HomeMy WebLinkAbout6.1 KidderRoofingWaiveInspection
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AGENDA STATEMENT
CITY COUNCIL MEETING DATE: June 14, 1993
SUBJECT: PUBLIC HEARING
Request by Kidder Roofing to Waive the
Requirements for an Inspection of the Nailing
of the Roof Sheathing Where the Work was Done
Without Inspection at 6880 Portage Road,
Dublin
Report by: Victor Taugher, Building Official
1) htop Work Notice
2) /warning Notice
3) /,Letter from Kidder Roofing dated 3/2/93
4) / Letter to Kidder Roofing Responding to
~Letter of 3/2/93
5) Letter from Kidder Roofing dated 6/8/93
6)~Engineering calculations by Marie C.
Goodman P.E.
7)/ Critique of Calculations Prepared by
,Marie C. Goodman P.E.
8) / Installation of Plywood over Existing
,Skip Sheathing Handout
9)//Section 7.28.140 Dublin Municipal Code
10) / Draft Resolution Granting Request
11) ,/Oraft Resolution Denying Request
EXHIBITS ATTACHED:
RECOMMENDATION:
~
1.
2.
3.
4.
5.
6.
open Public Hearing
Receive Staff Report
Receive Public Testimony
Close Public Hearing
Deliberate
Adopt Resolution Approving/Denying
Request
FINANCIAL STATEMENT:
No Additional Cost.
DESCRIPTION: On Thursday, January 28, 1993, while driving
from one inspection to another it was noted the house at 6880 Portage
Road was in the process of having the roof replaced. The existing
wood shakes were being replaced with composition shingles. This
requires stripping off the old shakes and installing plywood sheathing
over the existing spaced boards. Then the roof covering is installed
over the plywood.
No one was on the job at that time so a Stop Work Notice was left at
the site. (Exhibit 1). The notice indicated that the roof covering
had to be removed so that the nailing of the plywood could be
inspected. At that time, the plywood sheathing installation was
substantially complete and a portion of the new roof covering was
installed.
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ITEM NO. ~.1
COPIES TO:
CITY CLERK
FILE,
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On Friday, January 29, 1993, a permit was issued. At that time Mr.
Kidder was given a copy of a sketch (Exhibit 8) showing requirements
for installing plywood over existing spaced boards. He was also
advised to remove the roof covering, install the plywood per the
sketch and arrange for an inspection before proceeding any further.
This advise was ignored and on Monday, February 1, 1993, it was noted
that the work had been completed without any inspections.
On Tuesday, February 2, 1993, a Warning Notice was issued requesting
compliance within 10 days (Exhibit 2).
On Thursday, February 4, 1993 the Building Official related the
concerns of the Building Inspection Department to Mr. Kidder by
telephone. The issues are:
1) The plywood was covered without inspection and it needs to
be inspected. It cannot be inspected without removal of a
portion of the roof.
2) When the long edges of the plywood falls in the space
between the boards support is required.
In that telephone conversation, Mr. Kidder suggested a possible
solution would be to have an engineer analyze the condition and
demonstrate that the plywood edges need not be supported. The
Building Official advised Mr. Kidder that any analysis would be
subject to his approval and that sufficient plywood would have to be
exposed to verify the adequacy of the nailing.
Table 25-0 of the code requires the plywood to be nailed with 8 penny
nails at 6" on center at edges and 12" at intermediate supports.
On March 11, 1993, the Building Official responded to Mr. Kidder's
March 2, 1993 letter (Exhibit 3 & 4). The Building Official indicated
removal of approximately 10% of the roof would be acceptable and
indicated that 10% insufficient or improperly driven nails would be
acceptable.
On April 29, 1993, arrangements were made to inspect a 10% sample of
the roof to check the nailing. This was to be done at 7 locations.
Plywood was exposed at one location and the nail spacing and
installation was found to be deficient. Mr. Kidder decided not to
continue to expose the plywood at the other locations.
On June 8, 1993 Mr. Kidder submitted a request for this hearing
(Exhibit 5) along with calculations prepared by Marie C. Goodman P.E.
(Exhibit 6). Apparently the request is to approve the roof as is.
The calculations have numerous errors as indicated in the Building
Official's critique of the calculations (Exhibit 7) and do not address
the lack of support of the long edge of the plywood. In addition,
they attempt to justify the reduction of nail spacing by showing that
the plywood roof provides greater resistance to lateral forces from
wind or earthquake than the supporting walls. Exhibit 7 points out
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the errors in those calculations. The calculations are based on an
assumed nail spacing that has not been verified by inspection and
ignore the requirements for wind uplift.
