Alexei Volkov
Flashing is a crucial component of deck construction, ensuring the structure's longevity by preventing moisture damage. While metal flashing and roofing felt were once the standard, vinyl Z-flashing and back flashing are now preferred for their superior protection against infiltrating rainwater. The installation process involves removing siding, sliding flashing under the house's weather-resistive barrier, and securing it with nails or adhesive. Overlapping flashing pieces and sealing joints with caulk or silicone ensure a comprehensive defence against the elements. Additionally, products like Trex RainEscape Wall Flash offer easy-to-install, self-adhesive solutions to safeguard decks from water damage.
Characteristics and Values of Installing Plastic Deck Flashing
| Characteristics | Values |
|---|---|
| Type of flashing | Plastic Z flashing |
| Shape | Z-shaped |
| Material | Vinyl |
| Installation method | Slip behind mouldings, overlap flashing pieces by at least 4", caulk the flashing, seal with mesh and GACO |
| Purpose | To prevent water and ice build-up, protect from moisture and wood decay |
| Tools | Tin snips, gutter caulk, silicone sealer, nails, roofing nails, wood blocks, fasteners, weather-resistant barrier, EPDM foam |
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What You'll Learn
- Prepare the surface by removing siding and exposing the sheathing
- Install flashing behind the ledger, ensuring it's on top of the WRB below the ledger
- Use vinyl Z flashing for effective protection against moisture
- Overlap flashing pieces by at least 3-4 inches to ensure proper coverage
- Seal the flashing with gutter caulk or silicone to prevent water and ice buildup
Prepare the surface by removing siding and exposing the sheathing
Preparing the surface by removing the siding and exposing the sheathing is a crucial step in installing plastic deck flashing. This process ensures that the flashing is properly installed and helps protect your home from water damage. Here's a detailed guide on how to complete this step:
First, purchase a vinyl siding removal tool, which will make the process easier. You will also need a hammer and a flat bar to remove the siding. Get between the two bottom pieces of siding with the flat bar and gently slide it along the lip to separate the pieces. This will allow you to remove the siding without causing any damage.
Once you have removed the siding, you will need to expose the sheathing. This is done by folding up the weather-resistive barrier (WRB) or building wrap to expose about 1 foot of the sheathing above. Tape the WRB or building wrap to the siding above to keep it out of the way and ensure it doesn't obstruct your work area. It is important to carefully handle the WRB or building wrap to avoid tearing it.
If you discover any rotten or damaged sheathing during this process, it is important to remove additional siding and replace the affected sheathing. This will help prevent water damage and ensure a secure surface for your flashing installation.
Before installing the flashing, make sure the exposed sheathing is properly protected. Ideally, the sheathing should be protected with three layers: building paper or roofing felt stapled to the sheathing, followed by back flashing, and then the Z flashing. Check your local building codes to ensure you are using the correct flashing method.
Finally, prepare the flashing by cutting it to the appropriate size and shape. You may need to bend or notch the flashing to fit around inside corners or obstacles. Ensure that you follow the manufacturer's instructions for preparing and installing the flashing. Once the flashing is ready, you can secure it in place, following the specific instructions for your chosen type of flashing.
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Install flashing behind the ledger, ensuring it's on top of the WRB below the ledger
Installing flashing behind the ledger is an important step in preventing water from infiltrating your home and causing damage. Here's a detailed guide on how to install flashing behind the ledger, ensuring it's on top of the WRB (Water-Resistive Barrier) below the ledger:
First, remove any existing siding or decking that may be obstructing the ledger. This will provide you with access to the ledger and the area behind it. Be careful not to damage the WRB or house wrap during this process.
Next, cut and trim the WRB above and below the ledger to prepare for the flashing installation. The WRB should extend at least 3 inches to the sides and 2 inches above the ledger. Fold up the WRB to expose the sheathing, and tape it to the siding to keep it out of the way.
Now, install the flashing behind the ledger, ensuring it laps onto the WRB by at least 2 inches. The flashing should extend at least 3 inches above the ledger and onto the WRB. Metal flashing or PVC flashing can be used, but ensure it is compatible with the materials used in your deck's construction to avoid issues like corrosion.
Once the flashing is in place, reattach the ledger to the house using lag bolts or structural screws. Refer to the DCA 6 guide or the International Residential Code for proper spacing and installation guidelines.
Finally, complete the flashing installation by placing a drip cap over the ledger, made from the same material as the flashing. Run a band of self-adhering membrane or flashing tape over the drip cap and the flashing for added protection. Reinstall any decking or siding that was removed during the process, ensuring a secure fit.
By following these steps, you can effectively install flashing behind the ledger, ensuring it's on top of the WRB, thus protecting your home from water damage and maintaining the integrity of your deck.
