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RE: Friction coefficient

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I am not aware of anything that would give you the coefficient of friction you are seeking. The only ones of which I am aware are posted in the Prestressed Concrete Institute handbook. The following values include concrete:

Elastomeric to steel or concrete               0.7
Laminated cotton duck fabric to concrete  0.6
Concrete to Concrete (smooth surfaces)   0.6 to 0.8
TFE to TFE                                           0.05
Hardboard to concrete                           0.5

I think that you could use 0.5 as a lower bound. Do not forget using a safety factor predicated on your confidence of the coefficient of friction.

Harold Sprague

From: Tarek Mokhtar <tarooky(--nospam--at)>
Reply-To: <seaint(--nospam--at)>
To: <seaint(--nospam--at)>
Subject: Friction coefficient
Date: Wed, 13 Sep 2006 11:59:20 -0700

I have a basement mat footing that sits on top of a waterproofing membrane, on top of a 3" slab on grade. what friction coefficient would you use at the bottom
of the footing?


Tarek Mokhtar, SE

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