HomeMy WebLinkAboutOrdinance 1727 N.C.S. 08/01/1988
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SEP - 1 198
ORDINANCE NO. 1727 N.C.S.
Introduced By Council Member Seconded by Council Member
John Balshaw Jack Cavanagh
AN ORDINANCE REQUIRING RETAINING WALLS CONSTRUCTED WITHIN
THE CITY .LIMITS TO COMPLY WITH THE FOLLOWING REQUIREMENT
OF MATERIALS USED AND HEIGHT. MODIFICATION TO SECTION 301 (b)
EXEMPTION NO. 5, AND SECTION 2516(C)10 OF THE
1985 UNIFORM BUILDING CODE
1. Amend Section 301(b) , Exemption #5 of the 1985 UBC.
Revised Section 301 (b) , Exemption #5 shall read as follows
"Retaining walls which are not over two (2) feet in height measured
from top of the footing to the top of the wall, unless supporting a
surcharge, or impounding flammable liquids . "
2 . Property line retaining walls may be of all heart redwood up to two (2 )
feet in height; property line retaining walls up to four (4) feet shall
be of pressure treated lumber; property line retaining walls over four
(4) feet to be engineered.
3. On-site retaining walls up to four (4) feet may be of all heart redwood
or pressure treated; over four (4) feet walls shall be engineered and
set back a minimum distance equal to the height of the wall from the
property line or foundation of the building .
4. Height of walls are measured from the bottom of finished board or top
of footing to top of finished board.
Ord. 1727 NCS
Section #3: Details for redwood retaining wall dated 3/16/88 and details for
pressure treated retaining walls dated 3/16/88 shall be the Standard and
part of this Ordinance.
INTRODUCED and ordered posted this 18th day of July, 1988
ADOPTED this 1st day of August 1988, by the following vote:
AYES: Cavanagh, Tencer, Sobel, Woolsey, Balshaw,
Vice Mayor Davis, Mayor Hilligoss
NOES: 0
ABSENT: 0
M. Patricia Hilligoss, Mayor
Attest
~~PUTY CITE CLERIC
~ ~ ~ Approved:
Patricia E. Bernard, ity Clerk City Attorney
ord .retaining .walls /bi3
ORD 1727 NCS
I,
R'ED"W0°OD RETAINfN<G WALL
2
1 P 'SOIL CONOIT,IONd.
Allorr~lo Ldatal.Boorinp
12.° ~ 20010/SF/ Fe Wp
ACTIVE PRESSU3tE
Laval;SloPe
L E V E L 6° a° = 301b /CF
I 3 2 to;I Slooo "ao=aglb/CF I
, ~ lil4° Longfh"L"
WJ '
m.J
E. :a'~" hoighf °A°
V
h/ ,~,I m 3~-0° min.
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g' NS:S.
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OPTIONAL ~~'~,`.:~i
Porf, DroimS>/sfani2% I
min. elopo to Diulgrpo ~ ~ do0ih. "d •
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1 TALE "A"
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J h~GNT DEPTH POST POST HOLE LENGTH
.f y MATERIAL NEI,ft ",d"ft SPACING (SIZE DIA"D" "L"ft ;
l
1 "
Pmnnoable Idaieriol ~ ~ ~ n 2' -6°:
- " " U W. -
~'0 4;' 6'-9' 4-' 6"x6" 19° 10'-9"
TYPICAL CROSS SECTION
J
c 1 4„
az ~ 4:~ n _
3' 4' 6°' 4' 4"x4" T6'
ROUGH 4,~. 6' 0 ' 4:' 6"x6" l6'' 10 =0° i~
' NOTEi ACL PLANKS TO BE'CALIF.RDWD N0:2 HEART OR BETTER:
• 221.2,•2x10,. or 2x9, ROUGH.SIZE.
TA'B'LE 6'
' MATERIAL HEi6FtT DEPTH PAST .POST MOLE LENGTH
"h"ft "d"Et SPACING SIZE DIA""-D" 'L"fit
c
3
_ oo In _6. Q'' 4n -
. O 2~1
H _
a z• -
a =t~IW 4'' 6"-3" 3" 6°z9n 16° 10 -3' II i~
V J'S~
..,2 i:J.
V1 Q 'd' - _
ae x. ~ 5 6.
• z u ~ 2' 3' 6 4' 4"x6°• 12• II
J W O~O • ' ' n n s n Jl--
ROUGH 4' S'_0• 6",x6" 16' g',0• " ~
' NOTES: ALL PLANKS SHALL BE CALIFORNIA REDWOOD
MERCHANT HEART. OR BETTER, 2x12, 2x10; or
. 2x_8 ROUGH SIZE,
• ,LARGER bIMEN5I0M SHALL BE PERPENDICULAR
TO WALL,
THESE, TABLES SHALL BE READ 1M CON,IUHLTION i
M A R C H ~ 6 ~ 9 H.. H WITH THE TYP. SECTION ON SH.DI.
e
: CITY J A
STANDARD WOOD RETAI(VIN:G 'WALL (DouglomFlrConstrucfion)
Z/ Size Opfionol 2~~x 10°Cbp p E' $ I G N DATA
" ~P'
Wit; 12
h, , d , ; p, , P, ,
3" 2' 4. I ~ 1 2" 4"''x 4° 6.1 '
Ptnii~~us Gra+~l \
Backtill.