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Use vinyl Z flashing for effective protection against moisture
Installing vinyl Z flashing is an effective way to protect your deck from moisture damage. It is a water-impermeable material that prevents water intrusion by redirecting moisture away from the wood.
Z flashing is a traditional building product that remains popular due to its effectiveness and affordability. It is also easy to install and fabricate. When installing vinyl Z flashing, it is important to follow these steps:
Firstly, ensure you have the necessary tools and materials, including vinyl Z flashing, a hammer, a flat bar, roofing nails, and gutter caulk or silicone sealer. Check your local building codes and consult with your building department to ensure compliance with any specific regulations or requirements.
Next, prepare the area by removing any necessary decking and siding to access the ledger board. Be careful not to damage the building paper or tar paper during this process. Cut the siding and building wrap or felt above the ledger board to expose the sheathing. Tape the building wrap to the siding to keep it out of the way.
Now, install the vinyl Z flashing. Slip the flashing behind the ledger board, ensuring it is on top of the water-resistive barrier (WRB) and lapping it by at least 2 inches. The flashing should extend at least 3 inches up behind the WRB. Nail the flashing to the house every 12 inches, allowing for side-to-side movement in the slotted holes.
Finally, seal any joints and corners with gutter caulk or silicone sealer. Reinstall the decking and siding, ensuring a proper fit.
By following these steps and using vinyl Z flashing, you can effectively protect your deck and home from moisture damage, ensuring the longevity and safety of your structure.
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Overlap flashing pieces by at least 3-4 inches to ensure proper coverage
When installing flashing for a deck ledger board, it is important to ensure that the flashing pieces overlap sufficiently to provide proper coverage and protect your deck from water damage.
Deck flashing is a crucial component in safeguarding your deck from water intrusion and subsequent rot and decay. Overlapping flashing pieces by at least 3-4 inches is a standard recommendation to ensure continuous protection and prevent water infiltration. This overlap allows for adequate coverage, accommodating for any potential gaps or shifts in the flashing.
When installing flashing, such as vinyl "Z" flashing, ensure that it is securely attached to the ledger board and that all joints are properly sealed. Overlap the flashing pieces by at least 3-4 inches, following the manufacturer's instructions for your specific flashing material. This overlap ensures that even if there is some movement or expansion and contraction due to temperature changes, the flashing will remain effective.
In addition to the lateral overlap, pay attention to the vertical extension of the flashing. For example, when installing flashing behind the ledger, it should extend at least 3 inches above the weather-resistive barrier (WRB) and 3 inches below, with more overlap being beneficial. This vertical overlap further safeguards against moisture intrusion.
By following these guidelines and ensuring proper overlap of flashing pieces, you can be confident in the protection of your deck and the longevity of its structure.
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Seal the flashing with gutter caulk or silicone to prevent water and ice buildup
Sealing the flashing with gutter caulk or silicone is an important step to prevent water and ice buildup. This is a crucial step to ensure the longevity of your deck and to avoid any water damage.
Firstly, it is important to clean the joint well before applying any sealant. Ensure that the area is free of dirt, debris, and old sealant residue. If you are using gutter caulk, select a product that is suitable for exterior applications and will form a strong, waterproof seal. For example, a product like Advanced Gutter & Flashing by DAP is designed for exterior use and provides a reliable, waterproof seal.
When applying the gutter caulk, follow the manufacturer's instructions and ensure that you apply a generous amount to all gaps and joints. You may need to wear gloves for this step. Smooth out the caulk with a suitable tool to ensure it is properly applied and fills all gaps.
If you are using silicone, opt for a neutral cure silicone designed for roofing and flashing. Products like Sika Roofing & Plumbing Silicone or Selleys Polyurethane sealant are recommended for their durability. Silicone application may require more precision, so ensure you follow the manufacturer's instructions carefully.
It is important to note that silicone should not be used if it will be exposed to extreme temperatures or direct sunlight. Silicone is also not recommended for use below windows or in areas where water needs to drain away, as it can trap water. Instead, use a flashing tape like Sika Multiseal Flashing Tape, which can form a tight seal and direct water away from the flashing.
By properly sealing the flashing with gutter caulk or silicone, you can effectively prevent water and ice buildup, ensuring the longevity of your deck.
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Frequently asked questions
Deck flashing is a protective layer that prevents water and insects from damaging the area where your deck and home meet.
You should use vinyl Z flashing and rolls of vinyl back flashing. You can also use Trex RainEscape Wall Flash, a self-adhesive flashing that comes with a 25-year warranty.
First, remove the siding on the house. Then, install the flashing under the siding, over the top of the ledger, and down the upper lip. Make sure to use nails sparingly and only where necessary.
Use an EPDM foam, such as Trex RainEscape Wall Flash.
Choose a joist and beam tape such as Trex Protect to cover the wood and shield it from moisture.
