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Ebbe Subfloor Lowering Kit
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At a Glance
Quick Decision Guide
Coverage
Up to 24 sq ft
Application
Curbless shower recess
Joists
I-joists and dimensional
Maximum Spacing
36" on center
Design Load
40 PSF live, 20 PSF dead
Deflection
L/360
Bracket Capacity
Up to 600 lbs each
Included Brackets
15 joist, 6 wall
Why Choose This Product
Key Benefits
Curbless Shower Preparation
Lowers the subfloor between joists to create a low- or no-threshold shower entry.
Up to 24 Sq Ft Coverage
Recesses a substantial shower floor area with one coordinated kit.
I-Joist Compatibility
Top-mounted brackets avoid fastening the support frame through the I-joist web.
No Joist Penetrations
Helps eliminate joist penetrations and the need for web stiffeners.
Engineered Floor Support
Achieves L/360 under the listed design loads when brackets follow the required spacing.
High Bracket Capacity
Each bracket supports up to 600 lbs when installed according to Ebbe requirements.
Adaptable Wall Brackets
Wall brackets can be adjusted for use at joist locations when required by the framing layout.
Included Installation Hardware
Supplies the brackets, screws, and joist hanger nails needed to build the support system.
Product Information
Product Details
About This Product
Ebbe Recess Installation Kit for Curbless Showers
Ebbe Subfloor Lowering Kit recesses the subfloor between joists to create space for a low- or no-threshold shower floor. Designed for barrier-free and curbless shower layouts, it helps installers prepare an accessible entry while maintaining a clean transition into the shower area.
Top-Mounted Support for I-Joists
The bracket system sits on top of I-joists rather than requiring the support lumber to be fastened through the joist web. This helps avoid joist penetrations and web stiffeners. Compatibility with dimensional lumber joists provides additional flexibility across common floor-framing layouts.
Engineered Support for the Recessed Floor
One kit lowers up to 24 sq ft and uses joist and wall brackets to support a user-supplied 2x4 frame and subfloor. At the specified maximum 36" on-center spacing, the system achieves L/360 under the listed live and dead loads. Each bracket supports up to 600 lbs.
Adaptable Hardware for Jobsite Framing
Included brackets, screws, and joist hanger nails keep the primary installation hardware together in one package. Wall brackets can be adapted for use at joist locations, while the support lumber can be sized so the recessed subfloor finishes flush with the joist tops.
Specifications
Brand
Ebbe
Part Number
E116
UPC
856761005958
Product Type
Subfloor lowering kit
Maximum Coverage
Up to 24 sq ft
Application
Barrier-free and curbless shower floors
Joist Compatibility
I-joists and dimensional joists
Maximum Bracket Spacing
36" on center
Design Deflection
L/360 at listed loads
Design Loads
40 PSF live, 20 PSF dead
Bracket Capacity
Up to 600 lbs each
Joist Brackets
15
Wall Brackets
6
Wood Screws
81 at 1-5/8"
Joist Hanger Nails
36 at 1-1/2"
Required Lumber
User-supplied 2x4
Recommended Lumber
Structural grade #2 or better Douglas Fir, Larch, or Pine
Subfloor Material
Not included
Adhesive
Subfloor adhesive recommended
Product Resources
Documentation & Downloads
Common Questions
Frequently Asked Questions
What is the Ebbe Subfloor Lowering Kit used for?
The kit lowers the subfloor between joists to create room for a recessed shower floor. This supports barrier-free and curbless entries with lower thresholds, helping accommodate wheelchair access when the complete shower assembly follows Ebbe instructions and applicable building requirements.
How much floor area can one kit recess?
One kit recesses up to 24 sq ft of subfloor. Projects larger than 24 sq ft require additional kits, and the layout must account for the joist configuration, bracket locations, and maximum 36" on-center spacing specified for the system.
What components are included with the kit?
The kit includes 15 joist brackets, six wall brackets, 81 1-5/8" wood screws, and 36 1-1/2" joist hanger nails. The installer supplies the 2x4 support lumber, subfloor panels, subfloor adhesive, and other project-specific framing materials.
Can the floor lowering kit be used with I-joists?
Yes. The system is designed for I-joists and can also be used with dimensional lumber joists. On I-joists, the brackets mount from the top instead of requiring the support frame to attach through the joist web, helping avoid penetrations and web stiffeners.
What bracket spacing and structural performance are specified?
Brackets must be spaced no more than 36" on center to achieve the stated L/360 performance under a 40 PSF live load and 20 PSF dead load. Each bracket supports up to 600 lbs when the system is installed according to Ebbe requirements.
What lumber is required for the recessed support frame?
The installer supplies the 2x4 lumber used to form the recessed support frame. Ebbe recommends structural grade #2 or better Douglas Fir, Larch, or Pine. Subfloor adhesive is recommended at the hanger seats, and the framing should follow applicable building requirements.
Can the system accommodate different framing conditions?
Wall brackets can be bent or adapted for use where the framing layout requires them at joist locations. If the existing subfloor is thicker, the 2x4 support lumber can be trimmed so the new subfloor finishes flush with the top of the joists.
Does this kit make a finished shower ADA compliant?
The kit helps create the lowered floor needed for a barrier-free or wheelchair-accessible shower, but it does not make the finished shower ADA compliant by itself. Applicable requirements may also govern shower dimensions, threshold height, clearances, controls, seating, and accessories.