Never gonna be seen. As long as they stop the plank moving on it bearing. That's all that matter. Time is money.

Carlo Garaygay : Yes, there are weld plates under the concrete planks which are welded to the beams, welding shown in this video as well. On the Foundation walls the rebar stubs are bent, pushed in to the cores and grouted with concrete. Also, there are rebar sections welded and grouted in between the planks from the top. The Concrete Planks are also topped & leveled with ~2" layer of concrete with radiant heating tubes .

The long edges of each plank is Tapered where the bottom edge goes right up against the adjacent plank. Each plank is pushed, slid into place after the crane cables are removed with a pry bar and mallet. Once measured, squared, then the weld plates are welded, gaps and rebar inserts are grouted.

Bar them tight. Or in some case shutter it up with board and concrete it in.

The grout was Not anything special, if recall accurately. To me it looked like a mortar mix that we buy at Home Depot. I know the Grout was porous, as water would seep through to the basement below. So I used (10+) 5 gallon pales/buckets of sealer called Hydralastic . While very expensive, ~$250/pale, Hydralastic did stop the seepage between the concrete planks. It is applied with a rigid spackle knife and can be arduous. I could have also used a hydraulic cement concrete mix that Home Depot sells(not cheap) but I didn't notice it until after Hydralastic.

​@ozdoganDS82 we used to carry a small concrete skip in our van it was a quarter meter skip was perfect 4 skips per meter usually had about 3cube every other day. I played tens of thousands of these planks and stairs and landings too. All-over the 🇬🇧

I'm the homeowner, an electrical & computer engineer and the G.C. of my own job; and Not an expert on welds. Can you help fix the welds ? The planks have 3" baring on the steel beams & foundation walls. I have additionally installed rebar staples on top of the planks under grout, in addition to rebars bent into core ends & grouted. Also most of basement partition walls and foundation walls are framed under the planks ends with 14gage steel . So I hope, if a plank was to rock out off place and fall in an 8.0 Richter earthquake, the framing may hold it in place . We'll see, check with me in a few thousand years :)

Pls. see my other KZfaq videos. Search "House Construction, Lawrenceville, NJ" . Replied: Mar.9, 2017

Cheaper than having carpenters and steel fixers and gang concreting it. Much faster precast. Time is money

I would have to look it up, it's been 5 years. I would guess ~40lbs/ft2 ?! These were mostly typical 8" planks, considering an empty core, the unit area weight should be about same from other similar manufacturers; which you may be able to find online.

Good Observation; the ends of each core were grouted, concrete plugged by the manufacturer; I too had expected the middle planks' ends to be open, plugged only, on the wall ends.

The ends are solid but the rest is hollow. About 500 mm each end is solid

@@ozdoganDS82 adds strength and sound proof

To the best of my recollection: for about 6400ft2, I paid $70K for materials & installation. The install was done by the manufacturer. I've installed Radiant Heat Tubes by two methods: First method: right on top of the planks with plastic clips and blue anchor screws to secure the tubes then covered them with grout of finish tile or stone flooring. Second Method: placed the heating tubes in the Cores after drilling holes at each end of the core and fishing the tube through. I recommend the first method. Since I did the work myself and with help from my three workers, I could Not measure the true cost, without some effort. I know I spent about $3-4K just on the Tubes & Hardware & Drill Bits . ' Hope this helps :)

@@ozdoganDS82 I saw that SpanCrete has some radiant tube solution where they have preformed tubes in each slab. It looked like they had a shrink-wrap system already built around their slabs. I was just curious how much that system added to cost. If you pay a radiant heating contractor, they can charge you as much as $20/square foot for a radiant install. You paid under $11 for the entire slab, installed by manufacturer. My guess is the manufacturer could do the radiant as a completed install for far far less than a radiant heating contractor.

Bishnu Gautam sir I think it depends upon the story drift of building. We are prestressed precast manufacturers in Nepal so we do minimum 125 mm bearing on either side.

You only need about 3" bearing on steel.

Usual 75mm-100 mm if placed on concrete or block work minimum. On steel work you can bear on 50mm.

Moses : The steel beams and posts were prime painted by the manufacturer and we also painted them three coats with antirust, antioxidant paint. They are electrically grounded. In about a few thousand years they may need to be serviced.

you make sure you take care of them so they dont rust

The Planks will be Topped with 2" & 3" of concrete with WWF Wire & #4 Rebar respectively. The planks are tied to the foundation walls with rebar & grout in most keyways for added stability. So far(Jan.2015), so good. The planks are still there; I had a heavy skid steer transport 8" CMU Block cubes (108Blocks/cube) on the planks and they held up :) . I had to drill hundreds of weep holes under the planks in every core before the winter, to prevent ice blowouts of the cores. That was very arduous but got it done.

@@ozdoganDS82 I used to get electric shocks all day when I use to drill the weep holes. Not the best part of the job.

nope