Why depth matters
A soft surface helps absorb impact, but only if it is deep enough. Loose fill compacts, scatters and decomposes, so a surface that started deep can become thin where kids land most.
Common guidance for typical home equipment heights suggests about nine inches of loose-fill when freshly installed.
Different materials, different behavior
Engineered wood fiber knits together slightly and holds up well. Wood chips, shredded rubber and sand behave differently. Pea gravel moves easily and can be hard to walk on.
Bonded and poured surfaces do not compact the same way but have their own maintenance needs.
Where it wears first
Depth drops fastest under swings, at slide exits and at the base of ladders. Check those spots first and top them up.
Rake the surface level after heavy use or rain.
How to measure
Push a ruler or marked stake through the material down to the base at several spots. Compare the depth to your target and mark a line on a post as a quick visual cue.
Do this at the start of each season and after storms.
Borders and base
A border holds the material in. A weed barrier and a draining base reduce weeds and puddles. Keep the surface clear of debris and pet waste.
We install borders and bases as part of surfacing projects.
Make a depth marker
Paint a line on a post or add a marked stake at the target depth so you can see at a glance when a spot has worn thin. Under swings and at slide exits the line will drop first.
Keep a small stack of material on hand so you can top up as soon as you notice.
Choosing between loose fill and bonded surfaces
Loose fill is simple and cost-effective but needs care. Bonded surfaces such as poured rubber are firm and accessible and need less topping up, but cost more up front and have their own repair needs.
The right choice depends on the equipment height, the budget, accessibility needs and how much upkeep you want to do.
Quick answers
How often do I top up wood fiber?
Check each season and add as needed, often once a year or more in busy areas.
Is rubber mulch any better?
It lasts longer and does not decompose, but it still needs depth, a border and checks.
