Introduction
This manual provides detailed instructions for the assembly, operation, and maintenance of your Zinus SmartBase Heavy Duty 18-Inch Mattress Foundation. This foundation is designed to provide robust support for your mattress without the need for a traditional box spring, offering significant underbed storage space and tool-free assembly.

Image: The Zinus SmartBase Heavy Duty 18-Inch Mattress Foundation in Twin XL size, shown with a mattress, pillow, and blue blanket, highlighting the underbed storage space.
Safety Information
Please read and follow all safety instructions carefully to prevent injury or damage to the product.
- Be cautious around the frame to avoid tripping on the legs.
- Do not exceed the maximum weight limit. For Twin XL, the maximum weight capacity is 1500 lbs.
- Follow the assembly instructions carefully to ensure stability and prevent collapse.
- Ensure all connections are securely fastened before use.

Image: A diagram illustrating the recessed leg design of the SmartBase, with an arrow indicating how the leg is set back to prevent accidental toe stubbing.
Setup and Assembly
The Zinus SmartBase is designed for quick, tool-free assembly. It ships in one box and requires minimal effort to set up.
- Unpack the contents from the box. The frame consists of two rectangular pieces.
- Place each folded frame piece on the floor in the desired location.
- Carefully unfold each frame piece, extending the legs outwards until they lock into place. Ensure all legs are fully extended and stable.
- Connect the two frame pieces using the provided bolts and wing nuts. Securely tighten these connections to ensure the frame is rigid and stable.
- Once assembled, place your mattress directly onto the metal platform. A box spring is not required.

Image: A graphic demonstrating the 'one-touch assembly' of the SmartBase, showing the legs unfolding and locking into position without tools.
Assembly Video
Video: An official Zinus video demonstrating the zero-assembly process of the SmartBase Mattress Foundation, showing how easily it unfolds and locks into place.
Operating Instructions
The SmartBase foundation provides a stable and supportive platform for your mattress, eliminating the need for a box spring.
- Mattress Placement: Place your latex, memory foam, or spring mattress directly onto the metal grid surface. The heavy gauge steel wires are designed to provide optimal support.
- Underbed Storage: Utilize the 17 inches of clearance beneath the frame for convenient storage. This space is ideal for bins, boxes, or other items, helping to maximize room utility.
- Weight Capacity: The Twin XL size supports a maximum weight capacity of 1500 lbs. Ensure this limit is not exceeded to maintain structural integrity.
- Floor Protection: The legs are equipped with plastic caps to protect your flooring from scratches and damage.

Image: A close-up view of the Zinus SmartBase showing 17 inches of underbed clearance, with two woven storage baskets placed underneath.

Image: A detailed view of the Zinus SmartBase frame joints, highlighting its design for silent operation, with a 'no sound' icon.
Product Overview Video
Video: An official Zinus video titled 'Tales from the Box: SmartBase', showcasing the features and benefits of the SmartBase foundation.
Maintenance
To ensure the longevity and optimal performance of your Zinus SmartBase, follow these simple maintenance guidelines:
- Cleaning: Wipe the metal frame with a dry cloth as needed to remove dust and debris. Avoid using harsh chemicals or abrasive cleaners, which may damage the finish.
- Regular Inspection: Periodically check all bolts and connections to ensure they remain tight and secure. Retighten if necessary.
- Relocation: If moving the foundation, it is recommended to fold it back into its compact form to prevent damage during transport.
Troubleshooting
If you encounter any issues with your SmartBase foundation, refer to the following common solutions:
- Squeaking Noises: If the frame produces squeaking sounds, check all connection points and ensure they are securely tightened. The frame is engineered for silent operation, so loose connections are the most common cause.
- Instability: If the frame feels unstable, verify that all legs are fully extended and locked into place, and that the two frame halves are properly bolted together. Ensure the foundation is placed on a flat, even surface.
- Mattress Sliding: While the frame is designed to minimize mattress movement, some mattresses may still shift. Consider placing a non-slip pad between the mattress and the frame if sliding occurs.
Specifications
| Model Number | OLB-SB13-18TXL |
| Size | Twin XL |
| Material | Alloy Steel |
| Product Dimensions (L x W x H) | 80" x 39" x 18" |
| Style | Heavy Duty (18") |
| Color | Black |
| Maximum Weight Recommendation | 1500 lbs |
| Ground to Item Distance | 17 Inches |
| Special Features | Durable, No Box Spring Needed, Underbed Storage |
| Included Components | Foundation, Installation Manual, Legs, Slat |
Warranty and Support
Your Zinus SmartBase Heavy Duty 18-Inch Mattress Foundation comes with a worry-free 5-year limited warranty.
For warranty claims, technical assistance, or any product-related inquiries, please contact Zinus customer support through their official website or the retailer where the product was purchased.
For more information, visit the official Zinus Store.