Concrete Window Sill Online

The concrete window sill is the "unsung hero" of building construction, acting as a functional backbone that ensures structural stability and moisture control.

A high-performance concrete sill uses a carefully proportioned mix: concrete window sill

Concrete is low-maintenance, but it is not "no maintenance." The concrete window sill is the "unsung hero"

When properly manufactured and installed, a concrete sill can last as long as the building itself. Types of Concrete Window Sills concrete window sill

Concrete sills offer several practical and aesthetic advantages over other materials like uPVC or wood:

| Component | Proportion (by mass) | Function | |-----------|----------------------|----------| | Portland cement (Type I/II or V for sulfate resistance) | 1 part | Binder | | Well-graded fine aggregate (sand) | 2–2.5 parts | Packing, finishability | | Coarse aggregate (max size 10 mm) | 1.5–2 parts | Reduce shrinkage, increase modulus | | Water | 0.35–0.45 w/c ratio | Hydration, workability | | Air-entraining admixture | 4–7% air content | Freeze-thaw resistance | | Water-reducing admixture | As required | Lower w/c, higher strength | | Polypropylene or steel micro-fibers | 0.5–1.0 kg/m³ | Crack control |