Final answer:
The statement is true; the most common causes of deck collapse include ledgers that pull away from the band joists due to improper fastening or wood decay.
Step-by-step explanation:
The statement that ledgers pulling away from the band joists is a common cause of deck collapse is true. This type of failure is often due to improper fastening of the ledger board to the primary structure of the home or building.
The ledger board is critical in deck construction as it is typically the point at which the deck is attached to the main structure.
It is important for the ledger to be securely attached using proper fasteners and following building codes. Collapses can occur when the ledger board is not properly secured, when inadequate fasteners are used, when there is wood rot or decay, or when the load on the deck exceeds the designed capacity.
In addition to ledgers, other potential causes of deck collapse include corrosion of fasteners, overloading, poor maintenance, and structural deficiencies in the deck design or construction. Regular inspection and maintenance of a deck, particularly looking at the condition of the ledger connection, can help prevent collapses.