Lime Green turns 21

Duro Lime Render Base Coat

Duro is a general-purpose lime render base coat that's both practical and eco-friendly.

Great for renovation, conservation or eco-friendly new builds, it 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 render is also flexible and long-lasting, so it's more resilient to cracking or crazing compared with a standard render.

Duro lime render is completely free of cement, gypsum, acrylic, ash and Pulverised Fuel Ash (PFA), so is perfectly compatible with traditional building techniques.

Duro is applied as a standard render undercoat either by hand or machine and finished with Lime Green Natural Finish self coloured render.

For situations where extra warmth is required, see our Ultra undercoat, which contains insulating glass beads.

You can buy Lime Green Duro lime render through a range of national merchants. And as we maintain good stocks, you can be certain of a high level of availability, even for larger projects.

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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 backgrounds can be rendered with a layer of Duro lime 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 render onto breathable insulation have a look at our Warmshell External Wall Insulation system.

How much Duro render base coat will you need?

Over 1 m2 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 1 m2

at 20 mm thick, 1 bag will cover ¾ m 2

How to prepare a wall for lime rendering with Duro

Start by removing dust, surface contamination, dirt or lichen and loose or friable existing coatings. Where necessary, you need to repair and consolidate masonry and structural defects beforehand. Painted or waterproof surfaces will need special treatment before applying a pure lime render like Duro, seek further advice. Immediately before starting to apply the lime render, dampen masonry with clean water to control suction. For low-porosity brick or stone or difficult backgrounds a splatter-dash can be applied of Lime Green Natural Stipple For highly absorbent surface indoors the range of Lime Green Silic8 Primers are also suitable.

Applying Duro as a render coat externally

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”.