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Permarend Exterior Render System (Non-Insulated) - Render System

Verified by manufacturer 4 days ago

Permarock Products Ltd

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

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Application

Preparation of substrate for applying the system:

  • New masonry walls shall be allowed to cure for a minimum period of 4 weeks prior to the application of renders.
  • Where existing render is present, the substrate shall be visually inspected and hammer tested. All loose, hollow-sounding, defective, debonded or cracked render shall be removed back to a sound substrate.
  • Walls shall be free from defective paint coatings, mould growth, moss, algae, dirt, dust, loose material, loose coatings and any other contaminants that may impair adhesion. Such materials shall be removed by scraping, brushing or other suitable means to expose a clean and sound substrate.
  • Areas affected by moss, mould, algae, lichens or similar biological growth shall be treated with Permarock Fungicidal Wash and allowed to dry prior to the application of dubbing-out compound, adhesives or renders.
  • Prior to commencement of rendering works, the substrate shall be checked for line, level, plumb and overall surface flatness.
  • Localised irregularities, hollows and projections shall be made good as necessary. Highly uneven surfaces may require levelling using Permarock Dubbing-out Compound to provide a suitable substrate for the render system.
  • The substrate shall be dimensionally stable, sound, clean and free from any material that may adversely affect the adhesion or performance of the render system. Any necessary repairs, levelling works, structural remediation or other preparatory works required to provide a suitable substrate for the Permarend Exterior Render System shall be completed prior to application of the system.

System installation:

  • The system shall be installed by a specialist installation contractor registered with Permarock Products Ltd.

Colour Consistency:

For Permarock SiliconeUltra K-finish:-

  • For render colours with a lightness factor (LF) of ≤ 15, overpainting should always be carried out.
  • For render colours with LF between 15 and 20, overpainting is strongly recommended.

For Brick-effect Render, Brick Slips and Dry Dash finishes:-

  • Colour and appearance between production batches may vary slightly. Materials shall, where practicable, be obtained from the same batch.
  • Where multiple batches are required, materials shall be mixed and distributed across the work to minimise visible colour variation and avoid distinct batch lines.

Weather / Temperature / Protection

  • Do not apply cement-based materials when the temperature is below 5 oC on a falling thermometer or below 3 oC on a rising thermometer.
  • Do not apply material when the temperature of the air or wall surface is in excess of 30 oC or when Summer strength sunlight is hitting the area square on without affording protection against rapid drying which can result in loss of strength and/or patchiness/shade differences in the finished system.

Description

Permarend is the leading brand of high impact-resistant, thin-coat, polymer-modified, crack resistant renders for use on sound brickwork, blockwork, concrete and other masonry surfaces. This system is suitable for building to any height.

The Permarend system is a multi-coat system that is tough, durable, lightweight, flexible and breathable making it an attractive and more advanced alternative to traditional sand-cement renders or cement-lime renders.

Engineered for strength and resilience, Permarend systems are highly impact-resistant and built to withstand the rigours of everyday environmental exposure—such as wind-driven rain, temperature fluctuations, and mechanical stresses—without compromising their appearance or integrity.

The system employs Permarend Bedding Mortar, a polymer-modified cement-based render which, in conjunction with Permarock Reinforcing Mesh, provides a tough, durable and flexible reinforced basecoat onto which can be applied any of the wide range of decorative renders, finishes and effects available from Permarock. The incorporation of stainless steel anchors through the reinforcement layer of the basecoat provides additional stability when the system is applied over existing heavy-weight/built-up render systems.

Market Sectors: Residential, Education, Healthcare, Public Buildings, Commercial.

Substrate Types: Brickwork, Blockwork, Concrete and other masonry surface.

Decorative Render / Finishes: SiliconeUltra K Finish, Brick-effect Render, Brick Slips, Dry Dash.

Key features

  • High performance, multi-coat render system;
  • Lightweight, flexible and crack resistant renders;
  • Suitable for brickwork, blockwork or concrete substrates;
  • Wide range of decorative renders / finishes / effects;
  • Incorporates lightweight reinforcement for additional system durability;
  • Mechanical fixings can be introduced to anchor the reinforcement layer to the substrate
  • BIM Level 2 compliant (bimstore).

Reinforcement layer:

  • Crack resistant.
  • Can be used on buildings of any height.
  • Optional mechanical fixing of the reinforced basecoat for difficult substrates
  • Incorporates lightweight reinforcement for additional system durability.
  • Ease of application.
  • Wide range of decorative finishes: Permarock Silicone Ultra K render, Dry Dash, Brick-effect Render and Brick Slips.
  • Has a working design life of at least 30 years.

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

  1. Basecoat: Permarend Bedding Mortar (4.0 - 4.5 kg/m2 on flat substrates);
  2. Mesh reinforcement: Permarock Reinforcing Mesh;
  3. Mesh (corner) patches: Permarock Reinforcing Mesh (500 mm x 250 mm);
  4. Reinforcement fixings (if required): Permarock stainless steel anchors with plastic "slug" insert.
  5. Sponge-floated basecoat: Permarock Bedding Mortar (3.5 - 4.0 kg/m2) (For SUK only)

Note: Where the Permarock Dry Dash, Brick-effect Render or Brick Slips are specified as the finishing coat, it is not necessary to apply a sponge-float layer of Permarend Bedding Mortar.

