Aug 08, 2007 10:02 pm
This is a question for all those that have had their slabs poured and have at least begun the frame stage.
I'm getting excited now as we've had daily progress since our file went to construction. Today the boys were there to put in the trenching and pipes prior to having our slab poured. We are going to be 'boxed up' on Friday of this week and then will have the slab poured on Tuesday of next week (all very exciting for us)!
Just curious to know for those who have passed this phase, how long it took before frame stage began for you? How long does it take for the slab to dry, harden and settle before they come in and begin the frame stage? I'm guessing it's anywhere from a couple of days to about a week. Our blog is posted on the 'sticky' but for quick reference, check out our progress here:
Re: How long does a Slab take to 'settle?'2
Aug 09, 2007 12:00 am
Interesting question, we have everybodies opinion on this one lately (family and friends), anything from doesn't matter when the frame goes up because now days concrete is different and waffle pods take up the majority of the under slab cavity to 28 days. Our slab went down and wall framing went up two days later. I was personally a little shocked . Was assured no problems frame doesnt even weigh that much, tiles ect maybe a different story though.
Re: How long does a Slab take to 'settle?'3
Aug 09, 2007 6:20 am
Our slab sat for three weeks before they started the frame. It seemed like a long time then, but the rest of the house is going up so fast, that we have overtaken other houses that were being started at the same time that used waffle pods and had the frames put up the next day.
Re: How long does a Slab take to 'settle?'4
Aug 09, 2007 9:10 am
Check out this link to an earlier thread on the same topic...
My Blog... http://ahouseonthehill.blogspot.com/
Re: How long does a Slab take to 'settle?'5
Aug 09, 2007 11:45 am
Our slab used Waffle Pods, was exactly three weeks from the day the slab went down to when the frame work was up and finished (frame work took two days). Think that was more about the scheduling of the builder, not so much the time it took to set. We had steady showers on our slab so hopefully it should have cured nice and slowly.
Re: How long does a Slab take to 'settle?'6
Aug 09, 2007 10:49 pm
Thanks for all the replies and Firthy_26, thanks for the link to the previous thread. I was pretty certain that someone had probably posted a similar topic previous to mine, but I was too lazy to hunt for it!
I threw the same question out there to my construction administrator today and she came back to me saying that the framer was scheduled for the following week and will confirm a date for me when we speak again next Wednesday. So, it looks like (in my case) framing will start about a week or so after the slab has been poured. Don't really know if they could actually start sooner than that, but I'm probably more comfortable letting the slab settle and cure for a week than starting a day or two later. On the other hand I'm also glad it's not two, three or 4 weeks after the slab was poured, as it will be fun to watch the rapid progress of the frame stage!
Re: How long does a Slab take to 'settle?'7
Aug 10, 2007 12:32 am
Here is some information that I found on a website
Curing of all cement-based building materials is critical to achieving the design strength and other desired properties, especially with structural concrete slabs. Concrete takes 28 days to reach the design strength, although a sufficient minimum design strength may be achieved in less time if the concrete is specified accordingly. It is essential that the curing regime specified by the design engineer is followed exactly.
http://www.greenhouse.gov.au/yourhome/t ... /fs34f.htm
Yet on another website it says
What is curing and how do I cure my new concrete slab?
Concrete hardens as a result of hydration, that is the chemical reaction between cement and water. Hydration occurs only if water is available and if the concrete's temperature stays within a suitable range. After placing concrete, the concrete surface needs to be kept moist for a period of time to permit the hydration process. this period is referred to as the curing period and is usually 5-7 days after placing conventional concrete. New concrete can be wet with soaking hessian, sprinklers or covered with wet hessian or plastic sheets or can be watered with commercially available curing compounds which seal in moisture.
Could not find anything about when you could start building on it exactly
Re: How long does a Slab take to 'settle?'9
Aug 10, 2007 6:22 pm
For us our Waffle Pod slab went down on the 2nd of july.
7th july they began laying out bottom plates.
9th July they began framing.
Hardwood tassie oak frame.
currentlythey are finishing off brickwork and roofing, windows and glass sliders are in.
Re: How long does a Slab take to 'settle?'10
Aug 10, 2007 10:18 pm
I hear that it is easier to get nails and dynabolts into the slab when it is not quite completely cured, hence th reason for starting within a week of pouring.
Re: How long does a Slab take to 'settle?'11
Aug 11, 2007 8:54 am
There's some amazing information on the web, if you just know where to look (and have plenty of time).
Thanks to law18, one of the websites that was listed led me to a great concrete website. I call it everythign you ever wanted to know about concrete, but didn't have a lifetime to read it. It's the Cement, Aggregates and Concrete Australia website:
One of the datasheets on the website is entitled Curing. From the datasheet we have, compared to curing for 180 days, "concrete
allowed to dry out immediately achieves only 40% of the strength of the same concrete water cured for the full period of 180 days. Even three days
water curing increases this figure to 60%, whilst 28 days water curing increases it to 95%. Keeping concrete moist is therefore, a most effective way of increasing its ultimate strength."
So I would go for curing for 28 days. This should result in a great concrete slab and minimal problems in the future. Note, this is curing for 28 days, not just waiting for 28 days. From what I can gather, curing can be as simple as leaving it covered with plastic.
Hope this helps.
Demolition August 2009, Construction Started September 2009, Completed December 2010
Re: How long does a Slab take to 'settle?'12
Aug 12, 2007 4:39 pm
from a bit of reading, they are now using a curing compound (spray) instead of having to wrap the slab in plastic or keeping it moist with water (to many water restrictions around here). Apparantly the spray is applied straight after the slab is done which traps in the moisture in the slab so it dries slower. But all interesting reading alot goes into building a house and so far we have enjoyed learning and experiencing every bit of it.
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