Concrete Over Asphalt?

Heefs Home Impr

I usually renovate indoors, and have a request to demo a garage currently sitting on ashpalt with the walls built over cement blocks.

The customer wants to expand the footprint.

He asked if it would save money to pour cement over existing asphalt.

I believe the long way around is the short way home.

Remove the existing,dig for footings and foundation wall for frost, add gravel and rebar for the new floor.

What do you think?

Thanks,Rob

Steve Manning

The asphalt and its base (if thick enough for what the concrete base section calls for) would be adequate to pour on. Saves the owner demo cost and cost of base material and placement.

ruskent

What will he save 1000 bucks?

tgeb

I would NOT do this, unless I could get a good layer (3" to 4") of stone over the asphalt. But that would require raising the elevation. Otherwise I would tear it out.

But I am no engineer.

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Tom

www.gebcon.com

dayexco

i'm no engineer/architect....but were this MY building, i'd be saying NO WAY!

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someday, i'll be as patient as Nick.

jmic

Good answer!

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___"Remember You Never Get A Second Chance To Make A First Impression"______________________
Joe

Heefs Home Impr

My initial reaction was to remove and replace everything , same as interior renos.It rarely pays to goof around with square pegs and round holes eh?
The customer asked me to look into it though , I value this site for the expertise and appreciate your time.
I will start fresh and build on new footings,foundation so I can see it standing square in the future.

Thanks

Steve Manning

here is a link to a page from the portland cement association website covering this topic. The process is called whitetopping

http://www.concretethinker.com/Papers.aspx?DocId=12

Blackhammer

I thing the asphalt is the problem. Asphalt sub-base is great for pouring concrete on when compacted properly.

Vinny

I did this at my shop. I poured an 8" slab with rebar over an asphalt floor.

There was no reason to remove the asphalt as we wanted to raise the elevation anyway.

To date, no adverse effect and its been about 5 years. I would say as long as the aspahlt and its base are sustantial, it should be fine.

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Roccies Asphalt Paving
The Right Way Driveway Company
If you say you cant, your a loser. If you say you wont, your a quiter. Which one do you want to be?

maverik

Hi all, I am really glad I found this forum, we are a small concrete business, no pavers just concrete but we do well. I am loving this concept of whitetopping and actually did a small experiment project on a friends property that had a small asphalt area in the back, to me and anyone I show the comments are always very good, especially the "green" aspect of this, I am wondering if it's worth it to expand my business and try to get into this area and promote it. With all the talk of "green" alternatives to everything, this looks to have a great future. But I mainly do residential, so that will be a problem unless I hit the people with asphalt driveways and that will be small jobs. Do I still need to use 4250 PSI concrete ? What about permits, I am in an area with some tough regulations so I can predict a lot of paperwork. Wondering if it's worth it for me to look into this more. Any thoughts??