PermaRend Exterior Render Systems (Non-Insulated)

Highly impact-resistant, thin-coat, flexible, breathable, crack resistant exterior render system for use on brickwork, blockwork and concrete surfaces.

The multi-coat system that is tough, durable and lightweight, making it an attractive and advanced alternative to traditional sand-cement renders.

Features and benefits:

  • Polymer modified.
  • Can be used in buildings over 18 m in height.
  • Mechanical fixings can be introduced to enhance bonding to the underlying substrate and help improve resistance to wind loads.
  • Incorporates lightweight reinforcement for additional system durability.
  • Ease of application.
  • Includes a range of decorative finish options.
  • Has a working design life of 30 years.

Please note that this is a non-insulated system; consult manufacturer for further details.

Design considerations:

For application over existing painted and/ or rendered surfaces, mechanical anchoring of the reinforcement layer is recommended - consult manufacturer for details.

General information

Uniclass 2015

Ss_25_45_70_55 Multicoat render systemsPrimary


M20/160 Proprietary cement gauged render

M20/19 Proprietary render

Specification data - Multicoat render systems

Product Reference

PermaRend Exterior Render Systems (Non-Insulated)

Building height

Insert requirement.


Existing brickwork/ blockwork/ concrete

New brickwork/ blockwork/ concrete

Preparation/ filling/ levelling

Not required

PermaRock Dubbing-out Compound

Consult manufacturer for details.

PermaRock Fungicidal Wash

Consult manufacturer for details.

Movement joints

Not required


Locate as per project drawings.

Reinforcement layer (render carrier)



PermaRock Bedding Mortar

For Silicone ULTRA K-Finish and R-Finish/ Acrylic K-Finish and R-Finish/ Mineral K-Finish and R-Finish/ stone chip render/ brick slips/ brick effect render/ dry dash.

PermaRock Scratch Render Basecoat

For Scratch Render Finish/ Silicone Scratch Render FT.

Basecoat (sponge float finish)

Not required

For Scratch Render Finish/ Silicone Scratch Render FT/ Brick Effect Render/ Dry Dash.

PermaRock Bedding Mortar

For Silicone ULTRA K-Finish and R-Finish/ Acrylic K-Finish and R-Finish/ Mineral K-Finish and R-Finish/ stone chip render/ brick slips.

Mesh reinforcement

PermaRock Reinforcing Mesh

Mesh (corner) patches

PermaRock Reinforcing Mesh

500 x 250 mm patches incorporated into PermaRend Bedding Mortar at corners of all structural openings and level changes (steps).

Corner reinforcement

PermaRock Corner Reinforcement Angles

Incorporated into PermaRend Bedding Mortar at all vertical and horizontal external corners.

Render/ Finish



Not applicable

PermaRock K&R Primer

For Silicone ULTRA K-Finish and R-Finish/ Acrylic K-Finish and R-Finish/ Stone chip render/ Brick slips.

Intermediate coat

Not applicable

PermaRock Brick-effect Render Base Layer, colour

For PermaRock Brick-effect Render; insert colour requirement.

PermaRock Dashing Mortar, colour

For PermaRock Dry Dash Finish; insert colour requirement.

Top (finish) coat



PermaRock Acrylic K-Finish stippled render

PermaRock Acrylic R-Finish corrugated render

PermaRock Brick-effect Render (BER) Face Layer

PermaRock Brick Slip Adhesive/ Brick Slips/ Brick Slip Pointing Mortar

PermaRock Dry Dash Aggregate (Dashing Stones)

PermaRock Mineral K-Finish stippled render

PermaRock Mineral R-Finish corrugated render

PermaRock Silicone Scratch Render

PermaRock Silicone Scratch Render FT

PermaRock Silicone ULTRA K-Finish stippled render

PermaRock Silicone ULTRA R-Finish corrugated render

PermaRock Stone Chip Render

Grain size

Not applicable

All types other than K or R finishes.

K 1.5 mm

For Silicone ULTRA/ Acrylic K-Finishes only.

K 2.0 mm

For Silicone ULTRA/ Acrylic/ Mineral K-Finishes only.

K 3.0 mm

For Silicone ULTRA/ Acrylic/ Mineral K-Finishes only.

K 5.0 mm

For Mineral K-Finishes only.

R 2.0 mm

For Silicone ULTRA/ Acrylic R-Finishes only.

