Geotextiles/Filter Fabric

Filter fabric separates ballast stone from the insulation on a protected membrane roof (Left side of picture).

Here you can see filter fabric being used to protect the EPDM membrane from the ballast stone on a ballasted EPDM roof.

Useful Links:

1. General: For a quick overview of filter fabrics/geotextiles see this Wikipedia page. Not really anything here about the function of filter fabrics in roof construction, but it does give you an idea of what they are.

2. SafetySee this Material Safety Data Sheet for health and safety information about filter fabric at the Henry Company websiteThis is only an example and other products and brands may be different.

3. Technical: To see how filter fabric fits into a vegetative roof assembly (sometimes called a "green roof") see this page at the Whole Building Design Guide site.

4. Technical: Protected membrane roof (PMR) or inverted roof membrane assembly (IRMA): the Dow Chemical Corporation shows how filter fabric fits in on this page.

5. TechnicalSee this Product Data Sheet for the technical characteristics of filter fabric at the Henry Company websiteThis is only an example and other products and brands may be different.

6. See here for filter fabric/geotextile manufacturers.