How to Install TDBU Cellular Shades: Step-by-Step Guide

Gray cordless cellular honeycomb shades installed on three kitchen windows, showing clean inside mount installation with natural light filtering through the fabric

Installing TDBU cellular shades is a straightforward DIY project that takes under 15 minutes per window using only a basic screwdriver — mount the brackets, snap in the headrail, and test both rails for independent operation.

Installing Top Down Bottom Up cellular shades is a straightforward DIY project that most homeowners complete in under 15 minutes per window. You do not need professional installation, and you do not need specialized tools. A basic screwdriver is all you need for a standard inside or outside mount installation.

This guide walks through the complete process — from measuring and choosing your mount type to hanging the shade and making your first adjustments. Not sure if TDBU is the right choice for your windows? Read our TDBU vs. Standard Cellular Shades guide before ordering. And if you haven't measured yet, start with our step-by-step window measuring guide — accurate measurements are the most important step before installation.

What Comes in the Box

Every UAM Blinds TDBU shade ships with the assembled shade, mounting brackets, screws, and an installation guide — confirm all components are present before starting installation.

Every UAM Blinds TDBU cellular shade ships with everything you need for installation. Before you start, confirm you have the following components.

The shade itself — the cellular fabric with the top rail and bottom rail already attached. Both rails are part of the assembled shade. The headrail sits at the very top of the shade and contains the mechanism that allows independent operation of both rails.

Mounting brackets — typically two brackets for standard window widths, with additional brackets included for wider shades. The brackets are what attach to the window frame or surrounding wall and hold the headrail in place.

Mounting screws — included for both inside and outside mount installation. The screw size is matched to the bracket design.

An installation guide — included with every order. The guide contains specific instructions for your shade's dimensions and mounting configuration.

If anything is missing from your order, contact us at support@uamblinds.com before attempting installation.

Step One: Choose Your Mount Type

Inside mount gives a clean, built-in look with brackets inside the window recess; outside mount covers the full frame and provides better light blockage — decide before picking up a screwdriver, as it determines all bracket positions.

Before you pick up a screwdriver, decide whether you're doing an inside mount or an outside mount installation. This is the most important decision in the installation process because it affects how you position the brackets and where you take your measurements.

Inside mount means the shade sits inside the window recess, flush with or slightly recessed behind the window frame. The brackets attach to the interior surfaces of the window frame. Inside mount gives a clean, built-in appearance and is the more common choice for windows with decorative trim you want to showcase.

Outside mount means the shade is installed on the wall or trim surface surrounding the window, covering the frame entirely. Outside mount is better for windows where you want maximum light blockage — by extending beyond the frame on all sides, the shade eliminates the small gaps that inside mount installations can leave at the edges.

For TDBU shades specifically, outside mount is worth considering if you plan to use the blackout configuration frequently, as it provides a more complete light seal.

Step Two: Mark Your Bracket Positions

Hold each bracket in position, use a level to confirm it's straight, and mark all screw positions with a pencil before drilling any holes — a bracket installed off-level will cause the shade to hang at a visible angle.

With your mount type decided, hold one bracket up to the installation surface and mark the screw positions with a pencil. Use a level to confirm the bracket is straight before marking — a bracket installed slightly off-level will cause the shade to hang at an angle.

For inside mount, position the first bracket approximately two inches from the left side of the window frame opening. Position the second bracket approximately two inches from the right side. If your shade is wider than 48 inches, position any additional brackets evenly spaced between the two end brackets.

For outside mount, position the brackets so that the headrail will sit at your desired height above the window opening — typically two to four inches above the frame — and centered over the window. The brackets should extend at least one inch beyond the window frame on each side to ensure the shade covers the full opening.

Mark all bracket positions before drilling any holes. Step back and confirm the marks look level and symmetrical before proceeding.

Step Three: Install the Brackets

Drive screws firmly but not overtight; for outside mount on drywall without a stud, use wall anchors — then confirm all brackets are at exactly the same height before hanging the shade.

For most window frames and wall surfaces, the included screws drive directly into the material without pre-drilling. Hold the bracket against the surface, align it with your pencil marks, and drive the screws through the bracket holes into the frame or wall.

If you're installing into drywall without a stud behind it — which may happen with outside mount installations on wider windows — use the wall anchors if they were included, or purchase appropriate drywall anchors separately. A TDBU cellular shade is not heavy, but a bracket that pulls out of drywall will cause the shade to fall.

Drive the screws firmly but do not overtighten. Overtightening can strip the screw hole in softer frame materials or crack the bracket. The bracket should sit flush against the surface without any movement when you test it by hand.

Repeat for all brackets. Once all brackets are installed, hold a level across the tops of the brackets to confirm they are at the same height. A difference of even a few millimeters will cause the shade to hang visibly crooked.

