Calculating stair height and depth follows two simple rules: tread plus riser should be between 17 and 17.5 inches, or tread times riser should be between 70 and 75. Measure heights and depths for comfortable stairs with instruction from an experienced builder in this free video on carpentry.
What's comfortable, what's comfortable in stairs? I'm Robert Markey, I've been doing construction for many years, I'm going to talk to you about stair height and depth, essentially the height of the risers and the depth of the treads. Now in order for our stairs to be comfortable, there wants to be a proportion, a definite proportion between the height of the riser and the depth of the tread. There's a couple of formulas that we can use to determine that. The first is the riser plus the tread is between seventeen and seventeen and a half. O.k., let's see how we did ya. About a nine inch riser with an eight and a half inch, eight and a quarter inch, I mean a nine inch tread and an eight and a quarter inch riser. Nine plus eight and a quarter plus is seventeen and a quarter. Right on the money there. So this would be a comfortable, comfortable stair. O.k., the other way is the riser times the tread is between seventy and seventy five. So let's make that nine times eight and a quarter, nine time eight is seventy two and another and a half, so we're still in that ball park. O.k., so this officially is a comfortable tread and riser. Now what happens is if you've been in a let's say, a hotel where they have very long treads, you get these very small risers. You may have a fourteen inch tread and so you've got you know, three, three and a half risers. So you're going up in this long staircase. If you've got a basement stairs, that's very steep, you're going to have the opposite. You maybe have a five inch tread and maybe a twelve inch riser or seven inch tread and a ten inch riser. However you do this you want to have that, that formula, your riser plus your own is between seventeen and seventeen and a half and that means as you go up the stairs, it's comfortable. Steep is comfortable, shallow it's comfortable, pretty standard. Robert Markey and we've been talking about treads and risers for stairs.
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