Technical specification

BubbleDeck precast concrete slabs are suitable for use in all building types especially open floor designs such as commercial, educational and institutional buildings.

Although the technology can be adjusted to suit almost any floor slab arrangement our experience - gained over more than 400 buildings completed around the world in the past decade - has shown that most building uses fall into the slab categories shown in the table.

Experience has also shown the most cost effective application of the floor technology is through semi-precast elements.

The size of the elements should be maximised to increase cost efficiency, however this is generally limited by local transport restriction.

Typical dimensions are:

Width	2.4m to 3.0m
Length	9m to 10m

The slab types given in the table can be applied over the following range of spans and strength.

Note the final design will dictate the ultimate choice of slab.

Simple site installation

Prop	1. Temporary supports	Typically 2m spacing
Place	2. Place elements	Semi-precast panels lifted into position
	3. Joint reinforcement	Loose straight splice bars and shear reinforcement across columns if needed
Pour	4. Preparation	Seal joints, clean and moisten precast concrete layer
	5. Concreting	Pour, vibrate and float
	6. Temporary works	Remove, typically after 1-2 weeks, according to specific site advice

Geometry parameters and spans

Type	Thickness [mm]	Ball Diameter [mm]	Span [m]	Mass [kg/m²]	Concrete on site [m³/m²]
BD230	230	180	7-10	413	0.12
BD280	280	225	8-12	470	0.14
BD340	340	270	9-14	550	0.18
BD390	390	315	10-16	640	0.20
BD450	450	360	11-18	730	0.25

Moment strength and span

lightweight concrete floor moment strength graph

Thermal resistance

Type	Finished Thickness [mm]	BubbleDeck Thermal Resistance [m²k/W]	Solid Slab Thermal Resistance [m²k/W]	Difference
BD230	230	0.1546	0.1111	39%
BD280	280	0.1847	0.1375	34%
BD340	340	0.2102	0.1659	27%
BD390	390	0.2325	0.1905	22%
BD450	450	0.2583	0.2205	17%