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Help - Driveway slope for new house and parking pad

 
Old 06-06-2019, 02:55 PM
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RecruiterRick
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Default Help - Driveway slope for new house and parking pad

1. To reduce number of steps into house from garage I am asking builder raise garage level. Without raising garage this is a non issue.
I am hoping someone that is much smarter than I on this topic can answer this quickly as I need to make a go no go on driveway issue quick.

From the measurements I was given it will be about 1.5 in/ft. drop over 23 ft the incline would be 7.1 degree. It will be about a 36 in drop in total
do I have other questions I need to ask?
From eye balling some finished driveways in neighborhood it looks like the above should be OK but would be a major problem if my eye ***** are wrong!

Will this work for C7 Z06's? we have 2 - both my wife will have one. I have an ACS splitter stage 1 on the front of mine hers is stock.

2. Also, due to lot size and easements there is limited space to place a pad next to driveway (extend the driveway width to easement line)
we will have little to no extras space to say have tires on grass - with the raised driveway there would be a drop at the easement line
How wide does a pad need to be practically park to Z06 (or my DD would be similar size)
The pad would slope down the same as driveway above.
Thank You
Rick
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Old 06-06-2019, 03:21 PM
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aj98
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Roundabout answer: my house is a corner lot - on a hill. The road is sloped about 8 degrees, and has a 4 degree crown.
The elevation change from from street to garage is approx 7-1/2 ft.

I can fit a 2LT C7 (No side skirts or add on splitter), base C5, and a minivan (with walking space between) in my driveway...so a 7-1/2 ft drop over 3-1/2 carlengths..

IIRC, The "level" app in my iphone said the apron of my driveway is about 8 degrees, the bottom section of my driveway is about 16 degree, the middle is 11 degrees, and the top is about 8 degrees. The garage itself is 0.
The 16 degree slope + apron is about the same length as the minivan.

At an entry (or exit) approach of 30-45 degrees, the wind deflector on the bottom of the nose will drag on both the 7 and the 5 about 1/2 way up the 16 degree portion of the driveway... The nose/body proper does not drag on that 16 degree angle or across the transition from the 16 to 11 degree section.
No issues on the 11 degree section, and no bottoming out from the 8 degree section to the garage.

to that end, I would think you would likely be ok on a 7 degree angle.

Of course, if you know your neighbors, you can always measure/test their driveway...
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Old 06-06-2019, 03:34 PM
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aj98
thank you for a very detailed thoughtful answer - as you say it does sound like my slope should work fine......hoping to hear others chime in with the same answer
i think they will try to make mine reasonably straight incline vs dips But they probably do not know until the do it

This is new construction and do not know neighbors But also I was afraid if I drove up one of the driveways I would not get back down without damage - "scarety cat" i am with the cars
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Old 06-06-2019, 07:16 PM
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owc6
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In my experience, it's not the incline, but the transition that may pose problems.
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Old 06-06-2019, 09:15 PM
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makes sense I suppose ...probably why I find myself doing much more angled transitions here in Chattanooga as there are some older streets on hills that are not corvette friendly
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Old 06-06-2019, 09:40 PM
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Angle in (head in), angle out (backing) --- the slower you go (to minimize loading the suspension) and flatter the angle the better --- especially with a Stage II/III front splitter.

Last edited by Range_Rat; 06-06-2019 at 09:42 PM.
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Old 06-06-2019, 09:43 PM
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Originally Posted by owc6 View Post
In my experience, it's not the incline, but the transition that may pose problems.
Ask your asphalt or concrete contractor. These guys do very sophisticated slope calculations to make large parking lots drain correctly, and I'm sure that they can answer your question. (It should be included in the cost of the contract, no extra charge.) It's always good to hire actual expertise.


Last edited by fsvoboda; 06-06-2019 at 10:39 PM.
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Old 06-07-2019, 01:04 AM
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Originally Posted by Range_Rat View Post
Angle in (head in), angle out (backing) --- the slower you go (to minimize loading the suspension) and flatter the angle the better --- especially with a Stage II/III front splitter.
I have Stage 3 Aero on my ZO6 and a mildly sloped driveway, the issue is not the slope, but the entry/exit over the drainage swale to the street. I find that slow speed and about a 45 degree angle gets it done without any scrapes.
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Old 06-07-2019, 07:08 AM
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My garage sits about 4 ft higher than where my driveway transitions up and I have no issues. Like mentioned before it has everything to do with the transition itself. These pics don’t really show how steep it is but my house sits about 20 ft above the road over 400 ft of driveway.

Last edited by JDSC7VETTE; 06-07-2019 at 07:09 AM.
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Old 06-07-2019, 07:15 AM
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One day you might wish that you had the extra ceiling height in your garage.



.
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Old 06-07-2019, 07:26 AM
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You bet !!
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