How To Attach Roof Underlayment Steel Roofing

Nail down squarely 90 degrees into the deck to secure caps flush to the underlayment.

How to attach roof underlayment steel roofing. Mark a chalk line 35 inches above the roof edge to align the underlayment. Here are the pros and cons to installing the metal roofing over 1x4 s. This type of underlayment is critical to a quality roof installation. Fasten the field area in the middle of the roll a minimum of 24 o c.

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. 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.

It provides a solid flat surface to attach the new metal roof to. 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. Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails. We recommend a polypropylene scrim reinforced underlayment made up of multiple layers.

Use your hammer and nails to secure the underlayment next to the outside roof edge. In normal wind zones. Once again this is used on cold roof construction. Fasten drip edge on eaves with galvanized nails and a hammer about 12 inches.

Most metal roofs will also require underlayment as well as a slip sheet. The underlayment also known as roofer s felt is usually asphalt synthetic or polymer based. In normal wind zones the nails should be driven at 6 0 o c. Most metal shingles will be attached to the roof using metal shingle.

Place it on the outside roof edge. This material separates the roofing from the substrate provides secondary weather protection and guides drainage down the side of the roof. On center on both head and end laps.