Stair Tread Thickness?

No, you can't use 3/4" plywood or 1x12. Code requires a minimum thickness of 1" (FULL inch) for stair treads. Most people use tread stock or 2x12 for the treads. Hope this helps.

Stair Tread Thickness

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Stair Tread Thickness?

I'm building stairs for the interior of my house. 7 5/8 Rise - 10 Run. The stairs will be carpeted. Before I calculate the stringers, I need to know the tread thickness. Can 3/4" plywood be used? Or 1x12 (3/4" thick). Or does it need to be thicker?

Thanks in advanced.

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See if you can buy half round the same thickness as the treads. You can nail this on the end that sticks out. Then with a rasp round the corner. This can also cover where the balustrades come down from the hand rail.

Woodtick is right. Code calls for 5/4 (1" thick) or 2 x (1 1/2" thick). You will be replacing anything else...by the code official or because it broke apart.

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That's plenty thick for a standard stair. 20mm thick will span 450mm.

If you want a really solid stair then brace it up too or line under with chipboard.

3/4 should do the trick on a standard 36 or 42 inch wide staircase with a double stringer.

Don't forget the tread nosing with radius.

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