We offer our personal assurance that we will carry out the best job we can. We take pride in the work of lime and believe in this age old product. It is not the easiest material to work with but we have chosen to because we believe it does the best job.
We are unable to offer any guarantee on our work as there are simply too many variables that can affect both the aesthetic and structural properties of a lime plaster or mortar. For example; if a capping stone is dislodge or damaged this can lead to a leak in the wall and will then damage any lime pointing or rendering work carried out, guttering problems also cause issues with renders.
The reality is that lots of building firms that use modern materials such as cement, k-rend, and parex etc, offer guarantees on their work, but in our experience there is always a get out clause and they very rarely rectify any work or provide any form of discount or refund.
Most definitely not! Any impervious material, such as concrete, plastics and tanking solutions should not be used on a building built in lime mortar. They will trap moisture, or in the case of a concrete floor push any moisture present in the floor up the walls. A better flooring solution would be to install alimecrete or sublime flooring system.
Simply breathability and flexibility. Cement is incredibly strong, which also makes it rigid and in-flexible. Lime on the other hand is highly breathable, and due to its fibrous content, is also very flexible.
Read our Why Use Lime? page for more information of visit the Homeowner section at the Society for the Protection of Ancient Buildings (referred to as SPAB) website. 
Any building built pre 1919 is deemed as a heritage property (accounting for one third of the houses in Wales) and would almost certainly have been built using lime mortars and lime plasters. But this of course does not necessarily mean that a building built after this time will not be built in the same way, in fact we work on a lot of new build extensions just to maintain the same aesthetic between the old and new.
Essentially, most buildings erected post war were built with speed being of the essence, hence the increased use and popularity of cements.
Even if the property is built using lime, over the years maintenance works & structural repairs have most likely been carried out using cement, plasterboards, gypsums etc. making it difficult to determine what is beneath it all.
- So to find out if you need to use lime on your building, either check the land registry documents for your property and check the date of construction, contact Ty Mawr for an assessment or alternatively Contact us to assess the building directly.
Why is the lime plastering process more expensive than using normal cements and gypsums?

What is the difference between lime and cement?

I've been told to install a concrete floor with damp proof membrane and 'tank' my walls, is this a good idea?

What guarantees are provided with work carried out?


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Standard lime putty top coat finish for internal work is more textured than what most people are used to with gypsum (pink plaster) finishes. Lime renders are also more textured than that of a cement render, it actually needs to be relatively open grain in order to be breathable (a biscuit like texture is a common phrase).
The reason for both is down to the aggregate, which is much larger with lime finishing mixes than with modern equivalents. Gypsum is in fact a powder, whereas lime putty topcoat uses a fine silica sand and will therefore have some texture to it.
A combination of factors affect the overall cost difference. Factors such as;
  • Timescale - 1: The application of lime plaster is a more lengthy process, internal works can be up to 2-4 weeks between coats (depending on the time of year and the condition of the building) 2: the stage between removing the cementitous materials and applying the new lime render is also lengthy. Depending on the severity of the damp present in the walls, a period of 4-12 weeks is not uncommon. This gives the moisture (damp) a reasonable start at drying out, and regardless of what plaster is being applied, the walls must always be given time to dry out.
  • Materials - Lime as a binder is in itself more expensive than cement, whether using lime putty or NHLs. But the aggregates used by us are also expensive than the standard sands used for cement. The reason for this is that these aggregates are specifically blended to be used with lime, which is a relatively weak binding agent and therefore requires a well blended aggregate. Lime binders combined with 'normal' building/plastering sands make for a very weak mix. Finally, the addition of a fibre is also costly. Depending on whether the work is internal or external, or if the work is on a listed property, this fibre is likely to be either a natural hair, such as horse or goat, or a synthetic fibre.
  • Care - Every external render is extensively cared for and protected from the elements. The scaffold is covered in plastic to reduce; the wind drying the plaster to quickly, the rain from weakening the plaster, and frost damage. Inside this plastic, hessian is draped in front of the render , and depending on the time of year this serves to either prevent the render from drying out too quickly (by wetting the hessian), or to keep the temperature up.
What is worth understanding though is not only the difference in longevity, but that of suitability. A cement render applied to a lime mortar based building WILL crack and cause damp, and will most likely last between 4 and eight years. However, a lime render or lime plaster should last the life of the building if properly maintained. The cost of re-doing any cement work to last this long would undoubtedly cost more, not to mention the cost of any damages caused by the damp. 

Here are some of the most common questions that are posed when either providing quotations or sent in as enquiries. The list is by no means inclusive, so if you do have a question of your own, please feel free to contact us.

How do I know if I need to use lime on my house?

What is the finish like with lime, compared to cement and gypsum?