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-   -   Sealing around concrete form openings (http://www.diychatroom.com/f19/sealing-around-concrete-form-openings-57945/)

blue_can 11-25-2009 12:58 PM

Sealing around concrete form openings
 
I'm about to pour some concrete for a small wall footing. I have run some piping (landscape irrigation PVC piping as well as electrical conduit - gray PVC) through openings in the form and these will be embedded inside the footing. I'm wondering how best to seal around the gaps between the hole for the piping in the forms and the pipe itself to prevent wet concrete from seeping out during the pour. Would some outdoor silicone be sufficient or should I be looking at something stronger.

Bondo 11-25-2009 02:29 PM

Ayuh,... Don't bother... It won't seep much anyways, the aggregate will plug it up...

Gary in WA 11-25-2009 02:42 PM

If its a big hole, some tin screwed to the inside form would work, or 1/4" ply. Usually, you set a section of pipe cut to the wall or footing form thickness with nails through the outside form to hold it in place. After removing the forms, install a smaller size pipe through the concreted one.
Be safe, Gary

Maintenance 6 11-25-2009 03:20 PM

If it's for a footer, nobody will see it. If you make it too tight, you just make the forms harder to get off. Unless the holes are way over cut, it won't make a difference. The concrete won't leak out very much.

blue_can 11-25-2009 06:40 PM

Okay thanks for the replies. It is not overcut by much - about 1/4". I'm not concerned about the look since nobody will see it. I was more concerned about too much concrete seeping out and affecting the level but I guess the aggregate will plug it up anyway.


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