Euro Trend Plastering Renderers Perth – High-end House Rendering Services Perth
Rendering is an important part of both external and internal construction. A high performance improvement in the construction work is possible if the house rendering Perth is proper. An expert rendering services Perth ensures resistance to salt, flexural strength, toughness and adhesion. Low water demand with good workability, resistance to UV degradation, thin set mortar adhesion (stucco, plaster), exterior durability are the appealing features that renderers Perth provide.
Euro Trend Plastering offers new solutions and products to improve their performance and efficiency. To experience the difference from others contact the Euro Trend Plastering team today and get the best service of rendering perth.
INT /EXT CEMENT RENDER
Cement Rendering is widely used in Perth (W.A) in plastering applications to new buildings, homes, industrial projects and to enhance old existing ones to repair and protect fretting mortar between decomposed brick joints. Cement rendering has become very popular due to its strength, low cost, durability against exterior exposure and moisture resistance on interior applications.
There are two types of cement render; EXTERNAL AND INTERNAL.
In external rendering the purpose is to achieve a consistent durable crack free wall finish that is called (sand finish) or applied as a first coat before an acrylic texture coat system.
All exterior cement applications must have a water repellent ad mixture which aids in water ingress protection. Internal cement rendering is predominantly used as a first coat render system to achieve a durable levelling coat over bricks then followed by a plaster set coat.
Render is generally mixed on site by a cement mixer. Combining plasterer’s sand, GP cement, marvelime and water results in a consistent grey in appearance product that is applied by either hand tools or machine. The applied render when semi hardened is levelled and smoothened by drawing a Plasterers screeding rule across the surface.
Coloured cement render finishes are recommended to be applied in a two coat system. The first coat must be a stronger mix and when hardened this surface is scratched or raked with a suitable raking trowel.
This initial process will provide an excellent bond for the final coloured coat. Before the final coat is applied it is essential that the first coat is brushed and lightly sprayed with water to improve adhesion to the substrate. Two coat systems work well when smooth brick surfaces are present and weak bond strength is evident. Initial first coat with a bonding agent admix is highly recommended.
The function of cement is to provide strength and durability. A mix of 1: 1: 6 (cement, lime and sand) for general rendering applications is necessary.
- Using a weaker mix can lead to cracking
- Using a stronger mix can lead to rapid setting which in turn also leads to cracking
The grading of the sand plays an important role in rendering. When cement rendering as a base coat or first coat the coarser sand particles are more advantageous over fine particles, finer sand particles are more suitable for smother one coat systems (sand finish).
It is essential that the mixing is carried out in a methodically controlled manner, careful attention in accurately batching cement products and sparingly adding the required amount of water to the mix to achieve a soft smooth mix, suitable to be applied by trowel onto a brick substrate is significantly related to the quality and durability of the finished render.
Factors that can affect strength in render are; exposure to wind and sun ( heat ) it is essential that adequate protection and cement curing is observed and if required the render must be kept damp to ensure correct cement hydration.
The use of admixtures such as air entraining agents, to improve the workability of the render mix, are known to affect the strength in renders, marvelime is recommended over (calair).
Methods to avoid defects in render are:
- Use all materials in accordance to the plastering standards and manufacturer’s instructions
- All backgrounds must be fully inspected and prepared accordingly (free of all dust and dirt )
- In order to reduce excessive suction over the area to be rendered, it may be necessary to dampen the background the thickness of the render should be between a nominal (15 – 20) m/m for one coat applications.
- Understand different mix proportions or different backgrounds and their correct application to substrates.
EUROTREND PLASTERING adhere to current rendering practices and understand the importance of ”quality, not only in workmanship but also ”quality ” in applying plaster products correctly.
Cement Render Modifiers PLASTERING PERTH W.A
Composites Portland cement, lime and sand based mortars are among the most widely used exterior and interior construction materials for coating masonry and clay blocks. Low cost, high compressive strength, high stiffness, ease of fabrication and non- flammability are the most obvious advantages, whilst low tensile strength, brittleness, flexibility and to some extent, long term durability represent it’s
most serious limitations.
In order for a render to harden properly, it must retain water during the curing process. Only when this happens the Render can reach its full strength potential and ensure cement hydration. Circumstances that promote premature water loss in Render include applications:
- Over highly absorbent substrates
- When ambient temperatures are high, particularly above 30Ã§
- On substrates when there is strong wind.
If render dries out before cement hydration is complete it can also lead to a weak cement finish that may develop surface cracks or mapping.
A high performance improvement to Portland cement mortars is the addition of acrylic polymer’s (re- dispersible powders, based on acrylic pva’s). The function of the polymer is to reduce mortar permeability and increase resistance to salts, flexural strength, toughness and adhesion. Weather resistive additives to the cement – mortar mix are highly recommended, their purpose serve to resist water intrusion while allowing water vapour to escape. Mortars containing Acrylic polymers possess a host of appealing features. Some of the most important are as follows:
- Low water demand with good workability.
- Excellent thin section toughness and adhesion.
- Outstanding resistance to UV degradation.
- Excellent thin set mortar adhesion ( stucco, plaster )
- Exterior durability.
On exterior cladding systems acrylics are highly used for their flexural and adhesive strengths. Cement alone does not have the adhesive characteristics to bond to most substrates but a polymer- render system does. Reinforcing the cement- polymer render with mesh or fibres increases the toughness of the coating and also aids in resistance to crack propagation and tensile strength.
Euro trends ability to offer new solutions and products to improve their performance and efficiency is what differentiates us from our competitors. If you would like more technical criteria or products available for specific applications we can assist.