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Solid Floor Constructions

Screeded Floors - Solid Base

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Screeded floors are laid onto a solid sub-base, which will either be a solid sub-base, block & beam or plank (bison beam) construction. This section refers to solid sub-base construction.

BS 8204 requires the level of the solid sub-base to be better than 3mm under a 2m straight edge.

If the solid sub-base is uneven the insulation will bridge the undulations and when the screed load is applied the insulation may collapse causing the screed to crack. (See Below)

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Tamped bases may require a regulating layer prior to the insulation being placed.

The screed thickness is determined by the type of screed to be used as well as the type of underfloor heating system to be installed.

The construction of the floor above the solid sub-base inclusive of the USL Underfloor Heating System will be the same for the block & beam and planked sub-base constructions.

A Damp Proof Membrane (dpm) is normally included below the floor insulation.

A layer of floor insulation is laid on top of the sub-base, this must meet the U value requirements for Building Regulations as well as the structural requirements for the specific building application.

USL 16mm pipework is stapled onto the insulation with plastic barbed clips at designed centres.

The screed is then laid to the specified requirements and appropriate British standards and Codes of practice.

Screed materials should not include any insulating materials and should comply to the minimum depth requirements.

Typical section for Traditional Sand & Cement screed on Staple System


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Typical section for an Anhydrite Flowing screed on Staple System


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