Durawood Products Pre-Assembled Rail - Stairs - Treads & Risers - Stair Parts STAIR TYPES MEASURING STRINGER CUTS CEILING CUTS TRIM OPTIONS SHIPPING OPTIONS SPECIFICATIONS   STAIR COMPONENT SPECIFICATIONS BOX STRINGERS OPEN STRINGERS EXPOSED STRINGER TREADS RISERS STAIR CONSTRUCTIONS SPECIFICATIONS STAIR TOLERANCES BOX STRINGERS Top edge and exposed area on inside of stringer follows grading of specified species. Outside and backside of stringer follows # grading specifications unless exposed stringers" is specified. [BACK TO TOP] OPEN STRINGERS Bottom edge of outside of stringers follows grading specifications of specified species. Backside of stringer follows #2 grading specifications [BACK TO TOP] EXPOSED STRINGER Refers to outside of box stringer Material follows grading specifications of specified species. Exposed stringers are sanded and may have pin holes if packaging is required [BACK TO TOP] TREADS Face and bullnose of treads follows grading specifications of specified species. Backside of treads follows #2 grading specifications. [BACK TO TOP] RISERS Face of risers follows grading specifications of specified species Backside of risers follows #2 grading specifications. [BACK TO TOP] STAIR CONSTRUCTIONS SPECIFICATIONS Box stringers will be routed ½" deep to accept the tread and risers. Glue wedges will be installed form the backside to assure a tight stringer/tread/risers joint on the face side of the stair. Wedges will not protrude lower than the bottom edge of the stringer. One 2" staple will be installed through the outside of each stringer into landing tread. Two 2" staples will be installed through the outside of each stringer into each tread. Two 2" staples will be installed through the outside of each stringer into each riser. Six 2" staples will be installed through the back of each riser into the back edge of each tread. Open stringers will be attached to the risers and treads with pin nail, glue and glue block. A ¼" x 13/16" dado will be cut into the bottom of each tread to accept the riser. Joints will be secured with flue and glue blocks. One 14" glue block per tread will be installed on stairs up to 37" wide Fore each additional 6" of width one additional glue block will be installed Glue blocks will be attached with flue and six 1" staples All staples will be flush or counter sunk A #2 yellow pine landing tread will have one 2" staple through it's face into the top riser. Flush or counters sunk not puttied and sanded. A "D" yellow pine or oak landing tread will have one 2" staple through it's face into the top riser counter sunk, puttied and sanded. [BACK TO TOP] STAIR TOLERANCES Stringers 1/16" on specified thickness: ¼" on width Treads 1/16" on specified thickness: 1/16" on width (depth) Risers 1/16" on specified thickness: 1/16" on height Stair Width 1/8" on specified on width [BACK TO TOP]