Cavity Closers: Products such as the Thermo Loc Platinum Plus FX Check Reveal Cavity Closer 2.4m come with enhanced features that are suitable for more specific installation requirements.

ARC Smart Closer Plus Series

The Smart Closer Plus products by ARC are known for their advanced design and adaptability:

Standard Smart Closer Plus: Suitable for a myriad of applications, this variant offers consistent performance across the board.

Single Flange: The Smart Closer Plus Single Flange is designed for specific use cases where a single flange design is preferable.

ARC Eco Closer Plus

Prioritising cost effectiveness without compromising on quality, the Eco Closer Plus is an affordable choice for projects on a budget.

Kingspan Kooltherm Cavity Closer

This product is a standout, constructed with PVC U extrusion coupled with a fibre-free rigid thermoset insulation core. This design ensures seamless insulation around window and door openings. It's versatile and can be paired with timber, metal, or PVC window frames. For those who prioritise ease of installation, the Kingspan Kooltherm Cavity Closer PLUS is a prime pick. It consists of preformed sections, significantly cutting down installation time.

Selection Guidance

When picking the right cavity closer for your project, consider the following:

  • Application: Understand the specific requirements of your project.
  • Budget: Products like the Eco Closer Plus are designed for cost-effective solutions, while others might offer advanced features at a premium.
  • Ease of Installation: Preformed options, like the Kingspan Kooltherm Cavity Closer PLUS, can save installation time.

Benefits of Cavity Closer Plus

  • Thermal Performance: Minimises heat loss around reveals and improves overall energy efficiency.
  • Fire Protection: Options available with up to 120 minutes of fire resistance for increased safety compliance.
  • Moisture Control: Integrated DPC prevents damp ingress and protects internal finishes.
  • Quick Installation: Pre-formed shapes and easy-trim grooves reduce fitting time on site.
  • Multi-Frame Compatibility: Suitable for timber, uPVC, and metal window/door frames.
  • Acoustic & Mould Resistance: Helps reduce noise transmission and prevents condensation-related issues.

Applications of Cavity Closer Plus

  • Around window and door openings in masonry cavity walls
  • Suitable for residential, commercial, and public buildings
  • Ideal for new build construction and retrofit upgrades
  • Used in fire-rated builds, where additional protection is essential
  • Effective for cavity widths ranging from 50mm up to 300mm

Installation Tips

  • Measure your cavity width accurately to select the right size closer.
  • Cut to length on-site using integrated guide grooves (typically supplied in 2.4m lengths).
  • Install with the plastic flange facing outward, flush to the external brickwork.
  • Fit with frame ties or brackets if needed to secure the profile.
  • For fire-rated closers, ensure installation follows manufacturer guidance for maximum protection.
  • Always allow for sla ight overhang at the head and sill for trimming or movement.

Why Choose Insulation4Less?

  • Trusted brands like Timloc and ARC in one place.
  • Competitive prices and bulk-buy savings for trade and DIY customers.
  • Fast nationwide delivery and responsive customer support.
  • Expert advice from a dedicated insulation team.
  • All products meet UK Building Regulations.
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