Deck Screws: What Size to Use
If you are building or fixing your deck, it may be difficult to decide out of the many different kinds which deck screws to use. Here is a helpful guide to get your project going.
Just Long Enough
While the size of the screw will depend on many different factors, a general rule is to find a screw that is just long enough to hold together two boards but at the same time but will not risk splitting them because it is too long. You can tell this by just bringing the boards in when shopping for screws and holding them up. You want the screw to go about halfway into the second board making sure you can't see the tip. A #8 diameter is common for decks.
Go With the Grain
The size of the screw also depends on the grain of wood you are using for your deck. The second board getting the screw is the one you want to take note of. When you are screwing into end grain you will want to make sure that it is longer than when you are screwing across the grain.
With these tips you will be able to determine the right size deck screw that is best for your project.