Mr. Kidder has indicated that he feels that the Building Department
sketch (Exhibit 8) showing how to install plywood over spaced boards
does not meet code and therefore, the roof should be approved as is.
His engineer has incorrectly advised him that there is insufficient
nail penetration where the plywood is nailed to the rafters.
Mr. Kidder's engineer is correct in that where the ends of the plywood
sheets do not fall on a rafter the penetration is only 3/4" into the
boards and the boards are not "framing members." Section 7.28.140
Dublin Municipal Code (Exhibit 9) authorizes the Building Official to
approve alternate material and methods of construction. The Building
Official has determined that the method shown in Exhibit 8 is
equivalent to that required by the code because there are 5 more nails
in the plywood in this configuration. Although some have reduced
values because of reduced penetration, the additional 5 nails result
in a total of 3% higher total nail strength.
The reason for approval of this alternate is to minimize cutting of
plywood sheets so as to fit existing rafter spacing. This results in
a savings of both labor and material and achieves the equivalent of
what the code requires.
Recently the Building Department required removal of roof covering and
renailing of the roof sheathing in a similar circumstance at another
location.
In summary, the plywood nailing was not inspected. Uncovering the
plywood at one location revealed insufficient nailing and the long
edges of the plywood may not be supported. The deflection of the
unsupported edge of the plywood can cause the underlayment to tear.
Insufficient nails can cause the roof to fail due to wind uplift.
Therefore, the Building Official recommends that this request be
denied.
If the City Council approves the roof without further inspection,
written approval from the owner of the property should be required.
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, STOP WORK ORDER 1
Job Address 6EJ'P'<J - VC)k....,..~CF'- Date \ -1.T....-Q~Time 'Z<::s' ~M
Description of work KE. - ~O();:.. ( ~ U A 14. I:::'. "'\(-, ('() ('..\ v.
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You are directed to stop all work on the above until you have secured a permit and approval of the work which has
been completed to date. Work without a permit is a violation of SectiQ~ 12.0, Dublin Building Regulations.
Z'O. iOO
To avoid legal action please apply for a permit for the above work in 10 days. In order to secure a permit you must
submit 2 sets of plans which are drawn to scale and which accurately show the work which is proposed. In general the
following will be required:
o
o
o
o
plot plan 0
roof framing plan
electrical plan 0
electrical load calculations
key plan 0 foundation plan 0 floor plan
o exterior elevation views 0 cross section and details
plumbing plan
o mechanical plan 0 heat loss calcs
o single line electrical drawing
o Plan must be prepared by a Registered Civil Engineer or Architect.
o Above plans to be drawn to Yo" to I' scale, except plot plan may be drawn to suitable scale on minimum of
17" to 22" paper.
o Other information may be required by the Building Irispection Department at time of plan check.
o Other
INSPECTOR'S COMMENTS:
o Remove covering in the J2nn;:.... so that (a) electrical, (b) plumbing,
(c) mechanical, (d) insulation, (e) structural may be checked. t-..lA \ I.-'~ '''-1 c..-
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o Verify size and depth of existing footing by digging a small inspection hole adjacent to and under the footing.
o Provide an l.C.B.O. number, make and model or a U.L. listing number with approved installation in-
structions for to be used.
~ Other ~Oli..l';_
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Inspector
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WARNING NOTICE
CITY OF DUBLIN . BUILDING INSPECTION DEPARTMENT
YOU ARE HEREBY NOTIFIED THAT A VIOLATION OF THE DUBLIN CITY ORDINANCE CODE EXISTS AS DESCRIBED BELOW.
FAIWRE TO COMPLY WITHIN THE TIME SPECIFIED MAY RESULT IN A CITATION BEING ISSUED WHICH MAY REQUIRE
YOUR APPEARANCE IN COURT AND A FINE OF UP TO $500.00.
To Kidder Roofin~
Owner I Contractor I Agent
Date: February 2, 1903
Location of Offense: 68S0 Portag-e Road.. Dublin
( 51"\) 'xQ ,..,' -II
Phone: \ u.o~"-_~~
Name: Kidder Roofing c/o ~Iike Kidder
~usiness Address: 1.!::;~ Gr'oV(-'~ ';,;av E1 i. Concord. CA 01::;1Q
Residence Address:
Code Section
Description of Violation
Taol.e :2 )-3-1 rniiorm 2uLlding
Coce (1991)
:Support; and nailing of she':l.'ching not per i:unin:um coce
requi remenc 5 .
-,,~ -':)T' '1' ,- , , 1
I . ..:.'~. )OL LiUO 10 l'iJn1.Clpa_
(Insgection Aequired)
Cede
Failure to call for or have plY'.,,-ood nail ing inspec::ion ~T'ior
to cover'ing r'oor ,..lith composition.
