Description

Key Features

Retrofit 4×4 Mount

Designed to mount a nominal 4×4 wood post on existing concrete, so you can add or reinforce a post without tearing out the slab.

12-Gauge Steel Body

The 12-gauge steel construction gives the base the stiffness needed for a solid connection, while the black powder coat adds a cleaner finished look.

Concrete Anchor Install

Installs to concrete with four 1/2-inch anchors and fastens the post with approved connector screws, making it a practical option for fence post repair and new retrofit work.

Overview

The Simpson Strong-Tie FPBB44 E-Z Base post base is a retrofit connector made for attaching a nominal 4×4 wood post to existing concrete. This is a retrofit post base designed for mounting fence and gate posts on a concrete slab or walkway. Model Number: FPBB44. If you need a clean way to add a post where digging is not practical, this base gives you a direct wood-to-concrete mounting solution.

What matters here is the use case. The FPBB44 is built for situations where the concrete is already in place and you need to set a post on top of it instead of burying it in the ground. That makes it useful for fence post repair, gate post installation, and similar deck and fence connector work where demolition would be a waste of time and money.

The body is made from 12-gauge steel, which is the kind of spec that actually means something on the job. A heavier steel body helps the base hold shape during installation and gives the connection a more solid feel once the post is fastened in place. The black powder-coated finish also matters for exposed applications because it gives the base a finished appearance that works better in visible fencing projects than plain unfinished steel.

Installation is straightforward if you are working on sound concrete. Simpson specifies attachment to the post with eight connector screws and installation to concrete with four 1/2-inch-diameter anchors. That layout spreads the load across the base and gives the installer a predictable fastening pattern. The base is also approved for installation with Strong-Drive SD Connector screws, which is important if you want to stay inside the manufacturer’s recommended fastening system.

From a design standpoint, this is a purpose-built post base, not a generic bracket trying to do too many jobs. It is sized for a nominal 4×4 post, with an actual inside width around 3-5/8 inches and an overall width around 6-5/8 inches. That makes it a practical fit for standard 4×4 wood post work while giving enough flange area for concrete anchoring.

There is an important limitation you need to know before buying. Simpson states that this type of base does not provide adequate resistance to prevent rotation about the base, so it is not recommended for non-top-supported installations such as fences or other unbraced structures. The product is also not rated for uplift loads and should not be used for overhead structures or where wind uplift resistance is required. In plain terms: use it where the structure is properly supported and the application matches the connector’s intended role.

The Simpson Strong-Tie FPBB44 E-Z Base post base makes the most sense for homeowners, fence installers, and contractors working on retrofit wood-to-concrete projects. If you are setting a gate post on a walkway, repairing a damaged post location, or adding a 4×4 where excavation is a problem, this is the right kind of hardware. If you need a base for a free-standing, wind-loaded, or uplift-critical structure, you should move to a connector specifically rated for that job.

Mount Posts on Existing Concrete

This is where the FPBB44 earns its keep. Instead of cutting out concrete or trying to work around a finished slab, you anchor the base directly to the surface and fasten the post in place.

• Made for nominal 4×4 wood posts
• Installs to existing concrete with four 1/2-inch anchors
• Good fit for gate and fence retrofit work

Built for a Clean, Solid Connection

The black powder-coated steel body gives you both structure and a cleaner finished look in exposed outdoor work. That matters when the hardware stays visible at the base of the post.

• 12-gauge steel construction
• Black powder-coat finish
• Approximate product weight: 2.59 lbs

Know the Layout Before You Drill

This base uses a simple flange-and-shell layout that keeps installation predictable. Once your anchor holes are located correctly, the rest of the job is basic post and connector work.

• Base width is about 6.625 inches
• Base depth is about 3.805 inches
• Approved for Strong-Drive SD Connector screws

Key Specifications

Model	FPBB44
Product Type	Retrofit post base
Nominal Post Size	4 x 4
Material	Steel
Gauge	12 ga
Finish	Black powder coat
Actual Width	6.805 in
Actual Depth	3.805 in
Installed Height	5.5 in
Inside Width	3.625 in
Weight	2.59 lbs
Package Quantity	1

Compatibility

Post Size

Designed for nominal 4×4 wood posts.

Mounting Surface

Made for installation on existing concrete.

Fastener System

Approved for installation with Strong-Drive SD Connector screws. Simpson specifies eight connector screws to the post and four 1/2-inch-diameter anchors to the concrete.

Built For

Fencing Gate Posts Fence Post Repair Wood to Concrete Retrofit Outdoor Post Installation General Contracting Remodeling DIY / Hobbyist

Pro Tip

Lay out your anchor holes with the base and post dry-fit first, then confirm the post is where you actually want it before drilling concrete. On retrofit fence work, that extra check saves you from a crooked post and a patch job you did not need.

Warranty & Support

No manufacturer warranty is listed for this model in the provided product data.

Tool Nut’s Take

Tool Nut’s Take

Simpson Strong-Tie FPBB44 E-Z Base post base is the easy answer when the concrete is already there

If you need to put a 4×4 post on an existing slab, this base solves a very specific problem without turning the job into concrete demolition.

• Who it’s for: Fence installers, contractors, and homeowners adding or repairing a post on existing concrete.
• Why it stands out: It is purpose-built for wood-to-concrete retrofit work, uses 12-gauge steel, and has a black powder-coated finish that looks better in exposed fence applications than plain hardware.
• Worth knowing: This is not the bracket to use where you need uplift resistance or a free-standing unbraced post connection. Match it to the right application and it does exactly what it is supposed to do.

Common Questions

• What size post does this base fit? It is designed for a nominal 4×4 wood post.
• Can it be installed on existing concrete? Yes. This retrofit post base is made for mounting onto existing concrete with four 1/2-inch-diameter anchors.
• What fasteners does Simpson specify for the post connection? Simpson specifies eight #9 x 1-1/2 inch or eight #10 x 1-1/2 inch Strong-Drive SD Connector screws to attach the post.
• Is this post base rated for uplift or free-standing unbraced structures? No. Simpson states it is not rated for uplift loads and is not recommended for non-top-supported installations such as fences or other unbraced structures.