Insulation for a better tomorrow



URSA TF Roll/Slab is designed to fit between the roof timbers at rafter level creating a warm roof space. The usual procedure for construction is;

  1. The roof trusses, sarking membrane (Type LR or Type HR), sarking boards (if applicable), tiling battens and tiles are all installed in the normal way in accordance with good practice and BS 5534.
  2. When using Type HR membranes there must be provision for a 50mm airspace ventilated from the eaves to the ridge. Proprietary eaves ventilators should be used to maintain a clear path from the eaves vents into the roof void. Type LR menbranes may not require ventilation of the roof space provided they are covered by BBA certification.
  3. Fit the URSA TF Roll/Slab between the rafters ensuring that there are no gaps between the rafters and between sections of insulation.
  4. Ensure there is sufficient drape in the sarking membrane to maintain drainage. If the rafter void is fully filled and the membrane is in contact with the insulation counterbattens must be used to ensure correct drainage. Also check with the membrane manufacturer for suitability in fully suported applications.
  5. Continue the URSA TF Roll/Slab into the dwarf (knee) walls to maintain contunuity of insulation.
  6. If required additional insulation may be added under the rafters to both enhance the thermal performance of the roof and to mask the thermal bridge effect of the rafters.
  7. The plasterboard ceiling, incorporating a vapour control layer (500g polythene or foil backed plasterboard) is installed, ensuring the VCL is correctly detailed and sealed.
  8. Ensure that the insulation continues over the wall plate to maintain continuity with the wall insulation and is tight against any eaves ventilator units.
  9. Ensure that any penetrations through the ceiling, especially if formed by following trades, are correctly sealed to ensure an air and vapour tight ceiling.