How to Install Metal Roofing on a Flat Roof

Metal roofing is one of the most popular materials for commercial and several residential buildings with flat roofs, thanks to its numerous advantages. Known for its durability and resistance to harsh weather conditions, metal roofing is ideal for property owners in Phoenix, Arizona, to protect their investments.

If you plan on installing this material on a flat roof, there are standard steps to guarantee a successful and effective installation. This installation guide will outline the proper steps to install metal roofing on a flat roof the right way, providing a robust and reliable roofing system for your building.

Why Residential and Commercial Buildings Use Metal Roofing

In today’s construction landscape, the choice of roofing material plays a part in the building’s longevity, safety, and efficiency. Thanks to its many benefits, metal roofing has become an increasingly popular option for residential and commercial buildings with flat roofs. Below are reasons why it stands out as a preferred solution for many applications:

• Durability and Longevity. Metal roofs are highly durable and can last 40 to 70 years with proper maintenance. They hold out against extreme weather conditions, including strong winds, heavy rain, and snow, making them an excellent long-term investment for commercial and residential properties.
• Low Maintenance. Metal roofs require minimal maintenance than other roofing materials. Their resistance to cracking, shrinking, and corrosion minimizes repair frequency, lowering maintenance costs over time.
• Energy Efficiency. Metal roofs can be coated with reflective materials to reduce heat absorption, keep building interiors cooler, and reduce cooling costs. This energy efficiency is particularly beneficial for large buildings in Phoenix.
• Fire Resistance. Metal roofs are non-combustible, providing a high degree of fire resistance. This is an important safety feature for property owners who want to lower insurance costs and improve overall safety.
• Environmental Sustainability. Often made from recyclable materials, metal roofing is an environmentally friendly option. The metal can be recycled at the end of its life cycle, reducing the environmental impact.
• Lightweight Material. Despite their strength and durability, metal roofs are relatively lightweight. This places less stress on the building structure and can simplify engineering requirements and support structures.
• Ease of Installation. Metal roofing systems can be installed relatively quickly, minimizing downtime for businesses and homeowners. This can be advantageous during new construction or roof replacement projects, keeping projects on schedule.
• Aesthetic Versatility. Metal roofs come in different styles, colors, and finishes, enabling property owners to achieve the desired visual appeal and branding. This aesthetic versatility is ideal for creating a modern and attractive appearance.
• Pest Resistance. Metal roofing can deter pests such as rodents and insects, which can cause damage to other roofing materials. This helps maintain the roof’s integrity and reduces the risk of infestations.

How to Install Corrugated Metal Roofing on a Flat Roof

Corrugated metal roofing panels are characterized by their wavy, ribbed pattern, which enhances their strength and durability. If you prefer corrugated metal roofing on your building’s flat roof, you can follow these standard steps for a successful installation job:

1. Planning and Measuring

Begin by measuring the dimensions of your flat roof to determine the amount of corrugated metal sheet needed. Accurate measurements are needed for the correct quantity and size of materials, including corrugated sheets, flashing, fasteners, and additional components like sealants. You should also check local building codes and regulations to comply with any specific requirements for metal roofing installations.

2. Preparation

Before installation, prepare the roof surface by removing debris, wet insulation, old roofing material, or obstructions. Make sure the roof deck is smooth and structurally sound. Adding a vapor barrier or underlayment is advised to protect against moisture and improve the roof’s thermal performance. Underlayment provides extra protection and can help with insulation, contributing to the roof’s durability and energy efficiency.

3. Set Up a Slight Pitch

Even though flat roofs look level, they require a minimum slope to facilitate proper drainage. Install sleepers or furring strips to create a slight roof slope or pitch, typically around 1/4 inch per foot. This will help prevent rainwater runoff and pooling, which is important to stop water damage over time. Securely attach these supports to the roof deck to create a stable base for the metal sheets.

4. Installing the Edge Flashing

Begin by installing edge flashing around the perimeter of the low-slope roof. Flashing is essential for waterproofing and protecting the roof’s edges where the metal meets adjoining surfaces, like walls or parapets. Use roofing screws or nails to secure the flashing, aligning and overlapping it properly. This creates a continuous barrier that prevents water infiltration and increases the roof’s resistance to wind and weather.

