Knauf DriTherm 37 Cavity Earthwool Slab

£19.95£34.95 Incl. VAT

Free delivery over £150 (Exceptions Apply)
Next Day Available | 30 Day Return Policy
Further Delivery Information


Earthwool DriTherm glass mineral wool cavity slabs are for the thermal insulation of masonry cavity external walls and are installed to fully fill the cavity. They are approved for use in buildings up to 12m high in any exposure zone and for use in multi-storey applications up to 25m in height.

Earthwool DriTherm Cavity Slabs are semi-rigid of non-combustible, water repellent, glass mineral wool. They are 455mm wide to suit standard vertical wall tie spacings, ensuring a closed joint with adjacent slabs.

Product Specification


  • Length: 1.2m.
  • Width : 455mm.
  • Thickness: 100mm.
  • Thermal conductivity : 0.037W/mK.
  • Thermal resistance: 2.7m2K/W.
  • Pack quantity: 8 x slabs.
  • Pack coverage: 4.37m2.


  • Length: 1.2m.
  • Width : 455mm.
  • Thickness: 75mm.
  • Thermal conductivity : 0.037W/mK.
  • Thermal resistance: 2.00m2K/W.
  • Pack quantity: 8 x slabs.
  • Pack coverage: 4.37m2.


  • Length: 1.2m.
  • Width : 455mm.
  • Thickness: 50mm.
  • Thermal conductivity : 0.035W/mK.
  • Thermal resistance: 1.40m2K/W.
  • Pack quantity: 12 x slabs.
  • Pack coverage: 6.55m2.



Earthwool DriTherm Cavity Slabs are certified by the British Board of Agreement Certificate 95/3212. Approval can be sought from Knauf Insulation Ltd and the British Board of Agreement for Earthwool DriTherm Cavity Slab’s use in buildings over 25m high.

Handling & storage

Earthwool DriTherm Cavity Slabs are easy to handle and install, being lightweight and easily cut to size, where necessary. They are supplied in polythene packs which are designed for short term protection only.

For longer-term protection on site, the product should either be stored indoors or undercover and off the ground. Earthwool DriTherm Cavity Slabs should not be left permanently exposed to the elements.

Knauf DriTherm 37 Cavity Earthwool Slab

Delivery Information

We have multiple delivery options

  • Next day carrier
  • 2-3 day carrier
  • Click & Collect from store


The cost of the carriage will be displayed before your final checkout. Free delivery is available on most items for orders over £150, exceptions do apply.


  • Orders will only be dispatched and delivered on weekdays.
  • Orders for the next working day delivery must be placed before 2 pm, this gives us time to pick and pack before the carrier arrives to collect.
  • We aim to dispatch all carrier delivered items within 48hrs, and all items delivered on our own transport within 5 days, Monday to Friday.
  • A dispatch email will be sent when your goods leave us, if delivery is by the carrier, this email will include tracking information. If your order is delayed for any reason, we will contact you.


We pride ourselves on our customer service but mistakes can happen. If you receive an incorrect or faulty item, please notify us within 30 days to arrange a refund, return or exchange.

Knauf DriTherm 37 Cavity Earthwool Slab