Products

Nawkaw provides masonry restoration & architectural staining; formliners and form accessories.

Application Guidelines

Description

RECKLI Formliners are made from an elastic material for the patterning and texturing of all finished and 'as struck' concrete surfaces. The RECKLI formliner system has a proven track record of over 35 years application throughout the world. Concrete is still one of the most durable, economic and cost effective building materials available today. It presents all the advantages for creating safe, individual, aesthetic and variable construction. When in its liquid form it allows almost unlimited possibilities of forming and molding to its final hardened shape. Architectural design is only restricted by the type of formwork or mould employed. Many of these problems can be overcome when you use an elastic material as your mould or shutter. With regard to concrete finishes in general there continues to be specifications and requirements that are unrealistic in their aims. Even with the application of modern concrete technology and skilled personnel these demands are not fully complied with. In this respect patterned and textured concrete finishes with the subtle interplay of light and shadow enlivening the surface finish offer both designers and contractors decisive advantages to meet required and future specifications. The RECKLI elastic formliner system offers ideal possibilities to meet the highest quality requirements for finished and 'as struck' concrete surfaces.

Material

Our formliners are made from rubber-like polyurethane elastomers. Their high flexibility, elasticity and durability allow multiple damage free stripping and release to the concrete and give an exact reproduction of any patterned or textured surface.

Application

RECKLI Formliners are used in in situ and pre-cast concrete construction. In both applications the formliners require suitable and sound foundation to be placed upon. Plywood should be of minimum quality 'Douglas fir fair faced one side'. In pre-cast applications you may place the formliners loose into horizontal moulds, formwork or tilting tables or you can glue them. For vertical applications (in-situ concrete, battery-shutters) we strongly advise that you glue them to the shutter. For gluing use RECKLI Formliner Adhesive with suitable RECKLI primers if and when advised by RECKLI. The type, and quality of concrete do not limit in any way the use and application of RECKLI Formliners. it is immaterial whether the concrete is standard concrete or one using heavy or lightweight aggregates, white cement, and colored concrete or concrete with pigments. RECKLI Formliners can also be used with self-compacting concrete, fibre reinforced concretes such as glass fibres, polypropylene, textiles, steel etc. it has been used successfully for many years in the GRC industry.

Reusability

RECKLI use different Elastomers for their standard formliners. The differences are dependent upon the type of formliner produced. The prefix number which identifies the formliner pattern notes the material difference. The formliner pattern is also named. The prefix number 1/.. denotes a formliner type that RECKLI state is suitable for 50 reuses. The formliners with the index number 2/.. have less pattern depth and therefore less overall thickness than the 1/.. formliners. The 2/.. formliners are made from an Elastomer which allows a guaranteed 100 reuses. The stated reusability is derived from over 35 years experience in the manufacture of our formliners. Under suitable conditions and careful handling much higher reusability values have been recorded.

Pattern design

There is no intended repeatability (with the exception of any of the rib type patterns) in the formliner patterns within the maximum mould size as compared to wallpapers. A number of patterns are designed in a way that they can be placed together side by side in the horizontal (especially the rib patterns) continuously. With a little care the vertical joints in the rib patterns can be made almost invisible.lt is essential that attention be paid to both pattern sequence and pattern direction in all designs, especially when elements are to be arranged side by side or one upon another when there is a requirement for the finish to appear seamless. Unintentional rotation of the formliners by 1800 for example can lead to unwanted conflicting visual effects.

Pattern choice

The photos in our pattern book show concrete elements cast from our formliners from a typical area of the pattern The sectional drawings shown below the photos are of the formliner. Due to limited space we have used different scales for the drawings.
As even the best photo cannot always give a life-like and true scale impression of the patterns characteristics we recommend that a pattern sample be requested for casting of a trial element and thereby confirm to yourselves the pattern or texture required. We will loan planners and contractors formliner samples (approx. 50 x 50 cm) for help in pattern selection and any other criteria such as, concrete with a high heat development, striking/stripping sequences, concrete composition and consistency and to check the incorporation of formliner joints and 'stop ends'.

