Aluminum Ramp Buying Guide: Matching Length, Capacity, and Slope to the Job

Your father clears the front door in his wheelchair without any trouble. Then he reaches the three steps down to the sidewalk, and the trip ends right there. Nobody in the house can carry him and the chair at the same time, so the chair stays parked on the porch and he stays inside. An aluminum ramp fixes that, and it usually fixes it without a concrete pour, a contractor, or a permit argument. The trouble is sizing. Order one that’s too short and the slope scares everyone who looks at it. Order one that’s too long and it won’t fit between the porch post and the hedge.

The same problem shows up in a driveway. You’ve got a 14 inch (36 cm) drop from the truck bed to the ground, a 700 lb (318 kg) side-by-side on the bed, and a folding ramp that looked longer in the listing photo than it does in your hands. It buckles under the load, or the run comes out so steep the machine spins halfway up.

Both stories come down to two numbers. How high you have to climb, and how far you have room to climb it. Width, weight rating, surface, hinges, and finish are all decisions you make after those two numbers are written down. That’s the order this page follows. Rise first, then slope, then load, then shape.

Measure the rise before you look at a single product

Set a straight edge on the porch floor, hook a tape on it, and drop the blade to the ground below. That vertical distance is your rise, and it’s the number that decides everything else. A half inch (1.3 cm) lip at a patio door is a threshold problem you can solve for the price of a pair of shoes. Eight inches (20 cm) is a two-section ramp. Twenty nine inches (74 cm) is a serious build, and if the ramp serves a clinic, a church, or a storefront, it’s a construction project with a permit attached.

Now measure the run. Not the porch. The run you actually have.

That means the horizontal distance from the bottom step to the nearest thing that isn’t part of your plan: the sidewalk, the hedge, the parked car, the gas meter, the property line. Multiply the rise by twelve and you have the length an ADA-style slope asks for. A 20 inch (51 cm) rise wants 20 feet (6.1 m) of run. Most porches don’t have it, which is why switchbacks, platforms, and honest conversations with a builder exist.

If the run falls short, you have three options and only three. Add a landing and turn the ramp, lower the rise by building up the ground or the deck, or accept a steeper slope and take the tradeoffs in the next section. What you can’t do is buy a short ramp and hope the person using it has strong arms. If the ramp is for a wheelchair user, the wheelchair ramp section covers the platform and handrail side of the build in more depth.

Two measuring mistakes account for most of the returns. The first is measuring the rise with the bottom step included, which adds height that the ramp’s own lip already covers. The second is forgetting that the bottom step sticks out into the run, so the slope starts a foot closer to the sidewalk than you planned. Mark both ends with tape on the concrete, stand back, and look at what’s left.

The slope numbers that decide everything

The 2010 ADA Standards set the ramp maximum at 1:12, which works out to 8.33 percent. Each run of ramp tops out at a 30 inch (76 cm) rise before you need a landing, landings measure at least 60 by 60 inches (152 by 152 cm), cross slope stays under 1:48, and handrails sit 34 to 38 inches (86 to 97 cm) above the surface on both sides in most cases. Those numbers come from the actual federal accessibility standard, and they apply to public accommodations, not to your private front porch.

Private or not, 1:12 is the slope worth copying. The math doesn’t change for a portable aluminum ramp on a wooden porch, and the slope a therapist measures with a level is the same slope an inspector recognizes, it’s the number a home insurance inspector recognizes, and it’s the slope a manual wheelchair user can self-propel on a good day. The Access Board publishes a plain-language guide to the ADA standards if you want the source without the legal formatting.

Here’s how the grades feel in practice. At 1:12 a caregiver can push an adult up a 20 foot run without stopping. At 1:10 it’s a shorter ramp doing the same job, and most people manage it. At 1:8 you’re at 12.5 percent, which is where power chairs still climb, assisted pushes get hard, and a manual chair user starts needing help. Past 1:6 the surface texture stops meaning much and the ramp becomes a slide with ambitions.

Steep ramps don’t get used. They get avoided.

One more thing that trips people up. Threshold ramps, the little wedges that sit over a door sill or a single step, aren’t treated as building ramps by the ADA, so the 1:12 rule doesn’t technically govern them. The usual working range in the industry is 1:8 to 1:12, and local codes vary. Check with your local building department before you buy a wedge for a step you consider small.

