Worker Puts The Metal Tiles On The Roof

What Goes Under Metal Roofing?

You have options when it comes to the underpayment you choose for your metal roofing. It’s important to choose the one that will work best with your entire roofing system design.

Your roofing system should:

  • Be waterproof.
  • Provide thermal insulation.
  • Keep out air.
  • Retard vapor.

The underlayment will play a unique role in creating all these elements in the overall roofing system. Here’s what you need to know.

What Do You Put Under Metal Roofing?

There are a number of different options to place underneath a metal roof to help keep air, water, and extreme temperatures out.

Felt underlayment is the traditional option, and there are both organic reinforced and inorganic reinforced options.

Synthetic sheet underlayment can be a great choice when waterproofing is an absolute necessity.

Self-adhering underlayment is a great option for high-heat locations where it is imperative to protect against temperatures that might melt other options.

What Types of Underlayment Are Available for a Metal Roof?

There are a few different popular options when it comes to underlayment for metal roofing. These include:

  • Synthetic sheet underlayment. Though synthetic sheet underlayment usually do not qualify as air barriers, they are usually between 8 and 30 mil thick and help to protect against vapor, water seepage, and heat/cold.
  • Felt underlayment. Felt underlayment has long been the traditional choice, and whether you opt for the organic reinforced variety or the inorganic reinforced, it’s a solid choice. Local building codes may dictate which one will work for your location, but it’s important to note that the inorganic, glass-fiber reinforced variety often lays flatter and lasts longer.
  • Self-adhering underlayment. In desert climates, self-adhering underlayment is the option of choice because it can withstand high heat and retard vapor.

How Do I Choose the Right Metal Roof Underlayment?

The right metal roof underlayment will depend upon your location, budget, and priorities. Contact Four Seasons Roofing in Baltimore, MD, to get an assessment and quote for your location.

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