Making the switch to a metal roof from asphalt shingles is an exciting time because the appearance of your home changes so much. However, you might be wondering what to expect when it comes to metal roofing installation. Your roofer will explain the process to you, but here are some points you may want to know or ask your roofer about.

Leaving The Shingles In Place

Metal roofing is light, so it can be put over an old asphalt shingle roof. However, talk to your roofer about the pros and cons of this. If you tear off the old roof, the roofer can see the condition of the deck much better to make sure there is no water damage.

Since a metal roof can last for decades, you want to ensure the deck is in excellent shape so the roof doesn't fail early. Plus, the roofer needs to make sure the current deck is sufficient for metal roofing since the plywood has to be thick enough to hold on to metal roofing screws.

Getting Custom Roof Panels

Metal roofing panels come in standard widths and lengths. The lengths can be cut to the length of your roof, but if your roof is longer than the maximum standard size, you may have the option of ordering custom panels that are longer. The advantage is that you'll eliminate seams along the length of your roof that have the potential for leaking and that affect the appearance of your roof. The disadvantage is that your roof will cost more.

Installing The Panels On Plywood

Metal roofing installation can be done in different ways. If you already have an asphalt shingle roof, you probably have a plywood deck. Using the same deck for your metal roof cuts down on costs. The roofer just needs to put underlayment over the deck first. This involves rolling out the self-adhesive water barrier and sticking it to the plywood. Then the metal panels can be screwed on top of it.

Sealing Seams Along The Width

Since the width of metal panels is standardized to one size, the panels need to be joined together across your roof. This creates several seams that need to be sealed so rain doesn't get under the panels. The seams are dealt with differently according to the type of panels.

The panels are usually screwed into the roof deck using screws and rubber washers. Then the next panel overlaps. Standing seam panels have fasteners hidden under the seam. Other panels may have exposed fasteners. Have your roofer explain the metal roofing installation process so you understand the leak risk around seams, how to monitor for leaks, and how to make repairs if leaks develop.

For more information on metal roofing installation, contact a company like Amcon Roofing.