Natural clay plaster - the gypsum alternative

Description
♦ Natural clay plaster is a natural material which is created by composing rocks and minerals, mixed with sand and water to create a workable material for plastering.
♦ A more environmentally friendly choice than traditional gypsum plaster.
♦ The surface finish is typically matt, although some polished surface finishes can be created.
♦ Smooth or rough textures can be created when drying.

Uses
♦ Clay can be used as a plaster undercoat, medium finish and fine finish.
♦ Available as a general plaster that needs painting.
♦ Available as a pre-coloured plaster which does not need painting.
♦ A primer may be required when using on some surfaces.
♦ Suitable for both historic and modern interiors.
♦ Can be used in moist areas, unless in direct contact with water.

Advantages
♦ A 100% natural, breathable material which absorbs moisture.
♦ Material naturally absorbs odours.
♦ Natural properties are anti allergic.
♦ Plaster can be used with a range of absorbent backing surfaces; brickwork, board, gypsum, plasterboard and plaster undercoat.
♦ Excellent noise insulation properties.
♦ Natural fire resistant qualities.
♦ A good regulator of temperature (keeping warm in winter and cool in summer) and humidity levels.
♦ Can be left unfinished without surface paint.
♦ A non dusting finish.
♦ Plaster finish is easily maintained by soaking area with water and refilled.
♦ Can be treated the same as gypsum plaster using the same paint, fixtures and fittings.
♦ Plastering with clay is a quicker method than with traditional gypsum plastering.
♦ Long drying time means that it is workable for longer.

Disadvantages
♦ Water will penetrate the finish with direct contact and swell as it absorbs water.
♦ Constant flow of water will erode a clay finish e.g. drips.
♦ The drying time can take up to one week.

Embodied Energy
♦ Transportation will increase levels of embodied energy.
♦ Lower level of embodied energy during manufacture as material is not fired in a kiln at high temperatures as other clay products.

Source/Origin
♦ Readily available in most regions.

Renewable
♦ Sources of clay are not renewable, however they are abundant.

Environment & Health
♦ Extraction of raw material and quarrying can destroy natural habitats and landscapes.
♦ Water based sealants can be found to seal plaster.
♦ Natural clay plaster will only retain its breathable qualities if sealants and paints are non synthetic.
♦ No VOC emissions.

Performance
A durable and stable plaster, some types are comparable with concrete.

Recycled content
♦ n/a

Recyclable
♦ n/a

Disposal / Biodegradable
♦ Yes

To read more on plaster visit my article on Lime Plaster.

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