Engineering Guide
How to Snow-Load a Tent
A standard clearspan structure is built to handle wind and its own weight, not sustained snow accumulation. Turning a tent into a snow-loaded structure means engineering it, from the frame up, to a specific set of site requirements.
The Short Version
- Your building code inspector sets the snow, wind and exposure numbers. The tent is engineered to meet them.
- Width drives strength. Length just repeats the same frame.
- Liri keeps pre-stamped snow-load designs, including 6 m (20 ft) and 20 m (66 ft) widths, to shorten the timeline.
- Steel purlins and inflatable roof covers add margin when you need it.
Rental tents are traditionally built for shorter-term installations and mobility, so a longer-term installation that may need heavier snow-load capability has to be addressed in the initial project scope of work. Here is what actually goes into that process, and what to expect when you bring a snow-load project to Liri Tent.
STEP 01
It starts with your building code inspector, not the tent company
Every snow-load project begins with a conversation between the client and their city or county building code inspector. The inspector determines the actual numbers a structure has to meet, because those numbers are set by location, not by the tent.
Ask your inspector to confirm:
- Duration of the install
- Governing code: which IBC (International Building Code) provisions apply in your area, plus any local amendments
- Exposure category for the site. Liri's base engineering covers urban and suburban conditions; more exposed sites need a specific review.
- Required snow load: commonly 20, 25 or 30 lb per square foot (0.96, 1.20 or 1.44 kPa), though it can run higher
- Required wind load
- How snow and wind combine: codes often check them together, not just separately. In some cases, a snow removal plan can avoid heavier snow-load requirements.
Example: a stamped, ready-to-deploy combination
A 6 m (20 ft) wide tent on Liri's BT frame, engineered and stamped for:
- Main beam
- 204 mm(8 in) profile
- Wind speed
- 98 mph(158 km/h)
- Exposure
- Copen terrain
- Snow load
- 25 psf(1.20 kPa)
STEP 02
Width, not length, determines strength
A clearspan tent's strength comes from its frame span: the width. Length just repeats the same structural bay down the row, adding more identical frames rather than changing how hard any single frame has to work.
Length: more of the same
Each bay adds an identical frame. Load per frame stays the same.
bay + bay + bay + ...
Width: harder-working frames
A wider span needs a heavier beam profile, cabling and anchoring.
That means two tents of the same width but different lengths carry the same load per frame. The beam profile, cabling and anchoring required for a 20 m (66 ft) wide tent are noticeably heavier-duty than what a 6 m (20 ft) wide tent needs, regardless of how long either structure is.
STEP 03
What Liri already has stamped, and what still needs sign-off
Having a stamped design on hand speeds up the timeline, but it is not a substitute for the local check. The right stamped design depends on your site's numbers matching it.
Liri provides
- Designs pre-engineered and stamped for snow load
- Ready widths including 6 m (20 ft) and 20 m (66 ft)
- Frame and beam profile matched to your numbers
Your inspector confirms
- Required IBC code
- Exposure category
- Snow load and wind load
STEP 04
Upgrades that improve snow performance
Steel purlins
Additional structural members that run across the rafters, shortening the span the roof carries on its own and adding load capacity.
Inflatable (air-supported) roof covers
Two-ply, pressurized covers are far less likely to indent or pocket under snow than a single-ply membrane, because air pressure keeps the roof taut.
STEP 05
Building for snow load, not just remediating it
Most winter-readiness guidance in the industry focuses on remediation: operational planning for a structure that is already standing. Useful, but it does not address the structure itself. Liri's approach starts earlier, at the design stage.
Remediation (typical)
- Monitoring forecasts
- Keeping access routes clear
- Inspecting after storms
Engineered (Liri)
- Bigger beam profiles for wider spans: the profile on a 20 m (66 ft) installation is substantially larger than a 6 m (20 ft) tent needs
- Additional cabling on wider spans, to control deflection and transfer load into the frame
STEP 06
What goes into developing a snow-load solution
- 1
Define the site and use case
Location, install duration, and how the space will be used.
- 2
Confirm code requirements
Your building inspector provides the governing code, exposure category, and required snow and wind values.
- 3
Match width to load
Liri identifies or engineers a frame width and beam profile rated for those numbers.
- 4
Layer in upgrades if needed
Purlins and/or an inflatable roof for extra margin, with a monitoring plan for anything power-dependent.
- 5
Get it stamped
A structural engineering seal specific to your site's requirements, before installation.
Frequently Asked Questions
Is every Liri tent snow-loaded by default?
Liri does not stock snow-loaded tents, but any tent in our inventory can be engineered for snow-load requirements.
How do I find out what snow load my project needs?
Start with your city or county building code inspector. They confirm the governing code, exposure category, and required snow and wind loads for your site.
Why does tent width matter more than length for snow load?
A clearspan tent's strength comes from its frame span (width), not how many bays are lined up end to end. Length repeats the same frame; width determines how hard each frame has to work.
Does Liri already have snow-loaded designs ready to go?
Yes. Liri keeps several widths, including 6 m (20 ft) and 20 m (66 ft), pre-stamped for snow load. The final design still has to be checked against your site's specific numbers.
What upgrades improve snow performance?
Steel purlins add structural support across the rafters, and two-ply inflatable roof covers resist indenting under snow better than single-ply fabric. Inflatable roofs need continuous power and active monitoring.
Do I still need to talk to a building inspector if Liri has a stamped design?
Yes. A stamped design confirms the tent can meet a given set of numbers; your inspector confirms which numbers apply to your project.
Talk to a Liri Tent specialist about your snow-load requirements
Bring your inspector's numbers. We'll match a stamped design or engineer one to fit.