Now, when it comes to metal roofs, some of the common questions people ask revolve around noise and heat. But, other than that, most people are surprised to ask other questions such as can you put a metal roof over an existing metal roof?

You see, historically, repairing a roof involved removing the existing roof and replacing it with a new one.  But, with the advancement in technology, contractors nowadays don’t need to entirely remove an existing metal roof. Instead, what they do is leave the old metal roof in place and cover it with new metal panels. So, in this short post, we’re going to discuss the benefits of installing a metal roof over an existing metal roof, possible drawbacks, and factors to consider when installing a new metal roof.

Why is it Feasible to Install a Metal Roof Over an Existing Metal Roof?

Now, some people prefer to remove the old metal roof before installing the new one. However, with advancements in technology, it’s possible to install a new metal roof over an existing metal roof without having any issues.

But, before you commence, there’s some work to be done. You need to perform a close visual inspection of the existing roof to ensure there are no damages. You need to inspect the roof framing, the decking, the planes of the roof, and the overall roof structure to ensure there are no signs of damage.

In case you climb up the roof and you notice signs of weak, rotten, or composed parts, then it means the integrity of the existing metal roof is questionable. For that reason, it’s best if you replace the roof. Otherwise, if everything appears fine, then you can proceed to add a new metal roof over the existing roof. So, what are some of the benefits of taking this route?

• Faster Installation

The first benefit of installing a metal roof over an existing roof is that it saves time. How does it save time? You see, with this approach, you don’t have to remove the existing roof. Therefore, the cost and the time it takes to remove the existing roof are cut leaving you with the task of installing the new roof. This allows you to accomplish the job faster.

• A Lower Cost

Less time taken to install a metal roof means that more money is saved in the process. If you follow the longer route of removing the existing metal roof to install a new one, you’ll have to pay more for labor and you’ll have to pay a fee for disposing of the metal sheets to a recycling plant. Remember, the sheets will have to be transported for disposal.

• No Disruption

If you choose to remove your existing roof, you’ll have to move temporarily to pave the way for the job to be accomplished. Remember, this job cannot be accomplished overnight. Therefore, your contractor will have to cover the roof with a temporary cover, which can expose you to the elements. But, if you choose to install the roof over your existing roof, you won’t have to move out entirely.

• Extra Protection

Although your existing metal roof might be showing some signs of wear, it doesn’t mean that it’s totally ruined. So, by adding a new metal roof over the existing roof, you actually create an extra layer of security which is vital.

Any Drawbacks

• Improper Visual Inspection

Before doing a retrofit project, a licensed structural engineer should do due diligence by inspecting the existing roof carefully. He/she should climb over the roof to look closely at the integrity of the roof before they can proceed to lay another metal roof on top.

Failure to inspect the roof at different angles means that any slight mistake can lead to a serious problem that can cost you a lot in the future.

• Increased Depth

If you install a new metal roof over an existing metal roof, you actually raise the depth of the overall roof. While this might not be an issue, the main problem is that some of the roofing accessories might be affected in the process. Here, we’re talking about the HVAC equipment on the roof, skylights, and any other adjoining details.

• Need For Longer Nails and Screws

Lastly, an increase in the depth of the overall roofing system means that you’ll require longer nails and screws to fasten the new roof to the existing rafters. Most people overlook this factor and thus end up with shorter nails and screws that fail to penetrate through both roofs (new and existing roofs).

So, Are There Any Mistakes to Avoid When Installing a New Metal Roof Over an Existing Metal Roof?

Installing a new metal roof over an existing metal roof is not just a walk in the park. There are those factors you must be aware of to avoid any problems. So, what are some of these common mistakes you should be aware of?

• Use the Right Fasteners

The first mistake you should avoid when installing a metal roof over another metal roof is using the wrong fasteners. You see, here, you’ll be dealing with a roof that has an increased depth. So, you need to have longer screws that will reach the existing rafters. Secondly, make sure the fasteners have washers to avoid water from penetrating the inside.

• Do Proper Calculation

Another mistake most people do when installing new metal roofs over existing roofs is failing to do the right calculations. Although this route is cheaper and time effective, you need to have a proper calculation of the number of materials you’ll require. To avoid messing up, you can use a free online calculator.

• Consult Your Insurance Company

The last mistake most people do when installing metal roofs over existing metal roofs is failure to consult their insurance companies. You see, each insurance company has its own terms in its policy. For instance, some insurance companies don’t cover metal roofs that are installed on top of old metal roofs. So, before you commence, it’s wise to first understand the terms and the rules of your insurance company.

Conclusion

So, can you put a metal roof over an existing metal roof? Well, the answer is yes. You see, with this approach, you end up saving the overall project cost, and best of all, the construction time is sliced significantly. Besides, the new metal roof adds an extra layer of protection meaning your roof will last longer.