1811.2.2 Cushion or cap block.
BC § 1811.2.2
The cushion or cap block shall be a solid block of hardwood with its grains parallel to the axis of the deep foundation and enclosed in a tight-fitting steel housing, or other accepted equivalent assembly. If laminated materials are used, their type and construction shall be such that their strength is equal to or greater than hardwood. Wood chips, pieces of rope, hose, shavings, automobile tires or similar materials shall not be used. Cap block cushions shall be replaced if burned, crushed, or otherwise damaged. Other cushion materials may be used subject to the approval of the engineer. The introduction of fresh hammer cushion or pile-driving cushion material just prior to final penetration is not permitted.
