Best Underlayment for Metal Roof: The Ultimate Guide

What metal roof makes a difference, especially when your roof has this sealing, but your neighbor doesn’t have so?

Well, when a heavy-storm comes, the non-metal roof then it appears to be falling apart. During heavy snowfall, the roof will tuck with 3 feet of snow, but you would never face it. By the way, metal roofing is somewhat more expensive, but it lasts for a lifetime.

As it is a lifetime investment and only the right deal will keep your roof in great condition, then let’s introduce you to the best underlayment for a metal roof.

  1. DuPont Roof Protector Underlayment Roll
  2. MFM Peel & Seal Self Stick Roll Roofing
  3. Grace Tri-Flex XT
  4. Tyvek Protec 120 Roof Underlayment

Best Underlayment For Metal Roof

1. DuPont Roof Protector Underlayment Roll – Best Tar Paper for both commercial and residential uses

Dupont is the right bait for those who want to see the maximum water intrusion and never leave 0 square, thus ensuring amazing coverage. As a result, you will have fewer overlaps, easy to install, and thus. Eliminate the hassle of labor.

The key reason to choose it is the versatility to adjust on any underlayment for low slope metal roofing. Because they churn out the tar paper under a 2:12 ratio that fits the maximum commercial and residential roofs. Moreover, it is easily set on under metal cladding, and asphalt shingles roofs.

We found the protector effective on wooden boards or any plywood apart from metal roof underlayment. That being said, it offers more than regular. One important tip for you is to apply more rolls; once you sort out a leak, the chalk liner will help you a lot.

???? Pros:
  • Installation is easy and quick
  • Keep the sheeting dry during rain
  • Chalk liner guides through edges to edges
  • Resist slipping or dripping
  • All-weather effectiveness
???? Cons:
  • Cannot resist ice-damping effects

Summary: Tearing or falling apart from your roofing layer across the fastener points is a major concern. Dupont engineered this synthetic underlayment for metal roof provides excellent grip with slip-resistant features. Installation is easy and ideal for a 2:12 roofing surface. Overall, we believe this is the best Sheathing for metal roofing.

2. MFM Peel & Seal Self Stick Roll Roofing – Best Peel & Stick for any roof, RVs, and trailer homes

MFM Peel & Seal is specially designed to curb appeal and protection for RVs and trailer homes. Because it has amazing adhesiveness to stick to them and offer impervious texture next to the high winds for your mobile homes.

The key to this roofing is its aluminum composite foil, where the manufacturer infused the polymers and rubberized asphalt. That brings highly adhesive and flexible texture resulting in self-adherence. Over time, it stays good and won’t let the moisture or heat get along.

Another reason why we recommend you for its amazing fitting to any low pitch roofs. For that, it will be adequate enough to come in and fit. Moreover, the overall thickness is good enough to give extra tension and coverage. If the roofing has many fastener points, then it will ensure worry-free coverage as well.

???? Pros:
  • Designed for Low-Sloped roof
  • Withstand maximum heat
  • Avoid dust and weather effects
  • Ensure self-adhering
???? Cons:
  • It adheres fast but not slip-resistant

Summary: The RVs and trailer homes are often made of Plywood, composition board, OSB, or masonry. Once you have prepped the roof, then the peel and seal would be amazing. Moreover, MFM has just nailed it to have a peel and stick underlayment for the metal roof.

3. Grace Tri-Flex XT – Best Synthetic with maximum durability

If your roof is as slippery as snot, then get your hands on Grace Tri-Flex XT because it is coated on both sides by slip-resistant polymer so that you will get amazing foot traction. Moreover, it ensures insane weather-resistance during bad hail storms.

This synthetic underlayment is durable, lightweight, and thick enough then regular felt underlayment. Therefore, you can install it easily no matter what roof type you have. GCP self-adhered underlayments come from the resin-technology. Here is why the coating easily soaks up and finds its true base or roof.

Having intense sealing under synthetic construction will be a blessing for you. Water and mold won’t penetrate and cause any harm with moisture and mold growth.

