Being proactive instead than reactive as a residential metal roofing company is the greatest way to prevent improper installation and repair details.
1. Making rivet holes in the valleys
Rivets are not required in the valley if the installation is done correctly. The underlayment may be damaged when you drill a hole for a rivet, leading to a possible leak. It also has a hole in the middle of the rivet. So, in addition to the underlayment hole, there is now a hole in the middle of the rivet that allows water to enter.
2. The flat parts of the panels have fasteners visible on the outside
Thank goodness exposed fastener roofs are a separate category from the standing seam metal roofs we're discussing here. A leak is far more likely to occur if your roof's panels have an exposed fastener (this does not include flashing points). Because it is secured through the decking, it may also impede thermal movement and generate stress spots in the panel.
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3. Eave and ridge panels are double-pinned
Panels in standing-seam roofs aren't always double pinned (if installed to our recommended details). The panels may expand and contract more quickly if the roof isn't double-pinned, which decreases the risk of oil canning and fasteners backing out. As a reference, SMI's details pin all panels at the top so that expansion may occur at the eave.
4. Using pipe boots to cover the seam
To correctly fit over a metal roof's standing seam, pipe boots cannot create sharp right angles; therefore, you must rely on caulking to make the penetration totally water-tight.
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5. As a major water barrier, a sealant is used
Sealant is applied to flashing laps and penetrations in a roof system as a supplementary defense against water infiltration. As a general rule, the sealant should not be seen on the roof; huge globs of it are utilized as a major water-blocking mechanism.
6. A modified J (or J-channel)
In metal roofing, a J-channel is used as a flashing material. It has been shown that these compounds may, in some instances, accelerate metal corrosion by trapping water and debris. Aside from limiting roof system expansion and contraction, J-channels may also reduce the risk of leaks.
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7. Making use of a C/Z-closure (especially in snow environments)
At the ridge cap, the panel's top slides into an opening. Because the panel's top is often left unfastened, it's vulnerable to slipping off the roof. Your major water-protection strategy relies only on sealing, which is not advised.
8. Incorrectly flashed roof penetrations
Flashing materials surrounding penetration sites may be installed effectively with the help of detailed instructions. Flashings for some types of skylights, for example, may be included with "recommended" installation instructions. The manufacturer often discouraged the usage of these on a metal roof.
9. Gaps of any type that may be seen from afar
It's as basic as that: Gaps lead to leaks. There should be no holes in your roof system; therefore, you must fix any that you find right away. Pests such as insects and rats may enter via cracks in a structure.
10. Leaving the metal's unhemmed edges exposed
Metal sheet and coil are rolled into panels, trim, and flashing materials by slitting to the exact length for each job. When a metal roof has an exposed edge from a cut, it must be hemmed to prevent edge creep and excessive corrosion. On the other hand, a hemmed edge tends to be cleaner and more visually appealing.