lime render cost

What is Lime Render – Benefits & Proccess

When it comes to rendering their home, many people do not realise that lime render can also be an option. Some people are not aware of how important lime rendering on a wall can be. Lime render is a type of render mixed with lime materials that can be applied to the building’s wall to protect it from the elements. Rendering is the process of applying the product.

Old masonry buildings commonly require external wall rendering. Besides, it can be used with other building material types as well.

Benefits of Lime render

Lime render offers several benefits. Here are some of them which make you give lime a go whether you are renovating your home, exploring options, or working on a new building:

Lime plaster is vapour permeable

Lime render is breathable due to the high vapour permeability. Air can pass through it in a way that is not possible with denser materials such as polymer-based renders of cement render. It allows the building to breathe so that moisture can escape its formation. Moisture or water is the enemy fir your home that can damage timber, iron, and stone. Lime should be your first choice if you want to protect your building and retain structural integrity.

lime rendering house

Prevents condensation

When you use lime mortar for building, you will not see condensation on the surface walls. When used limewash, lime has disinfected qualities, but the same is also true for lime renders mortars and plasters. It resists the build-up of moulds that can lead to breathing difficulties creating a healthy environment for living. This makes lime render an ideal material for the building, especially when you and your family have any respiratory issues or allergies.

Lime Render moves

Lime render is much more flexible than gypsum or cement renders. It means it can accommodate subtle movements, especially when used with animal hair or fibre in the mix. It is more resilient to cracking, which is useful if your house moves with the season as most of them do.

Environmentally friendly

Lime absorbs potential damaging carbon dioxide from the atmosphere. The amount of energy required to produce it in the first place is lesser than what is required for cement production. Besides, it can be produced on a small scale, not impacting the local area. Moreover, lime does not leach damaging chemicals as it is a natural material.

lime rendering external walls

 

How to Lime Render?

When given little guidance and tuition an amateur can also possibly render lime. However, the work needs to be carried out properly. When everything is perfect and straight, the traditional building rarely looks right. So, you can work knowing that it wouldn’t look out of place.

Preparation of the Wall is the Key

The application, successful bonding, and hardening of lime render need the background to be free of containments, vegetation-free, clean, and dry all around the wall mass. The surface of the wall should be sound structurally, and the bedding and masonry must be in fine condition.

The different dubbing out coat application shouldn’t be considered as remedial to the brickwork or masonry background. The replacement of open joints or damaged or missing masonry must be repaired prior to the application of any dubbing coats. Wherever you find unevenness or excessive hollow, the areas must be rectified by applying lime mortar and brick or stone slips into the mortar. It will result in a reasonably flat background surface before you commence rendering.

Avoid the pitfalls of lime rendering

Lime renders don’t require due care during their application. They can fail from shrinkage, weather damage or drying back too quickly during their early stages. But, when applied properly, they will offer both decoration and protection to any structure. You can avoid failure through basic preparation. Besides, observation and planning are also recommended strongly at the outset.

Bonding and Suction Control

Whether hydraulic or non-hydraulic, it is crucial to check the suction degree before you apply the new lime coating. Excessive or poor suction can lead to weak bonding with the substrate caused by quick drying of the applied render. It will result in powdery and weak interface resulting in failing and separation at later stages. You require to bond the coating to the substrate.

Wetting down is required near waterproof masonry or dense blocks when you want to control the suction. Use a mist spray to dampen the surface but only on porous ones like old brickwork.

Before you start to render, wet the wall using a hose, from top to downwards. It may also require to be carried out several times in a day.

Why Do You Need Suction Control?

The main purpose of the suction control is to accomplish a damp surface and not wet. The surface should not have standing nor running water on the brick or masonry as it forms a barrier between the substrate and the coating.

Moreover, the lime mortars stiffen and adhere across a certain suction amount.

For the waterproof or dense background, applying lime or sand splatter dash coat or harled coat may be vital for the mechanical key.

Rendering cost

 

Rendering Techniques

First Coat (Bonding Coat)

Apply uniform thickness of lime render of around 9 to 12 mm on any surface. It is suggested to throw, cast or harl to get the best results. Cast-on coat materials should be wetter and grittier than normal rendering. The thrown coat will offer an appropriate bonding coat for the scratch coat. It provides a superior bond from casting on and is less likely to delaminate from the substrate. It greatly emphasises impervious surfaces like engineering brick or granite and porous surfaces like soft brick or cob.

Though lime mortars are quite cohesive, they require more effort than the cement renders. Apply the first coat using a laying-on trowel and pressure to press it into or on the wall. The application must be uniform and should not be straightened or overworked too much.

Second Coat

The second coat is known as the floating coat. It is used to straighten to make sure an even and flat surface. After it, the coat is scoured up with a polyurethane or timber float. In normal conditions, it takes about a week. There is no such rule, but the damp surfaces take longer to harden up. The work is further straightened to produce the desired level of render finish.

After the render is set, rub up with a normal float and end with devil float score slightly.

what is lime rendering

 

Final Coat

Known as the setting coat, the final coat is treated the same as the previous coats, assuming any straightening required has been carried out before this point. Avoid rubbing up the work too soon after it has been laid. Try to leave it for as long as possible. Topcoat plaster will have more lime content and finer sand. If you work on lime mortars too soon, it results in the puling of free lime to the surface. It may lead to failure as the properties of the material are compromised.

Besides, the thickness of the topcoat plays an important role. It shouldn’t be thicker than 5 to 7mm.

Some applications use natural hydraulic lime renders. The technique is the same as mentioned in the above guidelines.

Lime plaster or render is a great option for your house. Avoid the use of modern paint to lime render. If you want to get the lime render done for your home in the UK by a professional, you can contact us. Visit our rendering page here: https://advanceddamp.co.uk/rendering-company/

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