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2.3Adding New Fixtures to Existing DWV Systems, Extending DWVSystems, andFr lnstalling New DWV Systems in Existing BuildingsProblem: The proposed rehabilitation, when the existing DWVsystem is without structural, hydraulic, or funetional defeets,involves any combination of the following aetivities:. Adding new fixtures to the existing DWV system when itseapacity exeeeds its installed fixtures (see Part 1.3 above);. Extending the existing DWV system when its eapaeity exceedsits installed fixtures (see Part 1.3 above); or. Installing new DWV systems in an existing building (whetheror not the existing system will eontinue in use).However, full complianee with current plumbing eodes requiresextensive struetural or architeetural changes eausing unwarrantedadditional eosts and delays to the rehabilitation projeet.Solution: All additions and alterations to existing plumbing DWVsyste-nrs should be designed and installed in aeeordance withPerformance Criteria (see Appendix A) covering the followingsix attributes of the system:
. Transport of Wastes. Durability. Maintainability. Struetural Serviceability. Hydraulie Integrity. Functional Performance
Alternative aeeeptable solutions may be found in the followingdoeuments:
Standard Plumbing Code, Chapter XVI, Section 1602--SingleStack Discharge Ventilating Pipe Systems;Southern Building Code Congress International (SBCCI) andBuilding Officials and Code Administrators International(BOCA) research reports for automatie anti-siphon trap ventdeviees; and
NBS Building Seienee Series, No. 60, Hydraulic Performance
of a Full Scale Townhouse System with Reduced-Size Vents,August 1975, for redueed sized venting design.
Appendix B illustrates typieal solutions whieh will eomply withthe Performance Criteria under most eonditions of operation anduse, based upon engineering analysis and interpretation of testresults.
Diseussion: Single staek DWV systems, even when fully eomplyingwiTh-The Performance Criteria, are not reeommended in locationswhere building drains are subjeet to flooding under normalconditions.
2.4Through-theWall VentingProblem: An existing DWV system, an addition to an existingDWV system, or a new DWV system in an existing building mayinelude through-the-wall rather than roof venting. This eondi-tion, whieh may be determined by inspeeting the building orexamining existing and/or proposed plans, is likely to be pro-hibited by the local eode.
Solution: Through-the-wall venting should be aeeepted in theT-ottowing instanees:. In an historie building where through-roof venting would inter-fere with the eharaeter of the building.
In rehabilitation projeets where conventional venting is imprae-tical. In this ease, the vents should be at least L0 feethorizontally from the lot line and should be turned downward.They should be effeetively sereened with L/4 ineh mesh toavoid trapping and freezing of any eondensation. Through-the-wall vent openings should not be loeated direetly belowany door, window, or other building opening, nor should anysueh vent terminal be within ten feet horizontally of sueh anopening unless it is 2 feet above the top of such opening.
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