Fiberglass Roof Cost Calculator

The cost of a fiberglass roof varies widely depending on factors like roof size, location, and labor costs. On average, fiberglass roofing can range from $8 to $12 per square foot, including materials and installation. This means a 1,500-square-foot roof could cost between $12,000 and $18,000. Complex roof designs or additional features may increase the cost.

Fiberglass Roof Cost Calculator

Roof Size (in square feet):
Roof Type: Flat Roof Pitched Roof
Roof Complexity (%):
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Estimated Cost: $0

Here is a table outlining the average cost of a fiberglass roof based on the size of the roof:

Roof Size (Square Feet)	Average Cost Range
1,000	$8,000 – $12,000
1,500	$12,000 – $18,000
2,000	$16,000 – $24,000
2,500	$20,000 – $30,000
3,000	$24,000 – $36,000

Please note that these are approximate cost ranges and can vary based on factors such as location, roof complexity, and specific materials used. It’s advisable to obtain quotes from local contractors for more accurate pricing.

FAQs

• Is it OK to walk on fibreglass roof? It is generally safe to walk on a fiberglass roof, but caution should be exercised to avoid damaging the surface. Use walk boards or crawl boards to distribute your weight and minimize the risk of causing cracks or damage.
• How many layers of fibreglass on a roof? Typically, a fiberglass roof consists of multiple layers of fiberglass mat or fabric impregnated with resin. Commonly, two or more layers are used for added strength and durability.
• How many years does a fibreglass roof last? A well-maintained fiberglass roof can last approximately 25 to 30 years or more.
• What are the disadvantages of fibreglass roofing? Disadvantages of fiberglass roofing may include potential cracking, susceptibility to moisture infiltration if not properly installed, and it can be more challenging to repair compared to some other roofing materials.
• Do fibreglass roofs leak? Fiberglass roofs can develop leaks if they are not installed correctly or if they are damaged. Proper installation and maintenance can help prevent leaks.
• Do fibreglass roofs need maintenance? Yes, fiberglass roofs require regular maintenance, including checking for cracks, repairing any damage promptly, and reapplying a protective coating as needed.
• Can you fibreglass over an existing fibreglass roof? It is possible to apply a new layer of fiberglass over an existing one, but it should be done carefully and may require surface preparation and the use of appropriate adhesives.
• How long to wait between layers of fibreglass? Typically, you should wait for each layer of fiberglass to partially cure before adding the next layer, which can take around 2 to 4 hours depending on environmental conditions.
• Do you need to sand fiberglass between layers? Yes, it is often recommended to sand the surface between layers of fiberglass to ensure proper adhesion and a smooth finish.
• Are fiberglass roofs noisy? Fiberglass roofs can be noisy during heavy rain or hail, as the material does not provide much sound insulation compared to other roofing materials.
• How do you maintain a fiberglass roof? Regular maintenance includes inspecting for damage, repairing any cracks or holes, and applying a protective coating or sealant as needed.
• What type of roof lasts the longest? Metal roofs, such as copper, zinc, and steel, are known for their longevity and can last 50 years or more with proper maintenance.
• What is the problem with fiberglass shingles? Fiberglass shingles can be more susceptible to damage from extreme weather conditions, and they may not offer the same aesthetic appeal as traditional asphalt shingles.
• What is better: rubber roof or fiberglass? The choice between a rubber (EPDM) roof and a fiberglass roof depends on factors like climate, budget, and specific roofing needs. Both have their advantages and disadvantages.
• Which is better: fiberglass or polycarbonate roofing? The choice between fiberglass and polycarbonate roofing depends on the intended use. Fiberglass is often used in traditional roofing, while polycarbonate is popular for transparent or translucent roofing applications like skylights or greenhouse panels.
• Is a fiberglass roof fireproof? Fiberglass itself is not completely fireproof, but it has fire-resistant properties. Fire ratings can vary depending on the specific fiberglass product and the additives used.
• Why choose a fiberglass roof? Fiberglass roofs are chosen for their durability, resistance to environmental factors, and longevity. They are also lightweight and can be cost-effective.
• What is the guarantee for a fiberglass roof? Guarantees for fiberglass roofs vary by manufacturer and installer but may range from 10 to 30 years or more.
• Can you pressure wash a fiberglass roof? Yes, you can pressure wash a fiberglass roof, but you should use low pressure and a wide fan spray to avoid damaging the surface.
