AIM Thermal Liner Units

Insulated liner units for improving the thermal performance of walls and manufactured from plasterboard bonded to insulation. AIM Thermal Liner Units are used to provide an insulated internal lining for walls and ceilings. They provide considerably enhanced insulation, improved sound reduction and a smooth plasterboard internal finish.

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  • Available with optional aluminium foil vapour barrier between plasterboard and insulation
  • Plasterboard satisfies the requirements of BS 1230
  • Surface of the plasterboard complies with Class O of the Building Regulations
  • Plasterboard is incombustible to BS 476 part 4, rated Class 1 Surface Spread of Flame to BS 476 part 7
  • Plasterboard achieves index of performance (l) not exceeding 12 and sub-index(i1) not exceeding 6 (both sides) to BS 476 part 6
  • The gypsum plaster facing material should not be used in continuously damp conditions or externally on a building
  • Global warming potential = zero


Choice of Insulation

Lamella (LAM)

Lamellas are made from high density rock wool slab, which is cut into blocks and rotated through 90 degrees before being bonded to the plasterboard.

Lamella rock wool is incombustible and is especially suitable for acoustic applications.

Extruded Polystyrene (XPS)

Small, closed cell extruded polystyrene for optimum insulation, high compressive strength and resistance to moisture.

Expanded Polystyrene (EPS)

Versatile expanded polystyrene for optimum value and light weight.

Polyurethane (PUR)

Polyurethane foam has very low thermal
conductivity and is particularly suitable for
applications where space is at a premium

Other insulation types can be supplied.

Specialist plasterboards are available please contact us for further information.




The ceiling lining should be in place prior to fitting AIM Thermal Liner Units. Wall mounted services must be installed to allow for the extra depth taken by the units. Where the Liner Units are being fitted to an existing building the surfaces should be relatively clean and free of flaking materials, especially if the adhesive fixing method is to be used. AIM Thermal Liner Units will not accept any structural fittings, so where these are required provision must be made to connect them to the structural support wall.

Adhesive Fixing

If the background is suitable AIM Thermal Liner Units can be directly fixed to the existing wall by a suitable gap filling adhesive or bonding compound. Suitable products are manufactured by Ardex, British Gypsum, Knauf, Redland, and others.

Certain surfaces, such as high density smooth concrete or high suction masonry may require priming. The adhesive manufacturer’s guidelines should be followed throughout. The adhesive should be applied in 200mm wide bands around the perimeter, and down the centre of the Units. The adhesive must be applied to the back of the Units to achieve a good key with the insulation, and should also be applied to the wall surface. The AIM Thermal Liner Units are then offered up to the supporting wall and tapped into position.

When the adhesive has hardened, secondary mechanical fixings are driven through the AIM Thermal Liner Units into the supporting wall. Two fixings are used at the top of the boards and three at the base, under the skirting board line.

Mechanical Fixing to Metal Framing

AIM Liner Thermal Units may be fixed using a proprietary frame system (offered by most plasterboard manufacturers). The bearing surface of the metal frame should be at least 50mm wide and should be fixed to the existing wall in accordance with the manufacturer’s instructions. The frame uprights should be positioned to coincide with the vertical joints between adjacent liner boards and also at the centre of each board, (i.e. at maximum centres of 600mm). The AIM Thermal Liner Units are then secured to the metal frame using self drilling screws designed for fixing plasterboard and sufficiently long to ensure 15mm penetration of the frame.

Fixing should be at a maximum of 200mm centres along all frame positions and at approx. 12mm from both long edges of the board. When the flatness of the final surface is critical, for example where ceramic tiles are to be directly adhered to the plasterboard, it is recommended that two metal studs are used back-to-back at the joints between adjacent boards. The extra bearing surfaces help to prevent any distortion of the insulation which may occur if the fixings are over tightened.

Mechanical Fixing to Timber Framing or Battens

All four edges of the AIM Thermal Liner Units should be supported by battens or timber framing and a further vertical support is required at the centre of the units. The battens must allow a nail penetration of at least 25mm and should be at least 50mm wide to allow sufficient bearing.

When the flatness of the final surface is critical, for example where ceramic tiles are to be directly adhered to the plasterboard, it is recommended that two timber battens are used back-to-back (or a single 100mm wide batten) at the joints between adjacent boards.

The AIM Thermal Liner Units are fixed by nails which must be long enough to allow at least 25mm penetration into the timber. Fixing should be at a maximum of 150mm centres along all batten positions and at least 12mm from the edges of the board. Nails should not be overdriven.

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