Underlayment Under Metal Roof

The first goal of roofing underlayment is to keep the roof deck dry before installation of the metal roofing material.

Underlayment under metal roof.

The roof is an important element of the building envelope. A building envelope is. Overhang the roof rake edge 1 5 and cover the underlayment with a metal rake edge trim. There are two types of underlayment for a metal roof felt paper and synthetic each with its pros and cons.

Underlayment is a vapor barrier or water resistant material that s put under metal roofing and installed directly onto the roof deck. On most projects there are two types of underlayments. Traditionally metal roofs have used standard 30 pound felt paper underlayment. Metal tile shakes slate and both asphalt and synthetic shingles.

The best underlayment for metal roofs. Underlayment materials are application focused and they come in a wide variety of materials and configurations. Underlay or underlayment can be any number of layers that come between the metal roof and the ceiling of the house. Felt underlayment the traditional and most common material used for roof underlayment on a steep slope metal roof is non perforated asphalt impregnated felt underlayment.

Therefore it is important that the metal roof underlayment allows moisture that infiltrates the underside of the metal roof to dry out. The synthetic type is a relatively newer technology and is made by spinning together polyethylene or polypropylene with a polymer. Installing the correct underlayments for your metal roof project the right stuff taking care of your building envelope. To install this underlayment first make sure your surface is free of debris and dry.

Titanium psu30 can be used under many types of roofing materials including. It s applied under all of the other materials and it provides an extra layer of protection against extreme weather conditions. Synthetic roofing underlayment is to be laid horizontally parallel to eave with printed anti slip side up starting at the bottom of the lowest roof eave with a 1 5 underlayment overhang at the eave covering the pre installed eave drip edge. It s a better and more advanced metal roof underlayment.

First two underlayment layers.