Frequently Asked Questions

  • Why use Lime on old buildings?

    Old buildings need to be able to 'Breathe'. Also pointing and renders should always be weaker and hence sacrificial to the building stone material.

  • What does the Cornish Lime Company charge for delivery?

    The extensive range of products combined with Geographic Location makes Delivery Charges a science in itself. The delivery costs for each individual order are worked out according to a combination of weight, size and location. Please let us know what products you need and we will calculate the shipping for you.

  • What is the difference between Hydraulic and Non-Hydraulic Lime?

    The main difference between hydraulic and non-hydraulic limes (Lime putty and hydrated lime) is that hydraulic limes can set under water via chemical reactions within the mortar, whereas non-hydraulic limes can only set via Carbonation (absorbing CO² from the atmosphere).

  • When should I use Putties and when should I use Hydrated Non-Hydraulic limes?

    Generally Putty limes are far superior to hydrated non-hydraulic limes because the maturing process means that they develop an excellent crystal structure, which gives them an exceptional workability and a better chance of successful application. However the hydrated types of non-hydraulic limes are a lot cheaper and there are certain circumstances in which their use may be preferable because of this, such as some mass walling applications.

  • Are these traditional lime products more expensive than modern cements and gypsum?

    Although at face value limes appear a lot more expensive than cement there is in fact very little difference. This is because when mixing you measure by volume and not weight.

  • What is wrong with cement mortar?

    Everything that has made cement a brilliant modern building tool (High strength, impermeability, high density) makes it completely inappropriate for the repair of old buildings.

  • Are Cornish Lime able to help me choose the right products for my particular job?

    Yes of course, we have over 25 years of experience in repairing and restoring this countries building heritage. You will get good sound advice ensuring the right compatible materials are suppled for your project.

  • Is there a Waterproof Cement?

    Yes, Cornish Lime imports a Natural Cement, “Prompt” which when mixed to the appropriate gauging will set under water. This Waterproof Cement has been used extensively across France and Italy for countless works where a waterproof mortar or concrete is needed. Working with cement in wet or marine locations such as Harbour Walls, Drainage Culverts, silage clamps, in fact anywhere that a waterproof setting Cement is required, Prompt can meet such demands.

  • What should I use when I need a Rapid Setting Cement?

    Cornish Lime imports a Natural Cement, “Prompt” which has been around since for more than 150 years in France that can offer a near flash set, in less than 90 seconds if mixed with warm water, or the set can be delayed with the addition of Tempo; a citric acid that retards the set without compromising the mechanical properties of the mortar. By simply adjusting the amount of Prompt used or the addition of Tempo setting time for the mix can be adjusted with a range from 90 seconds to 30 minutes.

  • Are Lime mortars a lot harder to use than cement based ones?

    The simple answer to this is no. It is true that they do require preparation of the background before application and extra care after, however this is very simple and takes very little time.

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