Metal Roof Underlayment Requirements

Metal caps shall have a thickness of at least 32 gage sheet metal.

Metal roof underlayment requirements.

13 1 frequently asked questions. For architectural metal roof panel systems a roof underlayment is required to help control water leakage through the roofing system during heavy rain storms or under snow melting conditions. Felt details for various roof slopes amp. This type of underlayment is critical to a quality roof installation.

Traditionally metal roofs have used standard 30 pound felt paper underlayment. Underlayment shall be attached using metal or plastic cap nails or cap staples with a nominal cap diameter of not less than 1 inch. This article series discusses roofing felt specifically addressing the roofing code or roofing manufacturer s requirements for use of an underlayment such as roofing felt tarpaper or other underlayment products beneath asphalt shingles and other. 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.

10 roof protector underlayment roll best roof underlayment for metal roof. It serves as a moisture barrier as well as a slip sheet. We recommend a polypropylene scrim reinforced underlayment made up of multiple layers. Is roofing felt required.

Make sure the product is designed to be used under metal. Roofing underlayment roofing felt requirements. 12 roofing underlayment wind by mcm best roof underlayment for tile roofs. 11 plastic string reinforced poly sheeting best value roofing underlayment.

At western states metal roofing we have been in the roofing industry for over 20 years and have encountered every type of scenario with both types of underlayment. Power driven metal caps shall have a minimum thickness of 0 010 inch. Becoming familiar with the metal roof underlayment options available can help you decide what s best for your commercial building. Whether you re opting for a traditional underlayment or a selfadhered option the average life span of a metal underlayment will vary depending on the product that s selected.

Overhang the roof rake edge 1 5 and cover the underlayment with a metal rake edge trim. Choosing the right roof underlayment. The first goal of roofing underlayment is to keep the roof deck dry before installation of the metal roofing material. How well roof underlayment performs will depend on which type you use.