Floor: slab vs beams vs monolith

Span and load → type and approximate cost

Parameters

Span, m

Area, m²

Precast hollow-core slabs: spans to ~6.3m, fast but needs a crane and load-bearing walls. Monolithic slab: any shape, ~200mm for 4–5m spans, pricier and slower (formwork+rebar+28 days). Timber beams: spans to ~4.5m, light and fast, limited load. Timber beam rule of thumb: depth ≈ span/20.

Solution

Precast slabs 72 000 грн

crane needed900 грн/м²

Monolith 200mm 112 000 грн

16.0 m³ concrete1400 грн/м²

Timber beams ✗56 000 грн

span >4.5m — props/glulam700 грн/м²