1197 Spoonbill Cir - 2009-12-30 Joist AnalysisMCCONKEY
JOHN
INC.
CONSULTING
ENGINEERS
241 CLEVELAND
AVE. S., SUITE B2
ST. PAUL, MN
5 5 1 0 5 - 1 2 6 0
651.698.5626
FAX:651.698.5628
4
Integrity Home Services
803 Central Avenue South
New Prague, MN 56071
Attn: Duane Larson
Re: law Spoonbill Circle -Joist
MN
Ihvaject 9
Mr. Larson,
sis
December 30, 2009
At your request we performed a structural analysis of the existing floor joists at the referenced
residence. You have asked our opinion regarding the capacity of the joists to support live and dead
loads per the Minnesota State Building Code (MSBC) in light of the existing holes in the joists that
were made for running wiring. Our analysis was based on the following information provided by
your group regarding the existing conditions:
• Joists are 2x10's at 16" o/c
• Joists span 15 feet
• Joists have 1" diameter holes for wiring that are approximately 6 feet from one end
condition. The center of the hole is approximately 1 -1/2" from the bottom of the joist.
Also, our analysis was based on the following assumptions (Please contact our office if we have
made any incorrect assumptions):
• There are no extraordinary loads on the floor above (thick -set tiling,
heavy appliances, etc.)
• The floor joists carry no additional loads from other floor levels
• The joists were properly sized to support live and dead loads per the MSBC (the correct
species of wood was chosen to span the 15 feet between supports)
Results of analysis and recommendations
The results of our analysis showed that the existing joists are not capable of supporting
live and dead loads per the MSBC with the penetrations for the wiring. We recommend adding
2x8 joists xl 1' -0" long to the original 2x10's (center on the 15 foot span). The new joists shall
be spruce- pine -fir #2 material or better and may be ripped to 6 -3/4" depth if it makes installation
simpler. The new joists shall be flush with the top of the existing 2x10's. Attach the new joists
to the original members with (2) 16d common nails at 12" on center (2" from the top and bottom).
Space the first 3 pairs of nails at 4" on center at each end of the 24$'s.
Please contact our office with any further questions or comments regarding this topic.
Respectfully Submitted,
4 1( 0(
Richard W. Johnson, P.E., Principal //// Minnesota Registration #23406 / Q