HomeMy WebLinkAboutRe: foundation supporting 2nd floor NOTCH
ENGINEERING =�
CO1250 Morningview Drive �
■ Mound. Minnesota 55364 . '
(612)472-5566 ��i_� .:....�
December 7 , 1992 v
D E C 9 `s�9?
Mr. Lvle Oman, Building Official
City of Orono
1335 South Brown Road
Crystal Bay, Minnesota 55323
Re : Mr . Tro�- ?.nderson' s Residence
1490 Long Lake Boulevard
Orono , Minnesota
Mr. Oman,
Notch Engineering Co . made a field observation at the above
referenced residence on December 3 , 1992 in order to determine
if the existing foundation was capable of supporting a second
floor addition. From the cellar of the residence I was able to
view the continuous wall footing and masonry foundation wall .
In one location on the wall behind the furnace the soil had
been excavated vertically from the bottom of the wall footing
to the slab on grade below. This condition is not acceptable
and should be corrected by pouring a six inch thick poured wall
adjacent to the exposed vertical face of soil . The new wall
should be reinforced with #3 rebars at 10" o . c . each way. The
rebars should be centered in the wall thickness and should be
drilled and epoxy �routed into the side of the existing wall
footing above and doweled into the slab on grade below.
It was noted that the existing footing does not meet the
current building code frost depth requirement of 42 inches
below grade to the bottom of the footing , however , this house
was built in 1951 and no frost induced foundation problems have
occurred to date. as long as the grades are not altered in any
way that would affect surface drainage and the underside of the
first floor is not insulated, I see no reason to underpin the
existing foundation to meet the 42" depth requirement .
In conclusion, the existing foundation system will be capable
of supporting the proposed second floor addition. I was told
that the second floor trusses and roof trusses will clear span
the entire residence and I prepared my calculations in
accordance with this information.
If vou have anv questions or comments on this correction please
feel free to contact me .
Sincerel�- �roiirs ,
���i�'mQQ�G. i���o�
"lhvrnas E . �;otch , I'. E .
Structural Engineer
cc : file STRUCTURALDESIGNSERV/CES