Changing an Existing Asbestos Roof to a New Metal Colorbond Roof: What’s Involved, Approvals, Costs, and Moving Out Requirements
Replacing an old asbestos roof with a new, modern metal Colorbond roof is a common home improvement project. Asbestos was widely used in building materials until it was banned due to health risks, and many properties still have these old roofs in place. Although asbestos roofing is durable, it poses significant health risks if disturbed or damaged, which is why it is critical to replace it safely with modern materials. Colorbond roofing, known for its durability, aesthetic appeal, and wide range of colours, is a popular choice for homeowners replacing asbestos roofs.
This article will provide a comprehensive guide to replacing an asbestos roof with a new metal Colorbond roof. We’ll discuss the steps involved, the required approvals, the typical costs, and whether you will need to vacate your property during the replacement process.
What Is Involved in Changing an Asbestos Roof to a New Metal Colorbond Roof?
Replacing an existing asbestos roof involves a number of important steps, both in terms of the physical roof replacement and adhering to safety regulations. Because asbestos is a hazardous material, the process of removal must be done carefully and in compliance with strict guidelines to avoid exposure to harmful fibres.
1. Preliminary Assessment and Planning
Before starting the roof replacement project, a thorough assessment of the existing roof should be conducted by a professional. This includes:
- Inspection for Damage or Deterioration: The condition of the asbestos roof should be evaluated to identify any damage. If the asbestos is in poor condition (e.g., cracking or breaking apart), the risk of fibre release is much higher.
- Choosing the New Roofing Material: In this case, Colorbond metal roofing is a common choice due to its strength, longevity, and aesthetic versatility. The homeowner should decide on the appropriate thickness, colour, and style of Colorbond roofing.
- Engaging Professional Contractors: Removing and replacing an asbestos roof requires skilled contractors who are licensed to handle asbestos-containing materials. Asbestos removalists and roofing professionals will be required to safely remove the old roof and install the new one.
2. Asbestos Roof Removal
Removing an asbestos roof must be carried out in accordance with strict Australian workplace health and safety regulations to avoid contamination and to protect workers and residents. The steps involved include:
- Risk Assessment: A certified asbestos removalist will carry out a risk assessment and create a plan for safe removal. This plan must adhere to the Work Health and Safety (WHS) Act, as well as state-specific regulations such as those provided by Safe Work Australia.
- Safety Precautions: The work site must be appropriately prepared and secured. This includes erecting barriers and using safety signage to ensure no one accidentally enters the area. The removal team will wear protective suits, gloves, and respiratory protection (e.g., PAPR or a full-face respirator).
- Wetting Down the Asbestos: Asbestos fibres can become airborne if disturbed, which is why the material is often wetted down before being removed. This helps prevent fibres from becoming airborne.
- Careful Removal: The asbestos sheets are carefully removed without breaking or damaging them. This ensures minimal exposure to fibres.
- Disposal: The asbestos materials are then sealed in heavy-duty plastic bags or containers and transported to an approved disposal facility. These facilities are specifically licensed to handle hazardous materials like asbestos.
3. Installing the Colorbond Roof
Once the asbestos roof has been removed and the site is cleaned and prepared, the installation of the new metal Colorbond roof can begin. The installation process involves:
- Roof Structure Inspection: Before the new Colorbond roof can be installed, the underlying roof structure (trusses, battens, and supports) should be inspected to ensure it is in good condition. If any parts are damaged or deteriorated, they may need to be repaired or replaced.
- Laying the Colorbond Sheets: Colorbond metal roofing sheets are then cut to size and fitted onto the structure. The roofing material is fixed to the battens with screws that have rubber washers to prevent leaks.
- Sealing and Flashing: Proper flashing and sealing are critical to prevent water penetration. Flashing is applied around roof penetrations such as chimneys, vents, and skylights to provide a watertight seal.
- Finishing Touches: The roof installation is completed with the installation of ridge caps, gutters, and downpipes. The new roof is inspected to ensure it meets the highest standards of quality and safety.
4. Site Clean-Up and Final Inspection
After the roof has been installed, the site will need to be thoroughly cleaned. This includes:
- Removal of Debris: All debris from the old roof and construction process is cleared from the property. Any small asbestos fragments are carefully collected and disposed of.
- Final Inspection: A final inspection by a building certifier or a professional roofer ensures that the new roof meets local building codes and that the work has been completed safely.
What Approvals Are Required for Replacing an Asbestos Roof?
In Queensland, several approvals are required for roof replacement projects, especially when asbestos is involved. The approvals can vary based on the scope of work, but they generally fall under the following categories:
1. Building Approval (Council Approval)
For most roof replacement projects, including asbestos roof removal, building approval from the local council is required. This is to ensure that the new roof meets structural, safety, and weatherproofing requirements as per the Queensland Building and Construction Commission (QBCC) guidelines and the National Construction Code (NCC).