THIS VIOLATION MUST BE CORRECTED AS FOLLOWS:
?"L:-.Dn: COMPOSITIO:J A~.;D ?ELT FRO!-! ROOF. 2L'PFORT PLY',,,DOD PER TABLE :25-:3':"1 L":;TFC32I 3nLJ=~~G
CODE. HAVE PLI'1,..l)OD :\AILT\"G r;.;SPECTIO>i PRiOR TO I:{STALLATIO~ OF FELT .-\),1) SHI:iGLES.
Further enforcement action will be postponed if you correct the above listed violation(s) within 1 (\ (t.en)
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Issuing Officer
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days.
Senior Bldg. InsD.
Title
Office Address: t()O Civic Plaza, Dublin, CA 94568
PhonE:
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KIDDER ROOFING
1455 Grove Uay, Concord. Ca 94518
(510) 689-2341 Lie I 609607
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3/2/93
MI"". V!ok Teugher
Building Official
City of Dublin
Dear Mr. Taugher,
Your department has filed a complaint with the State
Contractors Board concerning the property at 6880 Portage
Road. I have requested several times from your department
the interpretation of the lCBO that would support your use
of table 25-S-1 Uniform Building Code for re-roofing. I have
not received documentation or a willingness from your
department to send me documentation.
When I obtained the building permit Mr. White asked me if
the plywood had been backed according to table 25-S-1. I
told him that it had not and that other municipalities and
counties that I have had inspections from did not require
it( Danville. Concord. Martinez, Oakland, Alameda, Piedmont
San Jose and the County of Contra Costa ). Mr. White
informed me that all of the plywood would need to be
removed. I asked if he was sure this is what the city would
require. He went into the back and I presume spoke with you.
Mr. White then told me that regardless of how I backed the
plywood it would have to be done or the roof would not pass
inspection. I scheduled for an inspection the following work
day (Monday). My roofer had evidentlY put more material on
the roof that Friday. Mr. White called my wife at her work
twice to tell her the roof would need to be removed and
called my secretary numerous times. I have requested of you
that I would no longer have to interact with Mr. White.
because of his actions and belligerent behavior toward me.
r feel that your department is harassing me and making my
task of running a small business more difficult. It is my
hope that we can resolve this matter with out having to
involve the city manager or legal counsel.
M chael Kid er
K er Roofing
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(II~~~~\~\ CITY OF DUBL.IN
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"Celebrating 10 Years Of Cityhood 1982-1992"
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City Offices, 100 Civic Plaza. Dublin. Californie. 94568
March 11, 1993
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CERTIFIED MAIL
Michael Kidder
Kidder Roofing
1455 Grove Way
Concord, CA 94518
RE: 6880 PORTAGE ROAD, DUBLIN, CA 94568
This is in answer to your letter dated March 3, 1993.
I pointed out to you in our first telephone conversation, on or about,
February 4, 1993, that the City has a responsibility to inspect the
work that you performed while replacing the roof at 6880 Portage Road,
Dublin. Specifically, we need to inspect the nailing of the new
plywood sheathing. I do not know any way of doing so without removing
the roof covering.
The second issue is that the long edges of the plywood sheets need to
be supported at 24" on center where these edges fall between the
spaced sheathing boards. You indicate that this is not required by
some communities. On the other hand Dublin, Livermore, Union city,
El Cerrito and Albany are a few of the communities that do require the
support. Section 104 Uniform Building Code provides that additions,
alterations or repairs may be made to existing buildings provided that
the addition, alteration, or repair conforms to that required for new
structures. Table 25-5-1 requires the face grain of the plywood to be
perpendicular to the supports and indicates the maximum span between
supports. Item 5 of the table indicates that the maximum span for
plywood having a span rating of "24/0" is 24" and Item 6 of the table
indicates that the plywood with a span rating of "32/16" may have
maximum span for blocked edges 32" and 28" for unblocked edges. The
span rating is stamped on the plywood and an inspection will determine
which item of the table applies.
Where the long edge of the plywood falls between the sheathing boards
the face grain is not perpendicUlar to the support. Therefore, based
on Table 25-5-1 supports must be provided for the plywood in the space
between boards. These supports may be spaced at 24" or 28" on center
depending on the span rating of the plywood used.
I explained to you that where the long edge is not supported this
could be corrected by slipping a block of one by material between the
rafter and the plywood from the attic side rather than removing the
plywood. You proposed that you would submit an analysis by a engineer
AClministration (510) 833-6650. City Council (510) 833-6605. Finance (510) 833-6640
Code Enforcement (510) 833-6620 . Engineering (510) 833-6630 · f
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Michael Kidder
March 11, 1993
Page 2
showing that the blocking is not necessary. Your engineer needs to
know the thickness, and span rating of the plywood and the maximum
space between the sheathing boards.
