weber.thermL1  

weber.therm L1 is a new-generation factory-batched, through-coloured mineral render for a one coat application on to external wall insulation with metal lath incorporating a scrape or dry-dash finish

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• One coat machine application, significantly, reducing the ‘programme of works’ and all associated costs
• Through colour, non-combustible, thick mineral render for low maintenance and durability
• Particularly suited to high rise applications and for areas where high impact resistance is required
• Quality assured raw materials
• Ready mixed – only the addition of potable water required on site for ease of use
• Supported by comprehensive technical and architectural services

12 standard and 24 standard special colours. See on the right hand side of this page.

The quality of application of this material depends on suitable operative skills and product familiarity.

Restrictions on weather conditions during application and curing must be respected.

Sound trade practices and printed instructions must be followed.

Good access and appropriate protection must be provided.

Ensure insulation and lath are securely fixed back to the substrate.

Remove any bulges in the lath and ensure all lath overlaps are tied as required. (Refer to the application guide)

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

weber.therm L1 can be applied by hand, or by using a render spray machine (refer to Weber render solutions catalogue for examples of suitable pumps).

Scrape texture finish

Mix 25 kg of weber.therm L1 with 5.25 – 5.75 litres of potable water then apply the weber.therm L1 to a thickness of 10 – 12mm ensuring lath is fully encapsulated. When the first pass of weber.therm L1 render begins to take up, apply a further 7 – 9 mm to form a minimum 19 mm monolithic render coat. Rule level and allow to set.

When weber.therm L1 is ‘green’ (set but not fully hardened) it should be scraped in circular motions using a scraping tool. It is essential that this is done carefully and evenly, ensuring all laitance is removed and that no part is missed. Thoroughly brush down the surface of the scraped finish using a soft bristle brush.

Set time/scrape time

Estimating the setting and scraping time of a render is not an exact science. There are many factors that affect the setting time of a render including temperature, prevailing winds, water addition, thickness of coat and type of substrate i.e. high or low suction. The experience, skill and product knowledge of the applicator will play an important part in determining when to apply the render, to ensure the scraping time fits in with his working practice.

weber.therm L1 is generally a ‘next day’ scrape render. As with all mineral renders, in low temperatures setting times will be longer than in warmer periods. In hot weather or in strong drying winds if the render is applied early in the morning it will be possible to scrape back in the late afternoon on the same day of application..

weber.therm L1 will set and gain hardness in a similar manner to all conventional mineral renders and in common with all other mineral renders, newly applied render must not be allowed to dry out too quickly i.e. the cement must be allowed to cure and fully hydrate. Therefore in extreme hot weather conditions it may be necessary to protect the newly applied render from the sun and drying winds. Refer to the BS 5262 Code of Practice for External Renderings.

Ashlar marking

The weber.therm L1 is applied as above, but with an overall average finished thickness of 19 mm.

Light ashlar marking, no more than 2 – 3 mm deep, can be cut in the surface using a Weber square-edged cutting tool.

Dry dash finish

Mix 25kg of weber.therm L1 with 5.25 - 5.75 litres of potable water and apply the weber.therm L1 to a thickness of 10 – 12 mm ensuring lath is fully encapsulated. When the render begins to take-up, apply a further 4 – 6 mm, flatten off and dry dash in the normal manner. The minimum mortar thickness should be 16 mm (overall finished thickness would be a minimum of 18 mm).

Spray roughcast finish

Spray-apply a first pass to a thickness of 15 mm, completely encapsulating the lath. Rule to achieve a level, flat surface. When the first pass begins to ‘take up’, apply a second pass, textured to produce a maximum overall thickness of 18 mm.

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

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

Note: These estimates take no account of wastage and will vary according to the method of application.

Store in clean, dry conditions above 5°C. When stored unopened in correct conditions a shelf life of 12 months can be expected. Protect from frost.

Contains cement.

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

During the planning stages of a project, advice should be sought from Weber technical staff.

Advice based on technical expertise together with unrivalled practical experience is freely available and covers:

Design: assistance with the selection of the appropriate system, including working details and U-value calculations.

Pre-Contract Documentation: specifications, typical details, method statements.

Contract Documentation: site packages, available through the specialist contractor. These include approved details, specification and site procedures.

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 demonstration can be arranged on request.

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

Sales, England & 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