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The integrated solar guide.

Plain-English answers on building-integrated solar, written for architects, owners and roofers.

Basics

What is BIPV?

BIPV is solar replacing roofing, cladding or glazing. BAPV is building-applied solar mounted on a finished surface.

BIPV vs. rack-mounted solar

BIPV replaces roofing material. Rack-mounted solar sits above a finished roof. Compare the complete roof and electrical scope, not just the price of solar modules.

Flat and green roofs

Vertical bifacial solar, explained

Bifacial panels generate power from both faces. Upright panels facing east and west tend to produce a morning peak and a late-afternoon peak, with results shaped by roof reflectance and spacing.

Solar on green roofs

Vertical rows on raised support feet can share a roof with vegetation. Layout, plant height, structural capacity and maintenance access determine whether the combination works.

Solar for flat roofs with weight limits

A low distributed load can help on a flat roof with limited structural reserve, but it is not proof of suitability. A licensed structural engineer must confirm the roof and the project-specific loads.

Pitched roofs

Standing-seam solar roofs vs. solar shingles

Both approaches can replace roofing with a power-generating surface. Standing-seam systems use larger metal panels; solar shingles use smaller roofing-like units. Compare the whole assembly and installation plan.

Benefits of metal roofs

A standing-seam metal roof sheds weather with joined metal panels. Its durability, appearance and maintenance needs make it worth considering when a roof is being built or replaced.

Rules and money

Codes and approvals for integrated solar in the U.S.

A solar project needs building approval and, when grid-connected, utility approval. The documents and review depend on the jurisdiction, adopted code editions and exact equipment.

Incentives for integrated solar

Federal solar tax rules changed in July 2025. Residential and commercial projects now face different deadlines, while state, utility and local programs still vary.