In order to put this problem in perspective, a stop Work Order was
issued on January 28, 1993, because work was started without a
building permit. That notice included a notation that roof covering
was to be removed in order to inspect the nailing. It did not include
a detailed description of how much to be removed since this is
normally left to the discretion of the inspector. On January 29,
1993, you obtained a building permit and you were appraised of the
concern for supporting the long edge of the plywood, and were given a
copy of the enclosed handout showing an acceptable way of installing
the plywood.
On February 1, 1993, the roof covering had been essentially completed
without an inspection. You were then given a warning Notice
indicating that you are to remove the roof covering for an inspection
and to support the long edges of the plywood. Again, a detailed
description of the removal was not given as indicated above.
Compliance was indicated to be done in ten (10) days. The phone calls
were an attempt to determine when you planned to correct the
situation, but you never returned the calls. since you did not
respond, complaints were filed with the contractors state License
Board and the Better Business Bureau. with regard to the phone, we
have two numbers; 689-2341 and 838-7027. Which number do you prefer
that we use?
As I said before the only way I know to inspect the plywood nailing is
to remove sufficient roof covering, at random locations, to show that
the plywood is properly nailed. In our phone conversation of March 8,
1993, you asked that I clarify what "remove sufficient roof covering
at random locations means." I estimate the roof has about 22 squares.
Therefore, I think removal of the 10% of the covering should be
adequate. The City will accept exposing seven (7) 4 x 8 sheets of
plywood, in the presence of the Building Inspector, which is 224
square feet. One sheet should be exposed on the east, south and west
side of the rear hip roof wing of the house. One sheet should be
exposed on the rear of the main roof and two on the front of the main
roof. Three sheets should be near the eaves and the remainder may be
near the ridge. Ideally, there should be 33 or more nails per sheet.
If more than 4 nails or 10% of the nails on any sheet are not properly
installed, an additional sheet shall be exposed. An additional sheet
shall be exposed for each sheet failing to pass. On the other hand,
if less than 4 or 10% of the nails are not properly installed on each
sheet the work will be accepted. Also, if any plywood is damaged by
careless workmanship the plywood shall be replaced.
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Michael Kidder
March 11, 1993
Page 3
I have explained how the code applies to re-roofing. If you have any
questions please call me. Please advise me how you plan to correct
the unsupported edges of the plywood, and when you plan to arrange for
inspection of the plywood nailing as outlined above.
I will appreciate hearing from you by March 22, 1993.
,/~~z:, 3(:,--?72~0,('~
Victor L. Taugher
BUILDING OFFICIAL
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Enclosure: Table 25-8-1, 1991 UBC
Handout - plywood sheathing
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KIDDER ROOFING
510 838 7027
P.(ll
K :t DOER ROOF':r N1t5
P.O. Box 961. Danville. CA 94~26
:l.4~;j:;; {3i"'C.)V~~ !;'Ie:ty, COI'Kot'd CA 94f;5h'3
Phone (310) 838-7027 State Lic.n.. Number 609607
.h\f"l(;~ ~l '! :1. (rt?~~:
mJCJF I N[3 PF<:OF'C)S{iL
Vie: t; tJ ,,' T' ,~\ l.,( Fl h li:. f'"
Bwilding Official
C:i,'I';y I~)'f Dublir1
Dear Mr. Taugher ~
I respectfully ~equnffit to m.et with city ccunB~l. A~ you
r@qu..t.d I h8ve &ubmitt8d ens1neering ~epb~t. dn th~ re-
roof at porteg.. I hays 51&0 submitted rough draft analysis
of the hand out p~bvided by your dep~rtment.
'1J' ~t;' ,^: Y
], 1 lOR f:? 1. ,:' i d cI ;;~ 1'"
~~~d ',"'r' nl:)o,f ins
. .
,/
K.ER ROOFING
510.8 7027
P.01
\.. U TH ER,. CO 1JON f<..,e 5\ De t-.l.c..e
Gi 1380 FO"- TAG E. P.D,
tJLJBL-1 t-J/ (A 94-5'-8
~oo~ eY Klt/Deta RtxJPIN6
MARle c. C:rOODMN4/ p.e.
c\VlL ANo A~CH/T~CWf!..AL.
