planning/cost stage questions

[pmalavolti]

i'm just trying to get a good estimate right now, but would a monolithic slab be enough for a garage with room-in-attic trusses to add a man cave in later or should i go full foundation. im in central illinois if that make a difference.

 

[Notch1988]

The biggest thing I find is, what's the norm for your area? Out here most garages are done with a monolithic pour with a thickened edge. If I were to ask for something different, like frost walls or grade beam, it would cost a LOT more since it's "different".

 

[brownbagg]

the slab itself does not support the weight of the bldg, that is all on the footers.

 

[pmalavolti]

either way is done here. i just don't know if monolithic would even be possible. i was thinking it would be cheaper is why i'm asking. i don't know anything of the framing or concrete work so i'm not sure if it can be done. like i said just starting the process and getting an idea of the budget.

 

[pmalavolti]

Anyone know if monolithic be OK?

 

[pmalavolti]

bump for answer

 

[Nighttrain]

I think you answered your own question, "it would be cheaper" if you plan on keeping the place for a while and meet local codes you should talk to the building department. Just a slab without footers is probably not the way to go for anything more than a simple one story garage. Even then with the frost line and heave you have up there it will not last a life time.

 

[pmalavolti]

I think you answered your own question, "it would be cheaper" if you plan on keeping the place for a while and meet local codes you should talk to the building department. Just a slab without footers is probably not the way to go for anything more than a simple one story garage. Even then with the frost line and heave you have up there it will not last a life time.

my question is if a 2-level building with living space above can be supported on a monolithic. that has not been answered.

 

[sands35]

Anyone know if monolithic be OK?

That depends on your local codes inspector. Your municipality should have that information published. At least in SE Michigan, a slab is ok for sub 600 sq ft structures. Above that they require a 42" footing or a frost protected foundation (but every builder in this location doesn't know what that is). Pole constructions is OK too, but again, 42" frost line.

Slabs are used all the time for 2 story construction in areas that are not prone to frost. I.e., SW United States.

 

[Steevo]

Monolithic pour just indicates that the slab and footers are poured all in one. The depth and width of the required footer trenches around the perimeter and under any weight-bearing structure locations needs to be determined based on the size of the building and weight of that structure.

 

[dunnit]

we weren't allowed a monolithic on the building were are currently building. had to pour footing and short wall....and whatever your figuring for cost....double it....lol just in case

 

[pmalavolti]

we weren't allowed a monolithic on the building were are currently building. had to pour footing and short wall....and whatever your figuring for cost....double it....lol just in case

was that because of the building not supporting it or the codes not allowing monolithic

 

[dunnit]

I want to say it was p&z....it would be worth a call or visit or talk to your concrete person

 

[kristoreie]

Even then with the frost line and heave you have up there it will not last a life time.

 

[pmalavolti]

Even then with the frost line and heave you have up there it will not last a life time.

so your saying do the full foundation. i'm staying at this residence for ever. i'm only 38.

I want to say it was p&z....it would be worth a call or visit or talk to your concrete person

trying to not take the word of the contractors. not all of them know. i work for the local law enforcement. i see a lot of customers coming through saying they are contractors and i don't think they would honestly know what is best. just what is quickest and most profitable.

 

[pmalavolti]

well, the first bid for concrete came in. i had him price it both ways 26x30 slab is 3100 26x30 foundation is 4900. poured thick for my lift and a rat wall. he said a foundation is not needed. but again i'm wanting expert opinions from here. i hate having to take the word of the guy doing the work.

 

[readhead]

I'm not sure you understand what a monolithic slab is. You are going to excavate for a footing all around the floor area and pour the slab and stemwall all at once. It should be less expensive since you will not have to over excavate and backfill and prep the floor area.

 

[LB-1911]

well, the first bid for concrete came in. i had him price it both ways 26x30 slab is 3100 26x30 foundation is 4900. poured thick for my lift and a rat wall. he said a foundation is not needed. but again i'm wanting expert opinions from here. i hate having to take the word of the guy doing the work.

As mentioned previously you need to inquire at the local bldg dept to see what they have to say.

Your city and or county bldg dept carry more weight that "expert opinions from here"

What was the depth and width of the footing?
What was the width and thickness of the stem wall?
What was the depth and width of the rat wall?
Overall thickness ?

Central Illinois .... Peoria County?

