Flooring clampA flooring clamp is a clamp for holding tongue and groove flooring in place while laying.ApplicationA flooring clamp is utilized to secure tongue-and-groove flooring during the face-nailing of individual boards. Typically, between eight and ten boards can be clamped simultaneously. While a minimum of two clamps is required, it is common to use additional clamps. They should be spaced approximately every 4th or 5th joist.PlacementThe clamp is placed over a joist, then its ratchet action handle is used to apply horizontal pressure on a sacrificial bearing board to hold the flooring boards true and in place for fastening.