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-   -   Build stairs to basement (none exist) (http://www.diychatroom.com/f19/build-stairs-basement-none-exist-96206/)

jaketoolson 02-22-2011 11:57 AM

Build stairs to basement (none exist)
 
We purchased a new home a little over a year ago in in Northern California. The builder added a 'basement' to the home, but its unfinished and only accessible from outside the home (i.e. you have to walk into the backyard in order to get to it). Well I really want to add stairs from inside the home down to the basement and am wondering if this is something I can do myself from a cost stand point.

The biggest obstacle I see is the support beams we'd be cutting into run perpendicular to the "hole" we'd be cutting and I'm not sure how to reinforce them.

Any help and suggestions would be appreciated as to how I should go about this.



http://jaketoolson.com/misc/basement_plans.jpg

http://jaketoolson.com/misc/basement5.jpg

mrgins 02-22-2011 01:42 PM

you'll need to put in a double header to cap the end of the cut joists. Use joist hangers to support them. You will also need a 4x4 post below the point where the last uncut joist meets the doubled header. That hole may also need to be turned into an L shape if you don't have room to put the stairs in in one run and have to turn them

jaketoolson 02-22-2011 01:43 PM

Thanks for the reply mrgins. Do you think this idea is feasible and the layout works?

rditz 02-22-2011 02:19 PM

can you turn the opening 90 degrees so that you have less floor structure to modify?? you are going to need at least the the same distance as the width of your stairs at the bottom and top as an ending point to turn and exit/enter the stairs.

i recommend you research stair building so they come out to your expectations... you will have to do some basic math and take into account anticipated flooring changes upstairs or downstairs that may affect final step heights.

it is definitely a diy project.

rod

jaketoolson 02-22-2011 04:02 PM

By rotating 90 degrees, do you mean something like this?

http://www.mustknowhow.com/wp-conten...entStairs2.jpg

mrgins 02-22-2011 06:19 PM

Quote:

Originally Posted by jaketoolson (Post 595804)
Thanks for the reply mrgins. Do you think this idea is feasible and the layout works?

It's very feasible, but the main thing to watch is the headroom. Google "stairs" to see what the requirements are for basement stairs. I believe it's 6'-8" from the top of the tread to the bottom of the ceiling directly above it. Use scrap wood to lay it out before you cut thru the floor. Good luck

wombosi 02-22-2011 06:37 PM

definitely doable.

double header across the cut joists, and also double the joist that the header connects to.

you'll need to construct a temporary support in the basement before cutting the joists.

lay this out carefully though. as others have said, make sure you can fit stairs in the opening that leave enough headroom at the bottom.

easy layout from underneath with a laser level and some careful measurements.
building the stairs will be the easy part, believe it or not.

fungku 02-22-2011 06:41 PM

Quote:

Originally Posted by jaketoolson (Post 595902)
By rotating 90 degrees, do you mean something like this?

http://www.mustknowhow.com/wp-conten...entStairs2.jpg

that's 180 (a.k.a. "u-shaped"). you could potentially shorten the hole in the floor if you needed to by turning 90 (aka "L-shaped").

http://4.bp.blogspot.com/_HUZNqTmmdA...RkTwtB8/s400/2
I don't know your code, but here is that if the header joist span is over 3.2m (10'-6") the header joists need to be engineer spec. And if the header joist is over 2m (6'-8"), the trimmer joists need to be engineer spec.

Joe Carola 02-22-2011 09:07 PM

Quote:

Originally Posted by rditz (Post 595829)
can you turn the opening 90 degrees so that you have less floor structure to modify??

You have more work that way because you have to make the opening L-shaped and have to support the inside corner of the opening where it turns 90.

The way the OP has it is the easiest way to do it.

federer 02-22-2011 10:32 PM

this is a neat project-i want to see how it turns out!

fungku 02-22-2011 10:59 PM

Quote:

Originally Posted by Joe Carola (Post 596127)
You have more work that way because you have to make the opening L-shaped and have to support the inside corner of the opening where it turns 90.

The way the OP has it is the easiest way to do it.

he might have meant running the stairs so the long side would be the trimmer joists.

rditz 02-23-2011 08:26 AM

Quote:

Originally Posted by jaketoolson (Post 595902)
By rotating 90 degrees, do you mean something like this?

http://www.mustknowhow.com/wp-conten...entStairs2.jpg

no, I meant in reference to your first sketch, turning the stairs 90 degrees so they were under the window..

rod

rditz 02-23-2011 08:32 AM

Quote:

Originally Posted by fungku (Post 596198)
he might have meant running the stairs so the long side would be the trimmer joists.

yes that is what I meant.

that is how the stairs in my house were run and it meant that only 1 floor joist was cut out and the header was only supporting that one joist.. no temp wall was needed while rebuilding stairs.

I guess that because there is access from outside, these stairs will not have to accommodate carrying things like appliances, etc.

rod

tpolk 02-23-2011 09:23 AM

you need a minimum of 3' finished clear landing top and bottom of stairs. is there enough space on your first drawing

mrgins 02-23-2011 10:26 AM

Quote:

Originally Posted by Joe Carola (Post 596127)
You have more work that way because you have to make the opening L-shaped and have to support the inside corner of the opening where it turns 90.

The way the OP has it is the easiest way to do it.

Joe is right. Making a square opening will be a lot easier for a first time DIYer.


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