Dry screeds and dry fills

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Laterlite Plus Expanded Clay

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Dry screeds and fills can be used for:

rapidly laying, levelling and insulating layers on top of a slab
to obtain a defined level on inflected or irregular supports (e.g. old timber suspended floors or uneven new concrete slabs)
integrating service runs, even in shallow screeds
filling voids between the components of timber suspended floors (battens and beams) to give thermal and acoustic insulation

Because Laterlite Plus is thermally insulating, sound absorbent, strong, stable, durable, incombustible (Euroclass A1), cannot be attacked by parasites, and extremely lightweight (330 kg/m³), it minimises the structural load, even on slabs with poor load-bearing capacity. It is also used as a dry granular layer for levelling or as fill and for support.

As a dry material that does not absorb water, it is safe to use in contact with wood or other perishable materials and significantly reduces any risks deriving from incorrect storage on site.

The most common applications are:

DRY SCREED

Laterlite Plus Expanded Clay of granule size 2-3 is used in dry screeds as a continuous (unless interrupted by battens) levelling, compensating, and insulating granulate layer. It does not require compaction, is extremely stable, and can be used even at very reduced thicknesses (from 1cm) on all the most common types of support, both for refurbishment works and new construction.

The granulate can be poured directly over any underfloor service pipes: the depth cover to pipes must be 10 mm minimum.

The dry screed is completed by laying on top of Laterlite Plus 2-3 granular levelling layer special types of dry screed boards (OSB, plasterboard, gypsum fibreboard, wood chipboard) ready to take the floor finish.

INSULATING FILL WITHIN THE DEPTH OF SUSPENDED TIMBER FLOORS

In new or refurbished timber suspended floors, loose Laterlite Plus Expanded Clay of granule size 3-8 is used as dry insulating fill between joists and battens, improving the thermal and acoustic performance of the floor without increasing the fire load or bringing or attracting damp. Because of its very good strength and stability it also helps to support the finishing layers of the floor.

NAILED TIMBER FLOORS

Because Laterlite Plus Expanded Clay is a dry hydrophobic material, it is widely used as lightweight insulation below nailed timber flooring as a substitute for gravel or non-loadbearing insulation.

It can be used:

in a single continuous layer that requires no battens because of its very good stability and compressive strength, and provides the support for the wood strips to which the timber flooring is nailed.
as insulation fill between joists and battens

Please see the specific sections for further information on dry fill to vaulted slabs, or insulation in contact with the ground or in roof spaces.