This website uses cookies to ensure that we give you the best experience on our website.
By continuing to browse the site you are agreeing to our use of cookies. To find out more click here

Weber Saint-Gobain - Official website of the company

flexirend highbuild

flexirend highbuild
flexirend highbuild

Product Benefits

  • May be applied to most old or new surfaces provided that they are suitably smooth and flat 
  • Suitable substrates: Externally weberend OCR; traditional cement rendering;
    fair-faced concrete;
    sound existing exterior grade paint;
    exterior grade composition and cement boards.
    Internally gypsum finishing plasters;
    dry lining and insulating boards.

Multi-textured resin based finish 


This list is not exhaustive and other smooth, flat surfaces may be considered. In addition, brickwork and blockwork may be coated where the joints will be accepted as a feature.

Product Features

About this Product

flexirend highbuild is a decorative and protective resin based surface coating for application to exterior and interior surfaces. It is a high quality, weather resistant finish, which may be textured to a variety of designs. It is available in a range of colours and provides a superior quality appearance to cement rendering, concrete and many other backing materials.

Features and Benefits

  • Factory controlled to give a consistently high quality product
  • Highly durable
  • Remains slightly flexible after curing and will accommodate a degree of building movement
  • Resists the penetration of external water but allows the substrate to breathe
  • Excellent weather resistance
  • Includes a biocide to inhibit organic growth

Colours & Finishes

flexirend highbuild is available in a range of 6 colours. Specifiers should whenever possible, obtain samples prior to specification.

Technical Services

Weber's Customer Services Department has a team of experienced advisors available to provide on-site advice both at the specification stage and during application. Detailed specifications can be provided for specific projects or more general works. Site visits and on-site demonstrations can be arranged on request.

Technical helpline
Tel: (01525) 722110
Fax: (01525) 718988

Sales Contact

Sales, England and Wales
Tel: (01525) 722100
Fax: (01525) 718988

Sales, Scotland
Tel: (0141) 445 0121
Fax: (0141) 445 0122

Sales, Ireland
Tel: (028) 9335 2999
Fax: (028) 9332 3232


Send or download the documents

You can either send the documents to an email address, or download it

Preparation & Application


All surfaces must be sound, clean, dry and free from any material which may impair adhesion.

Scaffolding must be independently tied to allow uninterrupted application. Any faults in the structure, particularly those which may lead to moisture penetration must be rectified.

To avoid dampness and discolouration, external finishes should be avoided below DPC or within 150 mm of ground level. Building board substrates should have the joints reinforced and caulked with a suitable caulking system prior to priming.

Slightly friable or high suction surfaces or those that offer a mixed suction should be treated with a suitable stabilising primer 24 hours before application of the finish.

Small cracks may be filled with flexirend highbuild prior to the application of the full coat.

All substrates must be of good alignment and blemish free. Faults in the background may be evident in the finished work.

Mask around the areas where material is to be applied. Masking tape must be removed before the material has dried.

Expansion joints should be included as required by the substrate and carried through all applied materials.


flexirend highbuild is supplied ready-mixed.

Stir thoroughly before applying. For spray applications up to 5% of clean water may be incorporated during mixing.

To ensure colour uniformity, the materials required for complete and adjoining panels should be of the same batch number or be thoroughly mixed together before use.


flexirend highbuild is usually applied by hawk and trowel or spray. However, decorators may wish to apply the material using a long pile roller or caulking knife. Whatever method is chosen, an even coat must be applied and a flowing edge must be maintained.

Hawk and trowel
Apply a tight coat of flexirend highbuild to a thickness of approximately 1 - 2 mm. Immediately after application, finish the material with the appropriate tool to achieve the desired texture, e.g. texturing roller, sponge or spatula, etc.

Apply flexirend highbuild at the rate of approximately 2.5 kg/m2, using a long pile roller. The head must be kept fully loaded to allow for an even application without spreading the finish too thinly. Immediately after application, finish the material with the appropriate tool to achieve the desired texture.

When spraying, flexirend highbuild is applied in a single operation, with an open hopper type power spray to a thickness of approximately 1 - 2 mm. Alternatively, a flat, tight coat may be applied with a hawk and trowel followed by a light spray texture. Other machinery may be used for spraying. Contact our Technical Services Department for further details.

flexirend highbuild will normally be surface dry within several hours and through dry within 24 - 72 hours. Good ventilation is required during this period. Damp conditions will hinder and extend drying times.

Protect from unfavourable weather conditions during application and curing.

Good practice
Do not apply:

  • If frost is forecast within 24 hours of use
  • In damp/wet conditions
  • In temperatures below 5°C or above 30°C
  • On elevations in direct sunlight or where the substrate is hot


All equipment must be washed with clean water (preferably hot) immediately after use. Do not empty waste material into drainage systems.

Packaging, Health & Safety


flexirend highbuild is supplied in 15 kg pails.

Coverage / Yield

For each mm of thickness, you will require approximately 1.7 kg/m2.

When to a thickness of 1 - 2 mm, coverage is approximately 6.0 m2 per 15 kg pail.

Note: These estimates take no account of wastage and may vary according to the type of surface involved.

Storage and Shelf Life

When stored airtight in a dry place at temperatures above 5°C and protected from frost, shelf life is 12 months from date of manufacture.

Do not over-stack.

Health and Safety

Essentially not hazardous.
Not harmful during normal use.
After contact with skin, wash immediately with plenty of water.
In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
Keep out of the reach of children.

For further information, please request the Material Safety Data Sheet for this product.