Why Is Metal Roofing Nail In Flats Instead Of Ribs

But these fasteners were notorious for leaking which is why they were always driven through the high points of the roofing profile.

Why is metal roofing nail in flats instead of ribs.

Wood screws with combination metal and neoprene washers should be installed in the flat area of the panel adjacent to the ribs and tightened such that the washer is compressed as illustrated above. After doing it that way all that time it hasn t changed. As the metal roof expands and contracts it is likely that over time the screw will snap off. This is because a nail doesn t seal as well so should be kept out of the flat.

Place the first screw about 7 inches from the bottom and each subsequent screw about 18 to 24 inches apart along the vertical run. As a nail was driven and its head came in contact with the roofing the soft lead was supposed to conform to the surface of the roof to provide a seal. If for some reason you should decide to use nails put them through the top of the main ribs. Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails.

Not any of the humps. Old time roofers still continued to pre drill on the ribs while the sheets were stacked flat on the ground but then used the new gasketed screws anyway. Not on the hump. Narrowing things down a lively discussion occurred including some of his grad students on whether steel roofing and siding for post frame buildings should be attached with screws through the flats or on the tops of the high ribs.

Nail can split the washer and dimple the metal causing leaks. Which one is correct. And never put a metal roof on treated lumber. Do not put strips under the metal when going over an existing roof.

Work up from the initial row starting at. Nail can split the washer and dimple the metal causing leaks. Screw the flats not the humps. Wood screws with combination metal and neoprene washers should be installed in the flat area of the panel adjacent to the ribs and tightened such that the washer is compressed as illustrated above.

Install the roofing screws vertically along each rib in the panel.