*Help* Building up existing foundation?


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Old 07-26-08, 10:16 PM
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*Help* Building up existing foundation?

I have an 8 inch by 50 inch foundation I need to build up about 2 inch.( to match another a bit higher)
I plan to build a plywood frame. Next I plan to use a mixture of 50% cement and 30%-50% sand , then pour and level. Before hand I am going to rough up existing surface and put a few protruding threaded bolts for the project at hand.
Any advise I may be overlooking
Should I use any special cleaner on existing surface or just clean and rough out best I can?
thanks
 
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Old 07-27-08, 05:28 AM
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if you only need to go up about 2 in, use pressure treated 2x8 and anchor it to the existing foundation. portland and sand will not give you a strong foundation. that high a amount of portland will make it very brittle and easy to crack. if you insist on useing concrete use a more conventional mix but drill and anchor to the existing foundation befor pouring to allow your bolts to have the strength for a good hold down.

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Old 07-28-08, 10:25 PM
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what would be the best mix?

If you dont agree with the portland and sand.what would be the best mixture.
Are you suggesting Quickcrete??
I was just trying to avoid the bigger stone (in that mixture) to try and get a smoother finish.
thanks
 
 

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