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Cement Renderers in Devonport, 7310, TAS
Devonport
On Date - Wed, 23, Sep
I have an exterior concrete hollow block wall of which I want to render. The wall is 10 m in length and 2.5 m in height
B
Brendan
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Answers to Your Common Questions
How long does cement rendering last?
When applied professionally and maintained properly, cement render can last 20 to 40 years. Longevity depends on the quality of materials used, exposure to weather, and whether cracks or damp issues are addressed early. Protective coatings or painting also help extend its lifespan.
Can I paint over cement render?
Yes, you can paint over cement render, but only after it has fully cured, which usually takes around 28 days. Using breathable exterior paint is essential to prevent trapped moisture. A primer is recommended to improve adhesion and finish quality.
Is cement rendering waterproof?
Cement render is not 100% waterproof, but it is water-resistant. For areas exposed to heavy rain or moisture, additives or waterproof topcoats can enhance protection. If waterproofing is a major concern, acrylic render is a better choice due to its superior water resistance.
What’s the difference between rendering and plastering?
Rendering is used for external walls, made from sand, cement, lime, or acrylic, and designed to withstand outdoor conditions. Plastering is an internal wall finish, using finer materials like gypsum for a smooth interior look. Rendering is rougher and more durable, while plastering is refined and decorative.
How much does exterior vs. interior rendering cost?
Exterior rendering generally costs $30–$60 per m², depending on the finish and wall condition. Interior rendering, which is less common, costs around $20–$50 per m². Factors such as height access, room ventilation, and prep work can influence the cost.
How much do renderers charge per square metre?
Renderers typically charge $30 to $70 per m², depending on the complexity of the surface, the type of render (cement vs. acrylic), the number of coats, and the location. Some charge additional fees for prep work like crack repairs or mesh installation.
What are the advantages of cement rendering?
Cement rendering adds a modern and clean appearance to homes, increases weather resistance, and improves thermal insulation when combined with proper wall materials. It also covers surface imperfections, making old walls look new again, and adds property value.
How much does a 20kg bag of render cover?
A 20kg bag of render covers approximately 2.5 to 4 square metres, depending on the wall texture, number of coats, and render thickness. Rough or absorbent surfaces may require more material, while smooth walls use less.
How thick should 2 coats of render be?
Typically, a two-coat cement render should be 10 to 15mm thick in total. The first (scratch) coat is 8–10mm for strength and grip, while the second (finish) coat is 2–5mm, depending on the desired smoothness or texture.
Is acrylic render better than cement render?
Acrylic render is more flexible, crack-resistant, and dries faster than traditional cement render. It's ideal for modern homes and high-moisture areas. However, it’s more expensive. Cement render is more budget-friendly and works well on brick, concrete, and block walls.
How to stop sand and cement render from cracking?
Prevent cracking by using the correct mix ratio, allowing proper curing time between coats, and avoiding rendering during extreme weather. Incorporating fibreglass mesh, applying a bonding agent, and ensuring stable wall foundations also reduce cracking risk.
How do I calculate how much render I need?
Measure the height x width of each wall to get the total square metres. Divide the total area by the coverage rate (usually 3m² per 20kg bag). Add 10–15% extra for waste, surface irregularities, or intricate detailing.
How long does cement rendering take?
Rendering a typical house can take 3 to 7 days, depending on the number of walls, size, weather, and type of render. Acrylic dries faster than cement render. Add curing time (up to 28 days) before painting or applying final finishes.
How much will it cost to render my house?
Rendering an average-sized 3-bedroom home (around 250m² of exterior walls) can cost between $7,500 and $15,000, depending on the finish, access requirements, number of coats, and whether it's a single or double-storey property.
