What Size Screws to Use for Decking Boards, Frame, Railings?

When building a deck, there are many decisions to make. One of the most important is what size screws to use. Different materials require different screws to ensure that they are properly fastened and will not come loose over time.

In this blog post, we will discuss the best screw sizes for decking boards, frames, and railings. We will also provide some tips on how to choose the right screws for your project!

Understanding Decking Screw Sizes

When choosing screws for your project, it’s important to consider the size of board you’re using and how much weight will be put on them.

Gauge

There are a variety of screws available on the market, and it can be confusing to know which screw is best for your project. You need to consider the gauge is how thick the metal shaft of the screw is, and it is measured in inches. The most common decking screws are #12, #14, and #16 screws. Let’s take a look at what each size means:

• Number 12 screws are 0.112 inches in diameter (Gauge). They are typically used for attaching decking boards to joists or framing members.
• Number 14 screws are 0.138 inches in diameter. They are typically used for attaching decking boards to posts or railings.
• Number 16 screws are 0.164 inches in diameter. They are typically used for attaching decking boards to posts or railings.

Length

The length of a screw refers to how long the screw is from tip to end. Most decking screws have a length of ¾ inch, but there are other lengths available as well. These include:

• ¼ inch (or 0.25 inches) – these are usually used for attaching smaller boards and not as much weight will be put on them at one time so they don’t need anything stronger than this gauge size! If you’re using larger lumber then make sure it’s secured with something stronger such as #12 or #14 screws before installing any type of floorboards over the top because otherwise, those areas could cause problems down the road if someone steps too hard on that spot!
• ½ inch (or 0.50 inches) – these screws are a good choice for attaching decking boards to framing members or joists.
• ⅝ inch (or 0.625 inches) – this screw is a good choice for attaching decking boards to posts or railings.
• ¾ inch (or 0.75 inches) – the most common length for deck screws, these are ideal for attaching decking boards to other boards, frames, railings, and posts.

Thread Size

The size of the screw’s thread is also important to consider. The most common screws have a thread size of #14, which means that the diameter of the thread is 14/100th of an inch. There are other sizes available as well, including:

• #12 – this screw has a smaller thread size than #14 and is ideal for attaching smaller boards or when less weight will be put on them at one time.
• #16 – this screw has a larger thread size than #14 and is ideal for attaching thicker boards or materials.

When attaching decking boards, it’s important to use screws that are the correct size and have the right length and gauge. If you’re not sure which screws to use for your project, ask a hardware store employee for help! They will be able to recommend the best screws for your specific application.

Types of Deck Screws

A deck screw is a type of threaded fastener that can be used to secure decks, railings, and other structures. There are many different types of screws available on the market today. Some examples include.

Regular Deck Screws

The most common type of deck screw is the regular deck screw. It is available in a variety of lengths and diameters, has a Phillips head, and can be used for both indoor and outdoor projects. Regular deck screws are perfect for attaching deck boards, framing members, railings, and other structures.

They are also relatively affordable compared to other types of screws, making them a popular choice for DIYers.

Structural screws

Structural screws are a type of fastener specifically designed for building decks. They have an auger bit tip that is made to drill through wood, which makes them ideal for structural applications such as deck framing. Structural screws do not require pre-drilling and come in different lengths and diameters so they can be used in various types of construction projects

There are several advantages to using structural screws over regular deck screws:

• Structural Screws can be installed without pre-drilled holes or countersinks as long as the material being fastened has enough sheer strength (i.e., it doesn’t break apart easily). This means you don’t need special tools like drills bits or screwdrivers just to install these screws.
• Structural screws are made of harder steel than regular deck screws, which makes them less likely to strip out or break when being driven into hardwoods like oak or cedar.
• They have a patented tapered thread design that allows them to grab the wood fibers and pull them tight as the screw is driven in, providing a more secure connection than a regular deck screw.

If you’re building a new deck or repairing an existing one, it’s worth considering using structural screws instead of regular deck screws. They may be a bit more expensive but they offer many advantages that can save time and frustration down the road.

Hidden Decking Screws

Another type of deck screw is the hidden decking screw. As its name suggests, this type of screw is designed to be hidden from view once the decking boards are installed. It has a special head design that allows it to be driven below the surface of the board and is available in both Phillips and Torx drive styles.

Hidden decking screws are perfect for applications where you want the screws to be inconspicuous, such as when using a clear or translucent decking material like PVC or composite. They’re also a good choice for decks with metal railings since the heads will blend in with the railing hardware.

