Cantilever Rack with a Roof in Utah: Covered vs Open Outdoor Cantilever
When a roof over your cantilever rack is worth it, what snow does to the arms with or without one, which finish survives a Utah winter, and what the engineer and permit office will ask for.
21 psf
Lowest ground snow load on Utah’s map
July 1, 2026
Utah moved to IBC 2024 / ASCE 7-22
MH16.3-2025
Revised cantilever rack standard
Hot-dip galvanized
Finish for exposed steel
Shop Outdoor Cantilever Rack by Category
Covered or open, an outdoor run is built from uprights, arms and brace sets; galvanized sets are the usual choice where rack sees weather. Each card opens a shop category. Prices are current online prices; freight is quoted by destination and some common sizes in stock at select manufacturers, subject to confirmation. For a full layout, longer arms or freight-rated orders, request a free quote or plan it in the Cantilever Rack Configurator.
Open Yard or Roofed Cantilever: Start With What You Store
Most cantilever rack along the Wasatch Front lives outside. Lumber yards, pipe and steel distributors, fence suppliers and contractors put it in the yard because long material is awkward to bring indoors and the forklift or side loader needs room to swing a 20-ft bundle. The question we hear most once a yard rack is on the table is whether it should have a roof.
The answer depends first on the product. Galvanized pipe, steel bar and pressure-treated lumber can take the weather. Kiln-dried lumber, trim, finished millwork, insulation board, PVC that UV degrades and anything that has to ship clean and dry usually cannot. For local supply, delivery and installation, start with our cantilever rack page for Salt Lake City and Utah; for arm types, column heights and the full product range, see our cantilever rack systems overview.
Photo: Interlake Mecalux (authorized use)
| Option | Best for | Watch-outs |
|---|---|---|
| Open galvanized cantilever | Weather-tolerant stock: steel pipe, bar, tube, treated lumber, fence posts | Snow sits on the top loads; product sees sun and rain; aisles need clearing |
| Cantilever with a rack-supported roof (shed or canopy) | Dry lumber, trim, sheet goods, insulation, PVC, anything that must stay clean | The rack now carries roof snow and wind uplift; heavier design, more anchors, more involved permit |
| Cantilever under a separate building or pole barn | Large yards, long-term sites, mixed products | Highest cost; building clearances and fire protection enter the picture |
If most of what you keep outside is on pallets rather than long bundles, the pallet rack version of this decision is covered in our guide to outdoor pallet racking in Utah.
Snow on the Arms: The Load Open Cantilever Carries Too
Leaving the roof off does not take snow out of the design. On an open rack, snow lands on the loads on the top arm level and on the arms themselves. A bundle of lumber or square tube is a flat, wide surface, so it collects a layer that can weigh a lot more than people expect, and that weight goes straight into the arm and the column.
We saw this on an outdoor job we sent for engineering: a single-sided cantilever rack with three arm levels. When we told the rack engineer it would stand outside, the first response was that wind load and snow load had to be checked. The check came back with a warning that the top-level arm could become an issue if a worst-case cumulative snow load occurred. The lower arms were sheltered by the loads above them; the top arm was not.
Two recent changes make this more precise. RMI’s summary of the revised ANSI MH16.3-2025 cantilever standard says it updates how product, seismic and snow loads are combined, and it replaces the old rule (arms must not deflect below horizontal) with an explicit deflection limit. How much snow to design for depends on where the rack stands: Utah State University’s Utah ground snow load map shows 50-year ground snow loads by location and elevation, starting at a 21 psf floor and rising steeply into the mountains. A rack in a Park City or Heber yard sees very different numbers from one in West Valley City. Our guide to cantilever arm capacity by arm length explains how arm ratings work before snow is added.
What a Roof Changes in the Structure
A cantilever roof is usually carried by roof arms or rafters bolted to the tops of the columns, with purlins and metal sheeting on top. That makes the rack the building frame for the roof. RMI notes that the ANSI MH16.3 cantilever standard covers racks fitted with shed roofs and canopies, and that cantilever can be free-standing, top-tied, or built to support walls and a roof. Everything the roof collects comes down through the columns and bases into the anchors.
Roof snow
The full roof area’s snow load goes into the columns, in addition to the product on the arms.
Drifting and sliding
Snow drifts against high edges and slides off a sloped roof onto whatever is below.
