You’ve just got your new corrugated metal roof installed, and it’s looking great! So far, so good during the first month — there were no hiccups. That was, until you’ve found the metal roof leaks around screws. Don’t worry, this is a common problem for many homeowners. A fast call to a reliable London ON roofer with in-depth experience and knowledge is the fastest fix.

However, the reason metal roof leaks around screws are primarily because of its poor installation. Just like any other roofing material, metal roofs require the utmost care and attention to detail during installation. There is a right way to proceed with metal roof screws as per Absolute Steel‘s instructions below.

Metal Roof Leaks Around Screws: Preventative Measures

Why screws? Screws will not bend like nails when exposed to heat nor will they work themselves loose like a nail would during normal expansion and contraction that occurs with your roof.

Next, you must make sure you are placing the screws in the appropriate place for a tight fit.

Absolute Steel advises screws be installed down inside the flat of the panel and not in the top of the rib. See the illustration below.

This is important as placing a screw in the top of the rib will prohibit a good seal. If placed in the top of the rib, the screw may also potentially tilt, thus stretching the screw hole. When this hole stretches and gets bigger than the washer, the seal is then broken. Consequently, Absolute Steel restricts the use of aluminum exposed fastened panels to a length of 16’. And, 40’ in length for limit steel exposed fastened panels.(Continued)

Any London ON homeowner is familiar with screws on metal roofs. However, if you’re fixing metal roof leaks around screws, it doesn’t mean you’ll just go and use any type of metal screw you’d find. The truth is, you’ll have to find the right fasteners and washers to guarantee no leaks.

In doing so, you’ll secure your roof safely and surely on the attic. You further maximize its long-term performance and capability. Lastly, you’ve drastically lowered the risk of metal roof leaks around screws too. Roof Things has a great list of what-to-dos to find the best metal roof screws with guaranteed compatibility

Choosing the Right Screws For Your Metal Roof

“The fasteners you choose are just as important as the decision you made to reap the benefits of building with metal. A quality fastener ensures benefits like energy efficiency, lowering homeowner’s insurance and the long life associated with metal construction.
“Matching the correct fastener to your job become vital to the success of your business. Here is our top 10 list of what to look for when buying metal roof fasteners:”
  1. Use the right fastener. Screws and fasteners have metal-to-wood and metal-to-metal applications.
  2. Use a fastener that has a large washer.
  3. Hi-Lo threaded screws are used in metal-to-wood applications. (Tek screws are used in metal-to-metal applications. Stainless steel screws should be used when screwing down aluminum metal roofs. )
  4. Protect against corrosion and rust by using mechanically galvanized fasteners.
  5. Variety and choice matter.
  6. Instead of carbon steel screws use stainless steel or zinc aluminum cap screws. (Continued)

Let’s explore a different point of view. In their article, Exterior Pro Inc writes that metal roof leaks over screws is common regardless of the screws you use for your roof. Their argument: screwed-down roofs are for agricultural structure and lightweight commercial roofing (such as for warehouses).

We’ve extracted their best argument to avoid using screw-down roofs and instead use standing seam metal. However, we definitely understand any homeowner who finds the recommendation outrageous. Standing seam is an expensive roofing material that requires investment. On the other hand, their statement is still worth considering when having corrugated metal roofing.

Why Use Standing Seam Metal On Your Home?

The metal panel may last 50 years but the rubber washer keeping the water out will only last 9-15 years. Metal has the highest expansion and contraction factor of any other roofing product on the market. That means each day it expands with daytime heating and then contracts at night as the temperature cools off. This daily expansion-contraction cycle is too much for rubber washers and over time they deteriorate and loose their seal.

Screw down metal wasn’t designed to be installed on homes. Using this metal on houses with skylights, chimneys, pitch breaks, and valleys will have you relying heavy on caulking and metal roof sealants to stay leak free. (Continued)

Regardless whether you choose to use corrugated or standing seam, always choose a metal roofing contractor with in-depth experience and knowledge in installing your metal roofs. If you have yet to find one, you can count on Cub Roofing’s years of experience and roofing knowledge. Contact us today to know more about what we can do for you!