Stair system

Abstract

A stair system including an upper tread having a substantially planar body portion, a stair nose portion located at one side of the planar body portion, and a dado located behind the stair nose portion, at least one lower tread, the lower tread having a substantially planar body portion, a stair nose portion located at one side of the planar body portion, a dado located behind the stair nose portion, and a groove located at a side opposite the stair nose portion, and at least two risers, each riser having a substantially planar body portion. In the stair system, one of the at least two risers is receivable between the dado of the upper tread and the groove of the lower tread and the other of the at least two risers is receivable in the dado of the lower tread. Methods for assembling a stair system are also provided.

1 . A stair system comprising:
 an upper tread having a substantially planar body portion, a stair nose portion located at one side of the planar body portion, and a dado located behind the stair nose portion;   at least one lower tread, the lower tread having a substantially planar body portion, a stair nose portion located at one side of the planar body portion, a dado located behind the stair nose portion, and a groove located at a side opposite the stair nose portion; and   at least two risers, each riser having a substantially planar body portion,   one of the at least two risers being receivable between the dado of the upper tread and the groove of the lower tread,   the other of the at least two risers being receivable in the dado of the lower tread.   
   
   
       2 . The stair system according to  claim 1 , wherein the groove of the at least one lower tread is formed in an upper surface of the planar body portion. 
   
   
       3 . The stair system according to  claim 2 , wherein the groove of the at least one lower tread is a rabbet. 
   
   
       4 . The stair system according to  claim 2 , wherein the groove of the at least one lower tread is a dado. 
   
   
       5 . The stair system according to  claim 1 , wherein the at least one lower tread includes a plurality of lower treads, each of the lower tread having a substantially planar body portion, a stair nose portion located at one side of the planar body portion, a dado located behind the stair nose portion, and a groove located at a side opposite the stair nose portion; and
 wherein the at least two risers includes a plurality of risers such that the number of risers corresponds to the number of lower treads plus the upper riser.   
   
   
       6 . The stair system according to  claim 1 , wherein the stair nose portions of the upper tread has a thickness substantially equal to the thickness of the planar body portion of the upper tread and the stair nose portion of the at least one lower tread has a thickness substantially equal to the thickness of the planar body portion of the at least one lower tread. 
   
   
       7 . The stair system according to  claim 1 , wherein the stair nose portions of the upper tread has a thickness greater tan the thickness of the planar body portion of the upper tread and the stair nose portion of the at least one lower tread has a thickness greater than the thickness of the planar body portion of the at least one lower tread. 
   
   
       8 . The stair system according to  claim 1 , further comprising:
 at least two stringers, each stringer having a plurality of tread sides and a plurality of riser sides;   a plurality of tread sub-floorings corresponding to the plurality of tread sides, each of the plurality of tread sub-floorings spanning between the at least two stringers and affixed to corresponding tread sides;   a plurality of riser sub-floorings corresponding to the plurality of riser sides, each of the plurality of riser sub-floorings spanning between the at least two stringers and affixed to corresponding riser sides.   
   
   
       9 . The stair system according to  claim 8 , wherein the upper tread is affixed to one of the plurality of tread sub-floorings, the at least one lower tread is affixed to another of the plurality of tread sub-floorings, and each of the at least two risers are affixed to different riser sub-floorings. 
   
   
       10 . The stair system according to  claim 8 , wherein an end of each of the tread sub-flooring extends beyond the lower adjacent riser sub-flooring such that the riser sub-flooring is recessed behind the end of the tread sub-flooring. 
   
   
       11 . The stair system according to  claim 10 , wherein the upper tread is affixed to one of the plurality of tread sub-floorings and the at least one lower tread is affixed to another of the plurality of tread sub-floorings. 
   
   
       12 . The stair system according to  claim 11 , wherein each of the plurality of risers are affixed to the corresponding dado. 
   
   
       13 . The stair system according to  claim 12 , wherein each of the plurality of risers are affixed to the end of the upper adjacent tread sub-flooring. 
   
