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Conformance to


CSA 0122-06,

CAN/CSA 086-09 

CSA 0112.9-10

CSA 0112.10-08

CSA 0141-05 (R2009)

CSA 0177-06 (2015)


Preparing for 

ANSI PR 320-2015 

Advanced technology and modern building codes are expanding the opportunities for wood in construction.

Wood products offer advantages in terms of material, construction and environmental costs.


Wood is a renewable and responsible choice that helps reduce our environmental footprint.

Guardians semi precast voided slab





 At the precast shop: 1. Radiant PEX tubing attachment to bottom reinforcing mesh (top left), 2. Placement of plastic bubble voids, lattic girders and top welded wire mesh (top right), 3. Precasting bottom deck of panels (above).


 Put structure where you need it

The goal is to produce a floor slab that can achieve longer spans with a continuous, “flat plate”  underside.  This is achieved by reducing concrete weight at the center of the slab’s section, where it is least helpful structurally.  Slabs resemble many “I” beam shapes stitched together when viewed in section cut in either orthogonal direction.  Concrete mass is concentrated at top and bottom of the section, where compressive and tensile bending stresses are greatest.  Mass at the center (or “neutral axis”) of a conventional flat plate slab is essentially free of bending stress, and voided slabs offset much of this “dead weight” with cast-in hollow plastic spheres or “bubbles.”  A “cage” of reinforcing bars help to keep the spheres in place during the forming process, and also help stitch the slab’s top and bottom together.



Build More With Less

Stay in Place Form that is prefabricated as a semi pre-cast slab,  typically 8-10 feet wide x 40 feet long.

Hollow plastic balls are inserted into the slab and held in place by reinforcing steel embedded into 3" concrete. The end result eliminates the use of concrete that has little carrying effect while maintaining the two-way span (biaxial) strength.


Reduced Overall Cost

eliminates up to 35% of the structural concrete. When coupled with the reduced floor thickness and facade, smaller foundations and columns, construction costs can be reduced by as much as 10%.


Faster Construction

With virtually no formwork, no downturn beams or drop heads, and fast coverage of typically 320ft2 per panel, means floor cycles up to 20% faster than traditional construction methods. Regardless of project size, shape or complexity; simply shore, place, and pour to quickly install concrete decks.


Lower Risk

Off-site manufacturing, fewer vehicle trips and crane lifts as well as simple installation all combine to minimize operating risks, as well as lower health & safety risks. 


LEED Compatible

system offers a wide range of advantages in building design and during construction. There are a number of green attributes including; reduction in total construction materials, use of recycled materials, lower energy consumption and reduced CO2 emissions, less transportation and crane lifts that make it more environmentally friendly than other concrete construction techniques.






Less labor on site

There are obvious advantages to performing sensitive work in a climate-controlled shop, following rigorous coordination drawings:  architectural concrete finish, placement of radiant tubing, placement of junction boxes, etc.  Less obvious is the reduction in site labor, and particularly formwork construction.  The semi precast panels arrived on site by truck and were craned directly onto shoring, followed by conduit installation and placement of additional rebar.  These panels then serve as permanent formwork for the final pour on top.  Slab edges are formed and shored with steel plate edge forms that were cast in the shop, and coordinated to accept curtain wall anchor pockets.


Shoring erected in preparation for delivery of semi precast panels. (Courtesy the Daniels Faculty. Photo by Peter MacCallum)

typically five panels per truck loadtypically five panels per truck load           

panels are picked from truck and set in placepanels are picked from truck and set in place


panel 10' x 40'panel 10' x 40'


shoring support from undersideshoring support from underside




41 Story Building


 37,000 square meters 

Torre Regione Piemonte

La Nuova Sede Unica della Regione


PiemonteTurin / Italy / 2015














34 Story Building

 Millenium Building


 Originally designed with hollow core plank, late in the design stage it was determined that BubbleDeck would allow for considerable cost and time savings.

Another consideration was the lack of storage space on the building site which is located in the heart of Rotterdam.

The floors were finished in half the time (on average 4 days instead of 8) and the number of floors was increased by 2 to 34 levels while the same overall building elevation was maintained.

The building was completed in April 2000.





























Student Residence Building, ETS
Montreal, Quebec

174,000ft2 on 11 levels

BD280 on all floors

Max span 30ft x 30ft

Completed March 2008.