By Patriot Home Service. Published: . Updated: . Published by Patriot Home Service.
Follow a deck's load path and understand why its connections and foundation matter as much as its surface boards.
Follow a deck's load path and understand why its connections and foundation matter as much as its surface boards.
Deck boards transfer loads to joists, which transfer them to beams or other supports, then to posts and footings. Each link must work with the others. A strong board cannot compensate for an inadequate connection below it. People, furniture and special features create different loads; a hot tub or heavy planter is not an ordinary accessory that can be added without design review.
An attached deck may transfer load through a ledger connection to the house. That connection needs an appropriate structural substrate and water-management detail. Cladding is not automatically a suitable structural attachment. A freestanding deck has its own supports and stability requirements. Site slope, soil, utilities and access can change how either design is supported and constructed.
Footing dimensions, spans, fastener types and guard details depend on the adopted code, material properties, manufacturer's instructions and sometimes engineering. A generic diagram is useful for vocabulary, not a substitute for an approved design. Before work begins, identify permit requirements and any inspections needed before concealed work is covered.
Do not use this overview to size structural members or connections. Structural design and soil conditions require qualified project-specific evaluation. Utility marking is needed before excavation.
These references provide supporting guidance and further reading. Follow current local requirements and the instructions for your exact products; some publications address particular materials, products or code editions.