Tiffany Haney
Metal roofs are a popular roofing option due to their durability, modern look, and low maintenance. They are also energy efficient, reflecting sunlight to keep buildings cool and reduce energy costs. When installing a metal roof, it is important to ensure that you have the necessary skills and experience, or else consult a professional. The process involves measuring the roof area, clearing the surface, and installing panels and trim. There are several types of metal roofing materials to choose from, including steel, aluminum, copper, and zinc, each with its own advantages and disadvantages. Safety should always be a top priority when working on a roof.
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What You'll Learn
Prepare the roof surface
Before installing a metal pan roof, there are several important steps to properly prepare the roof surface. First, ensure that you have the necessary safety equipment, including gloves, eye protection, and a respirator, as well as a helper to assist with the installation process. Next, carefully inspect the roof deck for any signs of damage or rot and replace any damaged or rotten sections with new plywood. It is crucial to establish a solid and sturdy base for the metal roof to rest on.
After addressing any issues with the roof deck, the next step is to lay down an underlayment, which serves as a secondary layer of protection between the metal roof and the deck. There are various types of underlayments available, including synthetic and felt underlayments. Carefully roll out the chosen underlayment and secure it to the roof deck, ensuring that it is properly aligned and fastened according to the manufacturer's instructions. This step provides an added barrier against moisture and helps to extend the lifespan of the roof.
With the underlayment in place, it's now important to plan the layout of the metal panels. Start by snapping a chalk line down the centre of the roof, perpendicular to the ridge, to establish a reference point. This line will guide the placement of the metal panels, ensuring they are installed straight and aligned correctly. It is crucial to take the time to carefully plan the layout to avoid any issues during installation and ensure a neat and precise finish.
Once the centre line has been established, the next step is to install the eave flashing. This component helps to direct water away from the roof and protects the underlying structure. Secure the eave flashing to the roof deck, ensuring it is properly sealed and fastened according to the manufacturer's instructions. The eave flashing provides an essential layer of protection against water damage and helps to maintain the longevity of the roof.
With the eave flashing in place, you can now begin to install the metal panels, following the established layout. Start at the centre of the roof and work outwards, fastening the panels securely to the roof deck. Ensure that you follow the manufacturer's instructions for proper panel spacing and fastening techniques. It is important to work systematically and maintain consistent spacing between the panels for a uniform and aesthetically pleasing finish.
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Measure the roof
Before installing a metal pan roof, it is important to measure the roof accurately to ensure you have the correct number of panels. Start by measuring the area you plan to cover. Go up onto the roof and measure every eave, gable, ridge, valley, and sidewall to get exact measurements to the inch.
After obtaining these measurements, add two inches to each panel for the drip edge, which protrudes by one inch and bends back by one inch. If you plan to use 16-inch-wide panels, calculate the number of panels required for each side by multiplying the width of your home in feet by 12 and then dividing that number by 16. It is generally recommended to order panels that are at least one inch longer than your measurements and to have at least one extra panel in case of errors or damage.
Additionally, when installing metal roofing panels, it is crucial to ensure that the first panel is square to the eave, creating a straight reference line for all subsequent panels. This can be achieved by using the 3-4-5 method, which involves making marks along the eave and ridge and snapping a line to create a square reference.
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Choose the right materials
When choosing materials for a metal pan roof, there are several factors to consider, including cost, longevity, climate, and aesthetics.
For a durable, lightweight, and stylish roofing solution, aluminium pan roof panels are a great option. Aluminium is rustproof, resistant to corrosion, and can last 30 to 50 years. It is an excellent choice for coastal areas or environments with acid rain. However, it is more expensive than steel and may not be suitable for climates with hail due to its tendency to dent easily.
Steel is the most economical option for metal roofing. It is strong, crush-resistant, and can last 30 to 50 years when properly installed. Steel is available in various colours and finishes, making it easy to match your home's aesthetic. However, bare steel is prone to rust, so it is often coated with zinc or aluminium to improve its durability.
If longevity is a key concern, copper is the most expensive and durable option, lasting up to 200 years. Copper develops a natural patina over time and is aesthetically appealing.
For those seeking a more cost-effective option, contractors and homeowners often choose to install a Steel Standing Seam, made of Galvalume or G-90 galvanized steel. However, steel can rust and corrode, especially if its coating wears off.
In addition to choosing the right type of metal, there are other materials to consider when installing a metal pan roof. These include basic carpentry tools such as a drill, shovel, garden hoe, and a level. You will also need butyl tape, sealant or sealant tape, screws, and roofing nails.
To ensure you have the correct amount of materials, accurate measurements are essential. Measure the area you plan to cover, including the eave, gable, ridge, valley, and sidewall. Add two inches to each panel for the drip edge, and consider ordering your panels slightly longer than your measurements, with an extra panel in case of any mistakes.
