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Balcony Collapses at Edmonton Apartment


FrankWoeste
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Re the balcony collapse last weekend, this post raises some design questions.

Referring to this document:

http://www.wwpinstitute.org/mainpages/d ... un1807.pdf

do you think that cantilevered balconies fall into the UC3A category or the UC4B use category (or higher)?

UC3A — Wood and wood based materials used in exterior construction that are coated and not in contact with the ground. Such products may be exposed to the full effects of weather, but are in vertical exterior walls or other types of construction that allows water to quickly drain from the surface.

UC4B — Wood and wood based materials used in contact with the ground either in severe environments, such as horticultural sites, in climates with a high potential for deterioration, in critically

important components.

Referring to the first table in the wwpinstitute.org document, UC4B calls for about three times (3x) the chemical retention that is required for a UC3A use.

Questions for discussion.

Should cantilevered balconies be permitted to use “Above Groundâ€

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Hi Frank,

I met you at the Finger Lakes Building Official conference- the topic was truss creep as I recall. Anyway, I was the 37th guy to shake your hand following the presentation. You and Joe made the other twenty hours of drudgery almost bearable.

Thanks for the provocative post and hope to see more input from you in the future.

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Re the balcony collapse last weekend, this post raises some design questions.

Referring to this document:

http://www.wwpinstitute.org/mainpages/d ... un1807.pdf

do you think that cantilevered balconies fall into the UC3A category or the UC4B use category (or higher)?

Neither. They'd fall into category UC3B. Category 4 is for materials in contact with the ground.

UC3A — Wood and wood based materials used in exterior construction that are coated and not in contact with the ground. Such products may be exposed to the full effects of weather, but are in vertical exterior walls or other types of construction that allows water to quickly drain from the surface.

UC4B — Wood and wood based materials used in contact with the ground either in severe environments, such as horticultural sites, in climates with a high potential for deterioration, in critically

important components.

Referring to the first table in the wwpinstitute.org document, UC4B calls for about three times (3x) the chemical retention that is required for a UC3A use.

Where do you see that?

Under copper nap, I see a range from .04 to .06

Under creosote, I see a range from 8 to 10

Under Penta, I see a range from .3 to .6

None of those is even close to a 3x increase.

BTW, on line 9, under Copper Nap, I believe there's a printing error. I should be .06, but it's printed as .60. That's way out of line with everything else in the chart.

Questions for discussion.

Should cantilevered balconies be permitted to use “Above Groundâ€

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Deck in Burlington,Ma. fell off of a house. Rotted wood-six people hurt.

Gathered after a funeral. No other HI information available.[:-banghea

Yes, Frank mentioned that one.

What would be useful is to find out whether or not the wood was treated and, if so, what category of treatment it was.

- Jim Katen, Oregon

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Hi,

Well the ledger and hangers are still visible in the video; so it wasn't the ledger that separated it was the joists that either sheared (doubtful) or pulled out of the hangers (more likely). Now I have to wonder whether the inner ends of the joists were rotten or whether they'd failed to use a nail in every hole in those hangers.

ONE TEAM - ONE FIGHT!!!

Mike

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