The TISS™ Suspension Anchor system is designed to create strong, adjustable suspension support points for treehouse platforms and structural stabilization systems.

Using the Treehouse Supplies Universal Suspension Bracket (USB), suspension cables, turnbuckles, and shackles, builders can create secure overhead support connections that integrate seamlessly with the Treehouse Integrated Support System (TISS™). 

 

This guide outlines the recommended installation procedure for properly installing aTISS™ Suspension Anchor.

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What Is a TISS Suspension Anchor?

A TISS™ Suspension Anchor uses the same Universal Suspension Bracket hardware utilized in TISS strut systems. When configured as a suspension anchor, the bracket is installed higher in the tree and connected to:

• A turnbuckle
• Suspension cable
• Shackles
• TAB support hardware

This creates an adjustable suspended support system capable of handling dynamic loads while allowing for long-term adjustability and tree movement. 

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Tools & Materials Needed

Before installation, gather the following:

• Universal Suspension Bracket (USB)
• 1.25” lag bolt
• Suspension cable with eye loops
• Turnbuckle
• Shackles
• 1-1/8” auger bit
• 1-5/8” auger bit (recommended for hardwoods)
• Heavy-duty drill
• Wrenches and sockets
• Rubber mallet (optional)

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Step 1: Assemble the Suspension Hardware

Begin by assembling the suspension system components before locating the mounting point on the tree.

Attach the following components together in sequence:

1. Universal Suspension Bracket (USB)
2. Turnbuckle
3. Suspension cable
4. Shackle
5. TISS support end connection 

TISS™ Suspension Anchor Kits are available in Standard Duty and Heavy Duty

 

Important

For suspension anchor applications, the USB should be rotated so the attachment points face upward rather than downward as they would in a strut support installation. 

TISS strut support installation

 

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Step 2: Determine the Anchor Location

Extend the entire suspension assembly to its full length. 

Using the fully assembled system:

• Hold the assembly in its intended operating position
• Pull the cable tight
• Use the USB position to identify the proper mounting point on the tree

This ensures the suspension system aligns correctly once fully tensioned.

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Step 3: Mark the Drilling Angle

The Universal Suspension Bracket should be installed at a slight downward angle into the tree. 

Mark the installation point carefully before drilling.

Recommended Angle

• Approximately 15–20 degrees downward

This angle helps improve load transfer and holding strength.

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Step 4: Drill the Pilot Hole

Using a 1-1/8” auger bit:

• Drill into the tree at the marked location
• Maintain the 15–20 degree downward angle throughout drilling 

Drill deep enough to fully accommodate the lag screw and allow proper seating of the bracket collar.

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Step 5: Prepare the Collar Seat

In some hardwood species, the installer may need to enlarge the entrance of the hole slightly to allow the extended collar of the Universal Suspension Bracket to seat properly into the tree. 

To do this:

• Use the 1-5/8” auger bit to widen only the entrance portion of the hole
• Drill just deep enough to accommodate the collar section

This prevents excessive resistance during installation and reduces the risk of damaging the lag bolt threads.

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Step 6: Install the Universal Suspension Bracket

Insert the Universal Suspension Bracket into the drilled hole.

Tighten the lag bolt until:

• The extended collar is fully embedded into the tree
• The mounting bracket sits tightly against the bark
• The bracket may even press slightly into the bark surface 

A properly seated bracket improves stability and reduces unwanted movement under load.

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Step 7: Attach the Suspension Components

Once the USB is fully installed:

1. Attach the turnbuckle to the bracket
2. Connect the suspension cable
3. Attach the shackle to the TISS support end 

Double-check:

• Shackle pins are fully tightened
• Cable eyes are seated properly
• Turnbuckle threads are fully engaged

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Step 8: Tension the Suspension System

Adjust the turnbuckle until:

• Slack is removed from the system
• The cable begins carrying load evenly
• The supported structure feels stable and properly aligned

Avoid over-tensioning the system, especially during initial installation.

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Installation Tips & Best Practices

Maintain Proper Drilling Angles

Always drill the suspension anchor hole at a slight downward angle. This improves load distribution and holding power over time. 

Fully Seat the USB Collar

The extended collar of the Universal Suspension Bracket is designed to embed fully into the tree for maximum stability. 

If needed, slightly enlarge the entrance of the hole using the larger auger bit to ensure proper seating.

Protect Powder-Coated Components

Treehouse Supplies hardware is powder coated for long-term corrosion resistance. Avoid using tools that may damage the finish during installation.

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Final Thoughts

TISS™ Suspension Anchors provide a flexible and highly adjustable method for supporting treehouse platforms, stabilizing structures, and distributing loads safely throughout a tree-supported system.

When properly installed, the Universal Suspension Bracket and suspension assembly become an integral part of a long-lasting, tree-friendly support solution designed to grow with the structure over time.

For decades, our professional-grade treehouse hardware and support systems have created and extended the lives of thousands of treehouses around the world.