Wind uplift
A roof is a wing. Wind under the eave tries to lift it, so anchors work in tension too.
Drip line
Meltwater falls at the eave and refreezes in the loading aisle unless it is managed.
| Roof design question | Why it matters |
|---|---|
| How far past the arm tips does the roof extend? | The roof has to overhang the loaded arms or blowing snow and rain still reach the stock |
| Where does the roof drain? | Toward the back or into a gutter, not onto the forklift aisle |
| Clear height under the roof arms | Room to lift the top-level bundle over the arm and back out |
| Side or back sheeting? | Walls keep weather out but add wind area and push the permit toward a building |
| Future expansion | Adding bays later means extending the roof, so plan the end details now |
Because the roof becomes part of the rack design, it is ordered and engineered with the rack, not added later. A roof bolted onto an existing open rack that was never designed for it is the combination we would not sign off on.
Single-Sided Lean-To or Double-Sided Canopy
A single-sided cantilever rack with a roof works like a lean-to. The roof slopes toward the back, away from the loading face, so water and sliding snow land behind the rack. It suits a run along a fence line or property edge. Because all the arms and the roof sit on one side of the column, the base and anchors see a larger overturning force, which is why single-sided roofed rows often come out with longer bases or heavier columns.
A double-sided rack with a canopy is balanced: arms and roof on both sides of the column, usually with a ridge or a single slope across the top. It suits the middle of an open yard where you load from both aisles. Unbalanced snow still matters, since one side can drift deeper than the other.
Illustration: Interlake Mecalux (authorized use)
| Single-sided with roof | Double-sided with canopy | |
|---|---|---|
| Typical location | Along a fence, wall or yard edge | Center of the yard, aisles on both sides |
| Roof drains toward | The back, away from the loading aisle | One or both aisles unless guttered |
| Overturning | Higher; longer bases or heavier columns | Balanced when both sides are loaded |
| Loading | One face | Both faces |
| Expansion | Add bays along the run | Add bays; can also add length to the canopy |
One detail from the engineering thread above: the customer wanted bases on the back side of a single-sided outdoor rack even though no arms would go there. The engineer treated the extended base as a help to stability. It is a reasonable request on an exposed site, and the kind of thing to decide before the order, not after.
Wind: Open Yards, Canyon Gusts and Roof Uplift
RMI’s guidance on using storage rack outside is direct: outdoor rack is subject to site-specific wind forces and snow loads on top of the product load and seismic forces, and all of them have to be designed for. A rack in an open yard with no building or fence line to break the wind is more exposed than one tucked beside a warehouse, and some Wasatch Front sites near canyon mouths see strong downslope winds.
Galvanized or Painted: Choosing a Finish for a Utah Yard
Standard cantilever rack is painted or powder coated. Indoors that finish lasts, but outside it is only as good as its worst chip, and forks, bundles and snow shovels make chips. Once bare steel sees freeze-thaw cycles and road salt carried in on truck tires, rust starts at the damage.
RMI recommends a finish formulated for outdoor use and suggests specifying galvanized when the manufacturer’s paint is not engineered for the weather. Hot-dip galvanizing bonds zinc to the steel inside and out, and the zinc keeps protecting the steel around scratches. The American Galvanizers Association’s time-to-first-maintenance chart projects about 72 years in an industrial atmosphere before first maintenance for 1/4-in steel with the 3.9-mil minimum coating required by ASTM A123.
| Finish | Outside | Notes |
|---|---|---|
| Hot-dip galvanized | Best long-term choice for exposed rows | Higher upfront cost and often longer lead time |
| Outdoor-rated paint or powder coat | Workable if the manufacturer confirms exterior use | Touch up chips before rust starts |
| Standard indoor paint | Only under a roof, above splash and standing water | Bases and column feet corrode first |
A roof lets some yards use a standard finish on the rack underneath, but the bases still sit in blowing snow and meltwater at the drip line. Many buyers specify galvanized for exposed rows and consider paint only for rack fully under cover. Galvanized cantilever in light and medium duty is available from stock at select manufacturers, subject to confirmation; heavier structural galvanized rack is often built to order, so allow for lead time.
