Eco-Roofs Brochure and Specifications PDF - Eco-Roofs Green ...

Drainage Board ½” or 1” Prefabricated Composite
Drain board is usually made of fairly strong and semi-rigid plastic. It is designed to allow space for the free flow of
excess water to the roof drains. Drain board may also incorporate “cups” that would hold a certain amount of moisture for
added stormwater retention. Caution must be used with this type of retention material as it will add to the weight on the roof
and could present other complications with freezing, stagnant water, etc.
Drain board is not usually used with tray systems as the
tray incorporates these features into its design. They can be
used if the roof does not drain well or for added moisture retention
if done with caution.
In a built-up green roof, the drain board is usually the second
layer from the bottom, on top of the root barrier and below
the filter fabric.
Drain board often comes in a composite material with the
filter fabric and/or the root barrier fused to it. This is the material
Eco-Roofs offers.
TRAYS: Used only if specified or needed for additional
drainage or retention.
BUILT-UP: Used between the root barrier and filter fabric
or as a composite combining these layers.
Filter Fabric 4 or 6 oz. Non-Woven Geotextile
Filter fabric is used to keep the growing media and plants from washing away. It is used mostly in built-up systems
where it goes under the growing media and on top of the drainage layer. Extra should be ordered to allow for a minimum
12” seam overlap and to wrap up the sides, perimeter containment, edging, around drains, etc. The 4 oz. is usually adequate.
Heavier geotextiles can become clogged and slow the drainage of excess moisture.
Filter fabric is also used in tray systems to wrap edging and around drains and equipment when it is necessary to cut
the trays and leave the growing media exposed. Some tray systems have used a filter fabric inside the tray but Eco-Roofs
has found this can cause water to backup inside the tray and can kill the plants.
Filter fabric may come as the top material in a composite drain board layer (see gray layer above.)
TRAYS: Only necessary when using cut trays.
BUILT-UP: Holds in the growing media. Usually used directly below media and above the drainage layer.
Slip Sheet/Protection Fabric/Moisture Retention Mat 10 or 12 oz. Non-Woven Geotextile
This non-woven geotextile is heavier than the 8 oz. which means that it will absorb and retain a minimal amount of
water similar to a sponge. It can replace the 8 oz. for greater protection or it can be added to a built-up system for water
retention. For this use it is usually placed below the filter fabric and above the drainage layer. Order extra to allow for a 12”
seam overlap.
Caution should be used with any moisture retention mat. Retaining water on a roof can cause problems with drainage
especially when frozen and will increase the weight load on the roof depending on how much water is retained.
TRAYS: An option for heavier protection and moisture retention.
BUILT-UP: Moisture retention layer below filter fabric and above drainage layer.
Erosion Blanket
Biodegradable Coir Blanket
This is used for built-up green
roofs to reduce wind and other erosion.
It can be used to cover cuttings. Plugs
and plants can be planted through this
material. Purchase includes one biodegradable
stake per cubic yard. Additional
stakes (4” or 6”) can also be
purchased.
TRAYS: Not used, pre-grown
BUILT-UP: Above media
Phone: (269) 471-7408
Fax: (269) 471-2495
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Supplies