5. Laying the Corrugated Metal Sheets

Start placing the metal sheets at one end of the roof, lining them up with the drip edge and flashing. Overlap each sheet as the manufacturer recommends, typically one or two corrugations. Secure the sheets to the roof deck using appropriate screws with rubber washers for a watertight seal. Place the fasteners at the peaks of the corrugations to minimize water penetration and distribute the load evenly.

6. Sealing the Joints and Seams

As you install each row of corrugated sheets, apply sealant or tape to the overlaps and seams for a tight seal. This protects against leaks and enhances the roof’s weather resistance. Focus on areas around fasteners and overlaps, as these points are most susceptible to water infiltration. Regularly check for alignment and consistency to maintain the appearance and functionality.

7. Installing Ridge Caps and Additional Flashing

After covering the entire roof surface with corrugated sheets, install ridge caps and additional flashing at roof junctions and terminations. These elements seal the roof’s edges and transitions, providing a finished look while protecting against weather exposure. Use sealant and fasteners to secure these components, overlapping the metal sheets properly for maximum protection.

8. Final Inspection and Clean-Up

Once the installation is complete, do a thorough inspection to ensure that all components are securely fastened and sealed. Look for exposed fasteners, loose sheets, or vulnerable areas needing attention. Clear any debris from the installation process and free the gutters and drainage systems from obstructions. Regular maintenance and inspections will further prolong the life of your corrugated metal roof.

Different Types of Metal Roofing And Their Installation Steps On Flat Roofs

If you want to expand your options for metal roof installation, you can find other variants compatible with flat roofing. You should also be aware that each type has a different installation process you must follow to guarantee it looks and functions properly on your flat roof. You can find below the different metal roofing types and a brief explanation of their installation processes:

Standing Seam Metal Roofing

This type features vertical metal roofing panels with raised seams, or “standing seams,” that interlock and are fastened above the roof deck. It’s highly durable and weather-tight, ideal for flat roofs that experience heavy rain or snow. The concealed fasteners of seam metal roofs provide a sleek appearance and reduce the risk of leaks.

Installation Process

• Preparation. Measure the roof area and install a suitable underlayment over the roof deck.
• Panel Layout. Determine panel layout, accounting for seam alignment and desired overlap.
• Install Cleats/Hooks. Install metal cleats or clips along the roof deck at specified intervals to hold panels.
• Place First Panel. Align the first panel at the roof’s edge, securing it to the cleats.
• Interlock Panels. Attach subsequent panels by interlocking the raised seams.
• Secure Seams. Use a seaming tool or hand screw to secure the seams for weather-tightness.
• Finish With Ridge Caps. Install ridge caps and other trim pieces to seal edges and transitions.

Metal Shingles

Metal shingles can replicate traditional roofing materials used on homes, such as slate or wood, while offering the durability and longevity of metal. They are smaller than panels and can be installed in overlapping rows, providing a unique aesthetic that can add character to a home or office building’s flat roof.

Installation Process

• Preparation. Apply an underlayment over a clean roof deck and mark guidelines for shingle placement.
• Begin Installation. Start from the bottom edge of the roof.
• Install Shingles. Place shingles in the first row, overlapping and securing with nails or screws.
• Continue Rows. Use staggered seams for additional rows, ensuring interlock and proper overlap.
• Secure Edges. Install flashing along roof edges, including ridge caps, if applicable.

Metal Tiles

Like metal shingles, metal tiles can replicate the look of ceramic or stone tiles. They are lightweight, resistant to cracking, and resist harsh weather conditions. Metal tiles can offer a distinctive style for flat roofs while ensuring long-lasting protection.

Installation Process

• Preparation. Install an appropriate underlayment over a cleared roof deck.
• Layout Plan. Plan the layout for aesthetics, aligning tiles with edge guides.
• Place First Row. Begin at the roof edge, aligning and securing tiles in place.
• Interlock Rows. Install tiles in consecutive rows, interlocking edges as per design.
• Secure With Clips. Attach tiles with tile clips or fasteners.
• Finish Edges. Add edge flashing or trim for a finished look.

Flat Lock Metal Panels

This system consists of flat metal roofing panels that interlock with each other, creating a seamless and uniform surface. The panels are fixed with concealed fasteners, giving it a clean look free of visible screws or joints. Flat lock metal panels are suitable for flat roofs with a very slight pitch and are known for their aesthetic appeal and high-quality performance.

