DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > Framing and Foundation > two small floor joist




Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old 02-29-2012, 04:10 PM  
rowdy48
Junior Member
 
Join Date: Jul 2008
Posts: 17
Liked 1 Times on 1 Posts

Default two small floor joist

I have a 1200 sq foot ranch with a full basement built in 1957. The floor joist are 2 x 8 dimensional lumber and they span 12 ' 8". In the center of the house about six in a roll have had failures. One because the plumbers cut
a 4 inch square hole to run the tub drain. The joist beside this one was cut in half so the hvac guys could run the furnace vent to the roof thru the bath closet. The remaining four joist have failed due to large knots in the lumber that have cracked. Some time in the past someone added some angle iron to repair these joist but it was poorly fastened. Today I removed the angle iron and plan to saddle new 2x8's beside the damaged ones. Anyone have a suggestion as to the the type of fasteners (nails, screws or bolts) and how many to mate the old and new together ? Clearance is minimum in some areas. As luck would have it all these joist are over my electric panel and
water heater and I have had to pull the wiring and plumbing for access.
I'm considering 3 inch nails paired or tripled every 16 inches.

Stuart



__________________
rowdy48 is offline  
 
Reply With Quote Quick reply to this message
Old 02-29-2012, 04:44 PM  
nealtw
Contractor
 
Join Date: Nov 2010
Location: vancouver, b.c.
Posts: 10,257
Liked 844 Times on 754 Posts
Likes Given: 1461

Default

Three 3" nails every 16" is good. Wedge the old ones up a little with a couple 2x4s to the floor before nailing. You can drill a 2 1/2"
hole in the center for the plumbing without loosing strength, if you can't just lower it. The one cut out for vent pipe should be hangered from a piece that is hangered off the two full length joists. I would also use a couple tubes of flooring glue, glue between old and new and between new and floor boards.

__________________
nealtw is offline  
 
Reply With Quote Quick reply to this message
Old 02-29-2012, 05:11 PM  
rowdy48
Junior Member
 
Join Date: Jul 2008
Posts: 17
Liked 1 Times on 1 Posts

Default

The glue is a great idea. I plan on using a couple of jacks to ease the joists back level or as far as I can without additional damage. The plumbing will be dropped below the joist. I'm waiting on my hvac guy but since I'm replacing the furnace I'm thinking go with a high efficency and eliminate the vent to the roof. This will allow me to continue the cut joist to the center support beam. I have an issue with a vent run if I hang the cut joist off the ones beside it. I've had a support pole under it since I bought the house in 93. I'm adding a bath downstairs so I'm increasing the size of water heater and will use an electric to get rid of the vent. The payback for a tankless would take two long since I'm bugging out for a warmer climate soon.

Thanks for the response

__________________
rowdy48 is offline  
 
Reply With Quote Quick reply to this message
Reply


Quick Reply
Message:
Options

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 On
Refbacks are On


Similar Threads
Thread Thread Starter DIY Home Repair Forum Replies Last Post
floor joist question JeremyB Framing and Foundation 11 01-28-2012 02:44 PM
Floor Joist Framing dw8 Framing and Foundation 9 10-25-2011 05:51 PM
Cutting Floor Joist in Timber Frame jhhaley Framing and Foundation 3 08-04-2011 06:50 PM
Question on floor joist Alonzo Flooring 3 09-13-2010 07:59 PM
Small Floor-jacking Project jpalumbos Framing and Foundation 8 10-15-2006 08:54 AM