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Can Metal Roofing Be Installed Over Plywood

can metal roofing be installed over plywood

Metal roofing is one of the most highly durable and versatile types of roofing materials available.

However, many homeowners wonder if they can install metal over plywood. The short answer is yes! But there are a few things to consider before you make your decision.

How can you install metal roofing over plywood?

The first step is to ensure that your plywood installation meets building codes.

Most localities require a minimum of 15/32 inch thickness and at least an A-D rating for durability according to the National Roof Deck Association (NRCA).

Another consideration when planning this type of project is to account for any potential leaks.

To avoid this, do not screw the plywood to the framework of your home’s roofing system; instead use galvanized screws (or ones with rubber washers) and seal all exposed seams using a waterproof adhesive like silicone.

If you are installing this type of roofing over an existing one, be sure to completely remove the existing roofing material before you begin.

This is because any exposed nails or seams will likely compromise your new installation and result in leaks even if they are waterproofed.

How much does it cost?

Many homeowners opt for this type of metal roofing due to its durability, low maintenance needs, weather-resistance, and long lifespan.

Many metal roofs are designed to last anywhere from 50-100 years, so choosing the right roofing material for your home is important.

The cost of installing a new metal roof system over plywood will depend on several factors including: size and type of metal chosen, number of layers required (if any), length of run, pitch of the roof, and whether it is a DIY project or you hire out installation.

What benefits are there in doing so?

Installing metal roofing over plywood would be the best option if budget is not an issue.

While installing with nails may potentially damage your plywood covering, adhesives are costlier and will lose its bond after years.

So if you want long term benefits, it’s better to fit metal roofing over plywood.

roof sheeting

What are the materials needed for installation?

For installing metal roofing over plywood, you will require following materials:

  • Plywood sheet
  • Roofing nails
  • Roofing shingles
  • Metal drip edge
  • Metal flashing
  • Underlayment

Are there special tools required?

No, not really. You can use common tools to install metal roofing over plywood. For example:

  • Cold chisel
  • Hammer
  • Drill
  • Screwdriver
  • Tape measure
  • Seam roller
  • Water level
  • Cable cutter

What are the steps involved?

The following steps can be followed to install metal roofing over plywood: 

1. Measure out your coverage area, as you would need more than usual underlayment.

2. Make sure you have enough nails. It might be a good idea to invest in a roofing stapler instead of a hammer if your plywood is old and breakable.

3. Start laying underlayment over plywood, overlapping the edges by 6 inches. Either use adhesive or staples followed by a hammer to lay down the underlayment.

4. Take a metal drip edge and secure it over the plywood. Overlap drip edges by 2 inches and secure with nails followed by a hammer.

5. Lay roofing shingles starting from the lower left corner, until you get to the upper right corner of your roof. Repeat this process in the opposite direction.

6. It’s time to secure roofing nails over the plywood joints. Make sure you place enough nails before proceeding to the next step.

7. To finally secure metal roofing over plywood, take metal flashing and overlap it on top of the shingle by about 5 inches and rip it using a knife.

8. For the final step, snap the metal roofing into place on top of plywood. It’s better to use a rubber mallet for this purpose.


In conclusion, installing metal roofing over plywood is a viable option.

If your plywood is not in good shape and it’s corroding or rotting then you can replace that to ensure that you get best results from your metal roofing installation.

And if you want to keep the cost as low as possible, metal roofing over plywood is the best choice.

A new layer of shingles would make the past look beautiful and will protect your home from heat and other harsh weather conditions.

You can also use a ridge vent to increase airflow within the structure.

multilevel metal roof over blue sky