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-   -   How to fill in gaps under concrete form boards (http://www.diychatroom.com/f19/how-fill-gaps-under-concrete-form-boards-87516/)

spaceman spif 11-23-2010 12:39 PM

How to fill in gaps under concrete form boards
 
I'm going to pour concrete to extend my patio a few more inches into the driveway. I will be laying the form boards on my driveway, which is not level. The driveway has a gradual slope, plus a few small bumps here and there. How do I fill in the gaps under the form boards so the concrete doesn't run underneath them?

jlhaslip 11-23-2010 12:46 PM

6 mil poly stapled inside the forms

spaceman spif 11-23-2010 05:05 PM

Do I staple it all the way from top to bottom and leave a little extra hanging down to fill in any gaps?

itsreallyconc 11-23-2010 06:55 PM

or backup the outside of the forms w/dirt,,, its cheaper :yes:

spaceman spif 11-23-2010 10:18 PM

Quote:

Originally Posted by itsreallyconc (Post 539508)
or backup the outside of the forms w/dirt,,, its cheaper :yes:

Will that dirt be strong enough to prevent the concrete from sneaking through the gaps under the forms? Just curious because it seems like the concrete would be able to slowly push the dirt out.


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