Metal Roofing Directly On Felt

The metal has air gaps for ventilating.

Metal roofing directly on felt.

If you install your metal roofing directly on plywood without the protective layers you greatly increase the odds of the roof leaking. 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. Overlap the edge of the roof by 1 inch.

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. You also run the risk of premature wood rot as the felt sheet provides a layer of moisture prevention that keeps the wood dry. Work toward the ridge. 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.

In most cases what you are doing will be fine. The thermal break created by battens is nice but not. I would like to install my metal sheets directly over the roofing felt without putting down 1 4 runners on the felt. The traditional and most common material used for roof underlayment on a steep slope metal roof is non perforated asphalt impregnated felt underlayment.

There are several types of felt underlayment including both organic reinforced and inorganic reinforced. Synthetic underlayment is a newer innovation that is taking over the metal roofing industry as a better more advanced replacement for felt underlayment. March 4 2016 at 7 54 am. We specialize in providing painted galvalume and aluminum for the architecturally driven metal panel industry.

One product that is quickly replacing the standard 30 felt paper is a line of synthetic underlayments. Install the first metal panel on the low end of the roof square to the eave. 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. Will i be okay.

Thank you very much.