When rendering the external wall of a property a contractor will try to identify any peeling, onset of damp and faded colours, flaking and cracks in order repair of any damaged stucco surfaces, pebble-dash, or damaged brick, unpainted or painted, untreated or treated.

external wall rendering

Benefits Of Wall Rendering

Many people wonder if it worth investing money in wall rendering. Bellow you can see the most important reasons:

  • Reduce head loss.
  • Cover unsightly fissures or cracks.
  • Make surface more durable and waterproof.
  • Enhance resistance to fungi, algae and mould.

What entails rendering walls?

Simply put, wall rendering, involves coating the surface with cement or plasters finish on external or even internal walls with a sand and cement mix. As mentioned above, while it is mainly for restoration and protection against the external environment, for thermal and sound insulation and also for decorative purposes.

What is the best weather to render a wall?

When rendering exterior walls, consider weather conditions. That is extremely crucial, more so, when it comes to the external walls. If the weather is too hot, the materials might set in too quickly which might leads to cracking. On the other hand, if the weather is too cold, it will cause the materials to slide down making it a very messy job.

That’s why it is best to choose a rather pleasant day, maybe even cloudy with no chances of rain. Cement based renders on walls, not only improve the appearance of the house but also waterproofing and fire rating. To get the best possible results the contractor needs to use the most appropriate mixture for the surface that is being rendered and also apply to each layer the right thickness.

Wall rendering preparation process

How To Prepare Surfaces for Rendering

The better you prepare the surface before the new render is applied, the better the result will be. Walls are usually previously rendered when building but over time it deteriorates. So you need to:

Remove external grime: Ensure that all sorts of external grime like dust, dirt, grease, oil or any other easily crumbled material is washed away.

Remove old render: Begin by sawing so that much of the old render is removed.

Wet the wall: Once that is done, use a garden hose to wet the entire wall. If the wall is made from porous materials, spray a lot more water on it.

Further advice:

  • Absorbent walls made out of sandstone require more soaking preventing water loss.
  • Before any application of the render materials, smoothening the surface with a “dash coat” is considered a good idea.
  • Dash coats are just a mix of cement and water in order to create a firm grip. Make sure the material is free of any feces.
  • Leave the dash coat to dry for at least 24 hours before you apply any render.
  • Remember to coat horizontal as opposed to vertical to prevent it falling down.

How to choose the best rendering materials

Choosing the best possible rendering materials is of high-importance.  For example, using Portland cement render on walls made out of earth will trap moisture and as a result will weaken the material. Know you’re walls before buying any products!

How to mix renders

  • Read the manufacturer’s guidelines carefully before getting started.
  • Measure the quantities carefully.
  • When mixing render, wear gloves if you are not mixing on a flat and hard surface.
  • Add water gradually when mixing the render.
  • Mix enough render for at least 4o minutes of work.
  •  Make sure the colour needs to be uniform when the mixing is complete.
  • The end result needs to be soft but not too wet because it will just slide off the wall.
  • Do not apply the render till you’ve reached the desired thickness while using a leveler to smooth it over.

Exterior Finishing Options 

Textured finish: There are a number of finishing effects that can be achieved with the final coat. If you desire a textured finish, add a coarser aggregate to the final coat.

View ideas on Google

Patterned finish: For a more patterned finish, use a ball on the surface before it dries. The ball will have to be moved around according to the pattern desired.

View ideas on Google

Towel finish: A trowel finish can be achieved by skimming a wooden float on the final coat. The options are limitless if you use your imagination!

Types of render materials

If you couldn’t be bothered with multiple coats and require fast application, Weber.pral offers one coat, ready mixes which are not only weather resistant but also colored and applicable to brick and blockwork. It only requires water to be mixed in. Weber render prices are between 30/100 quid per square meter.

More advanced renders can be applied in just one coat which are called ‘monocouche’ renders, a French term. Monocouche renders have additives making them more flexible and prevent cracking. But monocouche render prices are ludicrous and can cost up to 80 quid per square meter. On the other hand, if you decide to go with a render that is suitable for outdoors as well as indoors, acrylic rendering would be the right choice because it also facilitates brickwork repairs.

Weber Render Prices

A popular Do It Yourself external rendering option is Weber, bellow you can a summary for the weber render prices to help you get started.

Monocouche renders according the catalogues of Web Render cost from £22.24 for a 25 kg bag.

Basecoat renders prices range from £8.50 to £19.46 for a 25 kg bag.

Topcoat renders cost from £10.13 to £21.35 for a 25 kg bag.

Stipple coats cost from £19.43 to £21.35 for a 25 kg bag.

For more information see their catalogue here

What is the cost of rendering External walls?

Well, prices for rendering vary based on size of the property or the selected wall and kind of rendering work that you want; the table given below will outline several different jobs including the acrylic render price and lime render cost that is offered by mist contractors thereby providing you an idea as to how much time each renovation will likely last as well as how much will it cost:

Rendering Job

Description

Guarantee

Price range (£ per m²)

Pro-Clear Coating

A cleaner, brighter fresh look for spoiled, crumbling, or dull brickwork.

5 year

35-40

Repoint and Clear Coating

A brighter new appearance for peeled paint of hairline fractures.

5 year

35-45

Masonry Paint Coating

Repair to porous brickwork and renovation of dull look.

5 year

35-45

Textured Wall Coating

Repair of patchy, cracked mortar or crumbling brickwork or improper paintwork.

15 year

40-45

Acrylic Render

An overall paint surface rendering

15 year

45-75

Hydraulic Lime Render

Best for soft, chalky crumbling wall material and slow-setting for avoiding further cracking.

15 year

 35-50

Monocouche Render

Faster application for tough, industrial buildings.

20 year

 35-7 0

GRC Reinforced Fibre Glass

Reducing permeability of the windows as well as door panels. Durable and Strong

25 year

65-80

Flexible Synthetic Silicone

A render penetrating damp as well as condensation with enhanced anti-crack finish.

25 year

40-60

Eco-wall Render Insulation

External wall insulation for reducing heat loss as well as lowers CO² emissions thereby prolonging life of the property.

25 year

85-100

Don’t forget that the specific wall rendering choices are just typical to single contractor and though several similar kinds of rendering can easily be found under alternative labels or names, one must always look out for more specific wall rendering possibilities. In this way one reduces rendering expense by just paying for what exactly their surface requires and hence don’t invest more than what one can afford.

Complete house rendering charge can ultimately turn out to be expensive house improvement project, individuals must think that it’s an investment instead of thinking that it is luxurious spend; after all, it will enhance your living standards as well as add value to the property in longer run! Simply ensure that you compare several quotes from several different contractors to as to make sure that you are getting best deal.

References

https://www.realhomesmagazine.co.uk/advice/rendering-external-walls/

http://www.diydoctor.org.uk/projects/rendering-exterior-walls.htm

https://en.wikipedia.org/wiki/Cement_render

http://www.telegraph.co.uk/lifestyle/interiors/jeffhowell/5475785/Jeff-Howells-DIY-advice-external-wall-coatings-and-repointing.html

 

image source: www.parex.co.uk

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