Beads/ Trims/ Profiles:

  • A full range of beads, trims, sealing tapes, expansion joint tapes and window sealing strips (APU beads) are available to complete the design of the system. 

Ancillary items:

Permarock Dubbing-out Compound for levelling and filling the substrate.

Design considerations:

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

General information

Color

Other

Beige

Black

Blue

Brown

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Finish

Textured

Material

Acrylic

Silicone

Render

Mineral

Aggregate

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Shape

Other

Length

Bespoke

Width

Bespoke

Height

Bespoke

Warranty description

Ten year

Uniclass

Ss_25_45_70_55 Multicoat render systemsPrimary

CAWS

M20/160 Proprietary cement gauged render

M20/19 Proprietary cement gauged render

Product range

External Render Systems

Specification data - Multicoat render systems

Classification data

Substrate preparation

Not required.
PermaRock dubbing-out compound.

Guidance for specification option:

To make surfaces good (i.e. more uniform).

PermaRock fungicidal wash.

Guidance for specification option:

For treating walls affected by algae, mould etc.

Manufacturer guidance

Consult manufacturer for details of preparation to suit project substrates.

First undercoat

Not required.

Guidance for specification option:

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

PermaRock bedding mortar.

Guidance for specification option:

  • 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.
  • 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.

Guidance for specification option:

For Scratch Render Finish/ Silicone Scratch Render FT.

PermaRock K&R primer.

Guidance for specification option:

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

Second undercoat

PermaRock reinforcing mesh.

Guidance for specification option:

  • 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.
  • 500 x 250 mm mesh (corner) patches incorporated into PermaRend Bedding Mortar at corners of all structural openings and level changes (steps).
  • PermaRock Corner Reinforcement Angles incorporated into PermaRend Bedding Mortar at all vertical and horizontal external corners.

Final coat

PermaRock acrylic K-Finish stippled render/ R-Finish corrugated render.

Guidance for specification option:

  • 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.

Guidance for specification option:

  • 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.

Guidance for specification option:

  • 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).

Guidance for specification option:

  • 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.


Colour:

  • 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.

Guidance for specification option:

  • 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.

Guidance for specification option:

  • 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.

Guidance for specification option:

  • 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.

PermaRock silicone scratch render / PermaRock silicone scratch render FT.
PermaRock silicone ULTRA facade coating.

Guidance for specification option:

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

Beads

-

Manufacturer guidance

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

Sealant movement joints

-

Sealant

Live construction movement joints.

Guidance for specification option:

should be brought through the system.

Refer to manufacturer's standard details.

System completion

-

Manufacturer guidance

  • 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.


Product Reference

PermaRend Exterior Render Systems (Non-Insulated)

Substrate

Existing brickwork/ blockwork/ concrete.
New brickwork/ blockwork/ concrete.

Grain size

Not applicable.

Guidance for specification option:

All types other than K or R finishes.

K 1.5 mm.

Guidance for specification option:

For Silicone ULTRA/ Acrylic K-Finishes only.

K 2.0 mm.

Guidance for specification option:

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

K 3.0 mm.

Guidance for specification option:

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

K 5.0 mm.

Guidance for specification option:

For Mineral K-Finishes only.

R 2.0 mm.

Guidance for specification option:

For Silicone ULTRA/ Acrylic R-Finishes only.

R 3.0 mm.

Guidance for specification option:

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

R 5.0 mm.

Guidance for specification option:

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

Sustainability data

Contains Red List materials

No

Country of material origin

United Kingdom

Country of product manufacture

United Kingdom

Material

Acrylic
Silicone
Render
Mineral
Aggregate
Cementitious
Polymer-modified cement
Silicate
Water-based
Brick

Recyclability

Not Assessed

Recycled content

As defined in clause 7.8 of BS EN ISO 14021

2 %

Literature

Permarock Brick Effect Render (two-coat self-coloured polymer-modified cement-based render used to replicate brickwork)

Permarock Brick Effect Render (two-coat self-coloured polymer-modified cement-based render used to replicate brickwork)

Permarock Brick Slips (Lightweight, flexible and breathable synthetic resin brick)

Permarock Brick Slips (Lightweight, flexible and breathable synthetic resin brick)

Permarock Dry Dashing Aggregate / Stone (tough, durable, long lasting, cost-effective and almost maintenance render finish)

Permarock Dry Dashing Aggregate / Stone (tough, durable, long lasting, cost-effective and almost maintenance render finish)

Permarock SiliconeUltra Through Coloured K Textured Render (self-cleansing nano-quartz, colour-fast renders)

Permarock SiliconeUltra Through Coloured K Textured Render (self-cleansing nano-quartz, colour-fast renders)

Permarock SiliconeUltra Façade Coating (advanced façade paint with nano-quartz matrix technology and high resistance to UV)

Permarock SiliconeUltra Façade Coating (advanced façade paint with nano-quartz matrix technology and high resistance to UV)

PermaRend (Render Only) Standard Detail Set - Masonry Walls

PermaRend (Render Only) Standard Detail Set - Masonry Walls

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