fSN6INf!EI<-/ WALNUT (ft.eEIZ
All.,OW ~~L E._ 611J:;tt:___.,~P~Q P,8rz NAJ L
Bd tJAtL L -=- Z'/z.u 21/z II
/
D\AM t;"rf:'p- (e.t) = . \3\ 1\ -- '/'2. ij Pt."<WO
_It! ~/C..lf' ~Hr6
j It Ac..:ru,A.L... PetJeRATIDt-t
IN f'AFTe~"*
MIN. Pl5N8TJt.A.110N FER- TAf}LE. ;Z~.... 6- (use. 191) "
I 1/2.. I! -- C.O~e.~fOf...lr?~ TO It DI^t1eTeF--~,
TA.eULA.eo ~ox/ OF 78 ft: 1<.~'<.,Ull<.E;~ 11/2 u Pf.f-..!,
MIN. At...L.OW.Ae'I.-f;.. peN. pe:f?.. l.JtJC STDS ~
~. ~b~ <P ~ 1/2...11
... ItJ;?;TALLAT'ON PF--OY u;:qe.G 110fl..~ n-fN--L THe
'I~A~e t'iIN I~ UM Ii rer'JB.'TlZ'-A110t-J", 6W Nor
e....!oU6t\ 'TO pef<.M1T use of THe: PULL
~H~ CAPA C'iY OF TH"e. N.AlL.. t-JAl~
M L.t !:.,T iH e.~ F'~ e. & e II PF;,.1- ~Aru f) II,
~Tf4.AlGtrr'.... L.lNe lr-Jffif(:.f'VL.A"M Ot--l ref<.. Uf}C STD5 "
, l <p::;: It)(. ( ~ I II ~ I, 44 "
t. #/1 ~ 78 # X ~ 54- ~
I " X
Nore THA.:'r F~(.?Ft. PtAPH ~MS l1-te ALt.~DW--
~L.e t.o1AY f?6 \NCMA,!;teo 30%' (t^~t"f~
2 $' - Ci I" NoTe 2.)
:. Au...-oW^~I-e: reF'- & d NAll-
= IJ4 x \. ~ = 70 4l=
'* T\.-\B wee STD;; DeFiNe peNeTRATION ~
At? 8eIN0 IN lHe t-1eHee:p- HoL..D tNG '.1:;>;--... p'),"~"<~}~h
Tl1'e POrNT: ~NCE.. ~ bd "'AlL. OI2JVe:N. "<~~ !j$l;~IJ~~;:/"
m~u ~HTC1 WIT110UT t<=,A;,~ 5~ 'N()tJt.O "-<:."~"~;. :,::'"
~ ~ T I \I,~ II @N is \
WN:? CON~loeR~D -H~~.
-~-
SI/.c"EI v. I
,'"
.
KIDDER ROOFING
.
510 838 7027
P.02
r
L-UTHfR corrON ~~lDENCE;.
10860 pO~I.A6e p...p.
DU~LI""ll CA q4-5C76
~OOF BY KIOC'ere.. f{,ooFI N6
MAFtle. CI ~OOPMArJ/ ~e.
CI VI L-- AND ARCH I rr.c:ruf'!..AL.
e~C1lNe~~1 \NAl-NUT cRai!<...
ALLOWAP.?L.E:. 5H EA~ pel<. FOOT
FOfZ- ~t)(K DIAP~~,Ac,t"1
......_-"""-...IM(....,--...,..--------~
U8C 191,. TAf?LE zt? - .J.. I
tJG-.~ATe AL.LOWApL.E. ~E..CAu.se OF ~
o ~et?UC6D peNsn<..ArloN (11\ / Vf? \Yz.\-1)
o INc-ft.e^~W NAIL- c:,PAc...It-{G (e,'j V5. (0")
f'LYWCOD 4~OUP '. C~-D + orHe~~s
pNJeL CON.F(GU~ATtaN ~ CASE I
NO~MI\t... ALGO W Ae>LIS' FOp:...
UN~l,..OC~e"D OlAFHf!-AGK 240 #/fT
De - FZA -rED AL..W W AJ5 Le :
I II (fl't'WC.
z40'Fr)' W;X en -= 120 J /FT
HltJ
/" I7tAPH-f'AC:1M N;.fUAL ALl-OWf\e'L.e,;; 1'20 ~Fr
NOTE.. '. "Hl~ VAl-UE ~Xc...E.€"D$ n'1a..
ALt....OWAbL.6 sHeAr-l.. of e.X!<i>TlN4 WAL\..,..S,
pLA~r~F- 'AJA.lA.~$ q-OOO F~ "75 #-/rT
UNeLOC~<.eo Gr'Y~ .e>o. &ooD PO~ 100 :tf/PT
lH'e~po~ / ~VE:N u= T~ie ROOF EXPEf<JEENc.EO
A L-ATE:f2-AL. L.OAD OF' 120 ~/ FT/ lHe WALL~
W{}UW be. Cf<.l n CAL / T~ieY
WoULD f:le UNf\f?L,~ TO ~eff.~
THI5 sHeAfz.. TO THe fO uNDAi1 oN.
