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Garage Slab 20' X 20' Edge Concerns

 
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Old 03-28-2010, 09:09 PM   #21
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Re: Garage Slab 20' X 20' Edge Concerns


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Originally Posted by CONCRETE MIKE View Post
If I was baiting you I would have used a zara spook or a hj12 huskey jerk, with 10 lb spider wire!
k fair enough....just trying to sort out whats what re the slab...could be l was given wrong info for project...heated vrs unheated may have some bearing re the slab...just trying to sort out whats what so l can proceed ahead and if they can do it in ottawa l should be able to as well with mayby a few variations re region

and thanx for link...belive me..l dont wana have to dig to frost level with all the added cost if l can avoid it

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Old 03-28-2010, 09:22 PM   #22
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Re: Garage Slab 20' X 20' Edge Concerns


I hope you plan to brace and stake the inside wall a lot better if you plan to keep it like that. 12" high concrete will snap that 3/4 plywood like a twig. It is no problem pouring it all at once, I do it all the time. As far as what requirments are it varies a lot place to place. If i'm doing it for a client I will do it either A. how the engineer and regulations are or B. How I know how to do it and know what works and what doesn't. Have had some problems doing slabs that engineers designed, but funny never ever a problem with anything I designed. Thickened edges are flat out junk 99% of the time.

I did one slab 24" thickened edge sloped up to 4" in only 2'. Gotta to be kidding me, of course what happened it cracked where it goes to 4" who could of seen that coming

Instead if they really want a thickened edge I will either go say 16" thick and slope it up to 6-7" in 4-5' so it is very gentle. But most of the time, a 6-8" pad is FAR superior. Even a well built 4" pad will stand up extremly well and take a lot of weight.

Garage walls and roof aren't heavy unless it's something special like living space or something above or anything that will put a lot of extra load on the floor.
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Old 03-29-2010, 05:58 AM   #23
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Re: Garage Slab 20' X 20' Edge Concerns


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Originally Posted by HHC View Post
You are allowed to use slab on grade design for accessory structures up to 592 square feet. This applies to all of Ontario, I don't know about other provinces. I am waiting on truss drawings and will be issued permit when they are submitted. Check out: http://www.cambridge.ca/relatedDocs/...ril%202009.pdf
This is the best site I have found for garage requirements.

Here are some updated pictures of my garage. I haven't done the digging around the perimeter to give it the shape in the drawing posted a few above. That will be tomorrow's work.
You need some top walers to keep that thing straight .
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Old 03-29-2010, 06:00 AM   #24
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Re: Garage Slab 20' X 20' Edge Concerns


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Originally Posted by mics_54 View Post
#1) I wouldn't have suggested it had I thought it wouldn't.

#2) More than one million FPSFs have been built over the past
45 years in Norway, Sweden and Finland, where they have
been approved by code since the 1970s. In Scandinavia, the
method is standard practice for low-rise construction,
including homes, townhouses, shopping malls, stores, office
buildings and schools. In the lower U.S., an estimated 3,000
FPSFs had been built by 2000, including single family
houses, townhouses, housing for the elderly and disabled,
additions, apartments, stores, and other commercial
buildings.
Additional FPSFs have been built in Alaska and Canada.
The U.S. Army has built several FPSFs, including an
addition to a conventional deep foundation for an airport
control tower in Galena, Alaska, near the Arctic Circle,
where the frost depth is 13 feet and winter temperatures
reach -60 F for weeks at a time. No frost heave or differential
settlement has been observed. For more information
see www.geofoam.org/pdfs/CRREL9707.pdf.

Sorry for the Swedish , but this is how they do it over there .
http://sv.wikipedia.org/wiki/Platta_p%C3%A5_mark
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Old 04-09-2010, 10:25 PM   #25
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Re: Garage Slab 20' X 20' Edge Concerns


jlhaslip nailed the slab spec and your prep looks goog HHc , i poured many slabs, with / without footing . I'ts been my experience, to pour the slab first, i then leave rebar "L' shaped or connected to perimeter bars , protruding through and along the wall perimeter . after3-5 days , then either form a knee wall or just go with 1 or 2 course of 8" or 10 " block (semi solids the final course) or flip and fill every 3rd block w/ concrete and threaded rod . Looks like you have good elevation , fro drainage , alot guys don't consider all factors , drainage is as equally as important as the slab in my opinon. saw cut your slab max. 10' x10' sections (4" slab cut approx 3/4 ") very important to cut even depth for proper controlled "break" Even in any outside driveway / patio side walks it's common for me to drop in 3/8" x 6" rebar in the slab about 2" depth , where i will later sawcut across. I have driveways and patio's that getting on 15 yrs + and still no "heaving" through freeze /thaw cycles. Hope this helps , and good luck with your project.
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Old 10-12-2016, 08:36 PM   #26
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Re: Garage Slab 20' X 20' Edge Concerns