???? Pros:
  • Prohibit leaks and avoid water penetration.
  • Create extra foot traction.
  • Reduce bad impacts from harsh weather.
  • Lasts longer than regular underlayment.
???? Cons:
  • Didn’t find any mentionable con

Summary: Grace Tri-Flex brought the ultimate slip-resistant and UV protective underlayment. It costs more, but if you intend to have such features, then this will provide the maximum ROI as well.

4. Tyvek Protec 120 Roof Underlayment – Affordable underlayment from a reputed company

unique embossed pattern, ideal for slopes 2:12 or higher, four-layer construction, water barrier layer, moisture barrier, withstand UV exposure for up to 3 months

A clean or new roof is easy for metal roofing. We recommend you not to invest more in buying a tar paper with boastful features. Dupont Tyvek is the best underlayment for a metal roof with a clean deck. You will get to see amazing results under minimum bucks.

The best thing about this underlayment is its price. Under a constraint budget, you can invest in it to cost 25% less than others. Dupont churns it out with an embossed pattern so that it will give you better footing or traction. You can roll up pretty well since it is lightweight, and the 2:12 ratio of its size allows you to have the maximum coverage.

After the experiment, we see this underlayment seems a good bait to those living nearby coastal areas. The heavy-rainfall or hail storm nothing comes to penetrate the texture at all. Thanks to the fibrous construction it has, and the windy weather also falls flat under it.

Tyvek is far more compatible with any roof surface; you can easily get to see it crumble up the cling nearby the roof deck. The whole process comes up so easily, so no worry about installation. The four layers of construction never buckle up, however during windy environments, make sure you will find a mate for the work.

???? Pros:
  • Affordable under great features
  • Easy to install
  • Ensure good traction
  • Great value for money
???? Cons:
  • Not considerable for ice-damping

Summary: If you consider the above features under price point, we believe Dupond has made it the best underlayment for a metal roof. It is easy to install even though you won’t follow up on the manual.

How To Choose Underlayment For Metal Roof?

Underlayment for the metal roof has many baits; you may not figure them all out. Based on your roof type and the benefits you are expecting, you can choose one from another. So, let’s figure out the following buying guide for it.

What Is The Underlayment For Metal Roofing?

The roof is something that withstands the worst all-weathering effects; we all agree with it. The underlayer metal roof saves it from water seepage, deters from rust or fungus build-up, and always keeps it in good condition.

Needless to prove that the concealed layer reduces and traps the moisture and eventually protects from breaking apart when a tiny leakage breaks out. It is all-inclusive protection that every homeowner might have expected to see; the everlasting roofing. The price is high but saves more bucks of yours for a lifetime, indeed!

What Types Of Underlayment For Metal Roofing?

Synthetic underlayment is highly adjustable to many roofing types, and thus it is preferable over many metal roofing systems. It has a solid texture and holds up the metal’s pretty well. As a result, it extends more compared to others.

Since it is developed under thermoplastic polymers, it lasts longer and resists better against moving or tearing. The temperature tolerance is also rewarding with a due hike of vaporization during the winter and summer season. In the rainy season, it creates a muscle-like barrier and never allows water to seep in.

Asphalt Felt Or Roofing Tar Paper:

Asphalt is the least expensive choice while you are going to think about metal roofing. The good side is it is affordable and great for water penetration. On the other hand, the bad side is it is hard to buckle up as it comes with roofing square rolls.

Synthetic Sheet Underlayment:

Synthetic underlayments is a newer version and have innovated recently. It is highly endurable to the all-weather aftermaths. Its charm is to have high-performing polymers, making it a protective layer between the roof deck and itself.

Self-Adhering Membrane Underlayment:

The self-adhering membrane is peel like stick product, a sticky substance that adheres closely to the roof deck. This special membrane is effective greatly for ice dam protection. For that, it safeguards the roof caves, valleys, dormers, and recline to rising walls. If you are living in harsh cold weather, then this kind of underlayment fits great.

Choose the right membrane of underlayment:

Not all underlayment comes to fall under the same criterion that solves many. First off, you need to categorize the item as good for summer or extreme icing. Besides, the rest of the others are good bait for wind and turn out as water shields.

Normally, maximum underlayment is a good bait for rubberized-asphalt or butyl types of sticky substance because it has an amazing texture for footing and adhesive enough.

