Inputs
All sliders range from 1 (low) to 5 (high).Formula used
This selector builds a target openness using weighted priorities and environment modifiers, then snaps to common fabric options.
- P privacy, V view, H heat, G glare, W wind, I insects (scaled 0..1).
- S modifiers adjust for exposure, orientation, season, plants, and color.
- snap() selects the closest standard openness: 1, 3, 5, 7, 10, 12, 14.
These outputs are planning guidance. Always confirm UV and tensile specs from suppliers.
How to use this calculator
- Select sun exposure, orientation, and the season you want to optimize.
- Set slider priorities for privacy, view, heat, glare, wind, and insects.
- Submit to see a recommended openness and supporting indicators.
- Export CSV or PDF to compare locations and fabric samples.
- Validate with real fabric spec sheets and a small outdoor test.
Example data table
| Scenario | Inputs snapshot | Suggested openness | Use case |
|---|---|---|---|
| Hot west patio | Full sun, West, Summer, Privacy 4, Heat 5, Glare 5, View 2 | 3% | Strong cooling and glare control. |
| Bright garden walkway | Partial sun, South, All-season, Privacy 2, Heat 3, Glare 3, View 4 | 10% | More openness for visibility and airflow. |
| Seedling area | Full sun, East, Summer, Plants Seedlings, Wind 4, View 3 | 5% | Reduce stress while keeping light. |
| Shaded seating nook | Mostly shade, North, Winter, Privacy 3, View 4, Heat 2 | 12% | Let in more light where sun is limited. |
Examples are illustrative; your local conditions can vary.
Openness percentages and garden outcomes
Solar shade openness is the open area in the weave, expressed as a percent. Lower openness reduces glare and heat but dims the canopy and reduces airflow. Higher openness keeps visibility and breezes but allows stronger sun spots. In patios, 1–3% often feels cooler at midday, while 7–10% keeps the space brighter.
How priorities shift the recommendation
This calculator converts your privacy, view, heat, glare, wind, and insect priorities into a weighted score. When privacy and glare are set high, the target moves toward 1–5% to tighten sight lines and soften brightness. When view is set high, the target rises toward 10–14% to maintain a clearer horizon and outdoor ambience.
Exposure, orientation, and seasonal tuning
Sun exposure and orientation act as environment multipliers. West-facing areas commonly experience intense late-day glare, so the tool nudges openness down. A summer cooling focus also nudges down to reduce solar load, while a winter light focus allows higher openness to prevent a gloomy seating zone when sunlight is limited.
Plant sensitivity and microclimate control
Plant type matters because shades change leaf temperature, transpiration, and wind stress. Seedlings and tender starts usually benefit from reduced intensity and calmer air, so recommended openness stays lower. Sun-loving beds can tolerate higher openness, especially when airflow is needed to reduce humidity and foliar disease pressure.
Interpreting exports and testing in real conditions
Use the CSV to compare multiple locations, then shortlist two openness options near the recommendation. Test with fabric samples at the same time of day you will use the space, and note reflected glare from nearby walls. Always confirm UV and tensile specifications from the supplier before ordering.
For pergolas and greenhouse sidewalls, the selector supports repeatable comparisons. Run one set for morning use and another for late afternoon, then choose the lower openness if comfort diverges. If you install multiple panels, consider mixing 3% on the west and 7–10% elsewhere for balanced light and airflow, and to protect delicate foliage.
FAQs
What does openness percentage mean for shading?
Openness is the approximate open area in the fabric weave. Lower values block more sun and glare, while higher values allow more light, airflow, and view clarity. It is a planning metric, not a full performance certification.
Which openness works best for hot, bright patios?
For strong midday heat and harsh glare, many outdoor setups feel comfortable around 1–3% openness. Pair it with secure mounting and ventilation gaps. Always validate comfort with a small sample because wall reflections can change glare.
Will higher openness always improve the view?
Higher openness usually improves daytime visibility, but it can increase glare and reduce privacy. Darker fabrics often preserve view contrast better than lighter fabrics at the same openness. Balance view with your comfort priorities for the time you use the area most.
How should I choose for seedlings and tender plants?
Seedlings often benefit from tighter openness, typically 3–7%, to reduce stress from intense sun and wind. Combine the shade with gradual hardening-off schedules. Monitor leaf scorch and soil moisture, then adjust placement or openness accordingly.
Is UV blocking the same as openness?
No. Openness relates to weave gaps, while UV blocking depends on yarn, coatings, color, and tested ratings. Two fabrics with the same openness can have different UV performance. Use the calculator for targeting, then confirm lab-rated UV specs from the vendor.
How do wind and insects influence selection?
Higher wind exposure favors sturdier, tighter weaves and stronger edge finishing. Higher insect pressure favors smaller openings that reduce entry points. Ensure hardware is rated for gusts, and keep a small airflow gap to avoid trapping heat under the shade.