A Step-by-Step Guide to Installing Metal Roofing Over Plywood

Are you considering installing a metal roof over plywood? Metal roofing is a durable and long-lasting option that can provide excellent protection for your home.

Whether you’re replacing an old roof or building a new structure, this guide will walk you through the process of installing metal roofing over plywood. So, let’s get started!

Step 1: Prepare the Plywood

The first step in installing metal roofing over plywood is to ensure that the plywood is in good condition and properly prepared. Start by inspecting the plywood for any signs of damage, such as rot, warping, or loose nails.

If you find any issues, make the necessary repairs or replace the damaged sections before proceeding.

Next, clean the surface of the plywood to remove any dirt, debris, or loose particles. This can be done by using a broom or a leaf blower to sweep away any loose material.

You can also use a pressure washer to thoroughly clean the surface, but be careful not to apply too much pressure as it can damage the plywood.

Once the plywood is clean, allow it to dry completely before moving on to the next step. This is important because any moisture trapped between the plywood and the metal roofing can cause corrosion and other damage over time.

Step 2: Install the Underlayment

Before installing the metal roofing, it’s recommended to install an underlayment to provide an extra layer of protection against water infiltration.

There are several types of underlayment available, including felt paper and synthetic materials like synthetic underlayment or ice and water shields. Consult with a roofing professional to determine the best underlayment for your specific project.

To install the underlayment, start at one corner of the plywood and roll out the material, ensuring that it overlaps the edge by a few inches. Secure the underlayment to the plywood using roofing nails or staples, making sure to follow the manufacturer’s instructions for spacing and placement.

Continue rolling out the underlayment, overlapping each row by a few inches, until the entire surface of the plywood is covered. Trim any excess underlayment using a utility knife or scissors.

Step 3: Measure and Cut the Metal Roofing

Now that the plywood and underlayment are prepared, it’s time to measure and cut the metal roofing panels. Start by measuring the length and width of the roof to determine the size of the panels needed. It’s important to account for any overhangs or edges that may require additional material.

Using a chalk line or a straight edge, mark the measurements on the metal roofing panels. Then, using a metal cutting tool or a circular saw with a metal-cutting blade, carefully cut the panels to the desired size. Be sure to wear appropriate safety gear, such as gloves and goggles, when cutting the metal roofing.

Once the panels are cut, check the fit by placing them on the roof and making any necessary adjustments. It’s important to ensure that the panels are properly aligned and that there are no gaps or overlaps between them.

Step 4: Install the Metal Roofing

With the panels cut and adjusted, it’s time to install the metal roofing. Start at one corner of the roof and place the first panel, ensuring that it is properly aligned with the edge and any overhangs. Secure the panel to the plywood using roofing screws or nails, following the manufacturer’s instructions for spacing and placement.

Continue installing the remaining panels, overlapping each one by a few inches to ensure a watertight seal. Use a roofing screw or nail at each overlapping point to secure the panels in place. Be sure to check the alignment and fit of each panel as you go along, making any necessary adjustments.

Once all the panels are installed, check for any loose screws or nails and tighten them as needed. Inspect the entire roof to ensure that the metal roofing is securely fastened and that there are no gaps or leaks.

Step 5: Finish the Installation

After the metal roofing is installed, there are a few final steps to complete the installation. Start by installing the ridge cap, which is a specially designed metal piece that covers the ridge of the roof and provides additional protection against water infiltration. Secure the ridge cap to the roof using roofing screws or nails, following the manufacturer’s instructions.

Next, install any necessary flashing around chimneys, vents, or other protrusions on the roof. Flashing is used to create a watertight seal and prevent water from entering the roof at these vulnerable areas. Again, follow the manufacturer’s instructions for installing the flashing correctly.

Finally, clean up the work area by removing any debris or leftover materials. Dispose of them properly according to local regulations.

Congratulations! You have successfully installed metal roofing over plywood. With proper maintenance and care, your new metal roof will provide years of reliable protection for your home.

Remember, if you’re not comfortable or experienced with roofing installations, it’s always best to consult with a professional roofing contractor. They have the knowledge, skills, and equipment to ensure a safe and proper installation.