Step Four: Hang the Shade

Hold the headrail facing the window, press it firmly into the brackets until it clicks into the locking tab, then test by pulling gently on the bottom rail to confirm it's secure.

With all brackets installed and confirmed level, you're ready to hang the shade.

Hold the shade up to the brackets with the headrail facing the window. The headrail is the uppermost component — it contains the mechanism that allows both rails to operate independently. Position the headrail so it aligns with the open channel of the brackets.

Press the headrail firmly into the brackets until you hear or feel it click into place. On most bracket designs, there is a locking tab that secures the headrail once it's seated. Confirm the locking tab is engaged before releasing the shade.

With the shade hanging, gently pull on the bottom rail to test that the headrail is secure in the brackets. The shade should stay in place without any movement or wobble at the brackets.

Step Five: Test the Operation

Test both rails independently — each should move smoothly and hold position at any point without springing back; if either rail doesn't hold, contact support before using the shade further.

With the shade installed, test both rails before making any final adjustments.

To lower the bottom rail, grasp it with both hands and gently pull downward. Release it at any position and it should hold in place. To raise the bottom rail, push it upward with both hands. The shade should move smoothly and hold at any position without springing back.

To lower the top rail, grasp the top rail — which runs along the top edge of the fabric, just below the headrail — and gently pull it downward. On a TDBU shade, the top rail moves independently of the bottom rail. Lower it partway and release to confirm it holds position. To raise the top rail back up, push it upward toward the headrail.

Both rails should move smoothly and hold position wherever you place them. If either rail moves on its own or does not hold position, contact us before using the shade further.

Step Six: Make Your First Adjustments

For living rooms, lower the top rail to midpoint for indirect light with privacy below; for bedrooms, start fully closed and experiment with the top rail for morning light; for home offices, adjust the top rail to block direct screen glare.

With both rails confirmed working, position the shade for your first real use.

For a street-facing living room window, try lowering the top rail to approximately the midpoint of the window while leaving the bottom rail in the lowered position. This is the configuration that admits indirect light from the upper window while maintaining privacy coverage at the lower portion.

For a bedroom window, start with both rails in the fully lowered position — bottom rail at the windowsill, top rail at the headrail — for complete coverage. This is your nighttime sleeping configuration. In the morning, experiment with lowering the top rail slightly to admit a gentle strip of light from above without raising the entire shade. For more bedroom-specific TDBU tips, see our guide on TDBU blinds for bedrooms.

For a home office window, lower the top rail to the point where direct sun no longer hits your screen, while keeping the bottom rail raised for ambient light. Adjust the top rail as the sun moves through the day.

Common Installation Questions

What if my brackets don't feel secure after installation?
If a bracket moves or feels loose after the screws are fully driven, the screws may not be biting into solid material behind the surface. Remove the screws, fill the holes with toothpicks and wood glue, allow to dry, then re-drive the screws. Alternatively, for outside mount installations on drywall, use wall anchors rated for at least five pounds.

What if the shade hangs slightly crooked after installation?
A visible tilt usually means one bracket is slightly higher than the other. Remove the headrail from the brackets. Loosen the screws on the lower bracket, adjust it upward to match the height of the higher bracket, and re-tighten. Hang the shade again and check the level.

What if the top rail or bottom rail doesn't hold position?
Contact us at support@uamblinds.com with your order number. A rail that does not hold position is a manufacturing defect covered under our warranty, and we will send a replacement shade.

Can I re-install the shade in a different location later?
Yes. The headrail releases from the brackets by pressing the locking tab and lifting the rail out. The brackets can be removed from the wall by unscrewing them. The shade and brackets can be re-installed in a new location using the same process described in this guide.

A Note on Tension Mount Installation

Tension mount shades use a spring-loaded headrail that compresses to fit inside the window frame with no brackets or screws — compress, position at desired height, and release; requires a minimum 1.5-inch flat frame depth.

If you ordered a no-drill tension mount version of a UAM Blinds cellular shade, the installation process is different from the bracket process described above.

Tension mount shades use a spring-loaded headrail that compresses slightly to fit inside the window frame, then expands to hold the shade in place by pressure against the interior surfaces of the frame. No brackets, no screws, and no holes in any surface.

To install a tension mount shade, compress the headrail slightly by pushing the ends inward, position it inside the window opening at your desired height, and release. The spring tension holds the shade firmly in place. Both rails operate the same way as a bracket-mounted shade.

Tension mount installation works best for windows with a flat, even interior frame surface and a minimum frame depth of 1.5 inches.

UAM Blinds TDBU cellular shades are available in both standard bracket mount and tension mount configurations. All orders include the installation hardware appropriate for the mount type you selected.

Questions about installation? Contact us at support@uamblinds.com — we are happy to help before, during, or after installation.

Further Reading