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  1. Enable

    Attachment to Existing Terra Cotta

    I would probably specify in-situ testing in a variety of panels with a few different conditions (e.g. some centered, some closer to edge, etc.). That's our usual course when we're outside published tables, which is not an infrequent occurrence. If you don't have that opportunity at the design...
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    External anchorage of reinforcement - is this feasible?

    Sounds like OP's case will develop tension in the bar that will exceed the bars ability to develop that tension capacity if it's not otherwise anchored. This occurs at free edges of balcony slabs and the like where we have a large line or point load (and bar area varying across the length). In...
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    Shoring OSSJ with wood?

    For this kind of situation I've generally used post shores at a convenient location beyond the wall, and installed blocking friction fitted b/w chords. Similar to Bones setup in this thread. If you require additional stability you could use frames or PERI MP props w/MRK frames. EDIT - You'll...
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    House Review - Site Visit without report?

    I’ve been a contractor far longer than I’ve been an engineer, but that experience taught me something I feel may be prophylactic for some in this thread. You can’t stop crazy people from doing crazy things or hot heads from doing hot head things. If someone is the type to sue at the drop of a...
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    Minimum Aggregate Size for Slab on Grade

    As a contractor I'll sometimes use pea gravel (10mm) in areas of high congestion or those that are difficult to vibrate and where self-consolidating concrete is not an option. But none of that is applicable to a slab-on-grade. I would expect a 3/4" max aggregate size for most slabs-on-grade...
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    shoring strategy

    Can you span a distributing member (e.g. a nice stiff W-section) to something around the repair area (e.g. shear wall), which you can in turn rest the shores on? You have to take the load down at some point so there is no magic. We either transfer at the level we're working on or we try to hang...
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    Spalled Concrete

    I probably could have been clearer with those statements. But @BridgeSmith has is right. Passive Shoring and Active Shoring are the technical terms sometimes used to distinguish shoring that is merely placed to handle any loads that redistribute during the repair (Passive Shoring) and shoring...
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    Spalled Concrete

    You certainly would not want to specify that particular bonding agent. You have an issue with open working times where the repair has to be formed, and concrete placed, prior to it expiring. With the product you selected that looks to be about 2 hours at room temperature from the datasheet. That...
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    Another how to fix it thread

    Of those commenting on the nails missing the joist, how do you know they didn't realize when they felt the nail discharge and try again? Perhaps that is why there are two already so closely spaced in a sub-floor. They clearly tried somewhat as evidenced by the adhesive, which would be entirely...
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    Yay, Masonry Veneer House

    If you attach it won't you be loading the masonry veneer with snow / roof LL since it'll be much stiffer than the rafter in bending? In scheme of life probably not a big deal either way, but strictly speaking we're not supposed to load those guys. I'd probably leave it unattached. If you're...
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    Builder Ethical Woes

    JAE has it right. You cannot absolve yourself of your duty to public safety by either having the owner rectify the situation or else report the existing condition to the Authority Having Jurisdiction (AHJ). However, that doesn't mean it needs to be done in the same document that closes out the...
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    Misadventures in Rubber Stamping

    The bridge example is not on as solid ground as you may think
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    Misadventures in Rubber Stamping

    Perhaps from a strict view of professional ethics there is some issue with using one’s stamp in this way. But honestly, I feel quite okay, ethically, with what has transpired here. A routine item was evaluated in terms of probability of failure vs risk of failure prior to plan stamping in the...
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    Optimizing insulation methods in PEMB building.

    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...
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    Cold weather curing challenges for high-rise concrete slabs

    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...
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    Cold weather curing challenges for high-rise concrete slabs

    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...
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    Cold weather curing challenges for high-rise concrete slabs

    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...
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    Residential renovations suck and are not worth the fees! {PROVE ME WRONG!}

    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...
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    Assessing Plug Welds with Blodgett Line Method

    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...
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    Ethics Double Check

    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...

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