I understand how nails obtain their pullout resistance in fibrous materials like wood, but I see workers driving nails through wood into concrete. How does the cement prevent pullout?
In: Engineering
Due to the way they are designed, masonry nails are usually made of hardened steel and have a fluted or twisted shank, which helps them grip the concrete more effectively.
Keep in mind that a correct installation of nails should not hold things in the direction in which the nail is pulled out, or at least not directly.
In most cases, you want your nails to hold two surfaces tightly together and avoid any sliding movement. The medium is not critical in that case, as long and the nail stays in place.
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If you have 2 or more nails at an angle to each other they don’t need to grip the concrete the rigidity of the nails holds it.
Nails in concrete almost never need to hold pressure that pulls them outwards but pressure that pulls them in a 90° angle downwards. And now the pressure themselves into the concrete hole they are in.
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