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How To Install Corrugated Metal Roof Over Shingles
October 1, 2020

Ok, so you need a new roof. You may be tired of using shingles and want something else. Something more durable and aesthetically-pleasing than your traditional shingles. Metal roofing materials are always the best option.

But here’s the thing, you need a more efficient and effective way to install the new metal roof that will save you time, without incurring extra expenses. You must have asked yourself a dozen times, “can I still install my metal roof over this old shingles”? The answer to this question and many more “how’s” is what we’re about to unravel.

So, Can Metal Roofs Be Installed Over Old Shingles?

Let’s say your old roof material is asphalt shingle, but you so desire to get a new metal roof, given the numerous benefits it poses. Do you have to tear off that old shingles entirely? Absolutely No! Metal roofing can do just fine when installed over old shingles. You don’t have to remove the entire shingles. You can install that new corrugated metal sheets over your old shingles, provided that your local roofing codes allow it.

Installing a metal roof over your old shingles presents the opportunity of avoiding any shingle tear-off expenses, including disposal fees. Besides, metal roofing materials weigh much less than the shingles, making it easier for you to install then over shingles. You also get to experience all the benefits of a metal roof.

Why Should I Install A Metal Roof?

Although shingles and most other types of roofing materials maybe a little less expensive, they require more maintenance, and there’s always a need to repair or replace some portion. It’s also quite unfortunate that shingles cannot be recycled. Most shingles usually end up in landfills and waste disposal companies that charge nearly exorbitant fees before accepting them.

But with metal roofing, you need not worry about its disposal as it is 100% recyclable. You will indeed have to pay more to get these materials than with shingles. It, however, pays off in the long run. Metal roofing comes with lesser maintenance and repair needs, and it can last for up to 50 years.

Metal roofing adds more appeal to the entire structure, thanks to its numerous styles and colors. Aside from its aesthetic appeal and longevity, corrugated metal roofs are highly energy-efficient. Most metal roofing sheets are treated with a special paint that helps it reflect a huge amount of UV rays, helping to maintain a reasonable temperature within your home during hot days and saving good bucks on utility bills.

Getting Started

It’s indeed a great thing not to worry about dismantling the old roof because you will have to save more time and effort. Moreover, you will also get the benefit of having stronger support in your roof structure. Here’s how to install your metal roof over shingles.

But then, first thing first.

Before we get to the details, lets first explore a simple rule that anyone that wants to install a metal roof must stick to. If you’re not confident enough to handle the job or you can’t walk on the roof, call a seasoned roofer.

Now that the rule is done with if you still want to go ahead and install your metal roof, here’s how to go about it.

Tools You Will Need

  • Metal sheets
  • Ladder
  • Metal trim and edging
  • Hammer
  • Snips for cutting metal
  • Measuring tape
  • One ¼ inch roofing nails
  • 3-inch long head screws

Step By Step Guide

Ensure That Your Shingle Is In The Right Shape

Before you run off with the idea of installing a new metal roof, there are some things you need to consider. You have to ensure that everything is straight and square, or you may fail while attempting to install the metal shingles. You must be aware of any mechanical issues that need to be resolved and fix them squarely.

You must ensure that the plywood of the existing shingle roof is good. A weak wood won’t hold the roof screws, making it easier to the wind.

You also have to address any existing roof leaks. Control any moisture and ensure that the roof is well ventilated. Moreover, replacing rotten rafters or sheeting is essential here. After you have made sure that everything is square, you move on to the next step.

Measure Your Roof

With the help of the measuring tape, calculate the total sum area of your roof. Roof calculation and estimation involve getting the accurate measurement of your roof’s length and width. An accurate calculation will always give you a great estimate.

Once you’re done measuring, take your estimate to your local metal roof supplier or manufacturer and get the needed amount of corrugated metal roof sheets. Also, ask them about warranties and safety issues.

Create A Slat Board Base

Before installing your new metal sheets, you have to create a slat board base. This serves as a support to the metal roof on top of the shingles. Attach them with a 3-inch wood screw.

Install The Metal Edging

The next step is to install your metal edging around the perimeter of your roof. Use a one ¼ roofing nails to attach your metal edging.

Install Your Metal Sheets

Attach your metal sheets to the framing. One after the other, starting with one side and from the top, install the sheets and attack the screws two feet away from each other. Make sure that each sheet overlaps the first one. Make sure that the sheets cover the whole roof area.

Attach The Flashing

After covering the whole roof surface with metal sheets secured with screws, attach a metal trim along the top ridge and edges. This is called flashing, which helps to make the roof leak proof.

Although it is fine that you know how to install metal roofing over asphalt shingles, metal roofing always requires more specialized skill sets, making a job best reserved for professionals.

However, if you live in New York and have a new building that is in the stage of roofing or you are interested in switching from your current non-metal roof to metal roofing, then trust us to do a perfect job. Contact us now at 118-35 Queens Blvd Forest Hills, NY 11375 (718) 414-6067 https://www.nycrenovators.com  for a free estimate.

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