Four places these ramps actually earn their keep

Doorways and single steps are the most common job. A threshold ramp sits on the step and turns a 3 inch (7.6 cm) drop into a slope you can roll over. The details that matter are the top lip sitting flush with the sill instead of on it, the door still clearing the ramp when it swings, and the bottom edge not lifting off the ground when the chair’s front casters hit it. A wedge that rocks is worse than no wedge.

Trailers, vans, and truck beds are the second big one. This is where a loading ramp does its work, and where the spec sheet matters more than the pictures. You want a rated capacity above the machine plus rider plus any cargo, a width that fits the widest part of the machine rather than the tire, and an attachment method you trust at highway-adjacent speeds. Hooking over a tailgate lip and calling it secured is how ramps end up on the road behind you.

Sheds, docks, and outbuildings come third. A 12 inch (30 cm) step into a shed is nothing until you’re hauling a snowblower up it in November. Fourth is the ramp you buy for a rental, a parent’s house, or a seasonal place where drilling into anything isn’t an option. That last case is where a folding aluminum ramp earns its price, because it comes home with you when the lease ends.

Measure the van door with the vehicle on level ground. A sloped driveway quietly turns a level ramp into a tilted one, and the chair drifts sideways the whole way up.

There’s a fifth case that doesn’t get talked about enough: the ramp over a curb. Parking strips, garden borders, and dropped curbs all leave a lip that stops a chair dead, and a short aluminum plate with a folded edge solves it in seconds. It’s the cheapest accessibility fix on the list and the one people notice least.

Why aluminum, and where it stops being the right answer

Most of these ramps are built from 6061-T6 aluminum, which weighs roughly a third of what the same steel section would and doesn’t need paint to survive weather. The metal forms its own oxide skin, so rain, road salt, and coastal air do far less damage than they’d do to mild steel. The Aluminum Association keeps the public material data if you want to read beyond a spec sheet.

The grip comes from the surface, not the alloy. Punched holes, extruded ridges, or an applied abrasive strip give wet shoes and wet tires something to bite. Now the honest part. Those holes clog. Wet leaves, snow, mud, and beach sand pack into them, and a clogged ramp is a smooth ramp. On a slope past roughly 1:6, no surface texture saves you, which is why steep is a design failure rather than a grip problem.

Aluminum also flexes. A short span feels stiff and reassuring. A long unsupported span, say 10 feet (3 m) with nothing under the middle, bounces when a loaded hand truck crosses it. That bounce is normal engineering rather than a defect, but it feels wrong underfoot and it works on welds and hinge pins over years.

Then there are the jobs aluminum is simply wrong for. Skid steers, pallet jacks with a full load, and anything with steel wheels or sharp edges will gouge a punched surface and overload a light ramp. Welding and grinding sparks melt through thin aluminum. Long spans over a ditch want a mid-support or a different structure entirely.

Light is a feature right up until someone carries it away.

Heat is the other thing nobody mentions until July. Bare aluminum in direct sun gets hot enough to sting through thin clothing, and a dark anodized finish runs hotter than a mill finish. If the ramp sits in full afternoon sun and gets used by bare legs and hands, a lighter finish is the kinder choice.

Weight ratings and the margin you actually want

Every aluminum ramp has a rated capacity, and that rating is a static number set by the manufacturer. A 600 lb (272 kg) rating covers most wheelchair users and their chair with room left over. What it doesn’t cover is a 200 lb rider bouncing a 500 lb machine onto the ramp from six inches up. Dynamic loads are larger than static ones, which is why the smart move is to buy above your heaviest realistic total instead of exactly at it.

Read what the number describes. Some ramps list a per-ramp capacity, others list a pair capacity, and a few list one figure that assumes you’re using two ramps with a machine on both. Buying two 400 lb ramps doesn’t give you 800 lb of combined capacity in any dependable sense, because the load rarely splits evenly.

Width belongs in the same conversation. A walker needs about 26 inches (66 cm) of usable surface. A wheelchair wants 30 to 36 inches (76 to 91 cm) so the user’s hands clear the rails. A UTV wants 40 to 50 inches (102 to 127 cm) depending on track width. Usable width means inside the rails, not the overall footprint on the shipping label.

Then inspect what you bought, once a season. Bent side rails, hinge pins with visible play, cracks at a weld toe, or a missing safety pin all mean the ramp comes out of service. Aluminum doesn’t rust through quietly the way steel does, so the failure you’ll actually see is mechanical, and it shows up at the joints.

Keep the rating label legible or photograph it. Six years from now, nobody remembers whether the ramp in the shed was rated for 600 lb or 400 lb, and that’s exactly when a heavier chair shows up in the family.

