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
precast concrete floor slabs

Geometry parameters and spans

Type Thickness
on site
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
Thermal Resistance
Solid Slab
Thermal Resistance
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%