What is Overcladding?

Overcladding is the process of adding a new layer of cladding over an existing roof, effectively giving the property a “second skin” with durable metal sheeting. This method utilizes a space bar system to support the new panels, allowing for enhanced structural integrity. Project managers often seize this opportunity to install additional insulation between the new and old cladding, significantly boosting the thermal performance of the building. You can even use the existing roof as a liner for our twin skin system.

What is Twin Skin Metal Roofing?

The twin skin roofing system (or otherwise known as the built up system) consists of several integral components that work together to create a robust and energy-efficient structure. Key features include:

White Liner Inner Sheet: This reflective surface enhances insulation performance and helps maintain a comfortable indoor environment.

-Bar & Bracket or Mini Z Purlin: This component ensures structural integrity and supports the weight of the roofing panels, distributing loads evenly.

Insulation Layer: Providing thermal resistance, this layer reduces heat transfer, helping to keep energy costs low.

Box Profile 0.7mm Outer Sheet: The durable outer layer is designed to withstand harsh weather conditions, ensuring long-lasting protection.

Benefits of Overcladding

1. Minimized Disruption
One of the key advantages of overcladding is that it minimizes disruption to both buildings and occupants. For businesses operating in commercial spaces, time is money. Unlike more invasive renovations that may require vacating the premises, overcladding allows work to proceed while occupants remain on-site. This means less downtime and greater productivity.

2. Enhanced Appearance
Overcladding can transform older buildings, giving them a fresh, modern look. This aesthetic upgrade is especially beneficial for both residential and commercial properties, allowing them to blend seamlessly with surrounding architecture. The durable nature of metal cladding ensures that this appealing appearance is maintained for years.

3. Reduced Maintenance Costs
When considering property modifications, maintenance is crucial. Overcladding significantly reduces risks associated with condensation, thermal bridging, and corrosion. This means lower maintenance costs and less frequent repairs, making it a wise investment for property owners.

4. Increased Lifespan
With its resistance to weather damage and low maintenance requirements, overcladding extends the lifespan of your roof. Property owners can enjoy peace of mind knowing that their investment will last without the need for constant repairs or replacements.

5. Improved Energy Efficiency
One of the standout benefits of overcladding is its ability to enhance thermal performance and energy efficiency. The added layer of protection improves insulation, helping to maintain a comfortable indoor temperature year-round. This not only contributes to a greener environment but can also lead to significant savings on energy bills over time.

Benefits of Twin Skin / Built Up System

1. Cost-Effective
By combining various elements into one comprehensive system, our twin skin roofing solution reduces overall installation and material costs and is a great alternative to composite panels where budget may be an issue.

2. Energy Efficient
The insulation and reflective properties help lower heating and cooling costs, making it a smart investment for any property.

3. Durable and Weather Resistant
With a robust outer layer, our twin skin roofing is designed to endure the elements, ensuring your investment stands the test of time.

4. Easy Installation:
The streamlined installation process saves time and labor costs, allowing for quicker project completion.

Installation Process

Installing a twin skin or overcald roofing system is straightforward when you follow these essential steps:

1. Secure the Sheets
Begin by securing the twin skin liner sheets to the roof, positioning them close to the rafter line to ensure stability. If overcladding, this step can be skipped.

2. Distribute Weight Evenly
Carefully spread the sheets out across the purlins. This step is crucial for balancing the weight and maintaining the structural integrity of the roofing system. If overcladding, this step can be skipped.

3. Fix the Bars & Brackets or Mini Z Purlins:
Attach the brackets or mini Z purlins through the lining sheet into the existing purlins (if using & bracket system then attach bars to brackets). If overcladding, secure the purlins directly to the existing roof instead of using liner sheets.

4. Lay Insulation
Before applying the top sheet, lay down the insulation. We offer rolls of 100mm rock wool insulation, which provides excellent thermal resistance and enhances the overall energy efficiency of your roofing system.

5. Apply the Top Sheet
Position the top sheet and fix it to the mini Z purlin or Bar. Ensure all connections are tight and secure to prevent any potential leaks.

6. Apply Flashings
Finally, attach any flashings such as Ridge or Barge to the sheets to provide additional weather protection and avoid leaking. Foam Fillers can also be inserted along with the ridge to further protect any insulation from the elements.