DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > Framing and Foundation > reinforcing second floor joists




Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old 05-20-2010, 03:05 PM  
nikademous
Junior Member
 
Join Date: May 2010
Posts: 1
Default reinforcing second floor joists

my house is 31 ft x 24 ft one story. i would like to take off old roof and put a second floor on. the building inspector says that the exisiting joists
2x5's 16" on center my not be enough support. i need to know if i can sister more 2x5 next to the exisiting ones. the joist run from side to side spaning 24 ft. will sistering joists support 30 pds per inch? i plan on reinforcing everything with beams running vertical to joists.



__________________
nikademous is offline  
 
Reply With Quote Quick reply to this message
Old 06-11-2010, 02:47 PM  
jklingel
Junior Member
 
Join Date: May 2010
Location: Fairbanks, AK
Posts: 4
Default tough one

Extremely tough for anyone to answer w/out all the specs on the house. You better see a qualified engineer, because you may well need to HAVE INSTALLED LONG AGO a foundation wall under whatever is going to support those beams you are adding in. If I read correctly, you are taking a clear span and now halving it by supporting the ceiling members w/ beams; excellent idea for them, but what will the beams sit on? Sistering is fine, but it only doubles the load carrying capacity of the member; you may need to add height, as in trusses, to keep the clean span. I see big red flags. GL. j

__________________
jklingel is offline  
 
Reply With Quote Quick reply to this message
Old 06-11-2010, 02:55 PM  
jklingel
Junior Member
 
Join Date: May 2010
Location: Fairbanks, AK
Posts: 4
Default Ps:

What you described implies a flat roof. Are you sure you don't have normal trusses and you are just looking at the bottom cord? That is an unbelievable span for a 2x5 (did you mean 2x6?), or even a 2x12.

__________________
jklingel 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
not enough floor joists shedee Framing and Foundation 2 08-16-2013 04:32 PM
Advice needed for reinforcing floor for large Aquarium tempest Framing and Foundation 4 05-25-2009 12:40 AM
Floor reinforcing for Aquarium Nuuze Framing and Foundation 7 04-17-2008 10:52 AM
Odd stuff on floor joists WestBentley Framing and Foundation 3 02-25-2007 12:00 PM
Floor Joists in Attic cibula11 Flooring 27 01-11-2007 12:57 PM