4510 Thomas Lake Cir - Dining Room Window Header Framing ChangeTerri Soderbeck
Country Joe, Inc.
18133 Cedar Avenue South
Lakeville, MN 55024
Dear Ms. Soderbeck:
■_ Voigt & Associates, Inc.
STRUCTURAL ENGINEERING SERVICES
4635 NICOLS RD. SUITE 204
EAGAN, MN 55122
PH. (651) 686 -7727 FAX. (651) 686 -8444
Fg'hursday, November 04, 2010
RE: Dining Room Window Header Framing Change fo 4510 Thomas Lake Circle,
Eagan
rin i � r 6,,m o3
Per your request, I visited the jobsite to observe the framing of the dining room windows
on the rear elevation of the house under construction at the above address. The building
inspector noted that the header framing deviated from the detail shown on page 5/6 of the
city reviewed and approved plan. Rather than using individual headers for each window
with 3 studs installed from bottom plate to top plate, your framer installed a long header
that spanned all four windows with 4 studs installed from the bottom plate to the bottom
of the header. As framed, the headers and studs support gravity loads without problems
but it presents a problem for wind loads. Wind load (horizontal loading) is carried by the
wall framing from wall bottom plate to top plate. As framed, the only studs that reach
from bottom plate to top plate are at the ends of the window banks over 13 feet apart.
The wind load that they have to carry is very large. Additionally, the wind load has to be
carried to them by way of the out -of -plane (weak direction) bending of the 2 -ply 11 -7/8"
LSL header.
Rather than overtax the existing framing, the repair will restore sufficient bending
capacity of the wall in a manner similar to the original detail. The location of the hinge
point and the material around the joint lends itself to a mechanical strap repair.
Attached you will find 2 pages of details that show 2 views of the same fix. Install 2x10
blocking (snugly) between the tops of the jack studs between windows and the bottom of
the top plate over the LSL header (4 locations). Install with grain vertical. Nail blocking
to LSL header with 12- 10d nails. Install one thickness (probably '/2") of OSB or
plywood panel to "pack out" the header flush with the inside face of the jack studs. Nail
panel to 2x10 with 8 -10d nails. Install 2 Simpson LSTA21 straps (or similar) at each
stud location. Fill holes with 10d nails —half of the strap over the jack studs and half
over the freshly installed 2x10 and packing.
The information and opinions contained herein are based upon the limited investigation
described at the beginning of this report. No warranties are expressed or implied
regarding the existence of other unknown conditions not specifically addressed. Our work
Voigt & Associates, Inc.
STRUCTURAL ENGINEERING SERVICES
4635 NICOLS RD. SUITE 204
EAGAN, MN 55122
PH. (651) 686 -7727 FAX. (651) 686 -8444
is in accordance with generally accepted engineering standards and is not intended to be
relied upon or transferred to individuals other than the addressee. Should information or
conditions become known which differ from the discussion herein, they may alter the
opinions or conclusions of the undersigned.
Please call if you have any questions.
Sincerely,
Rex N. Swanson, PE
612.280.4501
rswansongvoigtandassociates. com
I Hereby Certify That This Plan, Specification, Or Report Was Prepared
By Me Or Under My Direct Supervision And That I Am A Duly
Licensed Engineer Under The Laws Of The State Of Minnesota.
P O.t. w.
Paul W. Voigt
Date 4- Nov -10
License Number 20705
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Voigt & Associates, Inc.
STRUCTURAL ENGINEERING SERVICES
4635 NTCOLS RD. SUITE 204
— EAGAN, MN 55122
PH. (651) 686-7727 FAX. (651) 686-8444
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- STRUCTURAL EiVGLVEERING SERVICES
4635 NICOLS RD. SUITE 204
- EAGAN, MN 55122
PH. (651) 686 -7727 FAX. (651) 686 -8444
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