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That gap acts as a chimney: cooler air is drawn in along the lower edge, warms as it passes the panels, rises, and leaves along the top. The flow runs whenever the panels are warmer than the surrounding air, and breeze across the roof strengthens it. The gap should follow the mounting manufacturer's installation manual, which is also the basis of the product warranty." } }, { "@type": "Question", "name": "How much annual output does an in-roof array give up compared with on-roof?", "acceptedAnswer": { "@type": "Answer", "text": "A few percent across a year is a realistic scale, and the exact figure depends on the roof. The difference is widest on hot, still, cloudless days, and it narrows in cool, breezy or overcast weather, which accounts for a large share of British generation. The loss is permanent, because it comes from the construction rather than a setting that can be adjusted later. A module with a better temperature coefficient loses less power for each degree its cells rise above the 25°C test condition, which softens the penalty. Ask whether the yield estimate distinguishes a flush array from a ventilated one." } }, { "@type": "Question", "name": "When is roof-integrated solar still worth choosing?", "acceptedAnswer": { "@type": "Answer", "text": "It can be the better choice if you accept a small, permanent output cost in exchange for the finish. On a new build or a full re-roof, integrated panels replace roof covering rather than being added over a finished roof, which changes the materials and labour involved. A flush array is also a fair choice on a prominent elevation, or where the look of the roofline matters to you. Ask whether the tray or flashing system includes designed ventilation channels, and ask for the manufacturer's performance information rather than a verbal assurance. 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Ask for both options to be priced on the same panels and inverter, with the yield estimate reflecting each mounting method." } } ], "about": { "@id": "https://kilowatts.uk/blog/in-roof-vs-on-roof-solar-the-gap-behind-the-panels/#content" } }, { "@type": "WebPage", "@id": "https://kilowatts.uk/blog/in-roof-vs-on-roof-solar-the-gap-behind-the-panels/#webpage", "url": "https://kilowatts.uk/blog/in-roof-vs-on-roof-solar-the-gap-behind-the-panels/", "encoding": [ { "@type": "MediaObject", "encodingFormat": "text/markdown", "contentUrl": "https://kilowatts.uk/blog/in-roof-vs-on-roof-solar-the-gap-behind-the-panels.md" }, { "@type": "MediaObject", "encodingFormat": "application/ld+json", "contentUrl": "https://kilowatts.uk/blog/in-roof-vs-on-roof-solar-the-gap-behind-the-panels.schema" } ], "name": "In-Roof vs On-Roof Solar: What The Air Gap Actually Does", "headline": "In-Roof vs On-Roof Solar: What The Air Gap Actually Does", "description": "Roof-integrated solar looks flusher but runs warmer. 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