Fill concrete gap to install garage threshold?

[smokey1856]

So I have a 3" gap between my concrete driveway and concrete garage floor for expansion. It is much larger than I have seen for expansion joints. It also has some semi soft material in it, but not filling the gap. The gap lines up to where my garage door meets the floor when down. So the garage door actually slides into the gap, but it is not a tight seal. I am in the process of preparing to lay vct in the garage and want to put down a 3.5" rubber threshold. *@#$The problem is with such a large gap and where it is located, I have no way to support under the threshold, nor a way to secure it to the floor.*@#$

Any ideas on how to address so I can out down the threshold to give my soon to be new floor a finished look? *@#$Thanks.*@#$

 

[930dreamer]

The garage door shouldn't close into the gap, that's for sure. Is this new construction? No expert but sounds like the area needs a new pour. Can you post some pics.

 

[Crizzle]

Have any pictures?

 

[jimp]

Pictures will help. My slab has a recess that my door closes into. It is almost 2" by 4" with a soft seal for the door to close and seal.

 

[LegacyIndustrial]

Pictures will help. My slab has a recess that my door closes into. It is almost 2" by 4" with a soft seal for the door to close and seal.

If you decide to fill it and want it to last and never give you a problem, then choose an epoxy based concrete mortar/patch, not a cementitious product.

http://legacyindustrial.net/cart/epoxy-concrete-patch-1-gal-hd110-p-6.html

 

[smokey1856]

 

[LegacyIndustrial]

Looks like a moisture trap, I'd fill it

 

[Hammerdown]

What about installing a trench drain? I've seen the plastic (polymer) style used in home garages in that spot. They come in varying width's and can be cut to length.

 

[smokey1856]

Looks like a moisture trap, I'd fill it

So you recommend filling with one of the epoxy based mortars you mentioned earlier? Would I just fill it completely with that or should anything else go in the gap, like I was seeing people mentioning foam backer rods in expansion joints. Would I then be able to attach a garage threshold over top of this mortar after it cured? How much would you recommend to fill, 3" wide x 8' ft long? Thanks.

 

[jkeyser14]

More importantly... Why the heck is there electrical connections made with wire nuts and then a wire running through the trench? You have a garage door closing on that wire and have debris and possible water in the trench. That is asking for a fire or accident.

 

[smokey1856]

More importantly... Why the heck is there electrical connections made with wire nuts and then a wire running through the trench? You have a garage door closing on that wire and have debris and possible water in the trench. That is asking for a fire or accident.

Not electrical connections, it is actually speaker wire - so no fire potential there.

 

[Printer Mike]

Does the outside slab have a slightly lower elevation? You actually may have a good thing. My inside slab extends beyond the door, so in a blowing rain I get water inside.