What type of bolt or screw is best for securely fastening the bottom of a post to a side tread to ensure long-lasting stability?
Asked by Brittany Foster 
3 months ago
Last Updated: September 9, 2024
Do you know the best way to attach the bottom of a post to the side tread? I’m looking for a bolt or screw that will really keep it secure. The old bolt on the post ended up cracking it over time and didn’t hold up well. I just want to make sure the post stays sturdy for the long haul. Any suggestions on what to use?
You can secure it by shooting a nail through it or using a 4×4 bracket.
That’s a 4×4 post
Can you pass me the hammer? I need to tighten these nails on the wobbly table.
Also sells brackets for those. The picture was difficult to make out.
Make sure to use strong nails for wood floors and tapcons or similar for concrete floors to securely attach the bracket.
I have a concrete floor outside with a metal hood on a post, but the post is not secured into the concrete. Not sure what I can use on it.
Hey there! 1/4”x5” lag bolts will do the trick, but keep in mind that the stair stringer plays a big role in how sturdy the post will be. Even with a strong connection, if the staircase corner bends or flexes, the post will too. That’s why I like to either sink my bottom posts in concrete or bolt them to the pavement below for added support. I also like to place the post inside the staircase corner, which may require some tread removal and cutting, so it can be framed in for extra reinforcement. Just remember, this might not line up perfectly with the railing if it wasn’t originally designed that way.
Could you please share your location? Location plays a crucial role as codes, practices, and safety requirements vary based on location, climate, and local regulations. Additionally, it’s important to consider factors like termites and frost, which may necessitate using a 4×4 instead of a 2×4, bolting to a frost-proofed footing, or waterproofing and sinking in concrete. Providing location details with each post is essential for receiving accurate answers, as otherwise, there is a high chance of getting incorrect information.
Yep, I used some long bolts, nuts, and washers.
Just a quick tip: wood should not come into direct contact with concrete. Instead, use strips of vapor barrier or similar material to separate them.