Technical

Calfe Crimmings supply and install

Hopper resin based plasters from the USA

Novacolor lime based plasters from Italy

Materials

• Hopper finishes consist of 100% pure polymers, colourants, finely ground marble dust, fine silica sands mixed with cement and binders.
• The Novacolor plasters consist of aged lime-putty, selected inerts (marble dust, mica), earth pigments and rheologic modifiers

Substrates

• Acceptable substrates include drylining / plasterboard (taped and sanded ready for paint), masonary, concrete, plaster and wood. Additional substrates may be subject to special preparation before plasters are installed
• All substrates must be dry and dust free prior and during application
• Substrates other than those listed shall be approved by Calfe Crimmings
• Contractors should check with Calfe Crimmings the suitability of the substrate prior to commencement of its installation.

Finishes

• All finishes are hand trowel applied
• No expansion joints are required for the finishes unless needed for the substrate
• Hopper andNovacolor finishes are suitable for interior and exterior use
• All plasters can be used in wet areas
• For exteriors the substrate should be waterproof cement render
• Wax finishes may only be used internally
• All finished surfaces are treated with Novachem solution. This dries to a micro-porous finish enabling the plasters to breath yet still providing an impact resistant surface which is washable and easily maintained
• Drying time between application of plaster coats is normally 24 hours

Quality Assurance and Conditions

• All finishes are only supplied and installed by Calfe Crimmings
• Samples are provided for approval during specification
• Where required, an on-site test area may be recommended for approval prior to commencement of work

The use of natural materials and hand crafted application requires specific on-site conditions to reproduce the sample finishes used in the specification process - details of these conditions are set below.

1. Substrates must be completely prepared prior to site attendance
2. Any plasterboard, dry lining system, MDF sheeting and the like intended to form a substrate for our finishes must be fixed and prepared in accordance with the manufacturers recommendations
3. All substrates to be finished by us should be flat true to line and plane and it is the responsibility of the Main Contractor/Client to prepare all such surfaces including the removal of all nibs, fins and mould release agents. Surfaces should be free from dust/grit. Our prices do not include for the feathering or dubbing out of the background imperfections. Hopper and Novacolor material finishes are 2-4mm thick and will not tolerate substrate imperfections
4. The Main Contractor / Client shall provide, free of charge, lighting of a level sufficient for the efficient completion of our works to the required standard. Where possible, this should be the lighting intended for the building when in use
5. We do not require vacant possession of areas to be complete in Hopper or Novacolor materials, however we do require reasonable access to execute our works without interruptions from other trades
6. It is advisable that Hopper and Novacolor materials are installed as late in Main Contractor's programme as possible, and certainly within the decorative finishes programme