Sooooo, how did the slab and garage work out? I'm planning a nearly identical project in the same city.
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Old 10-12-2016, 10:03 PM   #27
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Re: Garage Slab 20' X 20' Edge Concerns


He started that 6 years ago.
I don't think HHC comes around much anymore.
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Old 10-13-2016, 08:07 AM   #28
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Re: Garage Slab 20' X 20' Edge Concerns


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He started that 6 years ago.
I don't think HHC comes around much anymore.
He's still waiting on the concrete truck to show up their union drivers , but he did get the rebar.
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Old 10-13-2016, 08:18 AM   #29
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Re: Garage Slab 20' X 20' Edge Concerns


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He's still waiting on the concrete truck to show up their union drivers , but he did get the rebar.
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Old 10-13-2016, 01:29 PM   #30
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Re: Garage Slab 20' X 20' Edge Concerns


By now, that garage probably collapsed...
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Old 10-18-2016, 02:48 PM   #31
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Re: Garage Slab 20' X 20' Edge Concerns


Finally figured out how to login, has been a long time. The garage worked out extremely well. It will be around longer than I will. If you wanted to take a look at it, is at 182 Glebe Avenue. My inlaws sold the house a few years ago so wouldn't have access without asking the current owner. I followed much of the recommendations posted on this thread and didn't have to dig below frost line, huge plus. If I recall correctly the total cost was in the 25k range. Good luck
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Old 10-18-2016, 05:01 PM   #32
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Re: Garage Slab 20' X 20' Edge Concerns


Thanks for the update.
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Old 10-19-2016, 05:57 AM   #33
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Re: Garage Slab 20' X 20' Edge Concerns


Old thread, but I have built a frost protected shallow foundation in Ottawa with a building permit for a heated accessory building. Passed inspection just fine.

Thickened edge slab forming



I reused the forms to form the curb wall by sliding them up and forming on the interior on top of the slab with 2x10's



Insulated walls, and put down the frost wings. Due to site conditions though I couldn't get 2' horizontal everywhere, but made sure to get it at the corners.




Then parged with surface bonding cement over the expanded wire lath.
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Old 10-19-2016, 08:26 AM   #34
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Re: Garage Slab 20' X 20' Edge Concerns


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Old thread, but I have built a frost protected shallow foundation in Ottawa with a building permit for a heated accessory building. Passed inspection just fine.

Then parged with surface bonding cement over the expanded wire lath.
How did you fasten the wire lath to the foam? Looks like a nice job you did there.
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Old 10-19-2016, 08:43 AM   #35
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Re: Garage Slab 20' X 20' Edge Concerns


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How did you fasten the wire lath to the foam? Looks like a nice job you did there.
Thank you. Took a bit of research because it's not very common up here.

2" foam board and expanded diamond lath were fastened to the foundation with 5" tapcons Ave fender washers slightly depressed into the foam board (see picture 5 and 6). A little dab of pl foam board adhesive helps align the foam before putting the lath on.
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Old 08-10-2018, 10:51 AM   #36
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Re: Garage Slab 20' X 20' Edge Concerns


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Thickened edge slab forming



I reused the forms to form the curb wall by sliding them up and forming on the interior on top of the slab with 2x10's

I know this is an old thread ... I’m interested in doing something similar when I build my shed/workshop garage I want to attempt to do the concrete work myself I do have a little bit of exposure to working with concrete ... I’m wondering how you braced the inner form board (2x10) to keep it from kicking/blowing out when you poured the curb. I see a 2x4 sitting on the pad is that what is securing the 2x10 if so how is it attached to the pad..? or just giving the 2x10 lateral strength to prevent bowing ...looks like you mixed the concrete from bags for the curb ..?

Also how did you keep the outer form up ..? Just with stakes and used kickers to keep it in tight to the pad..?

I know there are a 1000 ways to do this just trying to educate myself on what way will work best for me. Originally I was going to try to do this with one pour, but read quite a few posts on the pros and cons

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