We are building a new 2 story home. We discovered rather large holes punched through the sheathing that is applied to the trusses for the second floor. These holes are larger than your fist and are all along the top of the sheathing attached to the trusses. We asked the builder why these holes are there and he said they punched the holes through with a hammer so they could put ropes through the holes to hoist the trusses to the second floor. We were told this is common practice but we are concerned. Has anyone seen this done?