How Long Should A Deck Screw Be: Real-Time Analysis

Does everyone want to know how long a deck screw should be in your wood projects? Let’s find it out. A deck is a structure generally made from wood located adjacent to the house. It can also be located on any kind of property. People use this new interior design to decorate their houses beautifully. But it needs construction to make. It requires many different types of tools, machines, and fasteners for construction.

A deck screw is also a necessary thing to make a deck. Deck screw plays a vital role in it. But it needs to be chosen for the perfect type and size. For several parts or decks, there are several sizes of screws. Now it is your responsibility to find the right size of deck screw.     

Complete Answer on How Long Should A Deck Screw Be 

Choosing the right size of screw for the deck is an important decision. You need different sizes of screws for each part of the deck. The screw comes in many styles. The best size for the deck is 21/2- to 3 1/2-inch in length. Deck screws are sharp, tapered, and coated. It is usually machined with a Philip, square, or combination head. But square heads are better than others.

On Deck Framing

Deck farming is connected to the post and each other with lag screws. Lag screws are larger in diameter. The screws should be at least ½ inch in diameter to support the deck’s weight. Less than ½ wouldn’t be strong enough to carry the weight.

On Railings and Stairs

The best screw for the railing for the deck is ½ inch in diameter. Galvanized coating screws would be great for durability. The railing screw of the deck has to be around 6 inches in length for 4*4 inches for the railing.

On Joists to Beam

Using hurricane ties to joists to beam would be great. The most suggestive screw for this would be a Simpson SD 10-inch diameter. Hurricane ties require screwing thickness into the joist. So a 1 ½ diameter SD screw would be great for connection.    

On Joist to Ledger Board

The joist of the ledger board needs a joist of the hanger. The 2 ½ long SD galvanized screws work best for deck ledger boards. The small diameter makes driving screw holes easier.   

About Decking Screw Sizes

There are several types of deck screws available in the market. It also comes in various sizes. This is because every screw has different sizes of body parts.


Gauge refers to the diameter of a screw. A larger gauge means a longer screw. So if you want a bigger screw to go for a high gauge, they are sown in diameter (¼) instead of gauge. A high gauge is suitable for deck firming.


The length of the screw means how long a screw is. The length of the deck is the most critical thing to consider while selecting the deck screw. As we discussed, screws must go around one or half an inch to the deck board. The larger screw is best for a joist. 

Thread Size

Every screw comes with different threads. Thread size is listed as coarse in the pack of the deck. So thread in the screw is used for grip and get extra hold. But the thread is not considered that much because it doesn’t have that much. 

What To Choose, Deck Screw Vs. Nail?

Deck screws and nails have different feathers but are used for the same goal. Nails are fasteners that are less popular among workers. It doesn’t have a thread to get extra grip and strength. So a high load or high joint isn’t suitable for nails. Thus, nails are less expensive compared to scores. In addition, it is easy to use and easy to remove. 

On the other hand, screws are great for joining compared to nails. It has the tensile strength to hold the weight of the deck. As a result, it holds the deck more securely. It isn’t that expensive, but it’s a little more expensive than nails. It is also easy to use and remove. But making screw strength is the main thing you need. So screw is the winner in this debate.   

Related: How To Remove Wood Screw Plugs: 5 Methods With Steps

Types Of Deck Screws Are Available

Since there are different types of work on making decks, you need different types of deck screws to make you work more easily.

Regular Deck Screws

A regular screw gets used for easy work. The regular screw comes coated with zinc and another waterproof coating. Generally, deck screws are made of steel. It has two different colors: green and brown. It has a variety in length and gauge. It’s used for deck screws; less expensive and more effective.

Structural Screws

Structure screws are the thickest screws. Its design is made to carry a high load. So the screw can use to attach a joist to ledger boards, a beam to the joist, and a railing. It comes with a corrosion- coating. It comes with high-quality steel.  

Hidden Decking Screws

Seeing screws on the deck can be aesthetically unpleasant. It affects good looks. Hidden screws are made for this situation. Hidden deck screws are suitable for deck boards. It can be used in the middle of the deck and is better for angle holes. It is good to attach a board to the joist. 

Read: How To Screw into Pressure-Treated Wood? Simple Steps Ever

Composite Fasteners

Composite screws are those screws that have a much smaller head and tightened head. A smaller head helps to reduce composite tear-out. There is a reverse thread under the head. This head helps the screw to sit perfectly under the deck board. It doesn’t need any pre-drill and has a waterproof coating.  

Lag bolts

Lag bolts are one kind of toughest fastener. These are great for heavy joint lumber and other heavy materials. Compared to typical screws, These are comparatively massive in size. However, unlike ordinary bolts, lag bolts have a point. It works best for a ledger board.    

Truss Head

Truss’s heads are also called mushroom heads. Its head is extra wide, and It has a larger bearing surface. Also, it has a lower profile than a rounded head. It is suitable for large-diameter wood boards. But there is a difficulty in removing the head. It is the most popular type of screw. 

Hex Head 

Hex-head screws are screws with hexagonal-shaped heads. These heads can be tightened with any socket. It can join heavy deck boards. Hex head screws had a tapered point, which helps insert them into the pilot hole easily. Some have slotted Philip’s heads.  

Round Head Screws

The rounded head screw is also called a pan head. It is the most common type of screw. It must be used when there is a flat bottom like a deck. Actually, round head screws are suitable for holes that are pre-drilled or threaded. It comes in many length sizes in the market.    

Tips on Choosing the Right Size Screw for Your Project

To finish your work perfectly, you need to know the right fastener size. Wrong tools can obstruct you from finishing your project. To find the right size of screw, you have to judge its type, materials, and size according to your work.

There is not any specific calculation for choosing a screw size. It’s all about your common sense. A screw should not be too long or too short. First, it must be long enough to insert into both boards or wood parts. Some specialists believe screws should be three times longer than a wood’s thickness.

 For example, if your wood is 1 inch thick, you need at least 3 inches of the long screw to secure other parts.

Consider the diameter or gauge of the screw. The screw gauge is measured at the smooth portion of the. The higher the gauge, the more holding power it provides. To join heavy material, use a high gauge.  


That’s what you should know about how long should a deck screw be and which material it should be off.

Thanks for visiting our website to find your solution. We have tried to give you authentic information about deck screws and the right size.

There are lots of screw sizes for different parts of the deck. After reading this article, you will know which size of the screw should be used on which parts.

We have given the information about screw parts like gauge, length, and thread. 

We have given different types of screw names and details. Find the screw that is eligible for your work.

Hey, I'm George Fanton. I've over nine years of experience in the woodworking industry. I've cultivated a deep interest in practical wood and tasks. I enjoy sharing new information on woodworking technology to maintain my expertise in the current woodworking industries.

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