Pergola frame geometry: check the opening before adjusting the screen

Measure the geometry that accessories use

An accessory fits an opening, not a photograph. The installer may need frame dimensions, diagonals, levels, post alignment and the clear dimensions at several relevant locations. Diagonal comparison can help check geometry, but it is not the only measurement and does not replace the system's instructions. Ask the supplier to identify the required checks and allowable installation conditions for the selected configuration. Do not invent one tolerance for every pergola. Keeping measurements tied to a defined reference also helps distinguish an irregular surrounding patio from an issue in the frame or accessory opening.

Do not ask a motor to overcome geometry

When a screen binds or a louver gap appears uneven, increasing force or repeatedly commanding movement does not establish the cause. The responsible installer should consider the opening, guides, components and permitted settings together. Avoid changing limits, loosening structural connections or trimming parts without an approved procedure. A control adjustment might be relevant in a particular case, but it should follow diagnosis rather than conceal an unverified installation condition. The same principle applies when adding an accessory later: confirm the existing opening before ordering a part based only on the nominal frame size.

A sloping-patio example

Imagine a patio that intentionally falls toward a drain. During installation, different people use the paving edge, a wall line and the frame drawing as their reference. The pergola looks acceptable from one viewpoint, but the proposed side opening has not been checked against a shared datum. Before fitting the screen, the installer should reconcile the references and record the required geometry. This example does not imply that the patio should be levelled or that every frame member must share one elevation. It demonstrates why the product's intended arrangement must be distinguished from surrounding surface geometry.

Retain a measured installation baseline

The handover should include the measurements required by the system and any approved deviations, tied to dated photographs and opening identifiers. That baseline helps a service team compare later symptoms with the installed condition. For a TTH enquiry involving existing supports or a retrofit opening, supply measured dimensions and identify how they were taken. If the opening changes during construction, update the information before accessory manufacture rather than expecting a standard adjustment range to absorb an unknown difference. Retain the final measurement revision so an earlier sketch does not reach another supplier later. Otherwise a subsequently ordered screen or glass component may be manufactured from information that no longer describes the opening, even though the original installation team resolved the geometry correctly.

• Use the product's required measurement points and a shared reference.
• Record opening identities, measured geometry and approved deviations.
• Investigate binding before altering controls or structural connections.