25mm Unilin Thin-R XT/CW PIR Cavity Insulation Board is used in traditional masonry walls, built to the highest thermal standards whilst maintaining a residual cavity, offering protection from wind driven rain.

Unilin Cavity Wall (T&G) tongue and groove jointing offers a practical onsite solution that results in a more robust, continuous layer of insulation, minimising the Thermal Bridging and improving the U-Value of the wall.

The recommended residual cavity width required is 50mm in accordance with Building Regulations, however, a reduced cavity may be permissible in certain circumstances.

The low emissivity foil facing on Thin-R Unilin XT/CW (T&G) improves the thermal performance of the wall.

The residual cavity is the most effective method of preventing wind-driven rain penetrating a wall from the outside.

A residual cavity is the air space that remains when Cavity Wall insulation is placed against the inner leaf of the cavity of a wall.

ACDs must be followed to ensure that installation is in accordance with current Building Regulations and accounted for in the energy calculation.

Unilin XT/CW Partial Fill Cavity Insulation can be used as a cheaper alternative to Celotex CW4000, EcoTherm, Recticel Eurowall and Kingspan.

Specification:

Thickness: 25mm

Length: 1200mm

Width: 450mm

Size: 25mm x 450mm x 1200mm

Board coverage: 0.54m2

Pack coverage: 10.80m2

Density (Foam Core): 30Kg/m3

Weight: approx. 11.97kg

Thermal Conductivity: 0.022W/mk

R-Value: 1.14m2K/W

Commpressive Strength: >120 (kPa)

Water Vapour Resistivity: >100 MNs/gm

Surface spread of flame: Class 1

Reaction to fire: E

Unilin Thin-R XT/CW PIR Cavity Board Features:

· BBA Certified.

· Reduced Thermal Bridging.

· Clear Cavity Maintained.

· No Exposure Restrictions.

· Low Emissivity Foil Facings.

· Robust Tongue and Groove Jointing.

· Corner Panels and Cavity Closers.

· Certified Thermal Conductivity of 0.022W/mk.

· In accordance with current Building Regulations.

· Offering protection from wind driven rain.

· Offering continuous layer of insulation.

· Improving the U-Value of the wall.

Unilin XT/CW Partial Fill Cavity Insulation Istallation Guidelines:

 · Under PD 6697:2019 Recommendations for the design of masonry structures to BS EN 1996-1-1 and BS EN 1996-2.

 · It is recommended that no more than four courses of block are laid on the preceding skin before installation of the insulation.

 · This allows for wall ties to be inserted accurately and without bending and thus distorting the physical characteristics of the wall ties.

 · Ensure the wall is level and free of any protrusions before installing the insulation with all edges tightly interlocked.

 · Mortar should be struck from the inner cavity face of the block to ensure mortar squeeze is minimised on the cavity side.

 · The inner and outer courses can then be built.

 · Insert wall ties maximum 600mm centres one block course below DPC.

 · Wall ties should incorporate retaining clips, be Agrément approved and conform to BS EN 845-1: 2013 + A1: 2016.

 · Secure cavity boards tight against inner leaf with retaining clip on wall ties.

 · Excess mortar should be removed from the inner leaf to ensure a tight fit against blockwork.

 · Boards should be installed with the tongue uppermost and joints should be tightly butted.

 · Ensure a minimum 150mm overlap with the floor insulation.

 · The receiving block should be plumb to provide a flat surface to accept the insulation.

 · As with setting out, installation should commence from adjacent corners using the Cavity Wall pre-formed corner boards.

 · Alternate corner boards will achieve the offset break bonded pattern for the insulation.

 · Maintain a 50mm residual cavity to suit all exposure zones.

 · In isolated circumstances, where the cavity is obstructed, a minimum 25mm residual cavity should always be maintained and extra consideration should be given to fixings and weatherproofing.

 · Any reduction in cavity width should be agreed with Building Control.

 · Place wall ties at maximum 900mm x 450mm centres, securing with a minimum of 3 wall ties per board.

 · Ensure block joints are fully bonded with unbroken mortar.

 · Fix wall ties 225mm vertically and 150mm horizontally from face of unbonded jambs.

 · Ensure wall ties and cavity are kept clean of mortar.

 · Wall ties should be sloped downwards towards outer leaf.

 · A cavity board should be used to keep the cavity clean.

 · Cavity Wall corner boards and cavity closers may be fitted to provide robust detailing.

 · Newly erected masonry should be covered to protect the insulation and to prevent the mortar being washed out of the joints by rain.

 · Walls should be prevented from becoming saturated by covering the top of the wall with waterproof sheets; this is particularly important to minimise the incidence of efflorescence and lime bloom.

 · When any working platform is not in use, the inner board should be turned away from the wall to prevent the splashing of the wall face.

Unilin XT/CW Cavity Insulation Certification:

· BBA Certification No. 08/4613.

· BS EN ISO 9001 Quality Management System.

· BS EN ISO 14001 Environmental Management System.

*Further information may be found in our Downloads section.

Fairly easy access to all PDF files.

Datasheet ǀ Declaration of Performance - DoP ǀ BBA Certificate ǀ Installation Guide ǀ Certificates ǀ Brochure ǀ SPEC Sheet 

*Special Product - Non returnable cancelable.