- Development Application: If there are significant changes to the building (e.g., changing the roof structure or increasing roof height), a development application may be needed.
- Building Approval Certificate: For roof replacements like-for-like, a building certifier will assess the plans and issue a building approval certificate once the work complies with all relevant regulations.
2. Asbestos Removal Approval
The Safe Work Australia guidelines and local regulations require that any asbestos removal work be carried out by licensed professionals. Asbestos is classified as a hazardous material, and there are strict protocols in place for handling and disposal.
- Notification of Removal: In some instances, particularly for large-scale removal projects, the asbestos removalist must notify the relevant state authority (e.g., Queensland’s WorkSafe) before starting the removal process. This notification is required for projects involving the removal of more than 10 square metres of asbestos material.
3. Waste Disposal Approval
Once the asbestos has been removed, it must be taken to a licensed waste facility. In Queensland, there are specific facilities that are authorised to accept asbestos waste. This ensures that the material is disposed of safely and in accordance with the state’s regulations.
4. Environmental and Safety Regulations
Depending on the size of the project and the location, other permits may be required to ensure compliance with environmental and safety regulations. For example, if the work involves disturbing soil, there may be additional requirements to minimize contamination from asbestos dust.
How Much Does It Cost to Replace an Asbestos Roof with a Colorbond Roof?
The cost of replacing an asbestos roof with a new Colorbond roof can vary based on several factors, including the size of the roof, the complexity of the installation, and the condition of the underlying structure. Here are the main components that contribute to the cost:
1. Asbestos Removal Costs
The cost of asbestos removal is one of the largest components of the total cost. In Queensland, the cost of professional asbestos roof removal typically ranges from $50 to $100 per square metre, depending on the complexity and scope of the work. This price includes the safe removal, transportation, and disposal of the asbestos material at an approved facility. Larger roofs or properties with difficult access may incur higher removal costs.
2. Colorbond Roof Installation Costs
The cost of installing a Colorbond roof varies depending on factors such as the size of the roof, the type of Colorbond material chosen, and the complexity of the installation. On average, the cost for installing Colorbond roofing is approximately $80 to $120 per square metre, including the materials and labour costs. Additional costs may apply if the roof structure requires modifications or reinforcement.
3. Additional Costs
- Disposal Fees: If there is any extra waste or debris from the roof removal, there may be additional disposal fees.
- Repairs to Roof Structure: If the underlying roof structure is damaged or deteriorated, it may need to be repaired before the new roof can be installed. This can add an additional $1,000 to $3,000 to the cost, depending on the extent of the damage.
- Flashing and Gutter Replacement: Additional costs for flashing, gutters, and downpipes may apply, depending on the condition and requirements for the new roof system.
4. Total Estimated Cost
On average, the total cost to replace an asbestos roof with a new Colorbond roof in Queensland can range from $10,000 to $20,000, depending on the size of the roof and the specifics of the project. This cost typically includes asbestos removal, the installation of the new roof, and any additional work required.
Do You Have to Move Out During the Roof Replacement?
While the roof replacement is being carried out, you are not required to move out of the property in most cases. However, there are several important considerations:
- Asbestos Removal: During the removal of the asbestos roof, it is highly recommended that you vacate the premises for safety reasons. The removal process can release harmful asbestos fibres into the air, which poses serious health risks if inhaled.
- Timeframe: The time required for both asbestos removal and Colorbond roof installation can vary. For most standard roof replacements, the work may take 3 to 5 days. If the roof is particularly large or complex, it may take longer.
- Air Quality: If you’re sensitive to dust or fumes, it may be beneficial to leave the property during the roof installation, though the risk is much lower after asbestos removal is complete.
In summary, while you don’t have to move out permanently, taking precautionary measures and vacating during asbestos removal is highly recommended to ensure your health and safety.
Conclusion
Replacing an asbestos roof with a new Colorbond roof is a major undertaking that involves careful planning, safety measures, and professional expertise. The process includes assessing the condition of the existing roof, safely removing the asbestos, and installing the new Colorbond roof, all while ensuring compliance with various regulations and safety standards.
The costs associated with this project can vary depending on the size and scope of the work, but homeowners should expect to pay anywhere from $10,000 to $20,000 for the complete replacement, including asbestos removal, new roof installation, and any additional repairs. While you typically don’t need to move out permanently, vacating the property during the asbestos removal process is highly recommended to avoid exposure to harmful materials.
By engaging licensed professionals and following proper safety procedures, you can ensure that your roof replacement project is completed safely, efficiently, and to the highest standards.