How to Install a TAB Extension for Treehouse Supports
When building a long-lasting treehouse, proper support hardware is critical — especially when adapting an existing Treehouse Attachment Bolt (TAB) system to accommodate tree growth, structural upgrades, or advanced support systems like suspension cables and struts.
Our patented TAB Extension is engineered to help extend the life and performance of your treehouse support system while maintaining the flexibility trees need to continue growing naturally.
This guide walks you through the TAB Extension installation process step-by-step, along with important tips to ensure a safe, professional-quality installation.
What Is a TAB Extension?
A TAB Extension is designed to fit over an existing Treehouse Attachment Bolt perch, extending the connection point outward from the tree. This creates additional room for future tree growth while allowing you to integrate advanced support systems such as:
- TISS suspension cable supports
- TISS strut supports
- Floating and static brackets
- Load-bearing platform framing systems
HD Tab Extension installed over an old treehouse attachment bolt, with attachment using our new Universal Floating Bracket and Suspension Anchor.
TAB Extensions are especially useful for retrofits, upgrades, and long-term maintenance of mature treehouse structures.
Where perch real estate is lost due to tree growth, you can easily accommodate any new requirement, by adding our patented TAB extension components over the original fasteners, along with a Strut or Suspension Kit for reinforced support.
Some common problems that the our Treehouse Integrated Support System™ solves include:
- Tree growth over TAB perches, resulting in reduced beam clearance and tree health issues;
- Tree growth that consumes suspension anchor points, rendering them un-inspectable and potentially unsafe;
- TAB support options above (Suspension) and below (Strut) the perch, to provide options regardless of tree shape and size, or architectural features.
Before You Begin
Before starting installation, gather the following tools and materials:
- Shore jacks or temporary support posts
- Wire brush or sander
- 1/4” metal drill bit
- Drill and driver
- Structural screws
- Included locking pin and cotter pin
- Safety equipment
Always inspect the existing TAB and surrounding tree condition before beginning work.
Our Tab Extender is available as part of our exclusive Treehouse Integrated Support System (TISS™) in kits with your choice of a Strut or Suspension Anchor.
Step 1: Relieve the Load
Raise the load-carrying member on both sides of the attachment point by at least 1 inch. This removes pressure from the existing connection and creates working space for the installation.
Install shore jacks or temporary supports to safely carry the structural load throughout the process.
Important: Never attempt to remove attachment hardware while the structure is under load.
Step 2: Remove Existing Hardware
Remove all existing attachment hardware from the TAB perch.
You’ll need a minimum of 3 inches of exposed perch beyond the tree surface for proper installation.
If the tree has developed heavy bolstering growth around the TAB, carefully trim back the growth to create a flat mounting surface at the base of the perch. The cleared area should be at least as large as the outer diameter of the TAB Extension.
In some cases, additional growth removal may be required to expose the necessary perch length.
Step 3: Clean and Test-Fit the Extension
Use a wire brush or sander to remove corrosion or buildup from the exposed TAB perch.
Once cleaned, slide the TAB Extension onto the perch.
The extension should fit snugly:
- Tight enough to eliminate slop
- Loose enough to install without force or hammering
If excessive force is required, remove the extension and inspect for debris or deformation.
Step 4: Orient the Ear Tabs Correctly
Rotate the TAB Extension into the proper orientation for your support system:
- Ear tabs facing upward: for TISS suspension cable supports
- Ear tabs facing downward: for TISS strut supports
The tabs may be angled up to 5 degrees left or right if needed to align with leaning trees or offset support geometry.
Proper alignment at this stage is critical for smooth support system installation later.
Step 5: Drill Pilot Holes
Press the TAB Extension firmly against the tree surface while maintaining proper orientation.
Using a 1/4” metal drill bit, drill into the existing perch from both sides using the pilot holes in the TAB Extension as guides.
Take care to keep the extension flush against the tree during drilling.
Step 6: Drill Through and Test the Locking Pin
Once the pilot holes intersect in the center of the perch:
- Remove the TAB Extension
- Drill straight through the perch from both sides
- Test-fit the included black stainless steel locking pin
The pin should slide cleanly through the hole from either direction.
Remove the pin before proceeding.
Step 7: Reinstall the Assembly
Place your attachment hardware — either a floating bracket or static bracket — over the TAB Extension and reinstall the assembly onto the perch.
Align the pilot holes with the drilled locking-pin hole and insert the locking pin through the entire assembly.
This creates a secure mechanical lock between the existing TAB and the extension.
Step 8: Secure the Locking Pin
Insert the included 1/16” cotter pin through the locking pin to secure it in place.
Double-check that:
- The locking pin is fully seated
- The cotter pin is properly bent and secured
- All components remain flush and aligned
Step 9: Install the End Support System
Install your TAB Extension support system according to the appropriate instructions for:
- TISS suspension cable systems
- TISS strut support systems
Proper support installation dramatically reduces stress on the treehouse framing while allowing controlled tree movement.
Step 10: Lower and Fasten the Load-Carrying Member
Carefully lower the load-carrying member back onto the attachment hardware until:
- The member is fully seated
- The hardware is centered properly
- The structural load is transferred evenly
Fasten the hardware using the provided:
- Four 5/16” x 4” structural screws
Verify all hardware is secure before removing temporary supports.
Step 11: Allow Room for Future Tree Growth
Position the load-carrying member on the TAB Extension to provide adequate clearance for future tree growth.
The ideal spacing depends on:
- Tree species
- Growth rate
- Platform design
- Structural layout
Planning for future growth now helps prevent costly modifications later.
Important Height Adjustment Notes
Keep in mind that TAB Extensions slightly increase platform height at the attachment point:
- SD Extensions: increase height by 1/4”
- HD Extensions: increase height by 3/8”
If this creates an unacceptable level condition, notch the load-carrying member accordingly before lowering it onto the hardware.
Why Builders Choose TAB Systems from
Treehouse Supplies
Professional treehouse builders trust TAB systems because they are specifically engineered for:
- Structural strength
- Tree health
- Long-term durability
- Dynamic movement
- Future growth accommodation
Whether you’re building a backyard platform, luxury rental treehouse, or commercial canopy structure, using the right support hardware makes all the difference.