Planning & Zoning: Information Library
http://www.peoriacounty.org/planningandzoning/files/?path=/Building+Diagrams

Garage over 600 sq ft
http://www.peoriacounty.org/downloa...agrams/Garage+over+600+sq+ft+and+attached.pdf

 

[readhead]

Are you providing approved plans for these bids or just asking for a number? Without plans you are going to get numbers all over the map. Does your town or county require permits? If so that is going to dictate what you are going to do and how the plans will be prepared.

 

[pmalavolti]

I'm not sure you understand what a monolithic slab is. You are going to excavate for a footing all around the floor area and pour the slab and stemwall all at once. It should be less expensive since you will not have to over excavate and backfill and prep the floor area.

i understand what is.

 

[pmalavolti]

As mentioned previously you need to inquire at the local bldg dept to see what they have to say.

Your city and or county bldg dept carry more weight that "expert opinions from here"

What was the depth and width of the footing?
What was the width and thickness of the stem wall?
What was the depth and width of the rat wall?
Overall thickness ?

Central Illinois .... Peoria County?

Planning & Zoning: Information Library
http://www.peoriacounty.org/planningandzoning/files/?path=/Building+Diagrams

Garage over 600 sq ft
http://www.peoriacounty.org/downloa...agrams/Garage+over+600+sq+ft+and+attached.pdf

tazewell county. yes i know they dictate everything. rat wall will be 4x4. 2x4 wall construction.

 

[pmalavolti]

Are you providing approved plans for these bids or just asking for a number? Without plans you are going to get numbers all over the map. Does your town or county require permits? If so that is going to dictate what you are going to do and how the plans will be prepared.

yes he was given plans and shown where i want it and i pointed out where the rain drains off the land next to mine. i will be getting the permit. basically i am asking if a monolithic will support it. zoning being left out of it. again, i know zoning will dictate it but i want to know if they concrete guy tells me its good, and its not, he wont get hired. because i don't know, i'm asking the experts here.

 

[sberry]

What can it hurt to take a spin around the planning dept and see if they are any help.

 

[readhead]

Functionaly there is no differance between a mono pour and footing, wall, slab construction. Some building departments frown on monolithic construction. You should find out from the building department if it is ok.
You said you already have plans. Are you looking to change the plans for cost reasons?

 

[HoosierMark]

I just ask a concrete contractor almost the same question. He was more concerned about insulating around the perimeter. You may want to factor in if you plan on heating the garage area and how you can insulate the perimeter. He recommended the footer and short wall with typical framing if I was going to heat it and use it as a workshop. This would allow me to insulate the perimeter and not have the cold temperatures transfer in. Point being while some methods are cheaper then others in the short run, in the long run they may be more expensive to heat. My location is SE Indiana.

 

[pmalavolti]

What can it hurt to take a spin around the planning dept and see if they are any help.

they were not. just a bunch people pushing papers.

 

[nolimits76]

I think the term monolithic is being used improperly here. By definition, it just means you will pour said slab in ONE pour vs multiple pours.

Typically construction joints (break in pours) is done for the convenience of the contractor and does not affect overall strength as long as your reinforcing is properly done. In fact, multiple pours is required in our line of work so that beam loads are properly dispersed when pouring the bridge decks.

What you are really asking is can a slab with thickened edges be acceptable in lieu of a traditional slab with true concrete footer. If it was mine, I would do a real footer, end of story.

No idea what residential guys are charging for their work. My company does bridges, and with our form work, labor, etc we have higher costs I imagine. For materials & labor, we range $400-600/cy depending on specifics.

 

[pmalavolti]

got a chance to walk into zoning. i found out why they were so elusive on answering my questions and refering me to the county website. they just pretty much take my word for everything. no codes on full foundation or slab. she warned me that jan 1st they are changing all the codes.

 

[GYPSY400]

An "engineered" mono slab should be ok... my garage is 24x36 and there is rebar in the thickened perimeter and screen across the middle. . I think the edges are 14" thick.

 

[pmalavolti]

An "engineered" mono slab should be ok... my garage is 24x36 and there is rebar in the thickened perimeter and screen across the middle. . I think the edges are 14" thick.

how far apart is the rebar in your slab

 

[GYPSY400]

how far apart is the rebar in your slab

Looking at this picture I think it was about 30" spacing for the stirrups. Then there was 2 rows along the bottom of the stirrup, and 2 rows along the top. This is the 36 foot wall.

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