Return to the Home Repair Forum | Post a Follow-Up

basement stairs

Posted by michsully (My Page) on
Sat, Jan 3, 09 at 11:35

hi I need help with basement stair code questions. I am replacing a basement stairway in the Kalamazoo, Michigan area that has 2 x 10 treads that require a 8-1/4 tread cut. Will I be required to enlarge the cut to 9 inches and use 2 x 12 to meet code or will a 8-1/4 cut with 2 x 10 suffice for basement stairs?
I need to make a winder due to room size constrictions. Do the three winders need to have 6 inches at the narrow end or can they come to a point as long as I have 9 inches at a 12 inch travel point from the inside?

Follow-Up Postings:

RE: basement stairs

This link might be usefull.

RE: basement stairs

From a Code point of view:

Michigan currently uses the 2003 International Residential Code if I understand correctly.

Under the 2003 IRC, MAXIMUM riser height for any stair is 8 1/4"...

MINIMUM tread depth is 9"...

Winders require a MINIMUM tread depth of 6" at any point.


From a carpentry point of view:

NO ONE uses anything less that 2x12s for stair stringers under any circumstance.

RE: basement stairs

The 2003 IRC limits stair risers to a maximum of 7 3/4" and treads must be a minimum of 10".

Winder treads must be a minimum of 6" at any point but also a minimum of 10" at a point 12" from the narrow side.

The size of the stringers depends on how far they span and if they are supported against walls.

 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!

Return to the Home Repair Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.

Learn more about in-text links on this page here