Common Plumbing Design Mistakes 31-40
Click on an item below to view additional information and suggestions on how to avoid the mistake .

 31.  Inadequate details and/or specifications for roof supports.
            a) Verify roof construction proposed and obtain section detail from architect.
            b) Select roof piping supports that prevent roof damage.
            c) Select roof piping supports that compensate for roof slope.
            d) Use 4"x4" treated wood only for small diameter piping and non-sloping roofs.
            e) Select roof piping supports that allow pipe movement when required.
            f) Review related pipe support information at...RepWars-Intelligence Reports.
 32.  Inadequate details and/or specifications for roof penetrations.
            a) Verify roof construction proposed and obtain section detail from architect.
            b) Provide details on drawings for the various plumbing roof penetrations within project.
 33.  Inadequate details and/or specifications for wall floor penetrations.
            a) Verify fire ratings of walls and floors within project.
            b) Provide details on drawings for all various penetrations required.
            c) Insure that rated assemblies meet U.L. listings.
 34.  No provisions for pipe identification labeling.
            a) Specify type and nomenclature of labeling for the various piping system proposed.
            b) Verify pipe identification requirements within NFPA and other applicable code agencies.
 35.  Failure to provide electric heat tracing for piping freeze protection.
            a) Specify thermostaically controlled heat tracing for all piping susceptable to freezing.
            b) Coordinate with electrical engineer to provide proper power supply.
            c) Insure that pipe insulation specification accomodates installation of tracing wire.
 36.  Omission of air gap fitting for dishwasher waste discharge.
            a) Provide approved air gap protection at dishwasher discharge into sanitary system.
 37.  Specifying incompatible medical gas outlets.
            a) Verify owner required outlet types and specify compatible outlets.
 38.  Failure to provide capped valves for future connections.
            a) Strategically locate capped valves on drawings within the various systems to prevent service
                 interruptions during future extensions.
 39.  Non-ADA-Compliant Flush valve handles.
            a) Specify flush valve handles that actuate with five foot-pounds or less force.
            b) Provide note on drawings requiring water closet handles to be located on wide side of stalls.
 40.  Interference between grab bars and lavatory backsplash.
            a) Verify locations and dimensions of grab bars within toilet rooms.
            b) Specify lavatories that do not have backsplash where interferences occur.