3 ~ 5.1 ~ 18 4°z 4° 8'.I
2"x l2"Facing He_ighf ~h~ 4' 6.8~ 1 8'~ 4uz 6° ~ 10,8`
8ootds, Spoced,l/'2
5" 8.~ 113,° 6" x 6° 13.3`
L®~+qth L ~ ~,ct oa Bose
faln•
When wollcAjoins~Aeptwlt~~rinq;~ the bottom of he Pgrvioua
Post 4~ O:C. grov®I backfill sholl b®6 higherthan shoafn.
ACTUAL FIELD CONDITIONS ENCOUNTERED WHICH
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.y
D0. NOT SUPPORT THESE ASSUAAPTLONS SHALL
. , I .
~="tl I`' RENDER THIS DESIGN VOID. •
Clasa~8~ Concrot®: _ ~ ` I . Retained Borth, is pCOurae:Groin~d 5oif~ifh sort+e
Bod®n.g. )j ~ kiM,•'bu4 no Clcy.
r;a ~ 2. Foundbtion soil ~ oopadaofoupportinq o !ot®rol
I+' b~rinq, pressure of 200ps4 por toot o~ depth be-
s%`I ~ low gr6de.
~ I I i~ Dap4A.''0~ N 0 T E::
• • 1 1 •
a ~ I. Allmetulfostonecsused cr'sto'b®ot'ocorrosion
' ~ resiatont:,moterial~ortop qualify Aot-dipped qol-
' a `I ~ vonized Neil: and Foatentrs..
~~•,'1 2. Refer to th® Generaf Notes~for Lumberdnd
J'~ ~ Prea®rvotive TreofrtgnRSpecificotfona.
1
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•;L_~ a%~
PArvip'a'!dloteria9 r j t.11^ 4°
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Diometer
MARCH 1 v, ! X88
GENERAL NOTES
DOUGLAS' FIR CONSTRUCTION
1: X11 lumber shall be "Construction- Roiigh (Rough Full Sawn - Unsurfaced
lumber ,cut 'to full; specified size)..
2. Posts shall. be Grade :No: 1 and facing 'boards. (•lagging) shall be Grade
No..2, or better, conforming to current W,WPA* Grading Rules.,
3. :Each piece of 'lumber shall be ,grade stamped by an agency- certified by
fhe Board of Review of the American Lumber Standards Committee and
.manufactured in accordance, with. Produce Standard 20-70,, as published
by the 'Department of~ Commerce.
4. .All lumber and posts 'shall be pressure treated for, preservation in
accordance ,with. current. AWPB** standards for ground-contact use and
sha1L comply with' current Uniform Building Code Standard No. 25-12
(UBC SIDS.)..
- 5.. The. following AWPB quality standards are approved for the. pre"sure
'treatment of lumber. and posts:
- A1VPB L]?.=22': Pressure treated: with -waterborne preservatives
(-ACa, CCA. -See, Note 6`) .
- AWPB' LP 33's Pressure treated_ witfi light. petroleum penta
solution.
- AWPB'- LP-44: Pressure treated with volatile solvent (LPG) penta
solution:
- AWPB L-P-55: Pressure treated, with creosote 'or 'creosote coal-tar
.solution.
- AWPB LP-77: Pressure 'treated. with. lieav,.y petroleum
• •solvent-penta solution.
6. Refention of preservatives shall be equal. to, or. greater than,, the
minimum retention- .specified. .:for the AWPB quality standard used,
except retention of preser-vatves for pressure treatment with
waterborne presei-vafives (AIVPB Std'. liP-22, ACA or CCA') shall be
- equal to, ±or greater than, 0.60' pcf. This higher retention sh"all be
branded or stamped on the lumber..
7. Treatment of `lumber and posts shall conform. to current AWPA***
Standard'C2:
8. All preservatives must meet the requirements of the current AWPA
standards:.
9.. H'an_dling and care of ,pr,essure fr-Bated' wood producfs shall conform to
the requirements of AWPA Standard' M4..
,10. All cuts; ;holes and' injuries such as abrasions and nail holes shall be
• field treated with. applications of ;preservatives in accordance with
AWPA Standard M4.
' - i
11. 'Each piece of treated rood produce shall ,b e; ,,legibly branded, marked
or' otherwise have permanently affixed; the following informarion: 3
identity- of the treating plan and. .the year treated; the preservative
symbol; e.g:., ACA, CCA, etc.; the AWPB Quality Mark; the 1'egend,
e.,g,i; AWPB LP-,22; L?-44, etc.; the', words °GROUND CONTACT",
name .or ,trademark of the supervising Quality Control Agency;
retention, etc. 12'efer- to the specific' AWP.S standard used £or
additional.'information w:uch may be included.
i
* Western Wood 'Products Association
American Wood Preservers Bureau ~
American ,6tiood Preservers Association