Framing Walls On A Sloped Slab

 
Thread Tools Search this Thread Display Modes
Old 07-26-2017, 12:15 PM   #1
Registered User
 
Syner's Avatar
 
Trade: VS Woods
Join Date: Jul 2017
Location: Alberta
Posts: 6
Rewards Points: 24

Framing Walls On A Sloped Slab


Typical detached garage slabs are poured with 2-4" of slope in my area. Some have curbs, most don't.

I've seen a lot of framing methods addressing the slope (I have my preferred approach) and was curious what you all do.

Method I use:

I've found the most accurate and time- (re: cost-) effective method for myself is measuring with a surveyor's level every 12", drawing the slope in CAD, then printing out a numbered cut list for my helper (I am marking plates while my helper cuts).

Some of the other methods I've seen:

- Completely ignore the slope. Frame a square wall and let the garage lean into the alley. - The individual doing this in my area undercuts everybody by ~75%

- Cut a full length shim out of 6x PT material (essentially creating a level curb) - I've only seen one guy do this. I like that you don't have to cut individual studs, and it raises untreated material even further from grade. I don't like needing 6"+ anchors on the more extreme slopes.

Methods I've read:

- Erect: Stand the ends and mark the tall side with a string level. Toe-nail studs, snap a chalk line, and cut each in the air.

- On the ground: Measure the overall slope and cut the tall stud accordingly. Lay interior studs, snap a line, and cut each. (Very similar to my approach, minus a pre-calculated cut list).

So, what's your preferred approach?

Last edited by Syner; 07-26-2017 at 01:09 PM.
Syner is offline  

Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. ContractorTalk.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!

   

Advertisement

 

Old 07-26-2017, 12:20 PM   #2
Eater of sins.
 
ScipioAfricanus's Avatar
 
Trade: Designer/Drafter Extraordinaire
Join Date: Sep 2008
Location: Orange County, CA.
Posts: 3,599
Rewards Points: 802

Re: Framing Walls On A Sloped Slab


I had always used the fourth method you mentioned. On the ground.

Andy.

Advertisement

ScipioAfricanus is online now  
Old 07-26-2017, 12:42 PM   #3
Shingler extraordinaire
 
A&E Exteriors's Avatar
 
Trade: Roofing, Framing, siding, decks
Join Date: Aug 2009
Location: Grand Rapids, Michigan
Posts: 6,995
Rewards Points: 9,832

Re: Framing Walls On A Sloped Slab


Your precalculated cut list is pretty cool. I've ran a string at corner height, then measured to the string , and then framed my wall.
A&E Exteriors is online now  
   
 
Old 07-26-2017, 09:13 PM   #4
always building
 
parkers5150's Avatar
 
Trade: general constructiion
Join Date: Dec 2008
Location: North County San Diego Fallbrook CA
Posts: 1,533
Rewards Points: 1,580

Re: Framing Walls On A Sloped Slab


you're basically framing an upside down rake wall...calc or snap n cut... whatever makes you more comfortable
__________________
"Building trust one job at a time."
www.RDPontheWeb.com
San Diego Contractor Deck and Patio Cover Builder
parkers5150 is online now  
The Following 2 Users Say Thank You to parkers5150 For This Useful Post:
Californiadecks (07-26-2017), Rio (07-27-2017)
Old 07-26-2017, 09:53 PM   #5
Sure, I can do that...
 
jlhaslip's Avatar
 
Trade: carpentry/renovations
Join Date: Dec 2009
Location: Edmonton, Alberta, Canada
Posts: 1,655
Rewards Points: 90
Send a message via Skype™ to jlhaslip

Re: Framing Walls On A Sloped Slab


I pour the slab flat around the perimeter and slope the floor from about a foot inside the walls.
Doing so avoids this issue completely.
jlhaslip is online now  
The Following 10 Users Say Thank You to jlhaslip For This Useful Post:
A&E Exteriors (07-26-2017), Californiadecks (07-26-2017), Dirtywhiteboy (07-27-2017), hdavis (07-27-2017), J.C. (08-10-2017), mrdavid567 (11-11-2017), Rio (07-27-2017), ScipioAfricanus (07-27-2017), Syner (07-26-2017), Workingmanvan (07-30-2017)
Old 07-26-2017, 10:07 PM   #6
Registered User
 
Syner's Avatar
 
Trade: VS Woods
Join Date: Jul 2017
Location: Alberta
Posts: 6
Rewards Points: 24

Re: Framing Walls On A Sloped Slab


Quote:
Originally Posted by jlhaslip View Post
I pour the slab flat around the perimeter and slope the floor from about a foot inside the walls.
Doing so avoids this issue completely.
I wish I had that luxury. Unfortunately, the vast majority of garages I build are on pads poured by cookie-cutter home builders. They will pour level perimeters for a cost - but most homeowners don't understand the point/benefits of it.
Syner is offline  
Old 07-26-2017, 10:44 PM   #7
GC/carpenter
 
Californiadecks's Avatar
 
Trade: Decking, Railing, Carpenter/General Contractor
Join Date: Nov 2011
Location: Anaheim Hills, California (OC)
Posts: 30,605
Rewards Points: 618

Re: Framing Walls On A Sloped Slab


Quote:
Originally Posted by Syner View Post
I wish I had that luxury. Unfortunately, the vast majority of garages I build are on pads poured by cookie-cutter home builders. They will pour level perimeters for a cost - but most homeowners don't understand the point/benefits of it.


