How Older Decks Rot Your House

House rot from water damage

July 2, 2024

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Older or poorly build deck construction can wreck havok on your house. Building a deck that is safe for you and your family and also for the intergrity of your home it’s attached to, is extremely important. If not built correctly, water damage can be a nightmare for homeowners. Our expert deck installer, Zolan, sheds light on this issue. Discover how the implementation of Z-flashing can provide a solution.

Z-flashing on deckZ-flashing is an essential component in construction, particularly in siding installation, where it serves as a protective barrier against water intrusion. The ‘Z’ in its name refers to its unique shape, which resembles the letter ‘Z’ when viewed from the side. This design is crucial for directing water away from the building’s interior and preventing potential damage caused by moisture. 

The installation process of Z-flashing involves several steps to ensure that it functions correctly. Here’s a general overview of how Z-flashing works:


  1. Preparation: Before installing Z-flashing, it’s important to prepare the area where it will be placed. This usually involves marking a snap line to align the freeze board or the top edge of the siding panel where the flashing will rest.


  1. Bending: Z-flashing is slightly bent over 90 degrees to create a pitch. This pitch is vital as it allows water to run off the flashing rather than pooling, which could lead to water seeping behind the siding.


  1. Installation: The Z-flashing is then installed over the freeze board or the siding panel. It’s nailed or screwed into the wall, ensuring that it’s secure and properly aligned.


  1. Layering: After the Z-flashing is in place, the siding installation can continue below it. The flashing acts as an overlap for the next row of siding, creating a shingle effect that further prevents water from entering.


  1. Sealing: In some cases, additional sealing measures are taken, such as applying caulk along the top edge of the siding before installing the flashing, and again on the flashing before adding the next siding layer.


The effectiveness of Z-flashing lies in its ability to bridge horizontal joints between building materials. It’s installed under and at the base of an upper component, such as a piece of siding, and extends downward over a lower component. This creates a barrier that redirects water away from the joint and prevents it from leaking behind the siding.


Proper installation of Z-flashing is critical. If not done correctly, it can lead to disastrous consequences, such as mold and rot, which undermine the integrity of the siding and shorten its lifespan. That’s why it’s important to follow the manufacturer’s instructions carefully or consult with a professional if you’re unsure about the process.


Z-flashing is typically made from metal, such as aluminum, because of its durability and resistance to corrosion. It’s a relatively simple yet highly effective way to protect your home from the elements, especially in areas with heavy rainfall or snow.


In conclusion, Z-flashing is a small but significant part of building construction that plays a big role in maintaining the longevity and integrity of a structure. Whether you’re a homeowner looking to understand more about your house’s construction or a DIY enthusiast tackling a siding project, knowing how Z-flashing works is an important step in ensuring your project’s success and your home’s protection. Remember, when it comes to construction, every layer counts in shielding your home from the weather’s wear and tear.

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