R 3.0 mm

For Silicone ULTRA/ Acrylic/ Mineral R-Finishes only.

R 5.0 mm

For Silicone ULTRA/ Acrylic/ Mineral R-Finishes only.

Equalizing coating/ Paint


PermaRock Silicone ULTRA Facade Coating

Self-cleaning facade paint with nano-quartz matrix structure. For use with K-Finish/ R-Finish renders with lightness factor < 20.


Extensive range available; consult manufacturer and insert requirements.

Additional requirements


As drawing

See 'Options' below and insert requirements.

Product Options


Consult manufacturer for details of preparation to suit project substrates.

  • PermaRock Dubbing-out Compound: To make surfaces good (i.e. more uniform).
  • PermaRock Fungicidal Wash: For treating walls affected by algae, mould etc.

Movement joints:

Live construction movement joints should be brought through the system. Refer to manufacturer's standard details.

Reinforcement layer:

- Basecoat:

  • PermaRock Bedding Mortar - is a high-performance, polymer-modified, cement-based reinforcement layer render supplied as a mineral dry powder pre-mix, requiring only the addition of water and mixing on site. Used in combination with PermaRock Reinforcing Mesh.

- Mesh reinforcement:

  • PermaRock Reinforcing Mesh: Alkali-resistant coated, multi-strand glass fibre reinforcing mesh for incorporation into a PermaRock basecoat render (PermaRock Bedding Mortar) to create a reinforced basecoat layer which confers mechanical resistance and dimensional stability to the system.

- Mechanical fixings (anchored reinforcement):

Consult manufacturer for recommendations.

Render/ Finish:

- Top (finish) coat:


PermaRock Acrylic K-Finish stippled render/ R-Finish corrugated render:

High performance, ready-to-use, through-colour, synthetic resin textured renders reinforced with siloxane to impart improved water repellence. Flexible, weather resistant, water repellent and water vapour permeable.

  • Texture: Type ‘K’: Stippled; Type ‘R’: Corrugated.
  • Resistance to soiling: Good.
  • Colour fastness: Good; colour shade dependent.
  • Colour range: Over 1250 standard colours (PermaRock Colour Chart; RAL, NCS, BS 4800, etc.). Colour matching available.

PermaRock Brick-effect Render (BER) Face Layer:

Pre-batched, two-coat/ two-layer, self-coloured polymer-modified, cement-based render designed to simulate the appearance of brickwork. Can also be used to create features such as soldier or sailor courses, brick quoins, arch keystones, springers, etc. and used in combination with other PermaRock decorative finishes.

Incorporates a silicone water repellent, offering good water resistance which helps maintain a cleaner surface for longer. The render can be applied to achieve metric or imperial brick sizes, any bond pattern and also to create non-standard patterns and effects.

  • Thickness: Brick-effect Render Base Coat: Approximately 6 mm; Brick-effect Render Top Coat: Approximately 3 mm.
  • Textures: Various, depending on finishing tools and techniques employed (e.g. brushed, rollered, scratched).
  • Resistance to soiling: Very good.
  • Colour fastness: Very good.
  • Colour range: Nine standard colours. Non-standard colours to special order (minimum order quantities may apply).
  • Colour options: Special pigment powders can also be incorporated into the surface to vary the colour effect.

PermaRock Brick Slips:

Lightweight, flexible and breathable, synthetic resin brick tiles used to create a brickwork effect.

Facing brick slips and corner (pistol) brick slips provide a traditional or contemporary brick appearance to wall surfaces. Manufactured from high quality raw materials using modern machinery and the skills of experienced craftsmen, these simulated bricks offer a multitude of outstanding product characteristics.

The brick slips offer flexible application and design features, and are durable, robust, impact resistant and easy to clean. The brick slips are bonded to the primed reinforcement layer using a ready-mixed dispersion adhesive. Joints are subsequently pointed with a coloured, semi-dry synthetic pointing mortar.

  • Size: Flat facing bricks: 215 x 65 x 4–6 mm-thick; Corner-facing bricks: 215 x 102 x 65 x 4-6 mm thick. Other sizes available, subject to minimum order quantities.
  • Coverage: Flat facing bricks: Approximately 58 per m²; Corner (pistol) bricks: Approximately 13 per metre.
  • Resistance to soiling: Very good.
  • Colour fastness: Excellent.
  • Colour range: 12 standard colours. Colour matching available, subject to minimum order quantities.
  • Textures: Flat, textured or sand particle.

