Installing Underlayment On Roof

Photo 7 shows the underlayment covering the felt on one edge a couple of inches.

Installing underlayment on roof.

How to install roofing underlayment the proper way. The underlayment should meet specific standards to be effective. How to install felt underlayment for a new roof. When hot roof construction is done a roof with no ventilation a breathable underlayment is recommended.

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. It s not ideal to install roof underlayments when the temperature is under 40 degrees f as it won t ensure a proper fit. Overhang the roof rake edge 1 5 and cover the. This will keep water farther away from the inside corner of the fascia.

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. Installing a roof is much more than just nailing shingles onto some boards. It serves as a moisture barrier as well as a slip sheet. This type of underlayment is critical to a quality roof installation.

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. The best time for installing roof underlayment is when the temperature is between 40 to 85 degrees fahrenheit. It starts with installing solid decking usually plywood or oriented. It is an vital part of the roofing process because it prevents water and air from damaging the roof.

In roof areas where roof planes meet to form valleys which naturally channel high water flow in wet weather and other roof penetrations such as skylights plumbing vents roof to wall intersections are also important roof areas that can benefit from peel and stick membrane underlayment installation. Be careful when you trim back the felt paper so you don t slice into the underlayment. Roofing underlayment should be installed on decking material that has no old or damaged underlayment or shingles. Here is a video about roofing underlayment.

Make sure the product is designed to be used under metal. Check this out. Finish installing felt paper on the rest of the roof overlapping the self stick underlayment. I want to be.