Internal Lime Top Coat (Finish) Plaster
Ty-Mawr Premixed Lime Top Coat Plaster is a premixed, ready-to-use plaster that simply requires 'knocking-up' prior to use. It is made from our high calcium/non-hydraulic lime blended with carefully selected, fine aggregates which helps to ensure good workability as well as minimal shrinkage. There are different products for internal and external applications - please seek advice if you are unsure what to choose!
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Ty-Mawr Premixed Lime Top Coat Plaster is a premixed, ready-to-use plaster that simply requires 'knocking-up' prior to use.
It is made from our high calcium/non-hydraulic lime blended with carefully selected, fine aggregates which helps to ensure good workability as well as minimal shrinkage.
It requires exposure to Carbon Dioxide in the presence of moisture to harden. It is therefore important to use these plasters at an appropriate time of the year and to protect them from drying too rapidly.
To see an example of this product in use, see our case studies for St Mary's Priory, Abergavenny, Plas Newydd, Llangollen, St Mary's Church, Chalgrove and Somerset Rural Life Museum, Glastonbury.
Click here for our video based application guides
http://tymawr-lime.blogspot.co.uk/p/english-help-guides.html
Preparing the mix
- The plaster needs to be ‘knocked-up’ - a process of chopping, beating and turning which will release some water. Only the minimum amount of water should be added if required to make a workable mix, it should be used as stiff as possible.
- A mortar mill or forced action mixer is the ideal way to ‘knockup’ the lime plaster but this is not always possible. If a bell mixer is used, then it should be left turning for long enough to achieve a suitable consistency without adding water (20- 30 minutes).
- If water is required, it should be added CAUTIOUSLY.
Application
- Internally, lay one thin coat of the Internal Top Coat Plaster at about 3mm onto the surface.
- Once it has firmed up, scour the surface with a well-worn wooden float.
- Lay on the second coat of Lime Top Coat Plaster.
- When this has firmed up, trowel up with a steel trowel, using a light spray of water to remove the fat – do not over trowel.
- If required, wet the surface before working it with the trowel or sponge floats, by misting with water, however over-wetting should be avoided because it will draw too much lime to the surface.
Suitable For
- Internal Top Coats on
- Ty-Mawr Base Coat
- Ty-Mawr Lime Hemp Plaster
Coverage Rate
- 3m2 at 3mm per 25kg bag
- Gives a consistent, accurate mix thus removing the potential for any mixing and gauging errors.
- Minimises waste, enables you to 'knock-up' as much as you require in a day. Anything left over can be reused, so nothing going to waste.
- High quality aggregate selection produces a very workable 'fatty' mix, minimising shrinkage.
- Helps to keep the site organised and clean.
- Their ability to control moisture makes them highly appropriate for use with other ecological materials.
- It is generally accepted that lime plasters can improve the internal environment, regulating humidity by absorbing moisture, unlike modern plasters.
