HomeMy WebLinkAboutEngineer Framing Letter 11.07.2022Fire Tower Engineered Timber, Inc.
104 5th Street o Calumer, };lI49913 " 906.379.0520
7 Nov 2022
Davicl Gagne
Canadian Timberframes
Golclen, BC V0,\ 1H0
Re: Jeroninrus I-joist drillings in u203-205
David-
Per your aclditionai request, we reviewed the capacity of the I-joists on the 2"¿ floor, above the
fìrst-floor "jack ancl jill" bathrootn, where there were (3) 4" diameter holes in faidy close spacing. The
spacing ancl quantit)' of the hoies exceecls the prescriptive lim.itations for hole size/ spacingTq,rnãCty. A,
previousJy mentioned, those prescliptive limitations are proviclecl by the manufacturer for â reason;
exceecling them can clramarically reduce the capacity and perforrrance of the I-joist.
While â cover plate was addecl over the "middle" hole that wâs no longer being usecl, rve did not
attribute an)¡ câp^city to these plates, âs there are specifìc naiüng/glueing requirements in orcier ro re-
estabüsh capacity. However, for these specific I-joists, we conducted a more thorough analysis based on
a long rectangular opening (akin to what we'd see for ciuctworþ rhar encompasses the three holes.
Based on tlìe relatively shott span, ancl the capacity of the unaiterecl joist, these driilings are acceptable,
Best,
Joe Miller, Ph.D., P.E., P.Eng.
Principal
F'ire Tower Engineerccl Timber
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Fire Tower Engineered Timber, Inc
104 5th Street o Calumet, l'/.I49913 " 906.379.0520
3Nov 2022
David Gagne
Canaclian Timberframes
Golclen, BC VOA 1H0
Re: Jeronirnus I-joist drillings in FJ216/217
Davicl-
Per your request, we reviewecl the capacity of the I-joists on the 2"ð floor, which hacl a iarge
number of drilJings for electrical ancl plumbing lines. The spacing ancl quantity of the holes exceeds the
prescriptive limitations for hole size/spacing/quantity. Those prescriptive limitations are provicled by
the manufactlrrer for a reason; exceecLing them can dramatically recluce the capacity and performance of
the I-joist.
For these specifìc I-joists, we conducted a more thorough analysis based on this specifìc loading
condition with these specific holes using engineering mechanics. The conttolling capacity recluction was
based on the shear capacity near the end, which was based on two holes close together (which
functionecl âs one large hole, see photo below). However, based on the relatively short span, ancl the
capacity of the unaltere d joist, these clrillings in the u216 /21,7 joists are acceptable. If these drillings
continr-re tnto FJ2|B joists in a similar fashion, temediation or replacement will be required.
lìest,
Joe Millet, Ph.D., P.8,., P.Eng.
Principal
Fire Tower Engineerecl Timber
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