• How do you fix a crack in a fiberglass roof? Repairing a crack in a fiberglass roof involves cleaning the area, applying a fiberglass patch or filler, and then sanding and painting to match the surrounding surface.
• Can you use bleach on a fiberglass roof? You can use a diluted bleach solution to clean a fiberglass roof, but be cautious not to use a concentration that may damage the material or nearby vegetation.
• Do you need an expansion joint in a fiberglass roof? Expansion joints may be needed in large fiberglass roof installations to accommodate thermal expansion and contraction.
• Is a fiberglass roof the best? Whether fiberglass is the best roofing material depends on your specific needs, budget, and preferences. It has its advantages but may not be suitable for all situations.
• Can you fiberglass over plywood? Yes, you can apply fiberglass over plywood, but proper surface preparation and adhesion are essential.
• How strong is one layer of fiberglass? The strength of one layer of fiberglass can vary depending on the thickness and type of fiberglass used, but it is generally quite strong and durable.
• How thick is a layer of fiberglass? The thickness of a fiberglass layer can vary, but for roofing applications, it is typically around 1/16 to 1/8 inch (1.5 to 3 mm).
• How can I speed up my fiberglass curing? To speed up fiberglass curing, you can use heat lamps or heaters to raise the temperature in the curing area, which can accelerate the curing process.
• How do you prepare old fiberglass for new fiberglass? Preparation may involve cleaning, sanding, and ensuring the old fiberglass surface is free of contaminants before applying new layers.
• What grit sandpaper for a fiberglass roof? Start with 80 to 100-grit sandpaper for rough surface preparation, and then use finer grits (e.g., 220) for a smoother finish.
• Does fiberglass insulation need an air gap? Fiberglass insulation typically does not require an air gap, but it should be installed snugly in cavities to provide effective thermal insulation.
• Why is my new fiberglass roof leaking? Leaks in a new fiberglass roof can occur due to improper installation, damaged materials, or insufficient sealing. Proper inspection and repair are necessary.
• Why does fiberglass go white? Fiberglass can turn white due to exposure to UV radiation, which causes a phenomenon called “chalking.” It’s a natural aging process for fiberglass.
• How heavy is a fiberglass roof? The weight of a fiberglass roof can vary significantly depending on its size and thickness. A rough estimate is around 1 to 2 pounds per square foot (5 to 10 kg per square meter) for standard roofing.
• How do I find a leak in my fiberglass roof? To find a leak in a fiberglass roof, inspect the surface for visible damage, and conduct a water test by spraying or pouring water onto suspected areas while checking for leaks inside.
• What kind of sealant to use on a fiberglass roof? Use a high-quality elastomeric or polyurethane sealant designed for roofing applications to seal joints, seams, and penetrations on a fiberglass roof.
• How do you stop condensation on a fiberglass roof? Condensation on a fiberglass roof can be reduced by improving ventilation and insulation in the attic or enclosed space below the roof.
• What is the cheapest longest-lasting roof? Asphalt shingles are often considered one of the cheapest and relatively long-lasting roofing materials, with a lifespan of 20 to 30 years.
• What is the most expensive roof to replace? The most expensive roofing material to replace is often slate or tile roofing due to their high material and labor costs.
• What is the easiest roof to replace? Asphalt shingle roofs are typically the easiest and quickest to replace due to their simplicity and ease of installation.
• Are fiberglass shingles worth it? Fiberglass shingles can be worth it due to their durability and fire resistance, but the decision depends on your budget and preferences.
• How long do 25-year fiberglass shingles last? 25-year fiberglass shingles can last beyond their rated lifespan if properly maintained, but they may start to show signs of wear and tear after 20 to 25 years.
• What is the average cost of fiberglass shingles? The average cost of fiberglass shingles can vary significantly depending on the quality and brand, but it’s typically between $80 to $120 per square (100 square feet).
• What is the best roof to put on a house? The best roof for a house depends on factors like climate, budget, and aesthetics. Common options include asphalt shingles, metal roofing, and clay or concrete tiles.
• What is the strongest roofing system? Metal roofing, especially standing seam metal roofing, is considered one of the strongest and most durable roofing systems.
• What are the disadvantages of fiberglass roofing? Disadvantages of fiberglass roofing may include potential cracking, susceptibility to moisture infiltration if not properly installed, and it can be more challenging to repair compared to some other roofing materials.
