Burke Residence 140714_Memo s1310028.pdf
7/14/14
To: Leif Bjorback
Building Official
City of Edmonds
From: Ron Skinner, PE
Re: Burke Residence
17903 Vista Del Mar Drive
Edmonds, WA
Grade Beam leveling footing
SSS# s1310028
On July 8, 2014 I conducted a site visit at the above mentioned address to observe the
existing condition of the poured footings. I was provided photo’s of the steel and
footing form work from before the pour. From the sampling provided, there is sufficient
evidence to conclude that the necessary elements are present to perform as intended.
Clear cover is difficult to determine in the photos, but I would anticipate minimal
moisture given the slope and with adequate water-proofing of the walls and good
footing drains, I am comfortable that any marginalized clear cover will not become a
detriment to the footings. They will perform as intended.
The basement is being constructed as slab on grade with in floor heating so to
accommodate the insulation requirements, I am providing an alternate grade beam for
the location shown on the attached key plan, I’ve identified it as GB2. The other grade
beams on the key plan are identified as GB (note, a 6’ option was previously provided)
and those not supported by piles are per the typical stem wall detail on sheet 9. The
attached detail SF – Stepped Footing
If you have any questions or require additional information, please call.
Attached:
( 2 pgs) GB2 Detail & Calculation
( 1 pg ) GB 6’ foot option
( 1 pg ) SF – Stepped Footing Detail
( 1 pg ) Key Plan
6628 212th Street SW, Suite 205 - Lynnwood, WA 98036 - Ph: 425-778-1023 - Fax: 206-260-7490
Beam Design
Design Criteria:
b
24
in
w
h9
in
2
Top CLR
in
2
Bottom CLR
in
4
NB
#4
Bar Size#Transverse Reinforcement
0.5in
Diameter
s=12in
=
SIZE
in2#3
Bar Area0.2
stirrup
f'
2500psi0
NB
c
A
=
0.850
0
v
1
f
psiIs Min shear reinf. per 11.4.6.1 Req'd?
60000No
y
f
psi
40000
s
Results:
VM
A
lbsft-lbs
s max,max,
negOKOK1395022606
posOKOK1395022606