Blocks of any type or grade are not waterproof or weatherproof and must be rendered or cladded if used on an external leaf. Rendering onto our concrete blocks is a proven, simple and cost-effective way in achieving a waterproof, durable and attractive external finish.
Can you render straight onto breeze blocks?
Hi you need to unibond wall first (PVA) couple of coats wait for it to dry then apply a coat of render and scratch it so second coat has something to key to called a scratch coat then apply a second coat try and get it as flat as you can. when nearly dry rub over it with a damp sponge and you will get a good finish.
How do you plaster a breeze block wall?
How do you render an external block wall?
- A mixer is the best way to mix sand and cement render.
- Screed battens fixed to wall to help level render.
- Use a straight edge to level up render.
- The first coat of render is also called the scratch coat.
- Scratching comb for keying first coat for better bond to second coat.
Should breeze blocks be rendered? – Related Questions
How much does it cost to render a garden wall?
The approximate cost for rendering garden walls may be between £25 to £40/m2. It is advised to install the lighting before you get an external wall rendered of the garden. Depending on the height of the wall, you might need scaffolding.
What materials do I need to render an outside wall?
Materials For Rendering A Wall
- Plastering Sand (make sure it’s plastering sand and nothing else)
- Cement.
- Water Proofers.
- Feb Render Mix.
- Hydrogenated Lime.
- Water.
How do you finish a cinder block exterior wall?
How to Cover Exterior Cinder Block Walls
- Using Concrete.
- Adding Stucco.
- Covering the Wall with Vinyl Siding.
- Installing Stone Veneer.
What is the mix for rendering external wall?
Most renders are typically made up of sand, water, cement, and lime. A standard ratio used in creating this mix is 6 parts sand, 1 part cement, and 1 part lime (6:1:1). There is no particular type of cement that should be used; any kind will do.
What is the best external render?
Silicone. Silicone external renders have gained the most popularity in recent years since it offers so much more than the more traditional solutions. It is a silicone resin-based render, which has been mixed with silicone to provide much better performance and durability.
What is the best external render mix?
Why lime helps make the best mix for rendering. Instead, we make a 6:1:1 which is six parts of sand, one part of cement and one part of hydrated lime. The sand must be plastering sand or rendering sand, not building sand – do not use building sand for rendering because it shrinks and cracks.
Does render need 2 coats?
Rendering is much like plastering where as you need to apply two coats if your using sand and cement. The first coat is a scratch coat where thats laid on and then scratched to create key for the next coat.
What is the minimum thickness for render?
Render should have a nominal total finished thickness of not less than: 16mm for sheltered and moderate exposure zones, or. 20mm for severe and very severe exposure zones.
How long should external rendering last?
A typical render has a useful life of around 30 years while the external renders, however, have a shelf life just like many other finishing materials. For instance, some contemporary acrylic- or plastic-based renders should last 20 to 40 years.
What causes render to fall off?
This can happen either as a result of cracks in the render, or moisture seeping through the wall. Render is traditionally a mix of sand and cement and sometimes lime or plasticiser, with a slightly higher ratio of cement to sand than a normal mortar mix used to lay bricks.
What time of year is best for rendering?
Most traditional render systems have a better finish if applied in regular weather conditions – ideally between 5oC and 25oC, with no rain, wind or snow. However, sometimes this might prove difficult, especially during summertime.
Is rendering high maintenance?
Rendering is low maintenance because it only needs work every ten years or so, but it is still something that you have to keep up with. All render types are known to eventually develop hairline cracks, mainly when the underlying brickwork is old or was damp at the time of application.
Is breeze block and render cheaper than brick?
Expensive: Using concrete blocks and render is generally considered less expensive than traditional brick, particularly for new builds.
Will render fall off?
There are a number of reasons why this could happen ,yes if the render has not got the right ratio of mix it could effect the life span and strength of render . but also if there is moisture trapped between block wall and render this can freeze and also cause this affect .