Long spans,
light walls.

Prestressed hollow-core slabs on AAC wall panels: longer rooms, the same light, fire-rated, insulated walls.

System H · Hollow-core & AAC wallsISO 9001 · ISO 14001 · ISO 45001 · ICV certified

00Mission

Hollow-core where the span asks for it.

System H pairs reinforced AAC wall panels with prestressed hollow-core slabs: where rooms are wider than 6 m, or floor loads are higher, the hollow-core slab carries the span and the AAC walls carry the slab. Lintels and parapets stay in AAC.

6 m+Spans beyond AAC slabs

550kg/m³ wall density

4 hrFire rating at 100 mm

1Raft foundation under it all

01System H

Hollow-core & AAC walls.

AAC wall panels fixed together with hollow-core slabs on a raft foundation: AAC lintels over the openings, AAC parapets on the roof, hollow-core and AAC slabs where each performs best.

Elements
Foundation	RC raft; services fixed before casting
Wall panels	Reinforced AAC, 150 to 300 mm, load-bearing
Lintels	AAC, cut to the opening
Slabs	Prestressed hollow-core for long spans; AAC slabs elsewhere
Parapets	AAC panels, recessed or grooved as designed
Ring beam	RC ring beam at slab level on the AAC walls

02Technical data

The numbers
behind the system.

Values from GGI technical data sheets. Project-specific calculations, span tables, fire certificates and drawings on request.

AAC walls
Wall design load	120 kg/m² Horizontal, minimum
Density	550 kg/m³ Maximum 650
Strength	3.5 to 4.0 MPa To QCS 2010
Thermal	K 0.144 W/m·K U 0.55 at 200 mm
Sound	46 to 48 dB STC 150 to 200 mm
Fire	Minimum 4 hours At 100 mm

Slabs
Hollow-core	Spans over 6 m; higher loads Prestressed precast
AAC slab	Spans to 6 m 350 kg/m² floors; 250 kg/m² roofs
Bearing	On AAC wall panels with ring beam Detail per project

Values from GGI technical data sheets; slab design by the hollow-core supplier.

03Details