How To Install


General instructions

  • Protective clothing is not required when handling TLX Silver
  • TLX Silver can be installed either way up.
  • Bare electrical wiring must not be allowed in contact with TLX Silver. PVC coated electrical wiring to normal domestic items such as light fittings may come into contact with TLX Silver.
  • If electrical cables are surrounded by insulation they may need to be de-rated and guidance should be sought from a qualified electrician.

Installation below rafters

  • The left hand side of TLX Silver is fixed in place with staples or nails of at least 14mm, and the TLX Silver rolled across the rafters as tightly as possible. The product is installed horizontally, either from ridge to eaves or from eaves to ridge.
  • Each layer of TLX Silver must overlap the previous layer by 50mm, and the overlap should be taped to give an airtight seal.
  • TLX Silver is permanently held in place by battens and plasterboard is fitted. The battens should be the correct size and spacing to support the plasterboard chosen.
  • Standard plasterboard can be used – foil-backed plasterboard is not required


  • The easiest way to cut TLX Silver is with a pair of sharp carpet fitters scissors. It can also be cut using a sharp knife with the TLX Silver resting on a board.
  • Pieces which have been cut should be stapled and battened as soon as possible, and should not be left unsecured overnight.
  • Small pieces (such as around Velux windows or in dormer cheeks) should be taped in place, stapled and battened immediately.
  • Any small tears or holes should be repaired with tape.


  • Where TLX Silver requires taping, it is recommended that Unibond Power tape is used.

Air layers

  • Unventilated air layers form an important part of the TLX Silver system. If the air spaces are omitted, whilst there is no danger of condensation, the overall thermal performance of the structure will decrease, and the U-value will be higher. Additional insulation may be needed to achieve the desired U value for the roof.
  • The ideal depth of an unventilated air layer in the TLX system is 15-20mm.

Additional insulation

  • Install additional insulation according to the manufacturer’s instructions.
  • Provide for air gaps between TLX Silver and additional insulation as required.


  • TLX Silver rolls must be stored on a dry flat surface, protected from the weather and direct sunlight.
  • Make sure when installing TLX Silver that it does not come into contact with heat sources above 80°C.

Vapour control and ventilation

  • A vapour control layer is not required for any of the recommended solutions with TLX Silver below rafter or inside wall studs.
  • When TLX Silver is installed above rafters, a good vapour barrier such as a polythene sheet must be fitted below the rafters.
  • A well-sealed ceiling is essential to prevent large amounts of water vapour from entering the roof space through air movement.
  • Ventilation of the rafter space is not needed if a breathable roofing membrane has been used. If a non-breathable, or type 1F felt is in place, then a 50mm ventilated space below the felt is required.
  • Ventilation of the space between the breather membrane and the outer roof covering is not required for air-open coverings such as clay or concrete tiles and rough natural slates. Fibre cement slates and sealed roof coverings such as metal roofs require additional ventilation of this space.
  • If in any doubt about possible harmful condensation, contact TLX Insulation Ltd for guidance.


For information on suitable tapes, cutters and scissors please phone the thermal hotline 01204 674 730 for advice.


TLX Silver Technical Data Sheet

TLX Silver Installation Instructions

Made in Britain