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Safety Surfacing/Fall Heights
You must consider the type of safety surfacing you will use
before beginning the installation process. There are two
general types, organic/loose fill or synthetic unitary. Both
materials have advantages and disadvantages and it is likely
that your client’s budget will dictate the material of choice.
Always have all options available as product quality and long-
term performance may cause your client to reevaluate their
original budget.
When installing a unitary safety surfacing material such as
rubber mats or poured-in-place, you will need to pour a
concrete slab so that the rubber material can be secured. This
type of product cannot be placed on dirt.
If a loose fill surface such as wood chips is selected, you will
need to consider containment borders. There are many
products to choose from including hard plastic and natural
products such as wood. Creosoted railroad ties are NOT
recommended. Loose fill materials like wood chips are easily
displaced, so 12” deep is generally satisfactory. Also
remember that loose fill will compress with repeated use.
Weed mat: Some use a landscaping fabric material that allows
drainage but prevents weed growth. Weed mats are installed
after the structure is installed but before the resilient surfacing
is installed.
Borders: Building borders above ground, below grade, or on
grade depends upon the area in which you live. Assuming you
must use 12” of resilient surfacing, there are three basic types
of installation:
1. 12” below existing grade
2. 6” below and 6” above existing grade
3. 12” above existing grade
The tallest deck on the unit generally defines the maximum fall
height of a structure. If upper body equipment (horizontal
ladder) is attached, the fall height is then the distance from the
highest part of the equipment to the protective surfacing. Refer
to the Top Down View to determine the maximum fall height.
Since the structure will be installed at dirt grade, the height of
the resilient surfacing must be determined and factored into the
height of installation of decks. For example, if the resilient
surfacing will be 12” deep, a 3’ deck height will actually install
at 4’. When the structure is completed and the surfacing is
installed, the deck then will be 3’ above the level of the
resilient surfacing.
