How To Attach Roof Underlayment Steel Roofing

Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails.

How to attach roof underlayment steel roofing. 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. Position the roll so that 2 inches of the underlayment are able to hang over outside roof edge decking. In normal wind zones the nails should be driven at 6 0 o c.

Fasten the field area in the middle of the roll a minimum of 24 o c. Once again this is used on cold roof construction. Installing the metal roofing over 1x4 s allows the ability to also install additional insulation under the metal roof that can t be done the other two ways. It provides a solid flat surface to attach the new metal roof to.

Work up from the initial row starting at the lower corner in a diagonal pattern staggering the shingles to prevent gaps. This type of underlayment is critical to a quality roof installation. Mark a chalk line 35 inches above the roof edge to align the underlayment. On center on both head and end laps.

Use your hammer and nails to secure the underlayment next to the outside roof edge. Fasten drip edge on eaves with galvanized nails and a hammer about 12 inches. This material separates the roofing from the substrate provides secondary weather protection and guides drainage down the side of the roof. Place it on the outside roof edge.

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. 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. We recommend a polypropylene scrim reinforced underlayment made up of multiple layers. Nail metal drip edge flashing which bends over the roof and down the edge of the facing board on all roof edges.

Here are the pros and cons to installing the metal roofing over 1x4 s. Most metal shingles will be attached to the roof using metal shingle. Make sure the product is designed to be used under metal.