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Data Sheet:
Cavity Walls - Fully Filled Data Sheet

Information suitable for:
New build
  • Energy saving

Technical information

When complying with current Building Regulations and looking to build a traditional cavity wall, the construction should consist of an external skin of 102.5mm facing brick with a 100mm cavity fully filled with Knauf DriTherm 32 Ultimate cavity insulation and an internal skin of 100mm Celcon Standard aerated blocks.

Main_cavity_wall_fully_filled_beam_block

Above windows and doors install insulated cavity lintels. Cavity trays should be installed with weep vents incorporated within the external skin at 450mm centres.

There are no requirements for fire stops as Earthwool Dritherm products are completely non-combustible and fully fill the cavity.

Hints and Tips

Ensure cavity insulation batts are kept clean and dry during construction and any mortar that may fall on them is cleaned off.

Ensure mortar snots are removed from the cavity side of the brickwork/blockwork.

To further reduce the transfer of heat away from the inside of the building it is recommended that below the DPC the cavity is fully filled with 100mm PIR insulation reducing thermal bridging.

Ensure correct positioning and quantity of wall ties are incorporated within the wall construction.

Using a fully filled cavity will decrease the passage of sound through a wall in comparison to a partially filled cavity.

Cavity insulation within the gable walls should always be taken up to ridge level to future proof the property for the possibility of the roof void being used as a habitable space.

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