Exterior Shade Screens | Zip, Cable-Guided, and Magnatrack Compared
Exterior shade screens stop solar heat and glare before they reach your glass, making them dramatically more effective than interior blinds. This guide explains the three main track types we install (zip, cable-guided, Magnatrack), how they differ, and where each is the right fit.
Last reviewed: 2026-04-14 · Five Eight Twelve Technical Team
Why exterior screens beat interior shades for heat
Once sunlight passes through your window, most of its heat is already inside the building. Interior blinds can block the visible light, but the radiant heat is already behind the glass. Exterior shade screens block solar radiation before it hits the glass, typically stopping 80 to 95% of solar heat gain, compared to around 30% for interior shades.
For BC homes with large west- or south-facing glazing, this is the single most effective upgrade for summer comfort short of replacing the glazing itself.
The three track systems explained
All three systems use a motorized fabric roller at the top and a track or guide on each side to control the fabric. The difference is in how the side guidance works, which drives performance and cost:
- Cable-guided: the fabric's side edges slide along taut stainless-steel cables. Simplest, most economical, lowest wind resistance. Suitable for modest openings with mild wind exposure.
- Zip screens: the fabric's side edges have a stitched zip bead that locks into a side track. Sealed on all four sides when extended; excellent wind resistance; keeps insects out. The workhorse system for residential and commercial patios.
- Magnatrack: a magnetic track system (by Progressive Screens) that lets the fabric detach and re-engage under high wind without tearing, then automatically realign. Exceptional wind handling and useful across wide spans.
Wind resistance comparison
Wind ratings vary by manufacturer and size, but as a general orientation:
- Cable-guided: typically good up to mild-moderate winds; fabric can flap or be pulled from the cable at higher speeds.
- Zip screens: quality systems are rated to 80 to 130 km/h depending on width and model; the zip-track edge holds firmly.
- Magnatrack: engineered for very high wind scenarios; the magnetic release is a safety feature that prevents damage.
Light, view, and insect control
Exterior screen fabrics come in openness factors from 1% (near-blackout) to 14%+ (preserves maximum view). An approximate 3 to 5% openness is the sweet spot for most BC installations: significant heat and glare reduction while still maintaining view through the fabric.
Zip screens fully seal the opening (left, right, top, bottom), which makes them uniquely effective at excluding insects, a significant benefit for summer patios. Cable-guided and Magnatrack systems are less sealed on the sides, so insect control varies.
When to choose each
A quick decision framework:
- Tight budget, moderate exposure, no insect concern: cable-guided
- Residential or commercial patio, insect control needed, any wind: zip screen (the right choice for 70%+ of BC projects)
- Very wide spans, high-wind exposure (oceanfront, hilltop, high-rise), or frequent extreme weather: Magnatrack
Frequently Asked Questions
Can I install an exterior shade screen over an existing window?
Yes, exterior shade screens are typically surface-mounted to the wall or overhang above the window and do not require modification of the window itself. Mounting depth, structural attachment, and clearance for the headbox do need to be assessed on site.
How much does an exterior shade screen cost?
Rough orientation for motorized BC installations: cable-guided screens approximately $2,500 to $5,000 per opening; zip screens $3,500 to $8,000 per opening; Magnatrack $5,000 to $12,000+ per opening. Final pricing depends on size, fabric, motor, and automation.
Are exterior shade screens better than tinted windows?
For heat reduction, yes: an exterior screen blocks solar energy before it reaches the glass, so even a lightly tinted window paired with an exterior screen outperforms a heavily tinted window alone. Exterior screens are also adjustable and retractable, so you keep full view and daylight when the sun isn't an issue.