Most problems with a fitted blind have one of a small number of causes, and almost all of them trace back to measurement or to the surface it is mounted against.
A Tension Mount That Creeps Down
The most common complaint with no-drill shades, and it is nearly always the frame rather than the shade.
Spring and tension mounts hold by pushing against the inside faces of a recess. That requires a firm surface. Crumbling plaster, flaking paint or a soft filler repair lets the rod slowly compress its way in.
Pressing hard on the frame before ordering tells you whether it will hold. Where it gives, a tension mount is the wrong choice for that window regardless of the product.
Too Wide or Too Narrow
- Too wide: the opening was measured at its widest point rather than its narrowest
- Too narrow: the factory deduction was applied twice, once by you and once by the maker
- Fits at the top and jams at the bottom: the frame is out of square
- Gaps at one side only: same cause, and usually acceptable visually
Measuring at top, middle and bottom and ordering off the narrowest is what prevents all four. Fit tools that apply the deduction for you, of the kind at lazblinds.net, remove the double-deduction error specifically.
Not Enough Recess Depth
The shade protrudes past the frame, looks wrong and may foul the window when it opens.
There is no fix short of changing to an outside mount or curtains. Checking depth before ordering is the only remedy, and it is the measurement most often skipped.
An Adhesive Mount That Lets Go
Almost always one of three things: the surface was not cleaned with alcohol, the strip was loaded before curing, or the paint underneath was too fresh.
Fresh paint is the one people do not anticipate. Paint cures for weeks after it feels dry, and adhesive on it takes the paint with it.
A Shade That Will Not Stay Where It Is Put
Cordless mechanisms hold by friction or by a spring balance. Where a shade drifts down, the mechanism is either worn or the shade is heavier than the design allows, usually because it is oversized.
Some designs can be adjusted; many cannot. This is worth raising with the seller within the return window rather than living with.
Uneven Hanging
A shade that hangs visibly crooked is usually mounted level in an opening that is not level, which is extremely common.
Mounting to the frame rather than to a spirit level generally looks better, since the eye compares the shade to the window around it.
Operation Becoming Stiff
Dust and grit in a mechanism, or a shade being pulled from one side rather than centrally.
Cleaning the track or rail and operating from the centre resolves most cases. Oil-based lubricants attract dust and generally make it worse.
Before Returning It
Re-check the measurement against the product’s stated deduction, and check the frame surface. Those two account for the large majority of fitting problems.
