Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Building & Construction

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 10-12-2010, 09:48 PM   #1
Newbie
 
Join Date: Oct 2010
Location: Canada
Posts: 4
Share |
Question

stairwell opening in wood joist floors


What do you do when the width of the opening of your new stairwell doesn't butt up against an existing joist! No opening has been cut yet...still in the planning stage of the game. We are converting our attic into a living space and need to install a stairwell. Our house is pretty old and the wood joists are 2"x10", 28" on center apart. The opening required is 5'-0" wide but this ends up between 2 joists. I'd have to put 5 trimmer joists to get to the next existing joist...there has got to be a better way to support the length of the opening!

Galatea is offline   Reply With Quote
Old 10-12-2010, 10:16 PM   #2
Member
 
Join Date: Dec 2008
Location: Fairbanks, AK
Posts: 1,847
Default

stairwell opening in wood joist floors


It sounds like you are walking up into the attic, parallel to the floor joists and will have to cut one floor joist off short and install a header. ???? I'm not sure I'm using the term "header" here correctly, but that is what I'd call it. You cut the joist, run a board or 2 perpendicular to it, and nail that to the joists on either side; the adjacent joists will now carry its load. (BTW: That may overload them, so have someone check out your plan. Any posts or supports for those adjacent floor joists going in to help them out?) Can't you just install a couple of blocking piece and run a board between it and your header, parallel to the floor joists? Maybe I'm not seeing what you are doing, but it sounds pretty simple; you are just hanging in a new, very short floor joist at the edge of the stairway opening. No? j

jklingel is offline   Reply With Quote
The Following User Says Thank You to jklingel For This Useful Post:
BigJim (10-12-2010)
Old 10-12-2010, 10:46 PM   #3
Member
 
jlhaslip's Avatar
 
Join Date: Dec 2009
Location: Canadian Rockies
Posts: 1,280
Default

stairwell opening in wood joist floors


The long joists are typically doubled with the "header" mounted using joist hangers.
The "header" is another double.
Also use a joist hanger to mount the cut joist to the backside of the "header".
Attached Images
 
__________________
Quote:
Originally Posted by Bud Cline View Post
Go ahead and apply for a variance, those guys at City Hall can use a good laugh.
jlhaslip is offline   Reply With Quote
Old 10-13-2010, 12:04 AM   #4
STAFF
 
BigJim's Avatar
 
Join Date: Sep 2008
Location: East Tennessee
Posts: 7,205
Blog Entries: 1
Default

stairwell opening in wood joist floors


Quote:
Originally Posted by jlhaslip View Post
The long joists are typically doubled with the "header" mounted using joist hangers.
The "header" is another double.
Also use a joist hanger to mount the cut joist to the backside of the "header".
Jl is right on with the drawing. A question for you, how long is the span that your joist make? 28 inches on center might be too much for your joist if the span is too wide. If it were mine I would put another joist between the existing joist.
__________________
New members: Please consider adding your location to your profile.

Jim
BigJim is offline   Reply With Quote
Old 10-13-2010, 09:28 AM   #5
Newbie
 
Join Date: Oct 2010
Location: Canada
Posts: 4
Default

stairwell opening in wood joist floors


future attic stairwell.doc

Here's a drawing of the existing joist and the location we're planning for our stairwell. Hope this help to better explain what we are dealing with.
Galatea is offline   Reply With Quote
Old 10-13-2010, 11:26 AM   #6
STAFF
 
BigJim's Avatar
 
Join Date: Sep 2008
Location: East Tennessee
Posts: 7,205
Blog Entries: 1
Default

stairwell opening in wood joist floors


There must be a wall somewhere supporting the joist. The only joist I have seen that long are engineered and you said it is an older home so chances are they aren't engineered joist. I am not trying to be picky but we need to know exactly what you have before we can offer advise.

One more question, what is the pitch of your roof? If you have the stairs too close to the wall the rafters rest on you may not have enough head room.
__________________
New members: Please consider adding your location to your profile.

Jim

Last edited by BigJim; 10-13-2010 at 11:32 AM. Reason: another question
BigJim is offline   Reply With Quote
Old 10-13-2010, 01:03 PM   #7
Newbie
 
Join Date: Oct 2010
Location: Canada
Posts: 4
Default

stairwell opening in wood joist floors


the walls beaneath (living room on main floor) are drawn in pink and . The roof pitch is 9:12. We are installing a pre-fabricated 48" spiral staircase. The celing height where the new stairs would exit onto the attic floor is 8'-0"
Galatea is offline   Reply With Quote
Old 10-13-2010, 01:05 PM   #8
Newbie
 
Join Date: Oct 2010
Location: Canada
Posts: 4
Default

stairwell opening in wood joist floors


peak of roof is marked with a pink dashed line (left to right on drawing)
Attached Files
File Type: doc future attic stairwell.doc (52.5 KB, 70 views)
Galatea is offline   Reply With Quote
Old 10-13-2010, 01:37 PM   #9
STAFF
 
BigJim's Avatar
 
Join Date: Sep 2008
Location: East Tennessee
Posts: 7,205
Blog Entries: 1
Default

stairwell opening in wood joist floors


Quote:
Originally Posted by Galatea View Post
the walls beaneath (living room on main floor) are drawn in pink and . The roof pitch is 9:12. We are installing a pre-fabricated 48" spiral staircase. The celing height where the new stairs would exit onto the attic floor is 8'-0"
As for head room you will be fine as you will have a minimum of 81 inches on the low side of your stairs. I would still be concerned with the spacing of your joists though. Another couple of things is you will be limited with the size of objects you will be able to get upstairs as the spiral stairs will be narrow. In this area we have to have another set of stairs as that is code. I really don't know how that is up your way but for sure a fire escape is a necessity. I would recommend talking to your code enforcement to be on the right side with them about the joist, extra stairs and fire escape.

__________________
New members: Please consider adding your location to your profile.

Jim
BigJim is offline   Reply With Quote
Reply

Tags
floor, joists, opening, stairwell


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Old Wood Floors scook5439 Flooring 1 09-04-2010 11:13 AM
Easy way to reseal (?) wood floors? boinsie Flooring 3 04-26-2010 07:52 AM
Unfinished step around wood laminate floors markq Flooring 7 07-17-2009 07:19 PM
Pet damaged wood floors.. paint them?! awoods Painting 3 03-05-2009 05:56 PM
Furniture on wood floors antonyg Interior Decorating 2 11-28-2008 10:28 AM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.