PVC Conduit Through Cement (Cinder?) block wall Sealing

[pelletman]

Can someone tell me what is the best product to use to seal up a piece of conduitt going through a block wall?

Thanks

 

[mike93lx]

How big of a gap? If it is small, I use silicone. If there is a lot of material to replace, I'll use redi mix concrete patch

 

[dave*99]

Best is subjective. This hydraulic cement works. As does silicone.

 

[FredWanaker]

fire barrier needed? Water barrier? or just air intrusion and bugs?

 

[mm08822]

Hydrualic cement both sides. Once patched, asphalt roofing tar (from a tube) on the outside if below grade.

 

[egdede]

I might use a poly-urethane sealant. If there us any movement it is less likely to shear the conduit off.

 

[The Cobbler]

above or below grade?
how big conduit?
how big a space needs to be filled?

 

[pelletman]

How big of a gap? If it is small, I use silicone. If there is a lot of material to replace, I'll use redi mix concrete patch

Well it will be me making the hole, thanks for the input!

 

[pelletman]

Above grade, basically to protect against air and bugs I would say. It is a basement wall and the basement is cement block. I will be drilling the hole for the conduit and I am thinking maybe 1/4" larger than the conduit

 

[mike93lx]

Well it will be me making the hole, thanks for the input!

Either drill from both sides or from the side that matters to control blow out

 

[thammel]

Often copper wool is used. Animals won't chew through it. I used spray foam.

 

[Jim greengo]

Thum gum.

 

[Crazyjake8493]

Duct seal or silicone. If it's a really big gap, either spray foam and/or hydraulic cement depending on aesthetics.

 

[rooster59]

Copper wool

 

[pelletman]

Thanks everyone! I can pick the hole size so I am hoping I don't have too much gap to fill