Portable, folding, modular, or fixed

A threshold wedge is set-and-forget. It lives on the step, gets swept with the porch, and you stop thinking about it. A single-fold aluminum ramp is the trunk-and-back-seat option: unfold, hook, roll, fold, done. A multi-fold or modular system breaks into sections so one person can carry each piece and a long run doesn’t need a truck. Telescoping ramps adjust to different tailgate heights, which is handy if you haul more than one trailer.

Weight decides whether a portable ramp actually gets used. A 6 foot (1.8 m) folding ramp often lands around 30 to 40 lb (14 to 18 kg). That’s a one-person lift for most adults. If a ramp takes two people and a coordination conversation, it lives in the garage and the chair goes back to the steps.

Permanent installs are a different animal. You’re anchoring into a deck or a concrete pad, setting transition plates so the chair’s casters don’t catch, keeping drainage away from the bottom edge, and thinking about thermal expansion on a 90°F afternoon. In snow country you also want to plan where the shovel goes. Renters and HOA members should get written permission before anyone drills a hole, because “I’ll put it back” rarely survives an inspection.

Match the ramp to how often you move it, then buy the lightest thing that still carries the load. The full range of configurations is laid out in the shop if you want to compare shapes side by side.

Look at the hinge before you look at the color. A folding ramp is only as good as the pin and the latch that hold it open under load, and a loose latch turns a rigid slope into a hinge that folds at the worst moment. Ask whether the hinge takes a pin, a spring latch, or a bolt, and whether you can replace the pin without replacing the section.

Setup details people skip

The top plate is where most installs go wrong. It should rest flat on the landing surface, with the lip sitting on the floor rather than on the door sill, or the door will drag and the ramp will rock. Check the door swing with the ramp in place before you drill anything. Then check it again with a chair on the ramp, because the frame moves a little under load.

Anchor the bottom. An aluminum ramp that creeps backward an inch every time a chair goes up will eventually leave a gap at the top, and the gap is where casters catch. Use the manufacturer’s pins, straps, or anchor kit. On a trailer, strap or pin the ramp so it can’t kick out when the machine’s weight shifts forward. Chock the wheels, set the parking brake, and have a second person watch the first loading if you’ve never done it.

Weather care is simple and boring. Rinse road salt off in spring. Sweep leaves and sand out of the punched holes before the rainy season instead of after. Keep steel fasteners from sitting in trapped water, since mixing steel and aluminum in a wet joint is a slow corrosion experiment. In ice country, clear the ramp and use sand rather than rock salt where you can, because salt spray finds every crevice.

Five minutes with a broom beats a season of rust.

Two habits keep a ramp usable for years. Clear it before the first freeze instead of after, because ice that forms in punched holes is much harder to shift than leaves. And when you put it away for winter, hang it rather than stacking it on the floor, so the bottom edge doesn’t sit in meltwater for four months.

Don’t repurpose it. A ramp holding a ladder, a plank, or a stack of firewood is a ramp that’s carrying side loads it was never designed for, and the deformation that comes out of that stays.

What to ask before you order

For a home installation, ask how the ramp ships. Anything past about 6 feet usually moves by freight, and freight to a residential address often needs a liftgate or a driveway appointment. Ask whether the hinge pins and safety hardware come installed, what assembly is left for you, and what the return policy says about a ramp you’ve already rolled a chair over.

If you’re buying for a dealer, a rental fleet, or a contractor working outside the US, the questions change. Ask about minimum order quantity, how the sections stack for container loading, and whether the finish is mill, anodized, or powder coated, because those three behave differently in coastal air. Ask for salt spray results and packaging details for sea freight. For wheelchair-carrying equipment, the relevant reference points are ISO 7176 and EN 12183; for aluminum structures, EN 1090. A factory that answers those questions with documents is a factory worth a second email.

Custom work is where an aluminum ramp stops being a catalog item. Rise and run you measured, a width that fits a specific machine, a hole pattern that matches your deck, your own branding on the side rail, and a lead time you can plan a job around. Ask about spares too, since hinges, pins, and rubber feet are the parts that wear out first.

Send the rise, the run, the load, and a photo of the spot. That’s enough for most sizing conversations to happen in one reply instead of six. Check the crate or carton before you sign for delivery, since freight damage on long aluminum sections is common and a signed clean receipt is hard to argue with later. The factory background explains how custom runs work, and the blog has more on slope math and loading practice. If your numbers don’t fit a standard size, say so early. A ramp sized to the actual step is the only kind that gets used twice.