Concrete Overlay

[nomadskidoo]

Have a 100 year old barn,56'x48' wanting to "Overlay" 6" concrete over 2"X4'x8' styro insulation?Maybe drill down for footings,every 8' then fill,then overlay?Seems no-one likes doing this &I know I'll get "drilled"on this subject!Take out all old concrete then new concrete?Thanks for reading,

 

[lakeroadster]

Sounds like a neat project.

What is the thickness and condition of the existing concrete?

Are you planning to install any reinforcing steel in the new 6" slab?

 

[nomadskidoo]

Original floor is 5"&I'll install "Rebar"& use the fiberglass(insert) concrete,I think 100 years the floor is "Settiled"by now?Thanks for the input!

 

[tlmartin84]

I think it sounds like a solid plan.

What are the foundations for????

 

[Shootinok]

not unlike a walk in freezer floor, but they would not be 6" thick. Yours should be an awesome floor. I don't see any reason you'd get drilled for the idea.

 

[nomadskidoo]

Foundation would be for a Hoist,,there's a manure troth (about 2'x8" tallx40') to fill that area up with rebar,(& put in pipe for a floor drain)then 1 level floor with insulation,that should help in heating shop of winters in midwest.Then saw cut every 10' thanks for the great ideas!Possible go with 2 upstair floor levels for storage it's all wide open.

 

[Chris705]

I remember my dad struggled with his old lower level of the farm barn....it had a long section of cow stantions and another row of walled off stalls. Only the cow stantion area had concrete down and it was at two different levels separated by the manure trough. The concrete that the previous farmer had poured many years ago was super thick and really hard to get out. We removed a portion to gain head height.....were I am going is that the concrete had been placed over a rock pile and very poor subgrade....it was probably a mixture of manure/straw/oats/grain and hay....we also mucked out one of the stalls. It was an bottomless pit of organic material (had to be careful to not undermine the stone foundation wall w/o a footing)... ONLY for these reasons would I be hesitant to overlay....But if the current slab is good in appearance, not full of cracks, spaulling or soft in nature I would not hesitate to overlay. Also make sure any wooden support posts are not rotted. Jack and add a pier footing as need to prevent future settlement of the columns. Good luck with your project!