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Install eave trim
Eave trim, also known as a drip edge, is the first piece of trim to be installed on a metal roof. It is crucial for preventing water damage and giving the exterior of your home a polished look. Here is a step-by-step guide on how to install eave trim:
Prepare the Trim
Before installing the eave trim, you need to prepare it by cutting and bending it to fit your roof. Make a series of one-inch cuts with aviation snips at each bend to create tabs. Fold these tabs in with a hand seamer to meet a wall or a corner, or to close any gaps created by the trim. Remember, each trim is a different shape, so the cuts and bends will be unique to each piece.
Install the Trim
When installing the eave trim, ensure that it is tight to the fascia and fastened securely to the roof deck over the underlayment with one-inch roofing nails. Apply butyl tape to the underside of the trim where it meets the flat part of the roof panels. Press it in place and drive screws every 12 inches directly over the butyl tape.
Overlapping Trim Pieces
If your roof is larger than 12 feet, you will need to overlap the eave flashing. To do this, notch the eave trim by removing three inches of the drip edge hem, allowing it to slide into the next piece of eave trim with a three-inch overlap. Apply caulking where the eave flashing will overlap and use a screwdriver to slightly open the hem of the adjacent piece of drip edge. Carefully slide the second piece of eave trim into the first piece, being careful not to smear the caulking.
Secure with Screws
Use a 1” metal-to-wood pancake head screw to fasten the top of the eave trim to the metal roof. Place the screw in the centre of the eave trim, ensuring it is located eight inches from each end of the eave flashing. Maintain a twelve-inch spacing between screws in the centre of the eave flashing.
Seal the Trim
Finally, use a caulking gun to seal any gaps between the eave trim pieces and the roofing panels, ensuring a weatherproof seal for added protection.
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Assemble the frame
When installing a metal pan roof, it is important to have the right tools and materials, as well as experience and skills. If you are inexperienced, it is recommended to contact a professional handyman or contractor.
To assemble the frame for a metal pan roof, follow these steps:
First, measure the area you plan to cover. Accurate measurements are crucial to ensure you have the right number of panels. Measure every eave, gable, ridge, valley, and sidewall. Add two inches to each panel for the drip edge, which sticks out by one inch and is bent back by one inch. Order your panels at least one inch longer than your measurements, and consider getting at least one extra panel in case of errors.
Next, clear the roof surface of any debris or old roofing material. A clean surface ensures better adhesion and longevity for the panels. A thorough cleaning can prevent problems like trapped moisture, which can lead to mould or mildew.
Then, prepare the roof deck. The first layer on top of the plywood or OSB roof deck is the underlayment. A self-healing ice-and-water membrane can be used to protect the shallow-pitched roof deck.
After the underlayment is installed, you can install the eave trim. Cut and bend the leading end to wrap it around the corner. Make a series of one-inch cuts with aviation snips at each bend to create tabs. Fold the tabs in with a hand seamer to meet the wall or corner. Fasten the eave trim to the roof deck over the underlayment with one-inch roofing nails.
Now, you are ready to install the metal roofing panels. Place each metal panel on an inside foam closure strip. Position the closure strips along the eave about one inch from the edge and secure them to the panels with butyl tape. Run a bead of sealant on top of the closure strip, then set your panel so it overhangs the eave by one to two inches.
Finally, install exposed fasteners along the centre of the pan, threading the sealant tape beneath to create a watertight seal. Attach fasteners—one on each side and one in the middle. Be careful not to over-tighten the fasteners, as this can cause issues with the neoprene washer. Continue attaching and installing panels until the roof is covered.
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Frequently asked questions
Metal pan roofs are durable, weather-resistant, and low-maintenance. They are also energy efficient, reflecting sunlight to keep your home cooler and reduce energy costs. Metal roofs are also sleek and modern in appearance, with no visible seams.
You will need basic carpentry tools such as a drill, shovel, garden hoe, and a level. You will also need safety equipment, including a full-body harness, a roof anchor, a lifeline, and a shock-absorbing lanyard. For the roof itself, you will need metal panels, sealant tape, screws, and a ridge cap.
Start by measuring the area you plan to cover to ensure you have the correct number of panels. Then, clear the roof surface of any debris or old roofing material to ensure better adhesion and longevity for the panels.
First, establish a square reference line 90 degrees to the eave to ensure the panels are installed evenly. Place each metal panel on an inside foam closure strip, which will keep bugs and water from getting underneath. Apply sealant tape along the eave, then install the panels, screwing them into the fastening strip.
Steel is the most economical option for metal roofing, but it is prone to rust. Aluminum is lightweight, rustproof, and highly resistant to corrosion, making it ideal for coastal climates. Copper is the most durable and expensive option, lasting up to 200 years and developing a natural patina over time.
