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Earthwool Dritherm 37 Standard 150mm 4.37m2

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Earthwool DriTherm Cavity Slabs are semi-rigid or rigid slabs 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. They 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.


  • Product is odourless, rot proof, non-hygroscopic,
  • Easy to handle and install,
  • Lightweight and easily cut to size,
  • Slabs knit together, thus eliminating air gaps between adjacent slabs,
  • Non-combustible,
  • Contain a water repellent silicone binder to stop water to pass through the slab and reach the inner leaf of masonry,
  • Does not sustain vermin and will not encourage the growth of fungi, mould or bacteria.
  • Virtually no vapour resistance, allowing water vapour to pass freely through the slab and therefore allowing wall to breathe,
  • No capillary action across the cavity or from below DPC level,
  • Free from CFCs, HCFCs and any other material with ozone depletion potential in its manufacture and content and represents no known threat to the environment.

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