GBA Logo horizontal Facebook LinkedIn Email Pinterest Twitter Instagram YouTube Icon Navigation Search Icon Main Search Icon Video Play Icon Audio Play Icon Headphones Icon Plus Icon Minus Icon Check Icon Print Icon Picture icon Single Arrow Icon Double Arrow Icon Hamburger Icon TV Icon Close Icon Sorted Hamburger/Search Icon

Community and Q&A

How to seal penetrations in filter fabric?

Debra Graff | Posted in General Questions on

I would like suggestions for how to properly seal gaps or penetrations in the filter fabric that is surrounding the foundation drainage system of a home.  

Our contractor is placing our main SDR 35 yard drainage pipe inside the gravel “burrito” surrounding our foundation drain (to avoid having to dig a separate trench for it).  

We will have 5 catchment basins in the yard, with individual drain pipes joining the main drain pipe. These 5 side pipes will need to penetrate the filter fabric to join the main line. The contractor just plans to slit the filter fabric all the way up in order to join the side pipes to the main one.

These 5 open slits in my filter fabric leaves me very concerned that our shrink-swell clay subsoil will eventually seep through the slits and clog up my foundation drain.

Of course, we’ll also have penetrations through the fabric for our sewer, water, and other drain lines.  Any suggestions on how we can better seal these slits in order to reduce that possibility? Or is this not an issue? Thanks!

GBA Prime

Join the leading community of building science experts

Become a GBA Prime member and get instant access to the latest developments in green building, research, and reports from the field.


  1. User avatar GBA Editor
    Martin Holladay | | #1

    Q. "Or is this not an issue?"

    A. In my opinion, this is not an issue. If you are worried, overlay a small (16" x 16") square of filter fabric on top of the worrisome area, as a second layer, to provide some overlap. Then sleep well at night and worry about more important concerns.

  2. Debra Graff | | #2

    Thanks, Martin.

Log in or create an account to post an answer.


Recent Questions and Replies

  • |
  • |
  • |
  • |