PermaRock Dry Dash (Dashing Aggregate):

Also known as dashing stones or pebble dashing. Traditional decorative rendering technique that provides a tough, durable, long lasting, cost-effective and almost maintenance-free finish to exterior wall surfaces.

Based on Dashing Mortar (DM), a specially formulated, self-coloured, polymer enriched mineral-cement offering enhanced performance over traditional sand/ cement renders into which pre-washed and screened Dashing Aggregates/ Stones are cast during the application process.

  • Weathering resistance: Excellent.
  • Durability: Excellent.
  • Colour fastness: Excellent.


  • PermaRock Dashing Mortar: Available in grey, white, yellow, cream, red and pink as standard. Other shades can be made to special order and subject to minimum order quantities.
  • PermaRock Dashing Stones: 32 standard blends of natural aggregate stones, specially selected and blended for dry dashing, are available for use in combination with PermaRock Dashing Mortars. Other colour combination can be manufactured, subject to minimum order quantity, or can be blended on site by the installer.

PermaRock Mineral K-Finish/ R-Finish Through-colour Textured Renders:

Lime-cement-based, non-combustible, lightweight, ecologically-compatible and cost effective renders providing an economical alternative to synthetic through-colour textured renders (due to low consumption rates and ease of application).

Hydraulically curing materials are based on a white cement and lime binder system with lightweight additives, minimal organic content, and additives to induce water repellency.

  • Texture: Type ‘K’: Stippled; Type ‘R’: Corrugated.
  • Resistance to soiling: Good.
  • Colour fastness: Very good.
  • Colour range: Over 900 standard colour shades (lightness factor (LF) ≥30); consult manufacturer's literature for details. For colours with LF 20–30, over-painting with a PermaRock equalising paint is advisable.

PermaRock Silicone ULTRA K-Finish/ R-Finish Through-colour Textured Renders:

Based on a hybrid binder system of organically crosslinked nano-quartz particles and silicone emulsion, offering a self-cleaning effect with enhanced resistance to dirt pick-up and mould/ algae growth, which provides cleaner surfaces for longer than conventional silicone, acrylic or mineral renders.

Lightweight, water repellent, excellent water vapour permeability and can resist aggressive air pollutants. Low environmental impact renders also contain a preservative against coating deterioration due to algae and fungus.

  • Texture: Type ‘K’: Stippled; Type ‘R’: Corrugated.
  • Resistance to soiling: Excellent.
  • Colour range: Over 1000 options, including over 500 ‘A1’ colour shades: PermaRock Colour Chart, RAL (non-A1 shades) and BS 4800 (non-A1 shades). Colour matching service available.
  • Colour fastness: ‘A1’ colours provide excellent resistance to colour fade and chalking. Colour fastness of non-A1 colours is dependent on the colour shade selected.

PermaRock Stone Chip Render:

Ready-mixed, acrylate-based exposed aggregate finish with colour coordinated natural stone granules. Tough, durable exterior finish, particularly suited for application around entrance ways, plinths, etc.

Environmentally friendly solvent-free, water-based formulation. Achieves a silk-matt, scrub resistant, cleanable, tough and hard wearing decorative finish that is resistant to aggressive air pollutants, moss, algae and fungal growths.

  • Resistance to soiling: Very good.
  • Colour fastness: Excellent.
  • Colour range: Nine standard colours; other colours available to special order and minimum order quantities.

Beads/ Trims/ Profiles:

Render-only beads, including verge trims, top trims, starter tracks, full system stop beads, render stop beads, window sealing strips (reveals beads), movement joint beads/ profiles for vertical and horizontal joints. Sealing tapes and expansion joint tapes. All as system manufacturer’s or architect’s details, to be supplied by PermaRock.

Additional requirements:

  • Specify movement joint trims, etc. or refer to detail drawings.
  • Specify areas for additional reinforcement mesh e.g. at locations prone to greater risk or intensity of impact, etc.
  • Provide details of brick coursing, bond and features to quoins, door/ window heads and raised feature bands or margins around doors/ windows etc., or refer to drawings.
  • Provide details of colour changes, panelization/ faux joints, etc., or refer to detail drawings.

Similar products from PermaRock Products Ltd