regions of these uppermost column components extend upwardly through and beyond the building roof which is shown generally at 50 in fig2 a 2 b the upper end of column component 12 a as such is illustrated in these two figures roof 50 and the regions surrounding the upwardly projecting column components are fully weather sealed by the presence of an appropriately installed waterproof membrane 51 this membrane covers the upwardly facing surface area of the roof and u201c curls upwardly u201d and sealingly along the sides of projecting column components as is illustrated for the sides of column component 12 a in fig2 a 2 b the nominally open upwardly facing ends of the projecting column components are reversibly closed and weather sealed by appropriate removable caps such as cap 52 for column component 12 a these caps are configured as can be seen for cap 52 in fig2 b with downturned perimeter skirts such as skirt 52 a each of which skirts with the associated cap in place sealingly overlaps both the upper open end of a column component and the adjacent upwardly extending portion of membrane 51 one can thus see that after nominal completion of a building the utility access ports provided by the structure and practice of the invention are available at roof level such ports are thus available for use at different locations in a building frame essentially throughout the u201c life u201d of a building frame possessing them important aspects of the utility of the present invention will now be described beginning with fig1 and 3 shown generally at 54 56 58 in fig1 are.