# US 2014/0190118 A1 · Staircase and method for construction > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0190118 A1 - Document ID: US20140190118A1 - Status: Published application - Kind: A1 - Application number: 14/197,355 - Filed: 2014-03-05 - Published: 2014-07-10 - Earliest claimed: 2012-04-03 - Assignees: Signature Companies - Applicants: Signature Companies - Inventors: Philip R. KELLER; Jeffrey A. KAMINSKI; Shoukat A. TURABI - Web page: https://patentgrep.com/patent/US20140190118A1 ## CPC - E04F 11/025: Stairways having stringers {(E04F11/035 takes precedence)} - E04F 11/02: Stairways; Layouts thereof - E04F 11/035: Stairways consisting of a plurality of assembled modular parts without further support {(E04F11/032 takes precedence)} - E04F 11/108: of wood {or with an upper layer of wood} - E04F: FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS (windows, doors E06B) ## Abstract A staircase and method for producing the same. The staircase is produced by double routing channels for sub-treads and sub-risers and capping risers and capping treads. These sub-treads and sub-risers are assembled into staircase stringers that have pre-routed channels that are sufficient to install sub-treads and sub-risers having a particular thickness and having room for subsequent placement or installation of capping treads and risers by sliding them laterally into the channels created by the double routing of the stringers. This creates a more finished look to be (the) staircase while avoiding damages to the capping treads and risers that might occur during building construction. ## Claims ### Claim 1 A method for constructing a staircase comprising: routing a plurality of riser channels in a first staircase stringer, the plurality of riser channels comprising a channel width sufficient to encompass the thickness of a sub-riser and a capping riser in each of the plurality of riser channels; routing a plurality of tread channels in the first staircase stringer, the plurality of tread channels comprising a channel width sufficient to encompass the thickness of a sub-tread and a capping tread in each of the plurality of tread channels; routing a plurality of riser channels in a second staircase stringer, the plurality of riser channels comprising a channel width sufficient to encompass the thickness of the sub-riser and the capping riser in each of the plurality of riser channels; routing a plurality of tread channels in the second staircase stringer, the plurality of tread channels comprising a channel width sufficient to encompass the thickness of the sub-riser and the sub-tread and each of the plurality of tread channels; assembling the first and second staircase stringers together with a plurality of sub-treads in the plurality of tread channels, and a plurality of sub-risers in the plurality of riser channels; and installing capping risers and capping treads to each of the plurality of sub-risers and sub-treads. ### Claim 2 (depends on 1) The method for constructing a staircase of claim 1 wherein each capping riser and capping tread is of a length shorter than the length of the corresponding sub-riser and sub-tread, but equal to or greater than the dimension between the non routed portions of the assembled staircase. ### Claim 3 (depends on 2) The method for constructing a staircase of claim 2 wherein installing the capping risers and capping treads to each of the plurality of sub-risers and sub-treads comprises inserting each capping riser and capping tread into the corresponding riser channel and tread channel of the first staircase stringer and sliding each capping riser and capping tread laterally so that each capping riser and each capping tread is partially embedded into the corresponding riser and tread channels of the first and second stringers. ### Claim 4 (depends on 1) The method of constructing a staircase of claim 1 wherein: routing a plurality of riser channels in the first and second stringers comprises routing a portion of the riser channels to a first depth and a second portion of the riser channels to a second depth; and wherein routing a plurality of tread channels in the first and second stringers comprises routing a portion of the tread channels to a first depth and a second portion of the tread channels to a second depth. ### Claim 5 (depends on 1) The method of claim 1 further comprising routing a first sub-riser channel so that the height of the first sub-tread in this staircase is less than the finished stair height by an amount equal to the thickness of the capping tread to be applied to the first sub-tread of the staircase. ### Claim 6 (depends on 1) The method of claim 1 further comprising routing a first sub-riser channel so that the height of the first sub-tread in the staircase is less than the capping tread height by an amount equal to the thickness of the capping tread and wherein the second sub-riser height is taller than the first sub-riser by an amount equal to the thickness of a first staircase step capping tread minus the thickness of a second staircase step capping tread, and wherein subsequent sub-riser heights are equal to the staircase rise required for the staircase to meet applicable building standards. ### Claim 7 (depends on 1) The method of claim 1 where in the staircase comprises a box staircase. ### Claim 8 (depends on 1) The method of claim 1 wherein the staircase comprises a one-side-open stair tread. ### Claim 9 (depends on 1) The method of claim 1 wherein the staircase comprises a two-side-open stair tread. ### Claim 10 (depends on 1) The method of claim 1 wherein the staircase comprises a staircase from the group consisting of a curved box staircase, a curved 1-side-open staircase, and a curved 2-side-open staircase. ### Claim 11 (depends on 1) The method of claim 1 wherein the first step in the staircase is constructed from the group consisting of a one-side-open bullnose step, and a two-side-open bullnose step. ### Claim 12 (depends on 1) The method of claim 1 wherein the first staircase step comprises a double bullnose capping tread and the first step stringers are constructed as 2-side-open stringers allowing the double bullnose capping tread to be installed. ### Claim 13 (depends on 1) The method of claim 1 wherein the first staircase step comprises a single bullnose capping tread and the first step stringers are notched and one-side-open allowing the double bullnose capping tread to be installed. ### Claim 14 (depends on 1) The Method of claim 1 further comprising: notching the first staircase stringer when a staircase transitions from 1-side open or 2-side open to a box/closed stringer allowing for installation of the capping tread when transitioning from a boxed/closed first and second staircase stringers to a 1-side-open or 2-side open staircase. ### Claim 15 (depends on 1) The method of claim 1 wherein the capping tread comprises a capping bullnose tread.