,. , l<OOF 15 Of<...
~HeBr y. 2.
.".'
KIER ROOFING
.
51121 838 712127
P.12I3
L.U~ corrOJ fl:.,ef:71 O~ce..
~~eo FO~rAGe ft.D.
t?UBLIN) CA. '94-~"e-
~ l;y k..(~ r<.<OOflN.C:f
t1A.r<-tB C, 6000t'1,AN/ P: e..
CJ VI L ,AND .Af2-Qi (nu..fU ftAL
eN G, IN Et:f?- / WALNUT c.,p..~K
Al'JALY?I~ OF t?eFLASCTION Of
_fLY WOOD ....~^. ~t:.~.,,~,~ca~~'J:.~~~~~OE,~UBL~
fffr<..UCTUru\.l., Pr<.OP~F--Tlf:h OF rL.YWO A~e fraotvt',
II PLYWr? t?~~\6tN 9pec,lPl CA 110N It PU~L.lsHeo BY
11te ,A.t1e~c~ Pt...ywP Ae5lN.
~Er'e:fl..eN~ IV THt5 Af'e MA~SO: PD~
PL YWo IN<? rA~ e..o wI FAce.. (:1AAI"J ..L (<AFTeR~
LJec- rAe>l...G 26 -$ ... I
FO(l-. 1'/?'2H P-L,..YWP wi t7pAN F-AT1Nc, ~fP
MA.X. Pt-YWO 5PA~ FOfl. ~o~e.e; UN&LOCf<..f...O
I So ze, ".
~Ar-:'T~R~ t;,ACf5.D 2411 o,e. I 24-'. < 26U, oK.
NO TE- T KE. ON l-Y M e..M f) e-~,,:> S;UPfoFtT I t-J 4
--~
nte PL..YWD WHt CH A~e CAPAf?JL-e. OF
CA~RY'N4 G-f<..AV1TY LOADS t\~D Tf4NJ'5F'~~~tN6
TH~M TO onte-~ sTFLlACrUR-AL..- ~.'-e-MeN~ Af:.€.-
TH-e f-AFWr<.S. THe.. \x ~~ ~e NOT
9T~uc;rufLAl- ~UrPD~Tl W6 M ~M~~"",
A~SUMPTlot--J~ MADe f;O(<!.. Twe ~OLLDWfN4
ANAL..Yc; t~ (Au.. AtGe ~~efZ.VAT\Ve.) :
· A zoo ~ MA}.J pure 0tJE. r;Ot'r DI~CTLY
OV~f2~ A (pfl WiDe bl\P ~"iTWt BOAf'.f?5
· TH-e, PL...Y\NP'19 r-...%UM6P
11::' Ac-r ^~ A c;,lM PLY -
~uPPo~"'eo ~AM \N<;fePD
Q= At;, ^ WNTINUOU& C?EAt1
-me.. LOAD.... DISml eU11l'4(:,
t?e,t--j CfJ-PlT OP ,H-'e ~OOF-' N'T
~'3 Nee} L.eOTED I
",.
.
.
KIDDER ROOFING
51121 838 712127
P.12I4
\"UTHgr<. corroN. R-e'i>lDe.Nc:E.
G16eo PO~TA!16 fU;'.
PU&LlN, CA 9#~
{Za?F f.?y l<l~ ~PlNGJ
M AR.I e c.... C:{OOt?f-'\AN I ~ e..
~Vll,.... A\-Jc;> AF.ct-Hrec.ruMl..-
e.N6lNe~~.1 WALNUT Cf?..€.6t<..
pt){V-JO
ftAT\N6 "
~2./,(g
..r~-~ 41 ~Hee.r of PL.'1'W~,_lWIDnn-l
W l/z \1 PL YWD
(AC:ruAJ... THK IGJ !}2")
I
/
/
r~'-' -7 ' --
E)( '2)(4 rz.APT~ .-~-
(Gl...OP{; NOT ~HOWN)
S~~TI'O'~
X" ( X 4 ~I~\P
~Hre, t!1 IZ II (J,c..
(PULL. r;ecrtoN)
A-~A
I" ~ I,_otl
WOf{,!;f- POS9'f)L~ - CASE, LOAolNct v-
t.>eF'LECll0t...J
, ""'"" --_........~.....,..........'-"'--
U?CA11oN
OF- LOAD ~
M?~edD
'e}'( (.\ TY
Cf= oUeL..tN
6 leAt4
b
r..l\ODf'::'L. ~
~OO ,jf
Clu -z..
c..o~~~\J.
c,e;C-litN tw10DULU~ cr PLY.:
. ~hfl. OZ')(f'9/~21')~
S. =" ~ ';::;,. _-...""._~),I.",I-
~ ~
'= O. 705 jrl~
LI~~ \9 ' -+
!:: ~ ~ ~ ,7fY7 x. .I A.. ~ o. 2:09 lr")
, 12 r,.1T
..
