The glaster roughcast is developed as an external render - the increased surface area is an extremely effective way of shedding water so was traditionally widely used on coasts as well as exposed buildings like castles. The glaster roughcast is made with a coarser recycled glass aggregate so is widely used for its 'greener' credentials!
This plaster is made from a high calcium fat lime putty blended with a coarse recycled glass aggregate, it therefore provides a unique decorative finish or it can be painted with a breathable paint.
It is supplied as a wet premix which will simply requires 'knocking-up' on site using a mill or site mixer prior to use. It can be spray or hand applied in single coats!
Availability : 1 tonne bulk bags or 20 litre buckets.
This product qualifies for our bulk order discounts, the more points you collect, the more discount you will receive!
This product can also be coloured, see options as for self coloured finish plaster.
Every effort has been made to ensure the accuracy of the colour and texture
of products on this website but due to the limitations of technology,
we strongly recommend that sample products are purchased for testing in situ
prior to the full order being placed.
- will help to control condensation and damp, thus creating a healthier building by controlling relative humidity
enable other sustainable building materials to be used such as wood, straw, woodfibre boards, clay and earth
- can be recycled at the end of its useful life and will allow other building components to be reclaimed
- technically excellent with some performance advantages over sand based equivalents
- is versatile – it can be hand or spray applied to stone, brick, laths or wood wool boards
- produces a unique aesthetic by combining different colours of glass with pigments
- reduces the demand for sand (currently 2 million tonnes per annum are extracted depleting a natural resource). For every tonne of recycled glass used, 1.2 tonnes of raw materials are preserved.
- reduces the amount of glass going to landfill. Although glass is not directly hazardous to the environment, it will remain there indefinitely, so it helps to develop a market for the 8% of household waste.
- this product is made in our manufacturing yard that operates under our iso9001:2008 quality management system and the Green Dragon Level 2 environment standard.
“30 gallons of oil are saved for every tonne of glass which is recycled. “ Friends of the Earth
What are the environmental benefits of Glaster?
The award-winning Glaster products are beneficial to the environment because they reduce the extraction of sand whilst developing a market for recycled bottles.
What sort of finish does Glaster give?
Glaster can be varied by adjusting the colour and size of the glass aggregate. Natural pigments can also be added to the lime plaster to vary the background tones. Alternatively, it can be painted like an ordinary lime plaster with our limewash or breathable mineral paints.
Approximately how much Glaster will I need?
Base/Scratch Coats
1 x 25kg bag covers 1sqm @ 7-8mm thick
1 tonne covers 40sqm @ 7 – 8mm thick
Finish Coats
1 x 25kg bag covers 3sqm @ 3mm thick
1 tonne covers 120sqm @ 3 mm thick
What protective precautions should be taken whilst drying?
• Protect new work with dampened hessian first with plastic sheeting on the outside to prevent rapid drying in warm weather, particularly when windy or in direct sunlight. Gently spraying the render and hessian sheeting with water will help to slow the drying process.
• Do not use dehumidifiers and heaters to speed up the drying process. Accelerated drying will prevent carbonation (which takes place in the presence of air and moisture) and may cause the plaster / render to fail.
• Protect new work from frost. External work, wherever possible should not be carried out in temperatures of 5°C and falling. Internally, it may be appropriate to heat the room gently using a convection or gas on a ‘LOW’ setting. In winter, externally, the scaffold should be fully enclosed and well-circulated heating supplied.
• Protect new render from rain. Rain can wash the lime out, or at least draw it to the surface before carbonation has taken place. A new render should be protected until surface carbonation has taken place.
How should it be stored?
It should ideally be used within ONE month. Pre-mixed glaster (putty) given time will become solid in the bag and take more effort to chop up with a shovel and ‘knock up’ in the mixer, in which case a mortar mill can be more favourable. Note: Premixed Dry glaster (Hydraulic Lime) should be stored indoors in a dry place.
This section is under development, please email tymawr@lime.org.uk for systems builds and NBS clauses.
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