1. Mark where the screen will sit
For an inside mount, measure between the proposed fixing faces of the posts and under the header that will carry the cassette. For a face mount, record the clear opening and the flat fixing area available above and on both sides. Note any base plates, gutters, lights or brackets crossing the proposed track line. Measure each bay separately, even when they look identical.
2. Record the opening measurements
| Record | Where to measure | What it helps check |
|---|---|---|
| Three widths | Top, middle and bottom, between the proposed track fixing faces. | Whether the posts taper or bow. |
| Three heights | Left, centre and right, from the proposed cassette fixing surface to the finished floor or sill. | Whether floor slope or a beam offset affects the bottom gap. |
| Two diagonals | Corner to opposite corner in both directions, in the same plane as the widths and heights. | Whether the opening needs a closer check for squareness. |
| Fixings and clearance | Available flat face width and depth at the header and both posts, and the proposed power entry. | Whether the cassette and guides can be fixed and serviced without blocking drainage or access. |
Label left and right as viewed from one stated side. If the decking or paving is unfinished, mark its planned finished level. Keep all the raw readings. Deductions depend on the cassette and tracks, so confirm the final order dimensions on the supplier’s drawing.
3. Send one labelled checklist per opening
- Opening ID and project location, with the units used for every reading.
- Width at top, middle and bottom; height at left, centre and right; both diagonals.
- One full photo and close-ups of the header, both post faces and the floor or sill. Mark the proposed track and cassette positions.
- Mounting preference, fabric preference, power location and obstructions. Flag exposed sides so the operating limits for the proposed configuration can be reviewed.
For a new pergola, mark the screened sides before approving the frame layout. For a retrofit, have your installer verify the condition of the existing frame and the proposed fixing surfaces.
Compare options and request a quote
See outdoor motorised ZIP screen options and compare screen fabrics for glare and privacy. Request a ZIP screen quote with your opening sizes and delivery market, then share labelled photos or drawings by email or WhatsApp.