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Lime Green Duro Lime Plaster Base Coat

A general purpose lime undercoat plaster. Suitable for most masonry backgrounds.

Great for renovation, conservation or eco-friendly new builds, Duro lime undercoat offers superior levels of breathability - perfect for walls with damp or salt problems since water can evaporate easily and does not remain trapped where it can damage stone, brickwork and wood.

Duro lime plaster base coat is also flexible and long-lasting, so it's more resilient to cracking or crazing compared with a site mixed lime render.

Duro is applied as a standard base coat plaster and finished with a finishing plaster such as Lime Green Solo or Fine stuff lime putty plaster.

For situations where extra a lightweight thermally insulating mix is required see our Ultra undercoat, which contains insulating beads.

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Data Sheet

View technical information about this product here. If you require any other information please contact us


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What is Duro for?

This product is a premixed lime undercoat for masonry. Just add water and used to build out the levels of the wall true and straight before applying a lime plaster finish coat, or to level the walls before applying Warmshell Woodfibre Boards.

What backgrounds can be lime plastered with a layer of Duro undercoat?

Duro is used for traditional masonry, like solid brick or stone walls. If you have wooden laths you will need Ultra and if you want to replace plaster with an internal insulation system have a look at Warmshell Internal.

How much Duro plaster basecoat will you need?

Over 1m2 each 1 mm of thickness requires approximately 1.7 Kg
at 10 mm thick, 1 bag will cover 1½ m
at 15 mm thick, 1 bag will cover 1m2

at 20 mm thick, 1 bag will cover ¾m 2

How to prepare a wall for lime plastering with Duro

Remove dust, surface contamination, dirt or lichen and loose or friable existing coatings. Where necessary, repair and consolidate masonry and structural defects beforehand. Painted or waterproof surfaces will need removing or special treatment before applying Duro, seek further advice. Before application, dampen the masonry with clean water to control suction. For low-porosity brick or stone or difficult backgrounds such as highly absorbent surfaces, the range of Lime Green Silic8 Primers are suitable.

How to apply Duro as a lime plaster "scratch" or levelling coat

Use Duro in temperatures of 5°C and rising or 30°C and falling. Apply in coats of around 10 to 15 mm, or thicker if dubbing out. Once ruled off and ready, key the coat using a render comb in a regular wavy pattern if further coats of Duro are being applied. For the final undercoat before finishing, apply a light key using a devil float. Leave the Duro to set and harden for between 2 and 7 days, depending on the temperature. The following coats should be applied while the Duro is still “green”.