We are doing some repairs at the Three Links apartments in Northfield. The structural floor base in the hallways had some deficiencies in it. We removed the existing carpeting in the halls and discovered that the underlayment had not been attached properly to the structure. This allowed the underlayment to pull up from the substrate, creating ‘waves’ that were difficult for people to navigate. Our solution has been to screw the substrate directly to the structural members of the floor system. This greatly stiffens the floor and eliminates waves and gaps. We are then installing new carpeting over the flooring. There are quite a few hallways in this large building, but it seems to be working well to take sections at a time and complete the work.