On-Sash Venetian Blind
On-sash Venetian blind — the rail screws to the sash's own profile. The blind turns with the sash and stays lowered in tilt position.
The Blind Bound to the Sash Itself
In an on-sash set-up the rail is screwed not to the wall or the recess but to the window sash's upper profile. The blind becomes part of the sash and turns together with it.
This structure produces a separate comfort on tilt-and-turn sashes. Even when the sash is brought to the tilt position the blind stays lowered and working; privacy is not interrupted.
What Sash-Bound Working Brings
Turning with the sash
Since the blind follows the sash, on inward-opening windows the hitting and jamming problem is not lived.
Working near the glass
Since the blind stays on the same plane as the joinery the edge light leak drops to the lowest values.
Sill freedom
The connection is on the sash profile. Sill, casing and wall surface ask for no share.
Mark-free leaving
The connection points are on the sash; the wall and the recess remain untouched.
Conditions of On-Sash Mounting
Sash form and blind weight decide the suitability. It passes four checks.
| Check | Required | Note |
|---|---|---|
| Sash profile | A flat section gripping the screw | A drip protrusion cuts the screw line |
| Blind weight | A size the sash can carry | Wide and timber slats strain the sash |
| Handle distance | The rail not touching the handle | A rail share is left on the handle side |
| Second sash | A separate rail per sash | A shared rail locks the two sashes |
The On-Sash Mounting Order
If the screw line is given right the rest is seating and testing.
- 1
The sash plane is probed
The flat section the upper profile will take a screw is found; the drip and the gasket line are left outside.
- 2
The rail is seated on the sash
The rail is fixed to the upper profile; the movement share on the handle side is preserved.
- 3
The opening test is done
The sash is brought to both side opening and tilt position; the blind must touch no obstacle in any position.
- 4
The chain is routed
The control chain is hung on a line not cutting the sash movement; if needed a chain retainer is fitted.
The Sash's Carrying Limit
Sash hinges are designed to carry their own glass weight. The blind is extra load and the limit grows with rail and slat weight; for this reason the on-sash set-up is recommended at standard aluminium sizes.
On a wide opening a single rail cannot be shared by two sashes. Each sash carries its own rail; the measurement is taken separately per sash and the products work independently.
Questions About On-Sash Venetian Blind
Does the blind fall while opening with the sash?
Does driving a screw into the sash spoil the joinery?
Is a separate blind needed per sash?
Related pages: Recess-Mounted Venetian Blind · Bracket-Mounted Venetian Blind · Venetian Blind Systems
Send the Sash Photo
Once the sash profile and the opening form are shared the on-sash suitability is finalised.
