Seems like you're mixing up air barriers and vapor barriers (which is no doubt common, see here), and haven't mentioned the exterior climate (at least in your post) while making the decision about insulation requirements / vapor barrier locations (which is a big no-no especially since you seem...
I generally agree with your synopsis but have a few caveats to add.
There is technical literature on rates of evaporation and its impact on concrete curing, just generally not in the cold concrete literature (e.g. you wont find it in ACI 306 or in CIP 27 by NRMCA). I've typically found things...
I understand your concern, and it’s absolutely valid! But it’s also why I was trying to frame things in terms of reducing drying potential. You do not need to employ external moisture retention strategies as long as the surface drying potential of the slab is sufficiently low. This is generally...
I do shoring and re-shoring designs in the Ontario market for these kinds of projects. In general, curing methods are less than ideal in all seasons due to the rapid pace of construction. Somewhat ironically then, I have found that conventional curing protocols in the winter actually produce the...
It seems like others have covered the ground thoroughly enough that I cannot possibly add more to the mix, but since you asked to be proven wrong, I’ll add my contribution for posterity. Perhaps it’s worth noting that my main source of revenue is via contracting (heavy metal fabrication) rather...
If the orientation / magnitudes of your loads are such that the resultant places some of the plugs in tension, then I would say that this is all for not since you're generally not allowed to utilize plug welds for such applications (link).
However, if your plugs are large enough you can treat...
It's a conflict only to the extent that providing engineering services to any client that pays you for your services is a conflict. We always have an interest in producing more economical designs or less demanding details or being as lenient as possible, etc, etc.
I would not frame it in such...
For Canadians, this is all spelled out via our performance classes (cut sheet). Might be useful as a guide for you. Also, one thing that's often overlooked is the construction cycle. While some items may not require an air entraining agent due to limited freeze-thaw exposure, during service...
The specific product you've linked to is quite widely used in Ontario, so I wouldn't have concerns about satisfying your building department (sans seismic at least). In general, there is no grand test for fasteners that de facto qualifies them as NBCC compliant. However, the NBCC sometimes...
I've seen this condition built. It's a non-issue if you use appropriately rated XPS (HL variety) coupled with some projection into the floor area. If you read the article you'll note that Joe even says while this can be done, it's annoying. And, as mentioned, exterior borne insulation is...
I would doubt that it was a local code change so much as people are moving more towards Joe's details. You can find a bunch of Dr. Lstirburek's details for this condition here. If you only insulate the inside vertical face and underneath the slab, then the slab is still coupled to the stem wall...
If you do not feel comfortable using an off the shelf product you can always have them fabricate it that way. Just weld a nut to the HSS top plate and let a threaded rod slide through (drill a hole - dont torch, punch or plasma cut it). Also weld a nut to end of threaded rod in contact with...
This is awesome. My students struggle with interpreting code language and understanding how it applies in reality, so this will be a great resource for them. Thanks for letting us know dik!
Having worked on exterior slabs in dead of summer for many years I would say that this is not a concern. As XR250 mentioned, there is significant thermal mass to the slabs that mitigate the effects you're concerned about (at least in Ontario / Canada. May be a thing in Arizona though?).
Hilti...
As a contractor I used to switch between Hilti HY-200 and HIT-ICE depending on the substrate temps. It's probably more well known in Canada due to our range of temps. Cure time chart below for the two options (where they dead end is beyond usable range).
Hot temps are not a big concern for us...