.
.
KIDDER ROOFING
510 838 7027
P.05
LUTHef?, C01~ ~OE"')-4~
f.oekPo pop..rAat:- p.p.
t/U~\...IN I r.:..A. ~~~~e
~F fbY Kt~~ F-Q:JFlN6
M~e c.., qt?Ot;t4AN/ F: ~.
C-tVlL ANO Ar-cH I TECrUAAL.-
~~INee:fZ...1 WALN.Ur ~ee~
D~FL.~C"'Ot,J I CONT'o
p \? (lOO~)(h tn)~ II
A;:. -4'h et.--;:: 4~ (1:"b..X'IO'~ t\;I,~~:ZO-9 in+) ; ,OOOO?3
P05 TA6>L..E, ~ ~r;,C.(t~ ~RoUP 'I 6~De... GTfZfZ.%
./
LeVeL. t?2. / ~y use -- FOI< t/6.~IN~~ E-
,.. nte- 9~c.nON Or ~ f\..'(v..JO l~ C;,O
9MAlJ.... IT ~Nor ~ MMA?UFtt3f7 IN
r<.-eAL l..t Fe. .
11~'\5 IS e>eCAU?e- CY THe.. ~Tfl...eMl?:.L'(
9i1~T s.pN-J.
~ APpL.tEO l-lV6 L,.t;1AO F~ot-1 THe. 2.00if.
MAN 1& ~o..UIVA~f;NT TO
1% :,~:= '2.00 '0/ rr2- I
~A~ IN e.XWG$
Of THe 3;; *'/ Fr"2.
IN. TAtbLoG
2? - S- I ·
DGAP t...o AP - ~Ff 6l +- PL.. YWr::> ON 1-'(
4- f"::;P + /. B PS,F
~ UGH- \...~ THAN \....\ Ve. t..-OAD /
CONW.Jl?t.rnoN TO A lG
N eq L..\ a I e \-e...
.
.
CRITIQUE OF CALCULATIONS PREPARED
BY MARIE C. GOODMAN P.E.
Sheet V-l
The minimum penetration for 8 penny (8d) nails is 1~" not 1~1I per
Table 25-G. The actual thickness of 1 inch nominal boards is 3/4"
therefore, the actual penetration of an 8d nail into the supporting
rafter is 1~ inch and meets code.
Sheet V-2
The calculations are based on the assumption that the nail spacing for
the roof is 8" on center. This needs to be verified by inspection of
at least 10% of the plywood.
The allowable shear values for the existing stucco walls 15 180 l#/ft
not 75 as shown in the calculations. The interior walls which have
gypsum board on both sides are capable of 200 #/ft for wind loads not
100 plf. Therefore, the conclusion the roof is stronger than the
walls is not correct and does not justify reducing plywood nail
spacing to some unknown value.
Furthermore, these calculations do not take into account wind uplift
which is far more critical than lateral loads.
Sheet D-l
The calculations
rating of 32/16.
to be verified by
rating of 24/0.
assume the plywood thickness is 19/32 and has a span
The thickness and span rating of the plywood needs
inspection. It is probably ~ inch thick with a span
Sheet D-2
The analysis calculates the deflection of the plywood spanning the
space between the boards. The space is shown to be 8~" in section
A-A, but calculations are based on 6". The actual space must be
determined by inspection. The calculations use the wrong moment ,:f
inertia and modulus of elasticity.
The fOllowing are the correct values for the assumed plywood grade and
the probable plywood grade:
Moment of Inertia
Modulus of
Elasticity
.209
Correct Value
For Assumed
Grade of Plywood
.01
Value For
Probable Grade
of PlyWood
.004
Values Used
1,800,000
1,500,000
1,000,000
The correct values will result in a larger deflection.
The calculations do not address the lack of support of the long edge
of the plywood.
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"l<~gal at the time of adoption of the ordi-
{Jiiance codified in this chapter and provided
'C.. uch continued use is not dangerous or
bstandard and does not menace health,
~. ~. .
:.life or property.
,~'fr:B. Electrical, plumbing and mechanical
,," IDS installed in apartments, hotels and
"ellings and in existence prior to January
.J ;'1975, shall be deemed to have confonned
?~r{applicable law in effect at the time of
,~::insta1lation and to have been maintained in
~go& condition if currently in good and safe
Condition and working properly. COrd. 12.