On the other hand, if your roof is exposed to scorching weather, opt for the high-temperature underlayment for the metal roof.

Some metal roof underlayment insulation is really praiseworthy as the vapor faster than any other kind. Here is why the membrane turns out great for moisture soaking; therefore, many of us love to have such a membrane type. The secret of it is to have resin-based polymer, making it an amazing deal for you.

Layers of Construction:

One simple hack is the more layer, the better result you will have. Here is why Synthetic underlayment is the best bait.

That being said, if your underlayment comes with 4 layers, then make sure it would be enough lightweight to put things together while roofing. Last but not least, the one layer under another layer is another concern. For example, you must have all the necessary features alongside the layers.

Easy Installation:

We know installation costs add up when we can’t put things together yourself. Calling a DIYer is not welcoming. Thankfully, some of the great underlayments come right out of the box, easy to install without buckling up.

Extended Service Life:

Metal roofing commonly survives or sustains way much more than its competitors. However, from one to another, it differs to some extent. Here is why you come to know what you are opting for. The more the roof survives under harsh weather for years, the more it will be expensive. Meanwhile, don’t forget to know, the roofing type will match with the underlayment unless you go nuts.

How Do You Install Underlayment On A Metal Roof?

Metal roof underlayment installation would be easy when you come to know a few hacks to do so. Let’s tell you how to install the underlayment.

Step: 1

An underlayment seems to be a vapor barrier, so to have its fullest output make sure you have sorted out all defective leaks. Moreover, you will need to clean the deck before installation as well.

Step: 2

The first thing that comes up is to install the drip edge. To do so, you have to lie horizontally. Use the cap nail to assess the edge to edge measurement.

Step: 3

Once you laid it, the time comes up for overlapping; we recommend you apply minimum overlapping. The higher course overlap would be 6″ and the lower lap overlap would be 20″.

Step: 4

Things would be getting easier if you overcharged the bottom drip edge. To do so, place several cap nails ranging from 4″-5″ from the top edge.

Step: 5

Finally, place another layer and then go for the final one and meanwhile, fold 2 layers under 2″ at the upper side across the lower.

Frequently Asked Questions (FAQs)

Do you need a vapor barrier under a metal roof?

A vapor barrier is typically made with plastic or foil sheet to resist the diffusion of moistures. If you want to prevent the moist air flow up through the insulation, you should place it under the metal roof.

Do I need tar paper under a metal roof?

Tar paper is a building construction material that provides heavy-duty performance in making the roof waterproof. If your metal roof is already constructed with high-grade asphalt shingles, then you don’t need to use another because asphalt itself works as a good underlayment.

Do you need an ice and water shield under metal roofing?

“Ice & water shield” acts as a good barrier to make the roof waterproof. It also protects the vulnerable areas of the top from getting damaged by the ice & water. If you find out that your roof is prone to ice & water intrusion, you need to bring a premium quality & high-temperature ice & water shield.

Do I need underlayment for a metal roof?

First off, you need to check whether your house is built with joists or asphalt shingles materials. In the case of joists, you need underlayment for your metal roof.

Do you put plywood under a metal roof?

Usually, you don’t need to use plywood sheeting under the metal roof until these certain conditions arise. Like, the durability of a metal roof is around 30 years. If you don’t use plywood, then after this period, you have to bear the expense of re-insulating the entire top.

Is it recommended to insulate under a metal roof?

Insulation works to retain heat in a home during the winter season. A metal roof is a better heat conductor than a wooden roof, so it is recommended to insulate under a metal roof.

Can you put a metal roof on a low slope?

For the hydrostatic that means water barrier-like characteristics, a metal roof is considered good for a low slope roof.

How do I know when to replace the underlayment?

If you suspect any damage by seeing your floor structure, you should find out the reason. Then if you think the damage cannot be repaired without replacing, you should replace the underlayment.


When bad weather is buzzing, it is high time to bring the Best underlayment for a metal roof. Well, purchasing such an item is crucial; also, it is quite sophisticated with features. Our goal is to educate you on it and provide you with the right bait as well. Hopefully, you have already figure out who churns out that fits on your roof from this year to many years.