Slatted Aluminum Pergola Spacing for Filtered Sunlight

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For filtered sunlight, the slat spacing on an aluminum pergola should leave visible gaps that let daylight through while softening direct rays. The right gap depends on the height of the structure, the direction of the sun over your terrace and how much shade you want at midday. Techno Kol Uzi measures on site and drafts the spacing for each project.

What filtered sunlight means on a pergola

Filtered sunlight is light that passes through a roof but arrives broken up into patches and softened edges. Unlike a solid cover, a slatted roof keeps the space bright and pleasant while taking the harshest glare away. This suits terraces, dining areas and balconies where you want daylight without the heat of full exposure.

The effect depends on how much of the roof is open compared with how much is covered by the slats. A wider gap gives more light and more heat, while a narrow gap gives deeper shade. Choosing the right balance is the core decision in any aluminum pergola.

How slat spacing changes the amount of light

Slat spacing is the distance between one aluminum blade and the next. When the gap is small relative to the slat width, the roof casts a near-continuous shadow. When the gap is large, sunlight reaches the floor in bright stripes.

Tighter spacing: more shade, cooler floor, dimmer space below.
Wider spacing: brighter space, more sun on furniture and people.
Adjustable louvers: let you change the balance through the day and season.

For most filtered-light goals, a moderate spacing is the starting point, then refined for your site.

Orientation and sun path over your terrace

The sun moves across the sky, so a pergola that filters light well at noon may behave differently in the morning or late afternoon. A low western sun can strike almost horizontally, which means the slats will shade less than expected unless the structure is sized and angled to handle it.

Look at which way the open side of your terrace faces and where the shade is needed most. A west-facing space usually benefits from closer spacing or a tilt that blocks the low evening sun, while a north-facing space may need little more than gentle diffusion.

Height, slat width and the gap ratio

The height of the pergola affects how the light lands. A higher roof lets sunlight spread wider before it reaches the ground, so the patches become softer. A lower roof casts sharper, more defined shadows.

Slat width matters as well. Wider blades block more light for the same gap, while narrower blades let more through. The ratio between the slat width and the gap is what you actually control, and it should be planned together with the height and the orientation rather than chosen in isolation.

Planning the spacing for your site

Good spacing comes from measuring rather than guessing. At Techno Kol Uzi, the process starts with an inquiry and photos, followed by an on-site measurement that records the direction of the terrace, the surrounding walls and the height available.

From there, a drawing and written specification are prepared showing the slat width, gap and tilt. Once you approve it, the pergola is manufactured to measure in our factory on Rival Street in Tel Aviv, finished for outdoor use and installed on site.

Balancing shade, airflow and comfort

Filtered light is not only about brightness. Good spacing also allows warm air to escape and keeps the space ventilated, which makes a large difference in summer. A slatted roof that is too closed can trap heat underneath even when it blocks the sun.

Consider adjustable slats if you want flexibility across seasons. Fixed spacing is simpler and lower maintenance, while adjustable blades give you control over the light each day. Your choice should reflect how you actually use the space.

Frequently asked questions

What spacing gives the best filtered sunlight?

There is no single number that suits every terrace, because the best gap depends on height, orientation and how much shade you want. A proper on-site measurement is the reliable way to decide.

Can I change the light later with adjustable slats?

Yes, adjustable aluminum louvers let you open or close the roof to change the amount of light through the day and across seasons. They offer more control than fixed slats.

Does a slatted pergola still keep the space cool?

A slatted roof blocks much direct sun while letting warm air escape, which helps keep the space comfortable. Its cooling effect depends on the spacing and the direction the space faces.

How do I start a pergola project with Techno Kol Uzi?

Send us an inquiry with photos of your terrace, and we will arrange an on-site measurement, then prepare a drawing and written specification for your approval before production.

Common mistakes to avoid

Choosing the gap by eye from a photo, without considering the sun path, is the most common error. Ignoring airflow and making the roof too closed can trap heat underneath.

Our recommendation

Measure your terrace's sun exposure at the times you actually use it, and ask for a drawing that shows the slat width, gap and tilt before approving production.

Summary

Filtered sunlight on an aluminum pergola depends on slat spacing, height, orientation and airflow, all of which should be planned together on site.

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