Chapter 4 - STAIR BODY - WM Coffman

BULLNOSE STARTINGEND CAPSCoffman’s bullnose startingend caps are manufacturedin both a left and righthanded C-8011 as well as ina reversible C-8911. TheC-8011 LH or RH startingend caps have a 1" thicktread with a 1/2" slot routedinto the bottom of the capto fit around theriser/skirtboard corner.PHOTO 4-63. Thisconfiguration allows thestep to be used directly fromthe carton with the standardtread caps that are 1/2" thick.1/2" ROUTED SLOT4-631/2" SHIM4-64The 1" thickness of the reversible C-8911 tread, however, must be accounted for in bothrough carriage layout and installation. Either notch the tread with a router to accept thesubtread (See Photo 4-63) or cut a 1/2" shim to fit on top of the first subtread. This shim shouldbe trimmed to fit the subtread from the edge of the starting end cap to the wall. PHOTO 4-64.NOTE: If the closed side tread cap is shimmed up 1/2" to tie into the 1" thickness of theC-8911, the first rise of the rough carriage must be lowered 1/2" to keep each rise on thestair equal. Refer to Chapter 3, Page 7, Dropping of Carriage, for more information on tyingfinished tread thickness into the design of the stair.20 CHAPTER 4 - TREADS AND RISERSC O F F M A N S T A I R P A R T S • S I N C E 1 8 7 4