The Ground Under an Outdoor Rack
Cantilever is designed on the assumption that every base is anchored into concrete with a known capacity. RMI’s outdoor guidance says installing rack on asphalt, gravel or other surfaces is generally not recommended unless special accommodations are made, and it asks designers to confirm that water will not pool anywhere in the structure. A roof raises the stakes because the anchors now resist uplift as well as overturning.
For a real yard where the customer poured footings sized to the base length and column spacing, see our outdoor yard cantilever rack project in Ogden. For anchoring and assembly order, see the cantilever rack installation guide for Utah.
Permits and Engineering for Roofed Cantilever in Utah
Utah changed codes this year. The Utah State University snow load site notes that as of July 1, 2026, Utah adopted the IBC 2024 and ASCE 7-22 for commercial construction, with different load factors than the 2021 codes its map was built for. Salt Lake City’s racking permit guidance asks for structural plans and calculations stamped by a Utah-licensed structural engineer, seismic design to ASCE 7-22, and a special inspection agreement listing storage racks (IBC 1705.13.7). Other cities along the Wasatch Front set their own submittal lists, so ask your building department early.
Describe the stock
Lengths, bundle weights, and what must stay dry.
Pick open or roofed
Plus single- or double-sided, and whether any walls are sheeted.
Engineer it for the site
Snow, wind and seismic for the actual address and elevation.
Submit and inspect
Stamped drawings, special inspection, final sign-off before loading.
A roofed rack is still a rack under MH16.3, but a covered structure in a yard can draw more questions from the plans examiner than an open one: roof loads, drainage, sometimes setbacks. If you are holding a design or quote engineered under the older codes, ask whether it needs a recheck before you submit.
Running Outdoor Cantilever Through a Utah Winter
- Brush heavy snow off top-level loads and roof edges after large storms, from the ground with a long-handled tool
- Mark column ends and base toes with high-visibility paint or flags so plows and forklifts can find them under snow
- Keep the drip line and loading aisle clear of ice; salt or sand where meltwater refreezes
- Inspect after storms and thaws: arm locks, anchors, base plates, bent arms, and any finish damage on galvanized steel
- Keep people away from outdoor rack in thunderstorms and extreme wind, as RMI advises
- Post arm and column capacities where operators load, and do not add product to make up for a ‘light’ top level
Whether you store lumber, pipe or steel outside, our application guides for lumber storage cantilever racking and pipe and tubing cantilever racking cover arm types and accessories for each. Roofing suppliers in particular should also see our cantilever rack for roofing supplies page.
What to Send Us for a Roofed or Outdoor Cantilever Quote
A good first quote on outdoor or covered cantilever needs a few facts beyond the usual column height and arm length. With these, we can size the rack, tell you whether a roof makes sense, and get the engineering started.
| Send us | Why |
|---|---|
| Site address | Sets snow, wind and seismic values and which building department reviews it |
| Longest, heaviest and most common bundles | Arm length, arm capacity and column spacing |
| What must stay dry | Decides open vs roofed, and whether any walls are needed |
| Single- or double-sided, and where it goes | Roof slope, drainage and overturning |
| Ground surface today | Concrete, asphalt or gravel changes the foundation plan |
| How you load | Forklift, side loader or crane sets clear height and aisle width |
| Finish preference | Galvanized, outdoor paint, or standard finish under cover |
We supply and install cantilever rack across Utah and the Mountain West, and our rack design services team can start from your material list. For palletized storage in the same yard, see our pallet rack systems.
Cantilever Rack in Salt Lake CitySupply, delivery and installation along the Wasatch Front.
Cantilever Rack Installation in UtahPermits, anchoring, assembly order and inspection.
Pallet Rack SystemsSelective pallet rack, beams and wire decking for palletized loads.Roofed and Outdoor Cantilever Rack FAQs
Can you put a roof on cantilever rack?
Does a roof on cantilever rack need a permit in Utah?
How much snow load does outdoor cantilever rack need to carry?
Is galvanized cantilever rack worth it outdoors?
Single-sided or double-sided for a covered cantilever rack?
Can cantilever rack go on asphalt?
Does Material Handling USA supply roofed cantilever rack in Salt Lake City?
Planning Cantilever Rack for Your Yard?
Tell us what you store, whether it must stay dry, and where the rack will stand. We will size the rack, advise on a roof and finish, and coordinate the engineering. Call 801-328-8788.