...""11... _
~,~ l:'Ord. 21-89 ~ 11.8)
1<~~ .'~
Maintenance
. requirements.
lA. All buildings or structures, all electri-
... ;:p1umbing and mechanical installations,
"'"'ih existing and new, and all parts thereof
'~l be maintained in a safe and sanitary
It" -
cO,odition. All devices or safeguards which
.~.. ,required by the building, electrical.
iimbing, and mechanical codes when the
.> r.1ding, structure, or installation was erect-
~._.
~orinstal1ed shaH be maintained in good
h~~g order. The owner or his designated
,..t shall be responsible for maintenance
~~~ building, structures, installations or
m.
,~~> Private building sewers shall be
;,~tained in a gastight and watertight
'i.'tion. Where private sewage disposal
are permitted, the effluent there-
~. ,~11a11 be Contained beneath the surface
~)~rOUnd level and within the property
>"f;~~f the premises. COrd. 21~89 ~ 11.9)
7.28.120
7.28.140 Alternate materials and
methods of construction.
A. The provisions of this chapter are not
intended to prevent the use of any material
or method of construction not specifically
prescribed by this chapter; provided, any
such alternate has been approved by the
Building Official.
B. The Building Official may approve
any such alternate provided he finds that the
proposed design is satisfactory, and that the
material, method, or work offered is. for the
purpose intended, at least the equivalent of
that prescribed in this chapter in quality,
strength, effectiveness, fire resistance, dura.
bility, dimensional stability, and safety. The
details of any action granting approval of an
alternate shall be recorded and entered into
the files of the city.
C. The Building Official may require
that sufficient evidence or proof be submit~
ted to substantiate any claims that may be
made regarding its use. (Ord. 21-89 ~
11.1 0)
7.28.150 Modifications.
Whenever there are practical difficulties
involved in carrying out the provisions of
this chapter, the Building Official may grant
modifications for individual cases, provided
he shall first find that a special individual
reason makes the strict letter of this chapter
impractical and that the modification is in
confonnity with the intent and purpose of
this chapter and that such modification does
not lessen any fire protection requirements
or any degree of structural integrity. The
details of any action granting modifications
shall be recorded and entered in the files of
the city. COrd. 21-89 ~ 11.11)
357
E-XHIBrr 1
.
.
RESOLUTION NO.
- 93
A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF DUBLIN
APPROVING A VARIANCE SO AS TO WAIVE THE INSPECTION OF THE
NAILING OF THE PLYWOOD ROOF SHEATHING AT 6880 PORTAGE ROAD
WHEREAS, Michael Kidder, Kidder Roofing, 1455 Grove Way
Concord, CA 94518 has requested a variance to permit the installation
of a new roof covering at 6880 Portage Road, Dublin without inspection
of the nailing of the plywood; and
WHEREAS, the City Council of the city of Dublin did hold a
pUblic hearing on this matter on June 14, 1993; and
WHEREAS, the city Council does find that the granting of the
variance is ,consistent with the intent of the code and will not lessen
the protection to the people or property within the city because an
engineering analysis indicates that the assumed nail spacing is
adequate.
NOW, THEREFORE, BE IT RESOLVED THAT THE Dublin city council
does hereby approve said variance subject to the condition that
written approval of the owner of 6880 Portage Road accepting the roof
without inspection be submitted to the Building Department.
PASSED, APPROVED, AND ADOPTED this 14th day of June 1993
AYES:
NOES:
ABSENT:
ABSTAIN:
Mayor
ATTEST:
city Clerk
EX.' tJPQf'V It)
.. ~~~~,~
! !"
.
.
RESOLUTION NO. - 93
A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF DUBLIN
DENYING A VARIANCE TO WAIVE THE INSPECTION OF THE
NAILING OF THE PLYWOOD ROOF SHEATHING AT 6880 PORTAGE ROAD
WHEREAS, Michael Kidder, Kidder Roofing, 1455 Grove Way
Concord, CA 94518 has requested a variance to permit the installation
of a new roof covering at 6880 Portage Road, Dublin without inspection
of the nailing of the plywood; and
WHEREAS, the City council of the city of Dublin did hold a
public hearing on this matter on June 14, 1993; and
WHEREAS, the city Council does find that the granting of the
variance would lessen the protection to the people of the City of
Dublin and property situated thereon, and that the granting of the
variance is not consistent with the spirit and purpose of the Building
Code.
NOW, THEREFORE, BE IT RESOLVED THAT THE Dublin city council
does hereby' deny said requested variance.
PASSED, APPROVED, AND ADOPTED this 14th day of June 1993
AYES:
NOES:
ABSENT:
ABSTAIN:
Mayor
ATTEST:
City Clerk
EXH;Bj~r II