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-   -   Exterior stair landing tread size min/max? (http://www.diychatroom.com/f19/exterior-stair-landing-tread-size-min-max-128653/)

jackwashere 01-03-2012 01:57 PM

Exterior stair landing tread size min/max?
 
This is regarding exterior stairs that lead to inswing doors in a house. The riser/tread ratio is 7.5"/11". At the very top one would think that the top tread should be larger than 11" to allow for some space to allow a person to fiddle with keys or what not while trying to open a locked door. Are there minimum and maximum tread sizes for the top aka landing tread? Any recommended comfortable sizes? Can the top landing tread just be a regular sized tread, ex 11"?

rossfingal 01-03-2012 03:08 PM

It's considered good, practice to have a landing - 3' X 3' minimum, at the
top of stairs.
Even if the door on the house, swings into the house - you or someone else
may decide to put an out-swing, storm-door on.
When we run into this situation (if we have the room) - we put a 3' X 4'
landing on.
(If it's a single door - 3' wide - 4' away from the house)
It makes it easier to "negotiate" the storm-door.

rossfingal

titanoman 01-03-2012 08:56 PM

http://www.inspectapedia.com/interiors/Stair_Codes.htm

Many places require the landing to be as deep as it is wide.
I think the attached is NY.

Sent from a Samsung Galaxy S2

mae-ling 01-03-2012 08:58 PM

Here our minimum is 3' by 3', which I find small.

Gary in WA 01-03-2012 09:52 PM

R311.3 Floors and landings at exterior doors. There shall be a landing or floor on each side of each exterior door. The width of each landing shall not be less than the door served. Every landing shall have a minimum dimension of 36 inches (914 mm) measured in the direction of travel. Exterior landings shall be permitted to have a slope not to exceed 1/4 unit vertical in 12 units horizontal (2-percent).” From; http://publicecodes.citation.com/ico...011_par002.htm

http://publicecodes.citation.com/ico...011_par003.htm

Check with your local AHJ.

Gary

jackwashere 01-04-2012 09:14 PM

OK if this 3'x3' landing is in the air, which it is, since it's the top step, how thick of a concrete slab should I use? I'm thinking of using 2x8's for the form. Would 2x6's do or is that too thin? Also, do I need to place columns underneath it, or will the stairs with #5 and #4 rebar every 6 inches suffice?

mae-ling 01-04-2012 09:17 PM

If I understand you correctly you are pouring your own concrete steps and landing?
Will they be filled in to the ground or open underneath?

jackwashere 01-04-2012 11:42 PM

Open underneath. So should the slab under the 3x5 landing be 6" or does it have to be 8" thick? Do I need columns under a free standing 3x5? On the one side the slab will be held up by a wall and on the other stairs at a slant (roughly 45 degrees). #4 and #5 rebar already extends out from the wall. The wall has already been built.

rossfingal 01-05-2012 05:33 AM

"jackwashere"

Do you have plans/permits for this?
We've done something very, similar to what you propose -
we had, "Detailed" plans, signed off by an Engineer.
Considerations for the size and the placement of the rebar are crucial!
Were there existing, concrete stairs there, before?

rossfingal

mae-ling 01-05-2012 01:39 PM

Never have build my own that where open underneath. You can buy them and they attach to the concrete basement wall. The used metal underneath.

jackwashere 01-05-2012 02:07 PM

The plans call for compacted fill with 4" thick concrete and rebar #3 every 24". The plans show the side view without showing how the walls on the sides of the stairs should be built. So the plans are incomplete. Either way the inspector will come and see the form that I prepare and it will either fly with him or not. He never looks at the plans anyway. He has his own set of rules that he abides by.

I have #5 and #4 rebar spaced every 6 inches and coming out of the retaining wall that the house will be built on and I want to use 6" or 8" thick concrete for the slab. I will probably end up sticking two concrete form tube columns underneath the slab to help hold it up. I'll stick a few rebars in them and that will be it.

AndyGump 01-05-2012 05:21 PM

I can not say that I understand what this project is supposed to look like but it sounds like you are headed for trouble.

Could you post a sketch or something that will describe the landing and steps in a little more detail?

Are you talking about a homemade, 8" thick suspended slab for the landing?

Very troubling.

Andy.

jackwashere 01-05-2012 06:38 PM

2 Attachment(s)
OK Andy, attached are two pix. The first is the plans. The second is how I want to do it.

AndyGump 01-05-2012 06:50 PM

I see, this is certainly beyond conventional light frame construction or what is prescriptive in the latest IRC.

Get some engineering for this idea.

Or go with wood.

Andy.

jackwashere 01-05-2012 07:17 PM

I gave it some thought and decided I'll just go with the path of least resistance. Which means I'll stick to the plans.


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