Quick question about filter fabric at footings
Quick question about filter fabric at footings
(OP)
Should filter fabric be allowed to extend underneath the footing as shown in the first image (pink)? I feel like I would want to prevent that for some reason. So the second and third images show my own guesses. Although I'm not sure why; bearing pressure is what's important for a wall footing right, not so much shear friction on the underside or anything like that?
Structural Engineering Intern






RE: Quick question about filter fabric at footings
Structural Engineering Intern
RE: Quick question about filter fabric at footings
I don't agree with any of the three sections. Filter fabric belongs on the outside face of the wall and over the weeping tile.
What is the purpose in placing filter fabric between the granular fill and the natural soil on the right or under the footing or under the weeping tile?
BA
RE: Quick question about filter fabric at footings
I'm not sure what the purpose is but the website I provided shows fabric all around the granular fill, even between the fill and natural soil. So you wouldn't agree with these images?
I've never seen these before and just started doing research because of an RFI.
Structural Engineering Intern
RE: Quick question about filter fabric at footings
BA
RE: Quick question about filter fabric at footings
Structural Engineering Intern
RE: Quick question about filter fabric at footings
RE: Quick question about filter fabric at footings
Why would you place the filter fabric on the exterior face of wall?
RE: Quick question about filter fabric at footings
RE: Quick question about filter fabric at footings
If the virgin soil is relatively impervious clay, the majority of surface runoff should be removed by proper grading of the site. The small amount of weep water which finds its way through fissures in the soil to the wall should be led directly to the drainage tile using filter fabric.
If the virgin soil is a well draining granular material, I wouldn't use filter fabric at all.
BA
RE: Quick question about filter fabric at footings
RE: Quick question about filter fabric at footings
Thaidavid
RE: Quick question about filter fabric at footings
Structural Engineering Intern