Is Underlayment Necessary For Metal Roof

Traditionally metal roofs have used standard 30 pound felt paper underlayment.

Is underlayment necessary for metal roof.

Many people don t believe that underlayment is necessary for the metal roof because it s already a sturdy material that comes in large sized sheets and gives sufficient protection to the house. The first goal of roofing underlayment is to keep the roof deck dry before installation of the metal roofing material. Don t be shortsighted when designing for longevity. It might not be absolutely necessary but it is highly recommended especially because metal roofing is notorious for being cold in the winter hot in the summer and loud when it rains.

The underlayment for metal roof serves several purposes. Traditionally built homes will need an underlayment. The best underlayment for metal roofs. It s important to specify a new roof using both manufacturers instructions and irc s specific requirements.

Once again this is used on cold roof construction. High winds may also affect your roof. In simplest terms yes you should use underlayment with your metal roof. If your home is built with joists insulation between those joists and sheathing then an underlayment is needed before you put on a metal roof.

And remember a metal roof will have a long service life so the underlayment s service life should equal that of the metal roof. Underlayment must also act as a secondary weather barrier in case the roof fails. Make sure the product is designed to be used under metal. It serves as a moisture barrier as well as a slip sheet.

Since metal roofing is not thermally protective you need to consider buying insulation materials as well as moisture and waterproofing underlayment for under a metal roof. But there are some caveats that go with that and it depends on a variety of factors. Although this could be alright in the short term the long term effects are damaging. Therefore it is important that the metal roof underlayment allows moisture that infiltrates the underside of the metal roof to dry out.

The roof deck should be sound and level before laying the underlayment. It is imperative the underlayment is fully supported by a roof decking material as underlayments aren t meant to be used as the primary roof deck. Once you ve selected the proper metal underlayment it is important to ensure the roof s surface is prepped and ready for installation. This type of underlayment is critical to a quality roof installation.

The simple answer is yes your roof does need an underlayment. Underlayment and metal roofing i often get asked what the importance is of underlayment beneath a metal roof. What does it do and is it really necessary. Roofing underlayment or felt is usually required for the ul fire rating to apply since shingles are usually tested with underlayment.