How Do I Fasten The Lower Section of A Stairway To A Wood Framed Floor?

The most common construction method used for securing the lower section of the stair stringer to a wood framed floor, will be to toe nail or nail through the stringer at about a 45° angle, into the subfloor.

In the illustration above, the stair stringer is sitting directly on top of a sheet of oriented strand board, ready to be nailed, after it has been positioned properly.

The illustration above provides you with an excellent example of how the nail should be positioned and driven through the subflooring.

I usually start the nail about an inch above the subflooring and place it against the wood stair stringer at or about 45° and then drive it through the stringer and into the subflooring.

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