HomeMy WebLinkAboutJOIST LAYOUT & DOCS - 07-00061 - 1076 Green Willow Dr - New SFRINTERNATIONAL CODE COUNCIL
PO BOX 50220, IDAHO FALLS, IDAHO - (208) 612-8271 or (208) 782-3180
2" X 2" FOUNDATION WASHERS IN IRC
Section R602.1 1.1 of the 20Q3 Intematianal Residential Cade (IRC) requires the use of a minimum �/.� inch by 3,
inch by 3 inch foundation sill plate washer in seismic Design Categories Dl and D2 and Townhouses in Seismic
Desiga Category C_ However the 2003 International Building Code SSC) allows the rise of a 3116 inch_hy 2
inch by 2 inch plate washer in all Seismic Design Categories D and E by Section 2348.1.2.8. From the 2000 TRC
Commentary and the 2003 I.BC Structural Q&A Application Gude we find the reason stated for the 2x2 washes
was to compeasate for the common construction practice of over sizing bolt holes up to 1/a inch.
The AF & PA 2001. National Desip Specification Section 11. 1 used as a referenced standard in both the
2003 IBC and IRC slates khat such a sill place bolt hole shall be a m�.mum of X116 inch larger than the nominal
bolt diameter. The larger -square washers enable the nub to apply enough camping action between the szll plate
and foundation to prevent longitudinal splitting of the sill plates and loss of lateral load capacity. Cyclic testin�
after the Z994 Northridge Earthquake was used to verify the 2x2 washers were sufficient to prov�de the added
surface area needed. This only works though if the Hofs are tightened sufficiently.
In the April 2002 ICC Code Change Hearim-1-S tie Building Seismic Safety Council Cade Resource Support
Committee (BSSC-CRSQ submitted Code Change RB82-02, This change added the 3x3 xequuemenf to the
2043 IRC. The reason gives for the code change was to correspond to the 2000 NEB_RP Section 12.5.3
recomnending closer spacing betwee_n braced wail lines. No data was given to suagesi the 2x2 washers were not
sufficient as used in the IBC. N.EHRF is sunilar to the old 'It's oza.Iy a recommendation" code pub out by STD.
On February 17, 2005 the Snake River Chapter of the 1utemational Code Council mit and reviewed the above
information. The members present voted to recommend the use of the 2x2 IAC camphant washers in IRC
applications under IRC Section R104.11 Alternatc Methods of Construction. The 1/16 inch maximum over
sizing of holes w� siail�. be required or the 3x3 washers will have to be used inDesipCat�gt�ry D. The use of
2x2 washers in Design Category C fox 'f� inch oversized holes was also recommended as ars option to replacing
the silJ. plates. Also, the 2003 TBC Structural Q&A Application Guide does not recommend countersinking of
foundation sill plate anchor bolts without an eng7neered design accounting for the reduced in -plane sear.
le albove information i's on1
Sincere
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Codes _# Chai'rman
Snake River Chapter ICC
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Adeline and does not sunercede the local Buildm`
Officials authori
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nergy Certi cations
I ne-rfTv' Conservation Code CC
Internationa JL SY ff
As per scctionl 02.5 (MCC) all insulatzan �taEed shall have a coi-tifeate zssued.
The curdf c at e s haH b jt.=.v s I'p e d and dett d Ii'stzng the ape aid manufac ta 17 tr of th eh
msulation instalt�A The installer - shall also pro'Vide the initial lhstailed f_fticknesS,me
settltd thZ.cka.ess* the coverage a:rC_1.a and the number of ba�s insta1led-fQr blown or sprayed
�xzs�.��d UISL11 floors,, and -
insulation. �Nlere blown -in or S-Draytekd M'sulatio walls
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��.ea certification of the �astalled dcnsi-,Ly andR-
cathcdrdt cciliii�s ��a�I��r shall pro��d�
value... This certifiC.-atc shall b.;2N. posted In' a conspicuous place on the job sit(,a. •:
RQof/eeJJin� insulation
Ro.of`c� cr �nsuIafian that is blown -in or sprayed shall be identifiud by thi6kn_t--_,Lss
markers that ars iabeh:�,-d m' inches or Ihc,,rs installt,-2,d at least one for evLry-1300
square feeL throughout the atbic. The markers shall :'L'ace the access, bz affixLd to the
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-ffi-iolmess and MUM
ists and marked 'th th, i-mmmum iratial i��a��e���se�
orjo Nvi
settled tlaickness with numbers a �nimum of F"' "n hez%vhi
Windows, doors and sVfights
indo ws and doars aiad skylights shad. aJJ be gm' ac c orda-ac, c with NT'RC 1 0 0
by' an accrechttd, iUd.c�pendent laboratory, and labEled and ctrtified by the manufacturer.
Solar Heaf Gain CoefnczEknt (SHGC} of glazed R��nzstraton product's (windows, glazcd
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doors,, aid skylights) shall be deternained IAW NFRG 2 0 0 The label shall be affixed to
the item sliow-mwQ the U- factor- Where the label is not afT ed.and the U factor cannot be
dete�.n.�d Table 1 02. 5. 2 ( l ) or 1 02,5_2(2) (IECC) shall be, used as a default -
Ducts
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Duct insulation whtn M'stalleltd inattics or outside shaH have at a
num=m-i R--11 for supply and R-6 (R2 zn unconditioned are for rcat=s as per Table
.5��.3.3.3.All ducts must bc� scaled.
NV�Lter Iffeaiers
Heat traps are required and or M'sula-t-Jon ptr T`abl<� '03.3.3.1
Hot Water Recirculativa Svstems
HOA Water Recirculating z5ystem Piping. shall have Pipes insulated M accordance
,�Aeffi Table 504.5 and Section :5033.3.2 and have a manual shut off Bar -when system i's
not in. use.
Li,c;hting
All commerciij-J EL�htL`na must comply .fh th4%=..i, IECC. AH rooins zn rooms -with 2
or more fixtures must be switched for bz Icve1 lighting.
Sum m-ary
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Cextifcations from z�xstal�.er posf:ed onjob site amici e. -Il
must inet energy calculations tumod
m -with plaus.
U-_facior must be oxo door, vv_M*dow,, a-ad,skyT_i-.c,_Fht at ��t of in ptctian.
D-uct insulat�o_n z�.accordance -with T'abIct-t _-5- 0 3 _ 33.3.0-atside R I I supply -P,6 return
Tnsi'dL unco_ncHf,-io:a,---A-d spac� RI. I s�ipply R.2. retum. Ducts must b(n,� sealed..
NVater heaters io us.P.L heat taps or Insulation. Rf�,Lcirculating systems must have a
can-ven-lieut Shut off aD-d bu insula -ted.
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