×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Parking Garage/Covered Parking Slopes

Parking Garage/Covered Parking Slopes

Parking Garage/Covered Parking Slopes

(OP)
To all;

I have a quick question.  I have a design that the architect presented to me.  He has designed a hospital that will be raised and is in the form of the letter T.  The parking underneath the top portion of that T I have been able to maintain 1.5% to 2.0% slope to catch basins.  However the right side of that T at the base, has been a little tricky.  The bare minimum slope that is available is 0.7% from the concrete to the paving and then 1.5% to a series of catch basins.  In any of your experience, do you see that this 0.7% is a problem?  Again it is going to be well covered and we might get some rain that is blown in but I doubt it will be that much and then carry over from cars driving underneath.  Also, the other side of that T is well sloped at 1.5% or better.

What do you great guru's think?

Runoff

RE: Parking Garage/Covered Parking Slopes

Poured concrete, screed finished or better at .007, then bituminous concrete at .015?  There will be no problem draining either.

Engineering is the practice of the art of science - Steve

RE: Parking Garage/Covered Parking Slopes

If you have frost conditions and the garage is non-heated, then you should be looking for a minimum slope of 1-1/2% to minimize 'skating' areas.  You may also have problems with tolerances in the pour leading to 'flat' areas.

Dik

RE: Parking Garage/Covered Parking Slopes

(OP)
I know but it will be impossible to get 1.5% inside this section of the garage.  I had to come and reanalyze from the original engineers design.  I am bareley getting 1.5 in some areas and bare minimum at a low portion of the parking is as low as 1.2%.  

I agree with you on the skating portion.  That is what I am really worried about.  I liked the screed finish idea by Steve which will get the minor flows out of there.  If it does flow to the other side, then there will be more of a slope in that area.

Runoff.

RE: Parking Garage/Covered Parking Slopes

I've always gone with a bare minimum slope of 1.00-1.50% on asphalt (depending on the contractor) and a 0.5% slope on concrete.

If it's concrete and you have a nice finish on it, 0.7% shouldn't present any problems.  

Some good contractor can lay asphalt at 1.00% for short stretches without creating "bird baths" or "skating areas", however, I think that is the exception more than the rule.  I try to keep it at 1.50% in areas that will be seeing significant runoff.

Peace,
Stoddard

RE: Parking Garage/Covered Parking Slopes

I try to maintain the 1-1/2% just for liability reasons.  I don't have my hands on it now, but I have a couple of articles on this as well as copies of various cities building by-laws regarding slopes.

Dik

RE: Parking Garage/Covered Parking Slopes

(OP)
Thanks everyone.  With the agreement of the owner, contractor, architect and myself, we went ahead with the 1.2% design.  The funny thing about it is that we are only talking about 2600 to 3000 square feet of parking area that we are worried about.  I had the superintendent of the job out there and myself as the paving contractor layed the paving.  He did an excellent job.  We ended up getting 1.3%.  The architect changed up his plans and the covered parking will have coverage of 24 to 26 feet with concrete paving at 0.5 to 0.65%.  Not what I really wanted but it will work.  I do not think any rain will get in there anyway.

Thanks again.  

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources