How to Install a Fibreglass Roof? | Astral Roofing and Building Ltd

A fibreglass roof installation requires a stable, dry foundation, typically achieved via timber decking. This foundation is essential for ensuring the roof’s durability.

Before installation, it is necessary to conduct pre-installation checks to identify any underlying issues. Insulation is also crucial for thermal comfort. The installation process involves using materials such as polyester resin and glass fibre matting.

Post-installation, routine inspections and reapplication of topcoat are necessary to maintain the roof’s durability. We’ll cover the tools, procedures, and information needed to install fibreglass roofing in this tutorial. You’ll learn enough about fibreglass roofing that will help you to decide on what’s needed for your building project with ease.

What Tools Are Required for Fibreglass Roof Installation?

Here is a list of what you will need for fibreglass roof installation:

A high-quality roller (specifically, paddle and finned rollers) for applying resin and eliminating air pockets in the fibreglass matting.
Scissors or a utility knife for cutting the fibreglass matting to the desired size.
A calibrated mixing bucket for maintaining the correct resin-to-catalyst ratio.
A mixing paddle is attached to a power drill for thorough blending of the components.
Disposable brushes and rollers for applying resin and topcoat evenly across the surface.
Safety gear:
– Gloves
– Safety goggles
– Respirator mask
A heat gun or hairdryer (optional) to assist in the curing process, particularly in cooler weather conditions.
Edge trims and flashing tools:
– Tape measure
– Hammer
– Nails
A sanding machine or sandpaper for smoothing out any rough edges after the fibreglass has cured.
A quality tarp or protective covering to shield the work area from adverse weather conditions.

How Is a Fibreglass Roof Installed?

A fibreglass roof is installed through a multi-step process. To install a fibreglass roof, follow these steps:

Prepare the roof deck: Ensure it is constructed of 18mm OSB3 or 8×2 tongue-and-groove OSB boards, laid perpendicular to the roof joists. Verify the existing roof structure is free from dampness or rot. Leave an expansion gap around the edges to prevent future damage.
Lay the fibreglass laminate: Cut the fibreglass matting to size. Apply a coat of resin to the deck, then lay the matting onto the resin-coated surface with a 50mm overlap at the edges. Apply additional resin over the matting using a roller to remove air pockets, maintaining a 3:1 resin-to-catalyst ratio.
Sand and topcoat: After the laminate cures (typically within 30 minutes), sand down excess material at corners and edges for a smooth surface. Within 24 hours, apply the topcoat mixed with 2% catalyst at a coverage rate of 0.6kg/m² to ensure fire resistance and durability.
Consolidate the laminate: Verify the laminate is well-consolidated to create a robust, waterproof roof. For larger or intricate installations, consider consulting a professional to guarantee high quality and longevity.

How Long Does Fibreglass Roof Installation Take?

The duration of fibreglass roof installation varies, but for a typical 20 square meter domestic roof, the entire process takes 1 to 2 working days. Larger or more complex projects require additional time to ensure quality and adherence to best practices.

When Is the Best Time to Install a Fibreglass Roof?

The best time to install a fibreglass roof is during warmer weather, typically late spring to early autumn when temperatures are more stable and conducive to the curing process.

In this period, temperatures allow the resin to set at an optimum rate, reducing the likelihood of curing too quickly or too slowly, resulting in a more durable and reliable roof. Installation during colder weather, particularly below 5°C, is not recommended as the resin will struggle to cure properly, compromising the roof’s integrity.

A team of two experienced contractors can complete a 20-square-meter roof in 1-2 working days in optimal weather. However, adverse weather conditions can extend this timeline. Consulting a professional for timing and planning is advisable to achieve the best results.

What Should I Consider Before Installing a Fibreglass Roof?

Before installing a fibreglass roof, consider the following critical factors:

Weather conditions: Install fibreglass roofing in dry, moderate weather. Avoid rain, excessive humidity, and extreme temperatures (above 35°C).
Roof deck preparation: Ensure the substrate consists of 18mm OSB3 or 8×2 tongue-and-groove OSB boards, laid perpendicular to the roof joists. Verify the existing roof structure is free from dampness or rot, and leave an expansion gap around the edges.
Insulation compliance: Check if the existing roof insulation meets current building regulations. Upgrade insulation if necessary, ensuring it complies with required thermal performance standards.
Resin mixing and application: Mix small batches of resin to allow adequate application time before catalyzation. Apply the laminate in short runs to minimize premature hardening.

How Can I Find a Reliable Contractor for Fibreglass Roof Installation?

Ask friends, neighbours, or local construction professionals for referrals to trusted contractors. Check online reviews on Google, Facebook, and the Better Business Bureau to assess the contractor’s reputation.

Look for contractors specializing in fibreglass roofing with several years of experience. Verify their licenses and liability insurance by requesting copies of their certificates.

Obtain quotes from at least three contractors, being cautious of notably lower bids. Inquire about warranties on workmanship and materials, including their length and terms.

Check references from past clients and follow up to verify their satisfaction. Ask to see photos of previous fibreglass roofing projects to assess the contractor’s expertise.

Frequently Asked Questions

How Many Layers of Fibreglass Roofing Are Needed?

For most residential roofing projects, a single layer of fibreglass is generally sufficient. This typically includes a fibreglass mat saturated with resin, forming a durable, waterproof surface.

For commercial or industrial applications, multiple layers may be recommended to handle heavier loads or severe weather. Each additional layer increases the roof’s thickness and durability, extending its lifespan.

What Is the Life Expectancy of a Fibreglass Roof?

Fibreglass roofs can last up to 30 years or more, with some cases extending to 50 years. This longevity makes them a popular choice for homeowners and commercial property owners. Their durability and resistance to water ingress and weather-related deterioration contribute to their extended lifespan.

How Long Does It Take to Fit a Fibreglass Roof?

Fitting a fibreglass roof typically takes about one day for an average domestic garage roof of approximately 20 square meters. A team of two experienced roofers can remove the existing roof, re-deck the area, apply the fibreglass laminate, and complete the topcoat within this timeframe.

Is Fiberglass Roof Worth It?

Yes, a fibreglass roof is worth it. Given its durability, longevity, and high performance, fibreglass roofing offers a robust and reliable solution for homeowners. It excels in resisting environmental conditions, including extreme weather and temperature changes. Unlike asphalt shingles, which degrade, fibreglass materials withstand wear, ensuring a lifespan of up to 30 years or more, with some lasting up to 50 years.

How Do You Fix a Leaking Fiberglass Roof?

To fix a leaking fibreglass roof, first, identify the damaged section and cut it out, including the underlying sheet material. Reconstruct the base using firings and new boarding to match the roof’s level. Apply new fibreglass matting and resin meticulously to restore the water-resistant barrier.