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Posted by on August 10, 2006, 10:48 pm
Have obtained 2 bids for an approx 3400 sq ft driveway
Both bids specify 4" of 4000# concrete, finished and sealed, with sawed
control joints. One bid specifies 6x6 6 ga. wire reinforcement, the
other specifies 3/8" rebar 3' on center. Would one be preferable to
the other? Is 4" enough thickness, for a residential driveway? I'm in
Indiana, so winters almost always have a couple of periods where the
lows are below zero.
Existing driveway is gravel, depth unknown, about 5-6 years old.
Getting pretty weedy.
The bids vary a lot, one being $4.60/sq ft the other about $3.10.
Anything else to consider, or ask for clarification on? Neither bid
mentions much about excavation and sub-grade prep, though it was
discussed verbally with both contractors.
Allan
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Posted by dave on August 11, 2006, 5:47 am
go with the welded wire mesh and pick up some #4 bar from lowes or
wherever put some bars where the street transition is and the garage
entry and if you park your truck outside around where the tires are. If
you have a culvert under the driveway put some in there as well. I also
live in Indiana. Expect your property taxes to go up in 2 years as
well. Rebar is cheap and not rocket science to put down. One word of
warning the mesh MUST be pulled up into the concrete, leaving it flat on
the ground is useless
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Posted by Kickstart on August 11, 2006, 9:02 am
>
> Both bids specify 4" of 4000# concrete,
> Existing driveway is gravel, depth unknown, about 5-6 years old.
> Getting pretty weedy.
>
>
> Anything else to consider, or ask for clarification on? Neither bid
> mentions much about excavation and sub-grade prep, though it was
> discussed verbally with both contractors.
>
> Allan
>
6" works best if your long term and don't want cracks
Wire mesh or fibremesh equal
Rebar on thickened perimeter and @ tie in areas
No decision as to removing the gravel ?
Concrete should be over compacted soil with vapor barrier although driveways
don't necessarily need the vapor barrier
kickstart
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Posted by Jonny on August 11, 2006, 9:03 am
> Have obtained 2 bids for an approx 3400 sq ft driveway
>
> Both bids specify 4" of 4000# concrete, finished and sealed, with sawed
> control joints. One bid specifies 6x6 6 ga. wire reinforcement, the
> other specifies 3/8" rebar 3' on center. Would one be preferable to
> the other? Is 4" enough thickness, for a residential driveway? I'm in
> Indiana, so winters almost always have a couple of periods where the
> lows are below zero.
>
> Existing driveway is gravel, depth unknown, about 5-6 years old.
> Getting pretty weedy.
>
> The bids vary a lot, one being $4.60/sq ft the other about $3.10.
>
> Anything else to consider, or ask for clarification on? Neither bid
> mentions much about excavation and sub-grade prep, though it was
> discussed verbally with both contractors.
>
> Allan
>
Thickness is adequate for standard residential automobile traffic. But, not
concrete trucks or heavily laden delivery trucks like one delivering topsoil
to the place for instance.
You should have perimeter beams for both water erosion protection, and when
your car may drift off the perimeter of the driveway.
Be sure the apron at the street is well reinforced with rebar as the pointed
edges seem to want to break off first. Be sure the street apron provides
drainage for the shoulder, not diverting water on your property. If the
street has a curb, be sure the curb is replaced properly.
Don't sign anything unless the party specifies excavation and preparation,
and cleanup afterwards. This should also include topsoil replacement where
the forms were removed.
--
Jonny
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Posted by inspector.terry@gmail.com on August 11, 2006, 7:19 pm
allan230@mailinator.com wrote:
> Have obtained 2 bids for an approx 3400 sq ft driveway
>
> Both bids specify 4" of 4000# concrete, finished and sealed, with sawed
> control joints. One bid specifies 6x6 6 ga. wire reinforcement, the
> other specifies 3/8" rebar 3' on center. Would one be preferable to
> the other? Is 4" enough thickness, for a residential driveway? I'm in
> Indiana, so winters almost always have a couple of periods where the
> lows are below zero.
>
> Existing driveway is gravel, depth unknown, about 5-6 years old.
> Getting pretty weedy.
>
> The bids vary a lot, one being $4.60/sq ft the other about $3.10.
>
> Anything else to consider, or ask for clarification on? Neither bid
> mentions much about excavation and sub-grade prep, though it was
> discussed verbally with both contractors.
>
> Allan
Allan, The APWA suggests that 4" is not a sufficent depth for vehicle
traffic and that 6" be installed. However, many 4" drives have been in
for years without major problems. If #4 bar is installed it must have
3" of cover between it and the earth. It must also have 1 1/2" minimum
cover over the top. This would be 3 + 1/2 + 1 1/2 or 5" minimum.
Mesh can be used, however it is hard to get it into proper placement
and keep it there. If mesh is used i would suggest that mat and not
roll material be used and that you get chairs to maintain proper
placement.
Bar can then be placed at the perimiter and dowled and epoxied into
existing concrete at locations where the concrete depth can be made to
accomidate.
Terry
Combination Building Inspector
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