Inspecting/testing foundation

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Old 01-25-10, 08:58 AM
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Inspecting/testing foundation

Hello;

I have a friend buying a house...it's about 5 years old. He asked me to take a look at it and the foundation. appears fairly sound. One thing that I saw him do was 'scratch' the foundation wall with his fingernail.

He said someone told him this is a positive indication of cement strength.....I find this hard to believe.

I tried his method and found that....with some effort, I could leave a mark and 'dig' in a little bit...especially in the 'divits' left by the foundation forms.

Any thoughts before I call his bluff??
 
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Old 01-25-10, 09:43 AM
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Installations, Maintenance and Repairs.

Not really meaningful, since you are looking at abrasion resistance and not compressive strength. He is really referring to concrete and not "cement", which is a dry powder.

I know some older people that have very hard fingernails that might even scratch steel.

A house does not weight much even with people in it. The only concern would be the lateral load on the wall and it takes very little concrete strength to transfer the loads in to the steel that provides tensile/flexural strength to the wall.

If he is worried about the wall strength he should contact an engineer before making a big investment.

Is he actually buying without a home inspection? A home inspector should flag any questionable items and suggest a specialist, if needed.

Dick
 
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Old 01-25-10, 10:20 AM
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Thanks Dick...I will let him know, and collect my 50 bucks worth for the bet!
 
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