Why should an adult never slide with a child on their lap?

Because the child's foot can catch on the chute wall while the adult's weight keeps moving. The leg twists and the adult's body drives the rotation, which is a recognized mechanism for a lower leg fracture in toddlers. A child sliding alone weighs too little to generate that force. If a child is nervous, walk beside the slide instead.

How hot can a metal slide get?

Hot enough to cause a contact burn in seconds. Bare metal and dark plastic in direct summer sun reach surface temperatures far above air temperature, and young skin burns faster than adult skin. Check any chute with the back of your hand before a child uses it, and prefer shaded siting or light colored materials in hot climates.

Is a 30 degree slide angle a maximum or an average?

An average over the whole chute. The CPSC handbook recommends the slide incline average no more than 30 degrees, which allows a steeper section in the middle as long as the run as a whole stays within it and the exit region flattens out. A uniformly 30 degree chute and a steep drop with a long flat run out can both comply.

Are tube slides more dangerous than open slides?

They are not inherently more dangerous, but they fail differently. You cannot see a child inside one, they hold heat, they collect water and debris, and a child stopped partway is invisible from below. Tube slides need a minimum interior diameter of around 23 inches and they need a supervision plan that covers the exit as well as the entry.

What should I check at a slide exit?

Surfacing depth first, because the exit is where loose fill scours out fastest and where children land hardest. Then the exit height and whether the run out is still roughly level, since frost heave and settlement change both. Finally the exit lip and chute joints for cracks, sharp edges and backed out fasteners.

Slide safety: angle, exit height, tube slides and burns

The geometry that makes a slide safe

The CPSC handbook recommends a slide chute whose incline averages no more than 30 degrees¹. It is an average over the length of the chute, not a cap on every section, so a steeper middle with a long flattening run out can comply while a uniformly steep chute cannot.

Three other geometric rules do most of the safety work:

Sidewalls at least 4 inches high along the entire inclined section of an open chute, so a child cannot come off the side mid descent.
A continuous, smooth chute. Joints between sections sit flush and face down slope, fasteners are recessed or capped, and there is nothing standing proud that could catch clothing.
A run out at the bottom that decelerates the child before the surfacing has to.

The exit region

The exit region is the flat section at the bottom, and it has specific numbers in the 2010 handbook¹:

Measure	Requirement
Exit region length	At least 11 in, roughly horizontal
Exit height, slides 4 ft high or less	No more than 11 in above the surfacing
Exit height, slides over 4 ft	Between 7 in and 15 in above the surfacing
Exit use zone	Equal to the slide platform height, minimum 6 ft, maximum 8 ft

Slide exit dimensions from the 2010 CPSC handbook. Confirm against the current ASTM F1487 edition for equipment you are signing off.

The lower bound on the taller slides is there for a reason. An exit that sits flat on the ground plants a child's feet and folds them forward. An exit that is too high drops them. The band between 7 and 15 inches is the window that lets a child stand up out of the slide under their own control.

Exit height is also a maintenance number, not just a design number. It is measured to the surfacing, so it changes every time loose fill scours out or settles. A slide that left the factory at 12 inches can be at 16 inches after two seasons of erosion at the exit, which is exactly the spot where the fill disappears first. Surfacing upkeep covers the top up routine, and the depth and fall height chart tells you what depth to restore it to.

The top of the slide

The slide entry deserves more attention than it usually gets, because it is where a standing child is at full fall height.

A platform at the top, level with the chute entry, big enough to sit down on. The 2010 handbook specifies a minimum platform length in the direction of travel of around 22 inches.
Guardrails or barriers according to the platform height and the age group, exactly as set out in guardrails and barriers.
A hood, bar or shaped entry that makes a child sit before they enter the chute. This is the part that stops head first descent and standing descent, and it is also the part most often removed or broken on older equipment.
No protrusions of any kind on the hood, the entry or the transition. This is the single highest risk location on a playground for clothing entanglement, because a child is about to move downward with their weight unsupported. See protrusions and entanglement for the test.

Tube slides

A tube slide needs a minimum interior diameter of around 23 inches so a child cannot become wedged and so an adult can reach in¹. Beyond that dimension, tube slides bring four issues that open chutes do not:

You cannot see inside. A child who stops partway, climbs back up or is distressed is invisible. Supervision has to cover the exit as a separate position, not just the entry.
They hold heat. A closed tube in the sun becomes an oven, and the interior surface stays hot long after the air cools.
They collect things. Water, leaves, sand, glass and animal waste all end up at the low point. Tube interiors need checking on the weekly route.
Impacts are enclosed. A child who loses control inside hits a hard surface rather than coming off the side.

None of that makes a tube slide a bad choice. It makes it a choice with an operating cost. Slides compares types and what each one needs.

Embankment and spiral slides

Embankment slides follow a slope, with the chute set into or onto the ground so there is very little fall height at any point. The handbook's rule is that the chute should sit no more than 12 inches above the slope surface¹. They are one of the best value moves on a sloped site: high play value, minimal fall height, no guardrail requirement, and surfacing needs driven by the low chute height rather than by a tall deck. The trade off is drainage, because water runs the same route the slide does.

Spiral slides add a rotational component that a child has to manage while already moving. The handbook treats a single turn spiral as generally suitable for preschool age children and reserves multi turn spirals for school age, since younger children are more likely to lose posture and come off the side. Exit orientation matters too: a spiral throws a child out at an angle, and the exit use zone has to be measured from where they actually leave.

The heat problem

A slide chute in direct sun is a contact burn risk. Bare metal is the worst case, and dark colored plastic is not far behind. Skin contact burns depend on surface temperature and contact time, and a young child's skin injures faster and at lower temperatures than an adult's.

The detail sits in heat and burn risk, and the design response in shade and heat design and shade structures. Material choice drives most of it: materials, steel, wood and plastic sets out how each behaves in sun.

The lap sliding fracture

One mechanism is worth naming because it is common, preventable and almost entirely caused by well intentioned adults.

When an adult slides with a toddler on their lap, the child's foot or shoe can catch on the chute wall or floor. The child's leg stops while the adult's body weight keeps moving down the slide, and the combined mass drives a twist through the lower leg. The result is a lower leg fracture in a child who would not have generated anything like that force sliding alone. It is a well recognized pattern in pediatric orthopedics, and the injuries are usually to children under about four.

The alternative is simple: let the child slide alone and stand at the exit to catch them, or walk alongside a low slide holding a hand. If a child is too young or too anxious to slide alone, they are too young for that slide. Supervision covers the other habits that actually change outcomes, most of which are about position rather than attention.

What to do next

If you are inspecting, measure exit height and surfacing depth at the exit first, because those two numbers change fastest and matter most. If you are specifying, decide the slide type before the deck height, since an embankment slide can deliver the same experience with a fraction of the fall height and a much smaller surfacing bill. And if you are supervising, stand at the exit rather than at the top: that is where the next child lands.

Slide safety