A Calculateur de semelle de terrasse helps builders, contractors, and homeowners determine the number of footings required to support a deck safely and efficiently. Deck footings are essential de construction components that distribute the weight of the deck, furniture, and occupants evenly to prevent sinking or instability.
By using this calculator, users can estimate the number of footings needed, calculate the load per footing, and ensure that the deck meets building code requirements for structural integrity and safety. Proper footing placement prevents deck sagging, uneven weight distribution, and potential failures over fois.
Formula for Deck Footing Calculation
Pour déterminer le number of footings required, utilisez la formule suivante :
Number of Footings
Number of Footings = (Deck Length / Spacing) + 1
Où :
Longueur du deck = Total length of the deck (feet)
espacement = Distance between footings (feet)
+1 ensures footings are placed at both ends
Load Per Footing
Pour calculer le load each footing must support, utilisez cette formule :
Load per Footing = (Total Deck Load) / (Number of Footings)
Où :
Total Deck Load = (Deck Area × Load per Square Foot)
Common residential deck load: 50 lbs per square foot (psf)
Cela garantit que each footing is capable of handling the appropriate weight, preventing structural issues such as shifting, cracking, or sinking over time.
Deck Footing Reference Table
Le tableau suivant fournit estimated footing requirements pour commun deck sizes and spacing intervals to help users quickly determine their deck’s support needs.
| Deck Size (ft) | Footing Spacing (ft) | Number of Footings | Load per Footing (lbs) |
|---|---|---|---|
| 10 × 10 | 4 | 4 | 1250 |
| 12 × 12 | 6 | 3 | 2400 |
| 16 × 16 | 6 | 4 | 3200 |
| 20 × 12 | 5 | 5 | 2400 |
| 24 × 20 | 8 | 4 | 6000 |
Ce tableau fournit une quick reference for deck builders, helping them determine the optimal footing placement for strength and safety.
Example of Deck Footing Calculator
A homeowner is building a 12 ft × 16 ft deck with footings spaced 6 pieds de distance.
Step 1: Calculate the Number of Footings
Number of Footings = (Deck Length / Spacing) + 1
= (16 / 6) + 1
≈ 4 footings
Step 2: Calculate the Total Deck Load
Total Deck Load = (Deck Area × Load per Square Foot)
= (12 × 16) × 50
= 9,600 livres
Step 3: Calculate the Load Per Footing
Load per Footing = (Total Deck Load) / (Number of Footings)
= 9,600 / 4
= 2,400 lbs per footing
Cela signifie que chaque footing must be capable of supporting 2,400 lbs pour assurer la deck remains stable and structurally sound.
FAQ les plus courantes
Proper footing spacing evenly distributes the deck’s weight, empêchant sagging, tilting, or structural failure. Incorrect spacing can lead to excessive stress on certain areas, augmentant le risque de dommages.
Footings should extend sous la ligne de gel pour prévenir heaving and shifting in colder climates. Check codes du bâtiment locaux for recommended footing depth in your area.
Oui, larger footings with a greater load-bearing capacity peut réduire le total number needed, but they must still meet weight distribution and de stabilité exigences. Consultez toujours un structural engineer or local building authority.