Code-compliant analysis

Why deck load calculations are required

Structural calculations verify that every component of a deck can safely support anticipated loads without excessive deflection or structural failure.

Our licensed structural engineers provide complete deck structural calculations — including load calculations for residential, commercial, rooftop, balcony, terrace, patio, and elevated decks — prepared per the applicable building codes, engineering standards, and local jurisdiction requirements to ensure safety, durability, and permit approval.

Loads we evaluate

Every load, calculated.

Dead Load (DL)

Deck boards, joists & beams
Columns, ledgers & connections
Railings & stairs
Roofing & ceiling finishes
Typical residential: 10–20 psf

Live Load (LL)

Residential decks: 40 psf
Residential balconies: 60 psf
Commercial decks: 100 psf
Assembly areas: 100 psf+
Roof decks per code & occupancy

Snow Load

Ground & flat-roof snow load
Drift loads & sliding snow
Unbalanced accumulation
Ice accumulation
Region-specific analysis

Wind Load

Uplift & lateral forces
Overturning analysis
Connection & anchorage design
Guardrail resistance
Pergola uplift

Seismic Load

Earthquake force analysis
Lateral resistance
Diaphragm action
Connection detailing
Foundation anchorage

Concentrated Loads

Hot tubs, spas & outdoor kitchens
Fireplaces & pizza ovens
Heavy planters & water features
Mechanical equipment
Storage areas

Codes & standards

Designed to code.

Every calculation follows the latest applicable editions of recognized engineering standards.

Building Codes

International Building Code (IBC)
International Residential Code (IRC)
Local amendments & municipal requirements

Engineering Standards

ASCE 7 — Minimum Design Loads
AWC NDS for Wood Construction
AISI & AISC steel standards
ACI 318 (concrete)

Permit-Ready Package

Structural calculations & drawings
Framing plans & beam schedules
Joist layouts & foundation details
Connection details & construction notes

Frequently Asked Questions.

What loads are included in deck structural calculations?

Dead load, live load, snow load, wind load, seismic load, and concentrated loads (hot tubs, planters, mechanical equipment, fireplaces).

What live load value applies to a typical residential deck?

40 psf for standard residential decks, 60 psf for balconies, and 100 psf or more for commercial decks, per code and occupancy classification.

Why do wind and snow load matter for an uncovered deck?

Uplift on guardrails, lateral wind force, and region-specific snow drift/accumulation all apply even without a roof — skipping this analysis is a common cause of deck failure in high-wind or heavy-snow regions.

What codes govern these calculations?

IBC, IRC, ASCE 7 (Minimum Design Loads), AWC NDS for wood construction, and applicable local amendments.

Is a new load calculation needed for a simple board replacement?

Not usually, if the structural frame is unchanged and no new load is added. Adding a hot tub, pergola, or other fixture always warrants a fresh calculation.

Get your load calculations.

Send us your project details and receive complete, permit-ready structural load calculations from licensed engineers.

✓PE in all 50 states✓24–72 hr turnaround✓Permit-ready