• What is the most cost-effective roof material? Asphalt shingles are often considered one of the most cost-effective roofing materials due to their affordability and relatively long lifespan.
• Do fiberglass roofs crack? Fiberglass roofs can develop cracks over time, especially if they are exposed to significant temperature fluctuations or if they are not properly installed or maintained.
• How long does a fiberglass roof take to cure? The curing time for fiberglass can vary depending on temperature and humidity, but it typically takes several hours to a day for each layer to cure fully.
• What temperature can you do a fiberglass roof? Fiberglass work is best done at temperatures between 60°F (15°C) and 90°F (32°C) for optimal curing and adhesion.
• What is the best color for a fiberglass roof? The choice of color for a fiberglass roof is a matter of personal preference and climate considerations. Light-colored roofs reflect more sunlight and heat, while darker colors may absorb more heat.
• Why do fiberglass roofs make noise? Fiberglass roofs can transmit noise more effectively than some other roofing materials, which can result in more noise during rainfall or other external disturbances.
• How do you maintain a fiberglass roof? Regular maintenance includes inspecting for damage, repairing any cracks or holes, and applying a protective coating or sealant as needed.
• Can a fiberglass roof be repaired? Yes, fiberglass roofs can be repaired by patching or filling any cracks or holes, and by reapplying a protective coating as needed.
• Is a fiberglass roof waterproof? A properly installed and maintained fiberglass roof can be waterproof, but it is important to address any cracks, damage, or improper installation that may compromise its waterproofing.
• What is the longest roof warranty? The longest roof warranties can be up to 50 years, typically offered for high-quality metal or some premium roofing materials.
• Is a fiberglass roof flammable? Fiberglass itself is not highly flammable, but the resin used in fiberglass products may burn when exposed to flames. Fiberglass can be treated to be fire-resistant.
• Can you fiberglass over an asphalt roof? It is possible to apply fiberglass over an existing asphalt roof, but it requires proper preparation and adhesion to ensure durability.
• Can you fiberglass over a concrete roof? Fiberglass can be applied over a concrete roof, but it requires careful surface preparation and the use of appropriate adhesives.
• Can you put new fiberglass over an old fiberglass roof? Yes, you can apply new fiberglass layers over an existing fiberglass roof, but proper surface preparation and adhesion are essential.
• Will fiberglass crack spread? If not repaired promptly, cracks in fiberglass can potentially spread over time, especially if subjected to temperature fluctuations or stress.
• Can you pressure wash a fiberglass roof? Yes, you can pressure wash a fiberglass roof, but use low pressure and a wide fan spray to avoid damaging the surface.
• Can you power wash a fiberglass roof? You can power wash a fiberglass roof with caution, using a low-pressure setting and being mindful not to damage the surface.
• What is the minimum slope for a fiberglass roof? The minimum slope for a fiberglass roof depends on the specific product and installation guidelines, but it is typically recommended to have at least a 1/4 inch (6 mm) per foot slope for proper water drainage.
• How many layers of fiberglass do I need for a flat roof? For a flat roof, it is common to apply multiple layers of fiberglass to ensure strength and durability. Typically, two or more layers are used.
• What are the pros and cons of fiberglass? Pros of fiberglass include strength, durability, and resistance to environmental factors. Cons can include potential cracking, susceptibility to moisture infiltration, and challenges with repairs.
• What is the most durable residential roof material? Metal roofing, such as steel or copper, is often considered the most durable residential roof material due to its longevity and resistance to weathering.
• Does fiberglass last longer than wood? Yes, fiberglass is generally more durable and longer-lasting than wood when used as a roofing or building material.
• What material does fiberglass resin not stick to? Fiberglass resin may have difficulty adhering to certain materials like Teflon or some types of plastics.
• How long to wait between layers of fiberglass? Typically, you should wait for each layer of fiberglass to partially cure before adding the next layer, which can take around 2 to 4 hours depending on environmental conditions.
• How many layers of fiberglass do I need for 1/4 inch thickness? The number of layers required for a specific thickness of fiberglass can vary depending on the type of fiberglass and the resin used. It may take several layers to achieve a 1/4 inch thickness.