   
       14 . A method for assembling a stair system, the stair system having at least two stringers, each stringer having a plurality of tread sides and a plurality of riser sides, a plurality of tread sub-floorings corresponding to the plurality of tread sides, each of the plurality of tread sub-floorings spanning between the at least two stringers and affixed to corresponding tread sides, and a plurality of riser sub-floorings corresponding to the plurality of riser sides, each of the plurality of riser sub-floorings spanning between the at least two stringers and affixed to corresponding riser sides, the method comprising:
 affixing a first riser to the lowermost riser sub-flooring of the plurality of riser sub-floorings;   affixing a lower tread to one of the plurality of tread sub-floorings adjacent the lowermost riser sub-flooring, the lower tread having a substantially planar body portion, a stair nose portion located at one side of the planar body portion, a dado located behind the stair nose portion, and a groove located at a side opposite the stair nose portion, the first riser being received in the dado of the lower tread;   affixing a second riser to the uppermost riser sub-flooring of the plurality of riser sub-floorings, the second riser being received in the groove of the lower tread; and   affixing an upper tread to one of the plurality of tread sub-floorings adjacent the uppermost riser sub-flooring, the upper tread having a substantially planar body portion, a stair nose portion located at one side of the planar body portion, and a dado located behind the stair nose portion, the second riser being received between the groove of the lower tread and the dado of the upper tread.   
   
   
       15 . The method according to  claim 14 , further comprising:
 affixing an intermediate riser to one of the riser sub-floorings located between the lowermost riser sub-flooring and the uppermost riser sub-flooring; and   affixing an intermediate tread to one of the tread sub-floorings located between the lowermost tread sub-flooring and the uppermost tread sub-flooring, the intermediate tread having a substantially planar body portion, a stair nose portion located at one side of the planar body portion, a dado located behind the stair nose portion, and a groove located at a side opposite the stair nose portion.   
   
   
       16 . The method according to  claim 15 , wherein there is only three risers, the intermediate riser is received in the groove of the lower tread and the dado of the intermediate tread and the second riser is received in the groove of the intermediate tread and the dado of the upper tread. 
   
   
       17 . A method for assembling a stair system, the stair system having at least two stringers, each stringer having a plurality of tread sides and a plurality of riser sides, a plurality of tread sub-floorings corresponding to the plurality of tread sides, an end of each of the tread sub-flooring extends beyond the lower adjacent riser sub-flooring such that the riser sub-flooring is recessed behind the end of the tread sub-flooring, each of the plurality of tread sub-floorings spanning between the at least two stringers and affixed to corresponding tread sides, and a plurality of riser sub-floorings corresponding to the plurality of riser sides, each of the plurality of riser sub-floorings spanning between the at least two stringers and affixed to corresponding riser sides, the method comprising:
 affixing a first riser to the lowermost tread sub-flooring of the plurality of tread sub-floorings;   affixing a lower tread to the lowermost tread sub-flooring of the plurality of tread sub-floorings adjacent the lowermost riser sub-flooring, the lower tread having a substantially planar body portion, a stair nose portion located at one side of the planar body portion, a dado located behind the stair nose portion, and a groove located at a side opposite the stair nose portion, the first riser being received in the dado of the lower tread;   affixing a second riser to the uppermost tread sub-flooring of the plurality of tread sub-floorings; and   affixing an upper tread to the uppermost tread sub-flooring of the plurality of tread sub-floorings adjacent the uppermost riser sub-flooring, the upper tread having a substantially planar body portion, a stair nose portion located at one side of the planar body portion, and a dado located behind the stair nose portion, the second riser being received in the dado of the upper tread.   
   
   
       18 . The method according to  claim 17 , further comprising:
 affixing an intermediate riser to one of the tread sub-floorings located between the lowermost tread sub-flooring and the uppermost riser sub-flooring; and   affixing an intermediate tread to one of the tread sub-floorings located between the lowermost tread sub-flooring and the uppermost tread sub-flooring, the intermediate tread having a substantially planar body portion, a stair nose portion located at one side of the planar body portion, a dado located behind the stair nose portion, and a groove located at a side opposite the stair nose portion.   
   
   
       19 . The method according to  claim 18 , wherein there is only three risers, the intermediate riser is received in the groove of the lower tread and the dado of the intermediate tread and the second riser is received in the groove of the intermediate tread and the dado of the upper tread.