Unilin Close-R fully insulated cavity closers are a solution for builders and specifiers for the closing of cavities around window and door openings, preventing cold bridging, damp penetration, air infiltration and condensation.
The Close-R range is used to close cavities and is suited to all types of windows and doors and is available in sizes to fit cavity widths from 100mm – 150mm, with checked detail to suit brick or drylined specifications and flanged detail to suit block outer facings. (Flanged detailing requires precise construction tolerances).
Unilin Close-R fully insulated cavity closers are a solution for builders and specifiers for the closing of cavities around window and door openings, preventing cold bridging, damp penetration, air infiltration and condensation.
Where can you use Insulated Cavity Closers?
The Close-R range is used to close cavities and is suited to all types of windows and doors and is available in sizes to fit cavity widths from 100mm – 150mm, with checked detail to suit brick or drylined specifications and flanged detail to suit block outer facings. (Flanged detailing requires precise construction tolerances).
You can always create an insulated system with PIR. PIR insulation has a low thermal conductivity, delivering enhanced thermal performance and allowing significantly thinner installations compared with alternative insulation materials such as mineral wool
What Insulation is the Close-R Cavity closer?
The Close-R range is made of PIR or Polyisocyanurate insulation. It is afoam insulation, used to insulate cavities closest to the areas where thermal bridging could fail, like window and door openings.
PIR Insulations is considered an upgrade to PUR. PU solutions are characterised bytheir fine closed cell foam structures. The fine microstructure forms a strong insulating barrier, which greatly impedes the conduction of heat (and cold) and is an efficient insulation choice.
What is Close-R Flanged?
An insulated cavity closer ‘Close-R’ is a building component designed to seal and insulate the cavity around window and door openings in masonry walls. It helps prevent thermal bridging, damp penetration, air leakage and condensation, improving the overall energy efficiency and durability of a property.
A ‘Flanged’ Close-R insulation piece is a specifically designed featuring an integrated flange that ensures a secure mechanical fixing to masonry walls
What is Close-R Checked?
An insulated cavity closer, such as Close-R Checked, is a high-performance building product designed to seal and insulate wall cavities around window and door openings in masonry construction. Including Cavity closers in your build help to prevent thermal bridging, moisture ingress, air leakage and condensation, helping to improve a building’s energy efficiency, airtightness, and long-term durability. A Checked Close-R insulation piece is specially designed to incorporate a pre-formed rebate (or “check”) to accommodate window and door frames. This design ensures a secure fit, improved airtight seal, and improved thermal performance around openings, making installation faster and more precise for builders and contractors
How does PIR work?
PIR insulation works by reducing the transfer of heat through a building’s walls, roofs, floors, and other structural components.
Heat conduction and lambda value
in the image below, the heat passes through the saucepan easily, allowing food to cook. whereas, with PIR insulation, heat doesn’t pass through easily, meaning it is a good thermal insulator.
As it has a low thermal conductivity it is difficult for heat to pass through it, which makes it is such a good insulator.
Unilin Insulation also offers a Safe-R, Close-R insulation solution that places strong emphasis on fire performancewithin the Cavity closer.
A low lambda value(Thermal conductivity) results in a high R-value or thermal resistance, a measure by which we assess specific insulation products in relation to their insulation thickness. This thermal resistance quantifies the area and temperature difference needed to transfer 1W of heat energy. The higher the R-value, the lower the amount of heat loss.
The low lambda value of PIR means that anyone working with the product can insulate a building comfortably thanks to its thickness while optimising the energy performance. With PIR, you can make the most efficient use of the space available to you. Since you need less insulation material overall, this is the definition of a smart investment.
PIR insulation and thermal bridging
To further minimise heat loss and reduce the risk of both surface and interstitial condensation, careful detailing during insulation installation is essential. Our cavity wall insulation solutions incorporate engineered tongue-and-groove or rebated edge profiles, which help to reduce thermal bridging, improve continuity of insulation, and enhance overall airtightness. The product range includes XT/CW T&G, XT/CWP T&G, CavityTherm, and Cavityfill systems. Additionally, pre‑formed corner boards are available to further reduce heat loss at corner junctions, where thermal bridging commonly occurs. These product ranges can also be used in conjunction with Unilin Insulation cavity closer products.
Thermal bridging within the building fabric can account for up to 30% of total heat loss. Ensuring continuity of insulation, so far as is reasonably practicable, is therefore critical and can significantly reduce heat loss, improve thermal performance, and lead to meaningful reductions in energy bills. While controlling thermal bridging and ensuring correct installation of insulation are critical, airtightness and ventilation must work hand in hand. Everyday activities within the home—such as cooking, showering, drying clothes, and even breathing—generate moisture and airborne pollutants, creating humid and potentially unhealthy internal air. Without adequate ventilation, this moisture can accumulate, increasing the risk of condensation, mould growth, and deterioration of the building fabric.
Simple installation is guaranteed with PIR
Fire rated Unilin Close-R (FR)
The Unilin Close-R (FR) Fire rated closer by Dacatie, comprises a PVC-U outer profile with encapsulated insulation. It forms a continuous fire rated insulated cavity closer providing a minimum 30 minute integrity and is covered by BBA Certificate 98/3474.
Using Unilin Insulation Close-R in your project can help to achieve:
