Roofing Options for Flat & Low Slope Sheds

When choosing a roofing material for your flat roof shed, there are several options to consider, each with its own set of advantages and disadvantages. This guide covers various materials including Asphalt Roll Roofing, EPDM Rubber Roof, Metal Roof, and PVC Roof Panels.

All prices mentioned are as of 2024 and are intended for guidance only. The final cost will depend on the actual materials used and the specific requirements of your project. The products listed are not specific recommendations but represent commonly used items in the market. We are not endorsing any particular product.
These roofing options are relevant for our modern shed line, but they are also suitable for gabled roof sheds.

Asphalt Roll Roofing

Example System: GAF Liberty Self-Adhering 2-Ply Roofing System

• Primer: Asphalt primer (or ASTM D41 equivalent) at ½ gallon per 100 sq ft.
• Flashing or Drip Edge: Use flashing cement or roof cement.
• Wind Resistance: Up to 150 mph.
• Lifespan: Up to 20 years.
• Color Options: White, black, shakewood, slate, hickory, tan, weathered wood.

Average Cost

Advantages

• Cost-effective.
• Easy to install.
• Long-lasting protection with proper installation.
• Variety of colors available.

Disadvantages

• Not suitable for very low slopes without a 2-ply system.
• Requires proper priming and sealing.
• Might not be aesthetically pleasing for some applications.

Example System: MFM Peel & Seal Self Stick Roll Roofing

“MFM Peel & Seal Self Stick Roll Roofing” is ideal for hot climates due to its reflective surface, which limits solar heating. It is easy to apply and comes with a 10-year warranty, making it a durable choice for various surfaces.

• Ideal for Hot Climates: Reflective surface to limit solar heating.
• Warranty: 10 years.
• Surface Preparation: Use an asphalt-based primer for wooden surfaces (weathered plywood or wood, OSB, composition board, and masonry).
• Primer for New Plywood/Wood: Not required.
• Flashing or Drip Edge: Use flashing cement or roof cement.

Average Cost

Advantages

• Reflective surface reduces solar heating.
• Easy to apply.
• Suitable for various surfaces.
• Good warranty period.

Disadvantages

• Higher cost compared to asphalt roll roofing.
• Requires clean and dry surface for application.
• Limited color options.

EPDM Rubber Roof

Average Cost

Advantages

• Temperature tolerance -60°F to 300°F.
• High wind resistance.
• Excellent in various weather conditions.
• Not easily damaged by UV rays.

Disadvantages

• Black EPDM absorbs heat; white EPDM is available but costlier.
• Can puncture easily.

Installation Notes

• Special adhesive needed for bonding with wood.
• Use elastomeric roof coating & sealant to change color and add strength.

Metal Shed Roofing

Exposed Fastener Metal Roofing

• Underlayment: felt, self-adhering membrane, or synthetic sheet.
• Flashing or Drip Edge: Optional.
• Wind Resistance: Good but decreases with time.
• Lifespan: 20 - 60 years, with regular fastener resealing or replacement.
• Color Options: Clear metal, white, various shades of gray, green, red, etc.

Average Cost

Advantages

• Cost-effective.
• Easy to install.
• Readily available.
• Variety of colors available.

Disadvantages

• Minimum slope 1:12.
• Longevity issues (gaskets last ~15 years).
• Not an ultimate choice for Moderna or Solana sheds – unless gaskets are monitored and replaced as they age.

Hidden Fastener (Standing Seam - Snap Lock) Metal Roofing

This type of roofing is difficult to work with and requires working with a porfessional installer. This is not a DIY-friendly option. Most companies work on the big projects and to place a custom order for a shed roof might be difficult or expensive, and is best combined with a larger project.

• Underlayment: felt, self-adhering membrane, or synthetic sheet.
• Flashing or Drip Edge: Optional.
• Wind Resistance: Excellent
• Lifespan: 80 years, likely will outlive your shed.
• Color Options: Clear metal, white, various shades of gray, green, red, etc.

Average Cost

Advantages

• Minimum slope ½ :12.
• Can last up to 80 years.
• Better expansion and contraction handling.
• Aesthetically pleasing.

Disadvantages

• More difficult to install.
• Requires special order or experienced crew.

Overall Advantages of Metal Roof

• Long lifespan, especially for standing seam.
• Strong wind and weather resistance.
• Aesthetically pleasing with hidden fasteners.
• Variety of colors and finishes available.

Overall Disadvantages of Metal Roof

• Higher initial cost, especially for standing seam.
• More complex installation process.
• Exposed fasteners have shorter lifespan and higher maintenance.

PVC Roof Panels

Average Cost

Advantages

• Transparent, allowing natural light.
• Strong and durable.
• UV protection.

Disadvantages

• Potential for color fading.
• Expansion and contraction may cause leaks, seals have to be monitored.
• Not fire-resistant.

Installation Notes

• For extra light, omit several roof boards (but no wider than a PVC roof panel) during the installation to create a skylight effect and use clear PVC roof panels.

Summary

Each roofing option for flat roof sheds has its unique advantages and disadvantages. Consider factors such as cost, climate, aesthetic preferences, and installation complexity when choosing the best roofing material for your project.