kattopintaalalle

Kattopinta-ala, meaning roof surface area in Finnish, refers to the total surface area of a building’s roof. The form kattopintaalalle is the allative case of the noun, used to indicate direction toward or applicability to the roof surface, for example in technical specifications or cost estimates. Phrases such as kattopinta-alalle asetetut vaatimukset illustrate requirements intended for the roof surface.

In practice, kattopinta-ala is a key input in planning and calculations. It determines the quantity of roofing materials, insulation, coatings, and weatherproofing needed, and it is also used in assessments of loads, thermal performance, and energy efficiency. The metric is typically expressed in square meters.

Measurement and estimation: The roof area is usually derived from architectural plans or measured on site. For pitched roofs, the actual roofing surface is larger than the building’s plan footprint because of slope, so calculations may involve summing the areas of all roof planes and including overhangs and openings. For flat roofs, the plan area and the roof area are closer, though features like skylights or mechanical equipment may require adjustments.

See also: kattopinta-ala, rakennusfysiikka, talotekniikka.