About this product
weber.rend IF is a multi-coat render system incorporating breather membrane, expanded metal lath and polymer modified render.
Features and Benefits
- Allows previously unsuitable masonry substrates to be rendered
- Suitable for a wide range of cementitious and synthetic finishes
- Factory batched materials for consistency
- Large range of colours available in all finishes
- Supported by comprehensive technical and architectural services.
Constraints
Constraints
Rendering onto metal lath is more prone to cracking than direct application on to a masonry background. It is therefore strongly recommended that the weber fixing requirements be strictly adhered to, and that cognisance is taken of the BRE Information Note No. 5 and also the BS 5262: 27.3 relative to panel sizes when rendering on to metal lath.
Preparation
Existing rendered substrates
Hammer test and remove all areas of loose, 'bossed' render.
Treat surfaces with weber CL150, a biocidal wash, to remove any traces of organic growth.
Make good surface using weber.rend stipple and weber.rend PUC or weber.rend TUC
product required
Beads, trims and flashings
Render only beads are available in coated galvanised, stainless, coated aluminium or rigid plastic in 3 m and 2.5 m lengths.
Trims and flashings such as oversills and copings, are available in PPC aluminium in 2.5 m lengths or made to order.
Breather membrane
The reinforced composite breather barrier membrane is supplied in 1.5 m x 50 m rolls.
Fixings
Multipin fixings are supplied in boxes of 250 and will be suitable for most masonry substrates. Fixings are specified on a project by project basis and, where necessary, pullout values are established to ensure the weber.rend IF system is securely fixed back to the substrate.
Undercoat
weber.rend PUC is a factory batched cement based mortar.
Top coats
Coloured top coats are available for use as a background for dry-dash, a scraped textured finish, or a smooth float finish for synthetic textured coatings
Application
Fix the breather membrane either horizontally or vertically with the multipin sleeves at the centres specified. The membrane must be fitted with the brown paper side to the masonry background. There must be an overlap of 150 mm at all joints. Always refer to the System Specification Sheet or relevant project documentation for any project specific information.
Fix render drip bead to base and other render beads as specified.
Fix the specified lath using the appropriate multipin nails and washers.
Mix and apply the weber.rend PUC to the specified thickness. Mix and apply the top coat as directed to achieve the desired finish.
Where weber.rend TF/DF or weber.sil TF is required, apply weber PR310 prior to the application of the selected textured coating.
Good practice
Do not apply mineral renders:
- 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
Health and Safety
While not hazardous in its own right, sheets of expanded metal lathing are awkward to handle and cut edges are very sharp. Care should be taken and gloves worn at all times.
Technical services
Technical support and advice
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 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
