Omar Khalid
Plastic sheets can be used under a deck for waterproofing. However, some people suggest not using plastic sheets under a deck because the plastic can trap water against the underside of the deck, causing it to rot. Instead, it is suggested to build a separate roof suspended just underneath the deck joists. Additionally, the plastic has a much shorter lifespan than your deck, so it is only a temporary solution. Nevertheless, if you still wish to install plastic sheets under your deck, you can staple flexible rubber or plastic sheets to the tops of the deck joists to catch drips that fall through the cracks.
| Characteristics | Values |
|---|---|
| Purpose | To prevent moisture from coming up through the ground and causing rot |
| Materials | Plastic sheets, corrugated fibreglass panels, galvanized steel, or plastic roofing panels |
| Installation | Staple or screw sheets to the tops of the deck joists; slope the sheets to allow for drainage |
| Concerns | Plastic sheets may trap water, causing rot; plastic has a short lifespan and is a temporary solution |
| Alternatives | EPDM rubber roofing material, separate "roof" suspended under the deck, gravel, concrete, wire fence |
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What You'll Learn
Plastic sheets for drainage
Plastic sheets can be used to waterproof the area under a deck. This can help prevent rainwater from dripping down between the deck boards, creating a dry space underneath that can be used for seating or storage.
One way to do this is to install corrugated roofing panels made from materials such as fiberglass, galvanized steel, or plastic. These panels are attached with roofing screws that have hex heads and neoprene washers for sealing. Gutters can also be installed to catch rainwater and redirect it away from the deck.
Another option is to use high-density polyethylene (HDPE) sheets, which are flexible, durable, and resistant to punctures and tears. These sheets can be overlapped and connected using HDPE double-sided seam tape for larger drainage projects. HDPE sheets are available in a range of widths and thicknesses and can be used in both horizontal and vertical applications.
When using plastic sheets for drainage under a deck, it is important to consider the slope of the surface to ensure proper water runoff. The sheets should be installed with a gradual slope to allow water to drain effectively.
Some people have expressed concerns about plastic sheets trapping water against the underside of the deck and causing rot. To address this, it is recommended to have a separate "roof" suspended just underneath the deck joists or to use alternative materials such as aluminum flashing or EPDM rubber roofing.
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Installing corrugated roofing panels
Planning and Preparation:
Before starting the installation, it's important to check local building codes to ensure there are no restrictions on using corrugated roofing. Additionally, gather the necessary materials, including the roofing panels, screws with washers, sealant, closure strips, and any other included components such as flashing and peak seals.
Installing the Panels:
Start by cutting the panels to the desired length with an angle grinder. Pre-drill holes on the end and side ridges of the panels, spacing them 6 to 8 inches apart. Place each panel directly onto the purlins attached to the roof trusses, starting from the outside edge of the roof. Screw down the panels using the pre-drilled holes, and snug the screws enough to compress the washers slightly without denting the panels.
Overlap the next panel onto the installed panel, attaching it in the same way. Continue across the roof, overlapping each panel by 3 to 4 inches or one ridge. When starting the second row, overlap each row by 4 inches. Drive the screws so that they hold the panels securely, and continue until the entire roof is covered, leaving the peak exposed.
Additional Considerations:
To prevent leaks, avoid drilling holes for screws in the valley of the ridges. Work from the sides using ladders or movable scaffolding to avoid walking on the panels. If you wish to install gutters, plan ahead and leave space for them, and consider the attachment method based on your deck's structure.
By following these steps, you can effectively install corrugated roofing panels to create a functional and protected space under your deck.
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Using gravel for coverage
Installing gravel under your deck is a great way to improve drainage, prevent moisture buildup, deter weeds, and stabilise the ground to prevent soil erosion. It also gives your deck a clean, polished look and makes the space underneath more visually appealing.
To install gravel under your deck, you will need to first clear away any existing vegetation or debris from the space. Then, level out the ground as much as possible with a rake or shovel. You can use sand or soil to fill in any low spots and create an even surface. Consider using a concrete levelling compound for better results if there are large dips or bumps.
Before adding gravel, it is recommended to lay down a weed barrier fabric or landscaping fabric. This will help prevent weeds from growing up through your gravel layer while still allowing water to drain properly. Ensure all seams overlap by at least 6 inches and that no gaps remain uncovered.
Once the fabric is installed, spread a layer of gravel over the entire area using a rake or shovel. A 2-3 inch layer of gravel is typically sufficient, and you can use the following formula to calculate the amount needed: Area (in square feet) x Depth (in feet) = Volume (in cubic feet). Divide by 27 to convert cubic feet to cubic yards, as gravel is typically sold by the cubic yard.
When choosing the type of gravel, consider factors such as drainage, compaction, aesthetics, and cost. Crushed stone is a popular option as it compacts well, provides excellent drainage, and is affordable. Pea gravel is also a good choice for its smooth texture and uniform appearance, but it may shift more over time. River rock is another option, known for its beautiful, clean look, but it tends to be more expensive.
You can also mix different types of gravel together for added texture and visual interest. Just remember that smaller gravel sizes can be more easily scattered or washed away, so consider using larger sizes or a combination of sizes to create a stable base.
By following these steps, you can effectively install gravel under your deck to improve its functionality and aesthetics.
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Building a separate roof
Firstly, you will need to purchase your roofing panels. You can use corrugated fiberglass, galvanized steel, or plastic roofing panels for this project. The panels should be around 26 inches wide and 12 feet long. You will also need to buy roofing screws with hex heads and neoprene washers for sealing.
Next, you will need to install the panels. Screw treated 2x4 purlins to spacer blocks to support the panels and provide the necessary slope. The panels should slope towards the outside edge of the deck about 1/4 inch per foot. Overlap the panels as you install them, and cut them to size if needed.
If you want to install gutters, plan ahead and leave space for them. You will need to purchase gutter straps, end caps, a downspout outlet, downspouts, and special glue to join the sections. PVC gutters are a good option as they are inexpensive and easy to install.
Finally, attach the gutters to the underside of the deck using the gutter straps and glue. Make sure to slope the gutters slightly towards the downspout to ensure proper drainage.
With this separate roof system, you can now enjoy a dry and shaded space under your deck!
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Waterproofing with gutters
Firstly, plan ahead and leave space for the gutters. The specific attachment method will depend on how your deck is built. If the beams of your deck are out of reach, you can nail vertical 2x4s to every other joist to provide an attachment point for the gutters.
Next, choose the right type of gutters. Inexpensive and easy-to-install PVC gutters are a popular choice. To install them, you will need gutter straps, end caps, a downspout outlet, downspouts, and special glue to join the sections.
When installing the gutters, ensure that they are securely attached and aligned correctly to guide the water flow effectively. Gutters are particularly useful if the water from your deck falls onto a patio, as they can prevent splashing.
By installing an under-deck gutter system, you can redirect rainwater away from the deck area, creating a dry and shaded space underneath. This simple and low-cost solution will enable you to make the most of your deck, even during warm summer rainstorms.
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Frequently asked questions
Installing plastic sheets under your deck can help to prevent moisture from coming up through the ground and causing problems like cupping or rotting.
To install plastic sheets under your deck, you will need to cut the sheets to fit the space and ensure that the ground is properly prepared. This means making sure that the surface slopes away from the house or towards drainage so that water does not pool.
It is important to ensure that the plastic sheets are installed correctly to prevent water from becoming trapped against the underside of the deck. One way to do this is to sandwich the plastic between the joists and a layer of PT 1x2, rather than between the decking and joists. You should also consider the lifespan of the plastic and the need for proper drainage.
Some alternatives to using plastic sheets include using a heavy-duty weed barrier under gravel, building a separate "roof" suspended under the deck, or using EPDM rubber roofing material.
Some potential issues with using plastic sheets under a deck include the risk of trapping water and causing rot, the short lifespan of plastic compared to the deck, and the potential for plastic to become a bug habitat.
