2522 RUCKER AVE 2018-01-01 MF Import

/ . 1 wdl intersect \Vhne the roof alopes wwud a panpet at slopes uenotrnnceaiedwithinbuildingmnsvucdon�ssembliuneednot peater Nan 2 uuits venical in 12 units horizonul(16.796 alope).the be enclosed. puapetshallextendtothesameheightuanyponionoftheroofthat ��nclosuiesshallconfortntotheapplicablepiovisionso(Sec- is wiUtin the disunce wherc protection of wall openings would be u� �ppy mquired,but in no case shall�he height be Iess then 30 inches(762 In one-and two-story buildings other than Gmup I Occupancia, ��' gas vents,ducts, piping and factory-built chimneys which extend through not more than two floors need not be enclosed,pmvided!he Q■ In a townhouse building having a"zero lot line"be- openings around�he penetraGons are fire s�opped et uch floor. ■ tweenuni[s,weare.requiringaone-hourfire-resis- E7(CEPTION: BWguvenuinsulkdin�ccad.ncewi�hMeiNisi• tive exterior wall per Table 5-A. Section 709.4 would also re- 1°g' quire a parapel, unless a listed exception is used. Gas venu and factory•built chimneys shall 6e pmtected as rc- Can Ezception 5 to Section 709.4.1 be applied to this condi- quired by the Mechenical Code. tion? Wells containing gas vents or noncombustible piping which psss through thrce floors or less necd not provide the fire-resisUnce rab A■ Section 709.4.1 requires lhat parapets be provided �ng specified in Table 6-A for"shaft enclosurcs,"provided the an- • on all exterior walls of buildings, unless they meet nuler spece around U�e vents orpiping is filled atesch floororceil- one of the five exceptions to this section. ing wilh noncombustible materials. EXCEP7'ION: BWguventsimrolkdinaccoMancewitl�theirlist- Exception 5 provides designers with an altemate to required ;�g. parapets. This exception utilizes construction similar ro that specified forarea separation wallswhich are built without par- Openings made through a floor for peneuations such az cables, apets under Section 504.6.4,Exception 2.It establishes consis- ca6ie trays,conduit,pipes or tubing which are protected wilh ap- tency between code requirements. proved through•penevation fire stops to provide the same degree of fim resis�ance as the floor conswction need not be encloud.For floor-ceiling assemblies,see Section 710. Q■ A parapet is not needed on an ezterior wall that ter- ■ minatesataroo(oftwo-h�urfire-resistiveconstruc- �� pleaseclarirytheintentofthefi(thparagrophof5ec- tionorataroofconstructedentirelyofnoncombustiblemateri- ■ tion 7113 as il applies [o products-of-combustion als. Would this require the entire roof to be protected as �ents in buildings of three srories or less. described or would protecting a certain ponion o(said roof comply with the intent of the code� A■ The intent of the fihh paragraph of Section 7113 is ■ to allow gas vents designated as Type B,2 by 4 or 2 A■ Exception 4 lo Section 709.4.1 permits omission of by 6, ven[s to be installed within a 2 by 4 or 2 by 6 stud wall ■ parapeLson roofsoftwahour(ire-resisliveconstruc- with studs spaced a[16 inches(406 mm)on center,and also to tion or roofs constructed entirely of noncombustible materials. allow noncombustible piping within the wall to pass through In order to apply Exception 4, the en[ire roof must be of (loors.BW gas vents may be installed within walls if the listing two-hour fire-resistive construclion or be of noncombustible allows this. wnstruction. Generelly, stud cavities are not considered shahs even though they may pass through a floor,as in balloon•type fram- SeCdOflt 711.1,711.2 end 711.3 ing, and have fire blocks only at ceiling lines by construction as set fonh in Section 708.2.2. The integrity of the fire stop is 711.1 Genenl. Openings through floors shall be encloud in a maintained by the construction of the vent or the noncombus- shaftenclosureoffire•rcsisuveconswctionhaving�hetime{+eriod tible piping and lhe fire-stop spacers that are required at the set forth in Table 6-A for"shafi enclosures"except es permi«ed in �eiling or (loor penetrations. Since the stud caviry under the Sxtions 7113,71I.5 and 711,6.Sa elso 5ection 304.6 forshafts in �onditions stated above is not considered a shah,openings into Group B Occupancies,Section 306.6 for shafts in Group F Occu- ��e stud cavity are not required to be protected as specified in pancies,Sations 307.6 and 307,11.23 for shafu in Group H Occu- ��ion 711.4 and the stud cavity need not be extended to the pancies,Section309.6f'orshaRsinGroupMOccupanciesandSec- roof. Typicalezamplesofgasventsinstalledinwallsarepro- tion 311.6 for shafts in Group 5 Occupancies. vided in the Ill�shated Mechanical Manual. 711.2 Extent of Enclosures. Shaf:enclosurcs shall extend from ■ Is it a�propriate to require dampers on supply-and the lowest tloor opening �hrough successive floor openings and �■ return-air duct openings (or shaks constructed as ahall be enclosed at�he top and bottom. illuslrated in Figure 7-4� EXCEP770N5: I.Shafu extending N�ough or ro the underside of �he'oof sheathing,deck or sleb need no�be enclosed at�he top. A � Essential ly,you are asking whether the schemes in- 2.Noncombustible ducu,vents w chimneys uud ta convey vapors, /�■ diCa[etl in Figure 7-4 meet the intent of the code dusuorcom�usuonproeunsmeypenecramuieenc�osumsuhebonom. �yithoutprovidingfireandsmokedampers.Thefigureshowsa 3.SNRa nad not be enclosed a�the bonom when pmeected by firc three-story building with all of the air-conditioning units for dsmpm conforming to appmved rccogniud stsnduds,installed et�he each of the floor levels located on the rooG The shah construc- iowes�noor ieve�wiwn�he swR mclaum. tion from the airtonditioning unit down through the Floor level Shaft enclosures shall be rnnstructed to continuously maintain in question has no openings into it from any(loor level except the required firc-msisuve integriry. the Floor level whith it is supplying.Since no intercommunica- tion of the various floor levels wou Id be created by this method, 7113 Speeial Avvision. In other than Group i Occupancies, there would be no need for the installation of dampers in the openingswhichpenevateonlyonetloorenderenotconnectedwith individual air-conditioning shaRs, despite the requ(rement in openingscommunicaGngwi�hotherstoriesorbuementsandwhich Item 3 of both Sections 713.10 and 713.11. 62