How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Rick Your Own Question

Rick
Rick, General Contractor
Category: Home Improvement
Satisfied Customers: 13786
Experience:  Licensed construction supervisor with 35+ yrs. experience.
94766
Type Your Home Improvement Question Here...
Rick is online now
A new question is answered every 9 seconds

I AM INSTALLING A 2 POST AUTOMOTIVE CAR LIFT IN MY GARAGE AND

Resolved Question:

I AM INSTALLING A 2 POST AUTOMOTIVE CAR LIFT IN MY GARAGE AND WOULD LIKE TO POUR 2 NEW SLABS FOR WHERE THE LIFT WILL BE ANCHORED DOWN(APPROX 3FT X 2FT) I HAVE 4IN OF EXISTING CONCRETE, ABOUT 5 YEARS OLD. I CAN HANDLE THE CUTTING AND DIGGING, BUT I DONT KNOW MUCH ELSE. CONCRETE NEEDS TO BE AT LEAST 300PSI.

THANKS XXXXX XXXXX XXX@XXXXXX.XXX
Submitted: 4 years ago.
Category: Home Improvement
Expert:  Rick replied 4 years ago.
Hi dan

You mean the concrete needs to be at least 3000 psi. You should make your footings at least 2' x 2' and 12" thick. In the footings you should put 2 layers of 3/4" rebar in a checkerboard pattern with the squares ~6" square. Try to determine where your bolts for your lift will fall so you can avoid putting rebar right where the bolts will go. You might want to set the top of the footing even with the bottom of your existing slab so you can pour a finished slab on top.
Customer: replied 4 years ago.

What I really need to know is the type of cement, and if I should put some form or expansion material around the outside between the new and old concrete. And should I drill into the old cement and rebar it to the new?

Expert:  Rick replied 4 years ago.
The footings I described should not need to be connected to the existing slab. Be sure to set your footing on undisturbed soil. You don't need an expansion joint but an expansion joint will stop the rest of the slab from cracking if your footings settle. Sakrete high strength concrete mix (I'm assuming you are going to mix this by hand) will give you 2500 psi after curing for 7 days and 4000 psi after 28 days. Of course if you are getting ready mix delivered (this won't meet anybody's minimum delivery) you just tell them what strength mix you want. If you don't want to wait 28 days (actually more like 14 days) then you would need to use Sakrete 5000 plus which would give you 3500 psi in 7 days but this product is much more difficult to find. If the soil these footing are sitting on is at all questionable then increasing the size of the footings to 3' x 3' or larger may be necessary. 3' square footings should be more than enough for most circumstances.
Rick, General Contractor
Category: Home Improvement
Satisfied Customers: 13786
Experience: Licensed construction supervisor with 35+ yrs. experience.
Rick and 3 other Home Improvement Specialists are ready to help you

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy Bagley, IA
< Last | Next >
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy Bagley, IA
  • Thank you for the expeditious answer. It's good to know you're out there and awake in the wee hours when I finally have time to ask questions about my Jenn Air. Jean Riverhead, NY
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
 
 
 

Meet The Experts:

 
 
 
  • The Home Smithy

    Home Builder

    Satisfied Customers:

    2002
    #1 Home Improvement Expert 30+ years experience
< Last | Next >
  • http://ww2.justanswer.com/uploads/TH/TheHomeSmithy/2011-8-13_11146_homesmithy.500x500.64x64.jpg The Home Smithy's Avatar

    The Home Smithy

    Home Builder

    Satisfied Customers:

    2002
    #1 Home Improvement Expert 30+ years experience
  • http://ww2.justanswer.com/uploads/BS/bshull17/2011-2-11_04125_japic.64x64.JPG Brian's Avatar

    Brian

    Architect

    Satisfied Customers:

    1967
    Licensed Architect- 16 years, L.E.E.D. AP
  • http://ww2.justanswer.com/uploads/ST/Steve555/2013-6-14_144343_Depositphotos4247517S.64x64.jpg Steve G.'s Avatar

    Steve G.

    Handyman

    Satisfied Customers:

    135
    VP of electronic repair company and home theater advisor.
  • http://ww2.justanswer.com/uploads/ER/Erdaram/2011-6-21_14724_ANIEric4Pics.64x64.gif Eric M. Bright's Avatar

    Eric M. Bright

    We Don't Comprehend the Word Can't!

    Satisfied Customers:

    1734
    I've been been doing things for my clients that others have said cant be done for over a 1/4 Century
  • http://ww2.justanswer.com/uploads/rich03dungo/2010-3-17_101556_tshirt2.jpg Rich's Avatar

    Rich

    Home Improvement Enthusiast

    Satisfied Customers:

    674
    Over 35 years construction and home maintenance experience
  • http://ww2.justanswer.com/uploads/AL/alumalite/2012-5-10_234018_shutterstock506249951forJA500.64x64.jpg Phil's Avatar

    Phil

    Mechanical Engineer

    Satisfied Customers:

    409
    Retired contractor, 51 years experience
  • http://ww2.justanswer.com/uploads/JE/jerrymassie/2011-1-15_45937_1111055.64x64.JPG Jerry's Avatar

    Jerry

    hearth products

    Satisfied Customers:

    317
    owned and operated stove retail and service 12 yrs