If you’re looking for an easy way to hide your screws, consider using hidden decking screws.

Stainless Decking Screws

Stainless decking screws are a type of screw that is made from stainless steel. This makes them corrosion-resistant and ideal for use in outdoor applications where the screws may be exposed to moisture or chemicals.

Stainless decking screws are available in both Phillips and Torx drive styles, and come in a variety of lengths and diameters. They can be used for both indoor and outdoor projects, making them a versatile choice for any deck build.

If you’re looking for a corrosion-resistant screw to use outdoors, consider using stainless decking screws.

Composite Fasteners

Composite fasteners are a type of screw that is specifically designed for use with composite decking materials. They have a special head design that allows them to be driven below the surface of the board.

Composite decking screws are available in a variety of sizes, but what is the best size to use for your deck? The answer depends on the construction of your deck.

When installing composite decking, it’s important to use fasteners that won’t corrode or discolor the material. Composite decking screws are treated with a coating that helps protect them from the elements.

Lag bolts

Lag bolts are another type of screw that can be used for decking. They are available in a variety of sizes, have a hex head, and are driven into the wood with a wrench. They offer more holding power than standard deck screws and are ideal for attaching large items such as beams or posts to your deck frame.

While there are many different types of screws available on the market today, the ones listed above are some of the most popular choices for decks. When choosing which type of screw to use, consider your budget and the look you’re trying to achieve. You can also find a variety of decking screws online or in hardware stores that are geared toward specific applications.

What Size Screws to Use for Decking

There are a few size screws you can use when building your deck.

Deck Boards

The most common screw size for decking boards is #14 x ½”. This will provide enough holding power to keep the board in place, while still being small enough so that it won’t be visible once the deck is finished. If you are using a thicker board or one with a lot of knots, then you may want to use a #16 x ¾” screw instead.

Deck boards are typically made out of either cedar, redwood, or pressure-treated pine. All three types of wood can last for many years with proper care, but cedar and redwood have a natural resistance to decay and insects. When purchasing your decking boards, make sure to select ones that are straight and without any major knots.

When installing your deck boards, make sure to stagger the joints so that they are not all in a straight line. This will help strengthen the deck and make it more visually appealing. Leave a ¼” gap between each board to allow for proper ventilation and drainage.

Post to Beam

The most common size screw for the post to beam connectors is #12 x ½”. These screws are usually self-tapping and will be easier to install than standard wood screws with a pilot hole. Make sure that the connector you are using has enough holding power for the type of posts and beams being used on your deck.

The dimensions should also allow room around all four sides (including the bottom) so there isn’t any interference with surface drainage or ventilation.

The post baseplates should be attached securely to the deck joists using lag screws/bolts that are long enough to reach through both pieces of wood without protruding past them by more than one inch (this is important because it ensures proper holding power and prevents the plate from slipping out). If you don’t have access underneath your deck, try using shorter screws instead.

If there isn’t enough room on top of each board for a screw head clearance hole, then use an Offset Hex Head Self-Tapping Screw which has been designed specifically for this purpose and will not split or over-penetrate into softwoods like pine or cedar when used correctly!

Joists to Beam

The size of screws you’ll need for your joists and beams will depend on the type of lumber you’re using. If you’re using pressure-treated lumber, use a #14 screw. For cedar or redwood, use a #12 screw.

Joist to Ledger Board Connection

For ledger board to joist connection, use minimum #14 x 120 Deck screws. Pre-drill a pilot hole before driving the screw. Use a washer if available. For cedar or redwood, use a #12 screw. If you’re using pressure-treated lumber, use a #11 screw.

Railings

When attaching railing posts to concrete, use a minimum of two (preferably three) #14 screws per post. When attaching railing posts to wooden decks, use at least one #14 screw per post. Make sure the screws are long enough to penetrate the decking material by at least an inch.

Stairs

For the stairs, use screws that are at least three inches long. Make sure to pre-drill holes before using the screws, especially if you’re using composite decking material. You can also use washers if you’re worried about the screw heads pulling through the wood.

If you have any questions about what size screws to use for your specific project, please consult with a professional contractor. They will be able to help you choose the right screws for the job and give you tips on how to properly install them.

Conclusion

A deck is a great way to enjoy the outdoors and relax in your backyard. Not only is it a place to entertain guests, but it can also be a great place to spend time with family and friends. In order for your deck to last for many years, however, you need to use the right screws.

If you have any questions about what size screws to use for your decking boards, frame, and railings, please don’t hesitate to contact us. We would be happy to help! Thanks for reading! Happy building! ????