How To Attach Roof Underlayment Steel Roofing

This material separates the roofing from the substrate provides secondary weather protection and guides drainage down the side of the roof.

How to attach roof underlayment steel roofing.

In normal wind zones. We recommend a polypropylene scrim reinforced underlayment made up of multiple layers. Once again this is used on cold roof construction. The underlayment also known as roofer s felt is usually asphalt synthetic or polymer based.

Here are the pros and cons to installing the metal roofing over 1x4 s. Use your hammer and nails to secure the underlayment next to the outside roof edge. Mark a chalk line 35 inches above the roof edge to align the underlayment. Nail down squarely 90 degrees into the deck to secure caps flush to the underlayment.

On center on both head and end laps. It serves as a moisture barrier as well as a slip sheet. It provides a solid flat surface to attach the new metal roof to. Place it on the outside roof edge.

Before applying roofing you ll need to cover the sheathing with roofing felt also often called tar paper most local codes call for using 30 pound felt. This type of underlayment is critical to a quality roof installation. Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails. Fasten drip edge on eaves with galvanized nails and a hammer about 12 inches.

Some roofers prefer to attach felt underlayment with 1 inch roofing nails or special nails with plastic washers but most codes allow staples which are easier to drive. Most metal shingles will be attached to the roof using metal shingle. Fasten the field area in the middle of the roll a minimum of 24 o c. Nail metal drip edge flashing which bends over the roof and down the edge of the facing board on all roof edges.

Make sure the product is designed to be used under metal. Work up from the initial row starting at the lower corner in a diagonal pattern staggering the shingles to prevent gaps. Position the roll so that 2 inches of the underlayment are able to hang over outside roof edge decking.