Installation Process

• Preparation. Install a water-resistant underlayment on the roof deck.
• Panel Planning. Outline panel arrangement, ensuring alignment.
• Secure First Panel. Position the first panel at the starting point, usually a corner, and secure it with concealed fasteners.
• Interlock Panels. Lay the next panel, interlocking it with the previous one, and secure it.
• Tighten the Seams. Make sure seams are tight and secure using an appropriate sealing method.
• Apply Edging. Finish with edge flashing and trim for complete coverage.

Ribbed Metal Panels

These metal roof panels have raised ribs, similar to corrugated metal but with a broader, flatter profile. They offer good durability and are more commonly used in commercial applications than in residential ones due to their industrial appearance and easy maintenance. Appropriate slope and sealing are needed to prevent water accumulation.

Installation Process

• Preparation. Clear the roof deck and install an underlayment.
• Install Edge Flashing. Secure edge flashing around the perimeter.
• Place First Panel. Start at one edge, placing the first ribbed panel with ribs oriented as planned.
• Align and Secure Panels. Carefully align each panel and secure it with screws in pre-drilled holes, typically along the flat sections adjacent to the ribs.
• Overlap Panels. Ensure panels overlap according to manufacturer guidelines, often covering one rib to protect against moisture ingress.
• Finish With Roof Trim. Install ridge caps or edge trim for improved aesthetics and functional integrity, sealing all edges and transitions.

Proper Maintenance Tips for Metal Roofing On Flat Roofs

If you want your metal roofing panels to last long, you need to maintain them regularly. Whether doing it yourself or hiring roofing contractors in Phoenix, Arizona, roofing maintenance is more cost-effective than repairs. Here are several maintenance tips commonly used by experts:

• Regular Inspections. Conduct routine inspections at least twice yearly and after severe weather conditions to find signs of damage or wear. Look for rust, loose fasteners, damaged panels, and debris accumulation. Early detection of problems can prevent small issues from becoming costly repairs.
• Keep the Roof Clean. Regularly remove leaves, branches, dirt, and other debris from the roof surface and gutters. Accumulated debris can trap moisture against the roof, corroding and blocking drainage systems that can cause water pooling and leaks.
• Check and Clear Drainage Systems. Ensure that gutters, downspouts, and roof drains are clear of blockages for proper water flow. Poor drainage leads to water pooling, which may cause leaks or structural damage over time.
• Address Rust and Corrosion Immediately. Clean and treat the affected area immediately if any rust or corrosion is found during inspections. Use a rust converter or protective paint for metal roofs to prevent further deterioration and maintain the roof’s integrity.
• Tighten Loose Fasteners. Check for any loose or missing screws, nails, or fasteners. Tighten or replace them as needed to ensure the metal panels remain secure. Loose fasteners can shift or move panels, leading to potential leaks and structural issues.
• Seal and Repair Leaks. Inspect the roof for signs of water intrusion, such as stains or damp spots inside the building. Use appropriate sealant or patching material to address leaks quickly, focusing on seams, overlaps, and around penetrations like vents or skylights.
• Trim Overhanging Branches. Regularly trim back any tree branches that hang over the roof. Overhanging branches can scrape the metal surface, cause damage during storms, and accumulate debris on the roof.
• Maintain Surface Coatings. If your metal roof has a protective coating, make sure it remains intact. Reapply the coating when needed to provide additional protection against environmental elements and UV radiation to help extend the roof’s lifespan.
• Hire Professional Maintenance. Consider scheduling professional maintenance services in Phoenix every few years. Roofing professionals can perform more thorough inspections and maintenance tasks that may be challenging for property owners, guaranteeing the roof remains in optimal condition.

Hire Stonecreek Roofing for Effective Metal Roofing Installations in Phoenix, Arizona

When you consider Stonecreek Roofing to install your metal roofs, expect quality results. We’re adept at working on various types, specifically R-Panel and standing seam metal roofing materials. Our extensive roofing knowledge lets us conduct roofing tasks with ease. We should also mention our warranties to give you peace of mind even if you encounter roofing issues after we have completed the job.

Call our company today if your building’s metal roofing needs expert servicing.learn more about our roofing company and the various services we provide.