FAQ: Is Underlayment Needed When Installing Metal Roofs?

Blog |December 6th, 2018

Metal roofing is all of the rage right now for commercial and residential properties. Property owners are drawn to the thermal preservation, eco-friendly, and durable benefits that are derived from metal roofing. However, despite all of the amazing benefits that metal roofing can offer, there are some questions that property owners are having trouble finding answers to. One of the most common questions that prospective metal roof owners have is this: do you need to install an underlayment along with your metal roof?

Do Metal Roofs Need an Underlayment?

When you install a modern roof onto your commercial or residential property, you are going to be working with several layers. You’ll be dealing with your sheathing, your metal roof, and your underlayment. Your underlayment is installed on top of the sheathing where it acts as an insulator in order to prevent moisture from wicking through and into your building. In traditional homes without metal roofing, an underlayment is accepted as completely necessary. This is not the case when it comes to our discussion on metal roofing.

The common perception is that metal roofing is such an ideal material that you can get away with skipping out on an underlayment. Metal roofing IS an ideal roofing material due to all of the benefits that we highlighted above but it is not perfect. In fact, an underlayment is considered as necessary pretty much no matter what type of roof you are going to be installing. When an underlayment is properly installed along with your metal roof, you’ll find that your roof offers a host of additional benefits. Your property will benefit from improved insulation, leak prevention, and durability. Underlayments come in a variety of different materials including:

1) Felt Saturated Underlayment – The most common material used when you install an underlayment with your roof. This underlayment is typically installed in one to two layers. Felt underlayment installations are ideal for buildings with sloped roofs or ones that are located in drier climates.

2) Synthetic Underlayment – Typically comprised of polyethylene or polypropylene, your synthetic underlayment can be anywhere from 8 to 30 mils in thickness. These are ideal for windy and wet climates.

3) Rubberised Asphalt Underlayment – The final type of underlayment is the rubberised underlayment. Made out of rubberised asphalt or a butyl adhesive, this product simply peels and sticks to your roof. This is ideal for climates where cold and moist weather is commonplace.

Metal Roofs from Coast to City Roofing

Here at Coast to City Roofing, we believe in giving you the perfect roof for your specific needs. We specialise in metal roofing materials which include colorbond, zinkalume, and steel. We can help you to outfit your property with your new roof, gutters or rainheads. Call us today to talk about all of your roofing needs!

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