Installing Metal Roof Underlayment

The traditional and most common material used for roof underlayment on a steep slope metal roof is non perforated asphalt impregnated felt underlayment.

Installing metal roof underlayment.

However contractors now recognize the benefits of synthetic underlayment for metal roofing particularly when it comes to its tolerance to heat and ultraviolet uv radiation. Place the first screw. The best underlayment for metal roofs. It provides a solid flat surface to attach the new metal roof to it creates an air gap between the back of the metal and the shingle roof which allows for airflow.

Underlayment must also act as a secondary weather barrier in case the roof fails. The synthetic component of this metal roof underlayment makes it tougher than its felt counterpart. Each roll of this product covers 1 000 square feet of surface area and the whole thing weighs less than 25 pounds making it lightweight and easier to transport. The roof is an important element of the building envelope.

Allow for about 3 inch side laps and 6 inch end laps. A building envelope is. Align the first metal roofing panel so that it overlaps the edging by 1 2 to 3 4 of an inch and is square to the roof. Be sure the larger edge is laid so that the small edge of the next panel will overlap it.

Installing the metal roofing over 1x4 s allows the ability to also install additional insulation under the metal roof. Install underlayment a minimum of 6 inches up roof protrusions or vertical abutments. First two underlayment layers. The first goal of roofing underlayment is to keep the roof deck dry before installation of the metal roofing material.

Installing the correct underlayments for your metal roof project the right stuff taking care of your building envelope. The underlayment should then be cut to a length that can be easily managed. On most projects there are two types of underlayments. What types of underlayment are available for metal roofing and which is the best choice for your design or installation.

Seal with adhesive sealant or tape as described in section 6. There are several types of felt underlayment including both organic reinforced and inorganic reinforced. Learn more about how to install owens corning proarmor synthetic roof underlayment. When installing a self adhered underlayment start at the lowest part of the roof deck and install valley conditions first.

Install final flashing material. Lay the underlayment flat in place with the print side up.