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A Winter Guide to Lime Renders

In an ideal world, working with lime mortars and renders would take place in conditions not too hot, too cold, too wet or too dry. Unfortunately the British climate and the programme driven modern building industry doesn’t allow for this and work sometimes has to be carried out at times of year and in conditions that are far less than ideal. Here we offer our best tips for working with lime render in winter. However, no amount of well intentioned advice is as sensible as putting the work off until the weather poses less of a threat. This short guide is intended to help in situations where winter work is totally unavoidable.

Where to start working with lime render in winter

Proper thought and planning should be given to the detailing on scaffolding and this should be carefully budgeted for in the contract cost. The scaffolding should be capable of supporting extra covers and project sufficiently above the top lift to offer protection of the work from above the roof-line. However well detailed the outer protection is, water running down inside will create areas of saturation from splash-back along the lines of the scaffold boards.

Wind chill

A good double sheeting of Monoflex or similar will protect against wind driven rain and the effect of wind chill.

Do not underestimate the effect of wind chill. An 8.7mph wind will knock a working temperature of + 5ºC down to -1ºC. At the other extreme, a 31mph wind will take +5ºC down to -12ºC. 

Saturation

Avoid saturation. Saturation is the point at which the pore structure of the render or mortar is full of water. A drop in temperature to freezing point will see that water expand by 9%. That expansion will break apart the surrounding mortar or render. Special attention must be paid to the correct installation of working rainwater goods. 10mm of rain falling on a 25m2 roof will discharge a quarter of a tonne of water.

Over-working

A render with an over-worked, closed-in surface is more likely to suffer from frost damage than a more open textured surface. Freezing is a gradual process occurring from the surface of the render and working inwards. The extra passes of a trowel bring water and fine particles to the surface. For this reason we would recommend that the minimum amount of work is done to an external render once it is flat.

Storage of materials

Thought should also be given to the storage of materials on site, obviously any undercover/indoor space should be used. Dry materials should be kept off the ground. Wet materials, such as sand should be kept on clean, hard surfaces and covered with weighted down tarpaulins to protect from rain and frost.

Using water

Factor in the use of water on site for mixing, cleaning etc. and ensure that if water needs to be stored on site that it is well insulated. Do not use water containing any ice. Never add anything to keep water ice free. Clean down all equipment at the end of the day, do not leave any water standing in mixers etc. Ensure that all pipes are suitably lagged.

Consider your heating

If background heating is to be introduced, propane gas will provide higher humidity as well as a higher level of carbon dioxide. Obvious attention should be paid to the placing of the heaters, not only from a safety/fire risk point of view, but to avoid over heating spots of the render or mortar. Good general circulation of warm air should be the goal to maximise your success with lime render in winter.

Best of Lime products and winter working

At Best of Lime, all of our Dry Readymix products have an element of air entrainment already included. The use of air entrainment has two main benefits: it reduces the amount of water required to achieve workability, and it also increases the air content of the mortar or render to around 14%. This effectively reduces capillarity and gives the space required for the expansion of the frozen water.

This information is for general guidance only and is not specific to any particular site or building. For more specific advice, please contact Best of Lime Ltd.

Testimonials

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"Limecote and Warmcote are ideal products for use on timber framed buildings and low strength substrates with their excellent flexibility, bond, and light weight compared to sanded plasters. Being dry bagged makes it easy to transport and store, with the added advantage of being able to adjust the mix to suit thin or very thick coats without compromising the product, or the quality of the finished work."

Roy Cafferty
Traditional Plastering Services
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"Best Lime plaster system on the market!! I found this accidentally due to the coronavirus pandemic as stocks of everything ran out, and it's changed the way all of the plasterers in our area are now plastering conservation listed buildings as well as new builds... due to its unique formula and characteristics of extremely quick application, drying, workability and breathability. It's rare to find such a great product and more importantly a great level of customer service in the build industry."

Murray Smith
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"As self-builders of a very large community project, Limecote has been an outstanding product, making all the difference to our progress. It keeps well in sealed bags even outside; it mixes easily and safely; being half the weight of sand-based products, it is easy to carry and apply to the walls; excellent adhesion mean that less is dropped and wasted... and not having to constantly limewash going forward make it a no-brainer."

Richard Dormandy
Tulse Hill, London

Why choose Best of Lime?

The Best of Lime materials
At Best of Lime, our traditional lime plaster products are developed under the strict rule that they must be the best of what is available. We continuously listen to and evaluate feedback from specifiers and contractors as to how certain materials perform, both on site and long term.
Our lime plasters, manufactured by us on site in rural East Anglia, are sustainable, environmentally friendly building materials which tick all the requisite conservation and green boxes. We have yet to find anything that they won't stick to, including bricks, wooden lath, straw bale, and stone.
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