PermaRock Dry Dash

Dry Dashing is a traditional decorative rendering technique that provides a tough, durable, long-lasting, cost-effective and almost maintenance-free finish to exterior wall surfaces.


PermaRock Dry Dash comprises pre-washed and screened Dashing Aggregates which incorporate different types and colours of stones that are blended together and are applied to a specially formulated, self-coloured, polymer enriched mineral-cement Dashing Mortar (DM) offering enhanced performance over traditional sand / cement renders.

PermaRock Dashing Mortar is a pre-batched and pre-coloured dry-powder premix which requires only mixing with clean water on site. It is available in Grey, White, Yellow, Cream, Red and Pink, with other shades made to special order and subject to minimum order quantities.

PermaRock Dry Dash is assessed to EN 13501-1 and when used as the decorative finish of a PermaRock Mineral Fibre External Wall Insulation system, the system achieves an A2-s1,d0 classification and is suitable for use on buildings of any building height, including those with a storey height above 11 metres.

Any of the comprehensive range of graded dashing stones can be used with any shade of PermaRock Dashing Mortar to achieve an attractive ‘pebble dash’ finish.

Method of Application

Supplied pre-blended to the specified colour, PermaRock Dashing Mortar requires only mixing with water on site. The mixed and hydrated material is applied onto the prepared substrate (reinforced base coat) by stainless steel trowel at a rate of approx. 6 - 8 kg per square metre. The Dry Dashing aggregate is applied by casting the stones into the Dashing Mortar whilst it is still wet and in a plastic state so that a uniform appearance is achieved.

Application / Drying Conditions

The temperature of the material, substrate, and air should not fall below +5 ºC during application and drying. The material cures and dries by hydration and evaporation and is usually sufficiently cured after 24 hours at 65%RH.

Lower temperatures prolong the drying time, whilst higher temperatures accelerate drying. High temperatures may lead to too-rapid drying / evaporation and should be avoided. Dashing in cold or wet conditions or using wet aggregates / dashing stones may encourage the formation of lime bloom which is more noticeable on coloured dashing mortars.


PermaRock Dashing Mortar is supplied in 25 kg sacks as a dry powder pre-mix requiring only mixing with clean water on site.

Available Colour / Texture / Grain Size