.::. Some Random Terms .::. • Sistering Attaching a new se3ction to the original material, typically structural lumber, to reinforce it along its length. Also called scabbing. .... • Sash stop A piece of vinyl used to stop the travel of the sash at the top and bottom of the window. .... • Cement Usually refers to portland cement which is mixed with sand, gravel and water to form concrete. ....