Ensuring that your plumbing can make the minimum falls required within confined spaces, such as floor to ceiling cavities, can be awkward. If you do not have ArchiCAD’s MEP modelling software, then you might like to try this trick. To create your drains, simply use a CHS Hot-Finished Beam 21 from the built-in library. Set the Rotation Axis to Along cross-section, and put in the required fall in terms of an angle.
Those who are NZ select customers you have access to the New drainage objects from the Essential Library which you can download from mycadimage.com