Measurements and Tolerances

For the building of our master moulds we use a combination of natural and man made materials of commercial grade quality which are formed using current standard working practices. Unavoidable tolerances, discrepancies and imperfections caused by the use of these materials can and will be reflected in the patterns of the formliners.
Despite the most carefully controlled production operation dimensional tolerances of some mm in the rear wall thickness of the formliners are unavoidable. This is due to material and production factors which we are unable to negate. These dimensional differences are unavoidable whether you have a formliner produced in its maximum size or a smaller 'made to measure' formliner within the maximum size of the same formliner.
As is the case with all highly elastic rubber-like materials formliners that are laid out loosely (not fixed) are subject to stretching or shrinkage due to temperature differences. You can compensate for these small measurement changes by re stretching or compressing the formliners at the time of fixing.
The measurements shown in the sectional drawing under the pattern photos in this book are average values and nominal dimensions which have the stated tolerances. In using these sizes for the calculation of your requirements you should not expect that there is an equal repetition of measurements within the same formliner. The same criteria will apply whether you place two full sizes sheet formliners together or two or more 'made to measure' (smaller) formliners.
The maximum size that the formliners are produced in are shown under the pattern photographs. All measurements are approx. figures.
The liners with the prefix number 1/.. are supplied flat packed in boxes or on pallets. The width dimension (as shown in photos in the pattern bock) of these formliners is fixed. In the longitudinal direction (Id) (vertical direction of pattern as shown in photos in pattern book) we can supply formliners 'made to measure' within the maximum longitudinal direction (vertical measurement) of each formliner. Depending upon raw materials and due to our production procedure we are unable to avoid tolerances up to
± 1% in length and in width. The minimum order quantity is 1 qm per pattern type.
The liners with the prefix number 2/.. are supplied rolled up on transport and storage heavy duty cardboard rolls. The maximum sizes of these formliners are shown at the side of the catalogue photos. Formliners of this type can be produced and supplied from a minimum size of 1 qm up to the maximum size quoted assuming a rectangle or square shape. Other geometrical shapes and angles can be produced upon request provided a detailed drawing with measurements are supplied. There is a surcharge for this service for which we will be pleased to quote you.
Same formliners with the index number 2/.. are supplied in a fixed format. In this instance the formliner width (picture width) is approx. 1 m. In the longitudinal direction (Id) (picture height) these formliners can be supplied in 1 meter height increments (e.g. 1 m x 2 m Id, 1 m x 3 m Id). When available the sizes of the fixed format type are to be found at the side of the catalogue photos.
While at the packing and transport stage, the formliners with prefix number 2/.. can be subject to minor deviations in measurement as a result of stretching or compression due to their elasticity. For this reason and also to protect the outer edges from damage, the formliners are always supplied a few centimeters larger in Length and width than specifically ordered. The formliners can then be cut to size at site..

Cutting

The formliners with the prefix number 1/.. can cut with a circular power saw or panel saw. To cut the formliners with the prefix number 2/.. you should use our RECKLI Formliner Knife. When cutting formliners please use a 'straight edge' to ensure a straight cut..

Release Agents

Before each use the formliners rust be provided with sufficient RECKLI-Stripping Wax to ensure a complete and thorough release. Depending upon the requirements and type of application, we make and supply 3 different types of Stripping Wax which are Type TL, Type TL-SO and Type TL/W. Please refer to RECKLI with details of your application so that we may advise you of the correct type.

Releasing of Formliners

We recommend that releasing/striking of the formliners takes place as soon as possible within the recommended criteria for the particular application for which the formliners are being used. If the formliner remains on the concrete for a longer period of time, adverse conditions can result in a vacuum being created between the formliner face and the concrete which increases the longer the formliner remains on the concrete. This can complicate the release/striking process and possibly render it virtually impossible.

Resistance to Temperature

The formliners can used in temperatures up to + 65° C. Temperatures which exceed this value will damage the material. Should you expect a concrete temperature on the interface to the formliner of more than + 65° C due to the concrete mass, production technology, surrounding temperature or other circumstances, the mix design should be adjusted to allow for the safe use of the formliner within its temperature constraints.

Storage

The formliners must be protected against intensive weathering such as UV light, rain, frost and any other aggressive conditions. This is best accomplished by covering with dark or black polyethylene sheets.
All formliners must be stored an a level foundation and kept dry. The moving and transport of the formliners with the pref ix number 2/.. should only be performed by using the transport and storage jackets (heavy duty cardboard rolls). Handling with sharp and pointed objects is to be avoided..

Application Guide Line

Please refer to our extensive fixing and application directive which is available to purchasers of our formliners.

Special Projects

The patterns illustrated in this catalogue represent our standard program. In our illustrated Documentation brochure you will notice many instances of special moulds. These are the projects of architects, artists and contractors own conceptions and designs which we have produced for them and for which RECKLI have many years experience throughout the world. Our pattern and mould making shop can support you in realizing your plans. We would be pleased of the opportunity to quote you for your own special project.

Formliners for Single Use

We also have available RECKLI-OneTimer formliners. Please ask for our separate catalogue.

Making your own Formliners

For producing your own formliners we manufacture and supply the Elastomers and all accessories required to complete this task. Please ask for our advice.

Reservation of Rights

We reserve all rights to technical modifications due to continuous development of materials, pattern size and design. Our production moulds must be renewed from time to time due to normal wear and tear. it is unavoidable that small pattern changes will take place.