Filter fabric Filter fabric is a permeable geotextile placed between soil and aggregate to separate materials while allowing water to pass through. It helps maintain the integrity of the pavement foundation.
Without filter fabric, fine soil particles can migrate into the aggregate base and reduce drainage over time. By separating the different layers, the fabric helps preserve structural support and extends pavement life. It is commonly used where soil conditions or drainage concerns make additional stabilization beneficial.
Frequently Asked Questions About Filter fabric
What is filter fabric?
A permeable geotextile placed between soil and aggregate that separates the layers while allowing water to pass through.
Why is it used under pavement?
Without it, fine soil particles migrate up into the aggregate base, clogging it, reducing drainage and weakening support over time.
When is it worth installing?
Where soil is fine-grained or soft, where drainage is a concern, or where the base must stay clean to perform for the pavement's life.