Metal Roofing Directly On Felt

There are several types of felt underlayment including both organic reinforced and inorganic reinforced.

Metal roofing directly on felt.

One product that is quickly replacing the standard 30 felt paper is a line of synthetic underlayments. 3 install 1 4 purlins down over the shingles before installing the metal roof the third way to install a metal roof over shingles is by applying 1 4 purlins over the shingle roof. Complete and separate roofing systems such as standing seam metal roof panel systems that are designed to transmit the roof loads directly to the building s structural system and that do not rely on existing roofs and roof coverings for support shall not require the removal of existing roof coverings. Doesn t provide the flattest surface for the metal roofing to be installed over each course of shingles is about a 1 8 higher than the course just below it.

Secure the metal panel to the deck by drilling 1 1 2 inch galvanized metal screws through the peak of the rib in 12 inch to 16 inch intervals. The traditional and most common material used for roof underlayment on a steep slope metal roof is non perforated asphalt impregnated felt underlayment. Work toward the ridge. The metal has air gaps for ventilating.

Synthetic underlayment is a newer innovation that is taking over the metal roofing industry as a better more advanced replacement for felt underlayment. In most cases what you are doing will be fine. Install the first metal panel on the low end of the roof square to the eave. Will i be okay.

Begin on the left side of the roof working to the right. Synthetic underlayment is a roofing accessory created by weaving spinning together polypropylene or polyethylene and a polymer to form an all over protective barrier to put between the roofing material and the roof deck. Sheffield metals is a leader in the distribution of coated and bare metal products as well as engineered standing seam metal roof ssmr wall systems. March 4 2016 at 7 54 am.

If you install your metal roofing directly on plywood without the protective layers you greatly increase the odds of the roof leaking. Overlap the edge of the roof by 1 inch. Thank you very much. The two main functions of a roofing underlayment is to keep the roof deck dry before the metal roofing material is installed and to act as a secondary weather barrier in case the roof fails for some reason.

I would like to install my metal sheets directly over the roofing felt without putting down 1 4 runners on the felt.