Forums | Home Repair | Home Improvement | Painting | Interior Decorating | Remodeling | Landscaping


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 04-18-2010, 03:21 PM   #1
Newbie
 
Join Date: Dec 2009
Location: Denver, CO
Posts: 13
Share |
Default

Attached Patio Overhead Roof


I am installing a 9' high patio roof on a 5 1/4" slab. The roof will be attached to a house wall. The area is 10 1/2' along the house wall and if I put a shed roof on a ledger the span is 9' from the ledger to the 4"x4" posts. I will use a 2" x 6" ledger. The roof will have about nine 2"x4" rafters on 12" centers and 3/4" OSB sheeting plus the weight of a layer of asphalt 3-tab shingles.

How many 4"x4" posts do I need to support this span?

Also, if I decide to make an attached gable roof instead would I need the same number of 4"x4" support posts.
Gandalf is offline   Reply With Quote
Old 04-18-2010, 03:28 PM   #2
Member
 
Join Date: Mar 2007
Location: Long Island, NY
Posts: 9,519
Default

Attached Patio Overhead Roof


The structure you describe is inadequate for the job, even in a southern region. The 2x4 rafters are inadequate. for one. It would help if you posted where you live.

Ron
Ron6519 is offline   Reply With Quote
Old 04-18-2010, 05:00 PM   #3
Newbie
 
Join Date: Dec 2009
Location: Denver, CO
Posts: 13
Default

Attached Patio Overhead Roof


In Denver Colorado. Why inadequate? The IRC codes say that with a 30 psf ground snow load that 2"x4" rafters on 12" centers can span 9'5".

Last edited by Gandalf; 04-18-2010 at 05:04 PM.
Gandalf is offline   Reply With Quote
Old 04-18-2010, 06:00 PM   #4
Member
 
Join Date: Jan 2009
Location: South of Boston, MA
Posts: 17,248
Default

Attached Patio Overhead Roof


What type/grade of wood are you using to get the 9' 5" span ?
Scuba_Dave is offline   Reply With Quote
Old 04-18-2010, 10:53 PM   #5
Registered User
 
Join Date: Mar 2009
Posts: 9,870
Default

Attached Patio Overhead Roof


You may want to give a call to your local Building Department.... My 2003 IRC says 2x4, 12"o.c., Douglass fir, will span 9'10" with NO SNOW load.

Be safe, Gary
__________________
Clothes taking longer to dry?
Clean the dryer screen in HOT water if using fabric softener sheets.
They leave a residue that impedes air-flow, costing you money.
Clean the ducting in the last six months? 17,000 dryer fires annually!
Gary in WA is online now   Reply With Quote
Old 04-19-2010, 10:30 AM   #6
Newbie
 
Join Date: Dec 2009
Location: Denver, CO
Posts: 13
Default

Attached Patio Overhead Roof


Quote:
Originally Posted by Scuba_Dave View Post
What type/grade of wood are you using to get the 9' 5" span ?

It is the douglas fir they sell at home depot.
Gandalf is offline   Reply With Quote
Old 04-19-2010, 10:54 AM   #7
Member
 
Join Date: Jan 2009
Location: South of Boston, MA
Posts: 17,248
Default

Attached Patio Overhead Roof


I'm getting only 7' 6" for span w/30psf snow load
2x6 will get you 10'+ easily with 16" OC
Scuba_Dave is offline   Reply With Quote
Old 04-19-2010, 11:43 AM   #8
Newbie
 
Join Date: Dec 2009
Location: Denver, CO
Posts: 13
Default

Attached Patio Overhead Roof


Thanks Dave. So that's about 9 ten foot 2 x 6 boards. How many 4" x 4" support posts do you think I should use?
Gandalf is offline   Reply With Quote
Old 04-19-2010, 11:53 AM   #9
Member
 
Join Date: Jan 2009
Location: South of Boston, MA
Posts: 17,248
Default

Attached Patio Overhead Roof


You are coming out ~9' 5" from the house ?
For 2x6 rafters use a 2x8 ledger & hangers for better support
If your roof will be 10' 6" along the house you really only need (2) posts at the outside corners
Instead of 4x4's go to 6x6's or 4x6 at the very least
Cut & notch the top & run a beam between the 2 posts to support the rafters
What kind of slope will you have on this roof ?
Low slope I'd probably go to 2x8 rafters for that one heavy snow storm

Since this will be attached to the house you are supposed to dig down & pour piers for the posts to sit on - down below frost depth for your area

Pics might help to see what you are dealing with
Scuba_Dave is offline   Reply With Quote
The Following User Says Thank You to Scuba_Dave For This Useful Post:
Gandalf (04-20-2010)
Reply


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
Need opinion on this roof profenx Roofing/Siding 14 10-12-2010 12:56 AM
Replace the roof or not??? Leaked only once when it snowed chasqui Roofing/Siding 10 04-13-2010 10:02 PM
Putting a new flat roof on a 3600 sf home Jean3 Off Topic 2 04-09-2010 12:35 AM
Patio Roof Issue: Water or Paint Wearing Off? kirridam Roofing/Siding 6 10-22-2009 05:31 AM
Patio Roof Renovation freddie Roofing/Siding 4 11-01-2006 09:01 PM




Top of Page | View New Posts

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