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Exterior shade screens stop solar heat and glare before they reach your glass — 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
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 80–95% 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.
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:
Wind ratings vary by manufacturer and size, but as a general orientation:
Exterior screen fabrics come in openness factors from 1% (near-blackout) to 14%+ (preserves maximum view). An approximate 3–5% 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.
A quick decision framework:
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.
Rough orientation for motorized BC installations: cable-guided screens approximately $2,500–$5,000 per opening; zip screens $3,500–$8,000 per opening; Magnatrack $5,000–$12,000+ per opening. Final pricing depends on size, fabric, motor, and automation.
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.