That's why you explain to the home owner that it's more expensive to not pour the slab with level perimeters due to fact that it's easier to form than frame. A little home owner education goes a long way in this business. Communication is key!


Mike.
_______________
Californiadecks is online now  
The Following 4 Users Say Thank You to Californiadecks For This Useful Post:
NJGC (11-10-2017), overanalyze (07-27-2017), Rio (07-27-2017), ScipioAfricanus (07-27-2017)
Old 07-26-2017, 11:58 PM   #8
Registered User
 
Syner's Avatar
 
Trade: VS Woods
Join Date: Jul 2017
Location: Alberta
Posts: 6
Rewards Points: 24

Re: Framing Walls On A Sloped Slab


Quote:
Originally Posted by Californiadecks View Post
That's why you explain to the home owner that it's more expensive to not pour the slab with level perimeters due to fact that it's easier to form than frame. A little home owner education goes a long way in this business. Communication is key!


Mike.
_______________
I couldn't agree more.

Unfortunately by the time most homeowners contact me, they've signed off with their home builders and hefty penalties accompany any alterations.
Syner is offline  
The Following User Says Thank You to Syner For This Useful Post:
hammer7896 (07-27-2017)
Old 07-27-2017, 12:42 AM   #9
GC/carpenter
 
Californiadecks's Avatar
 
Trade: Decking, Railing, Carpenter/General Contractor
Join Date: Nov 2011
Location: Anaheim Hills, California (OC)
Posts: 30,605
Rewards Points: 618

Re: Framing Walls On A Sloped Slab


This is one reason I NEVER enter into sub contracts. I'll only take prime contracts. I need to be the keeper of the gold.


Mike.
_______________
Californiadecks is online now  
The Following 2 Users Say Thank You to Californiadecks For This Useful Post:
decksterdecks (08-15-2017), NJGC (11-10-2017)
Old 07-27-2017, 12:07 PM   #10
Pro
 
hdavis's Avatar
 
Trade: remodeling
Join Date: Feb 2012
Location: CoastalME
Posts: 18,422
Rewards Points: 1,715

Re: Framing Walls On A Sloped Slab


Simple slope, I measure the drop and gang cut the studs, after first "squaring up" one end to account for the drop, and then cut the other end square. No miter saw, just a circ saw. Nail together and stand it up.

How the wall gets attached to the slab can make a big difference in cost.
hdavis is online now  
Old 07-27-2017, 12:13 PM   #11
Pro
 
hdavis's Avatar
 
Trade: remodeling
Join Date: Feb 2012
Location: CoastalME
Posts: 18,422
Rewards Points: 1,715

Re: Framing Walls On A Sloped Slab


If you're marking each stud and then cutting, string a chalk line between the corners at the right height, then take each stud, set it each in place, mark with the chalk line, then cut them all and toe nail.

Working alone, this is easiest and fastest to cut on the ground, IMO
hdavis is online now  
Old 07-29-2017, 01:07 AM   #12
Pro
 
Workingmanvan's Avatar
 
Trade: Carpenter-Renovations/Repairs
Join Date: Feb 2017
Location: Vancouver BC
Posts: 108
Rewards Points: 256

Re: Framing Walls On A Sloped Slab


If it was my own place I would build a curb and put the walls on that. Other than that, my first thought would be to rip shims for under the plates, depending on how severe the slope was.
Workingmanvan is offline  
Old 08-07-2017, 08:35 PM   #13
Pro
 
Timuhler's Avatar
 
Trade: Framer
Join Date: Mar 2006
Location: Port Orchard, WA
Posts: 1,061
Rewards Points: 746

Re: Framing Walls On A Sloped Slab


The method we use is to shoot control points at all corners, cut the studs for those corners so that the tops of them are exactly the same level.

Then run a chalk line from top to top, mark each stud to the line and cut. Perfectly level, very fast, and dead on accurate.

The pictures are from 2007, man I've aged!



Timuhler is offline  
The Following 4 Users Say Thank You to Timuhler For This Useful Post:
A&E Exteriors (08-07-2017), ACEVEDO (11-13-2017), hdavis (08-07-2017), Syner (08-10-2017)
Old 08-07-2017, 10:28 PM   #14
Pro
 
hdavis's Avatar
 
Trade: remodeling
Join Date: Feb 2012
Location: CoastalME
Posts: 18,422
Rewards Points: 1,715

Re: Framing Walls On A Sloped Slab


Quote:
Originally Posted by Timuhler View Post
The method we use is to shoot control points at all corners, cut the studs for those corners so that the tops of them are exactly the same level.

Then run a chalk line from top to top, mark each stud to the line and cut. Perfectly level, very fast, and dead on accurate.

The pictures are from 2007, man I've aged!



So you mark them in place, then cut on the floor? Gang cut?
hdavis is online now  
Old 08-07-2017, 10:32 PM   #15
Pro
 
Timuhler's Avatar
 
Trade: Framer
Join Date: Mar 2006
Location: Port Orchard, WA
Posts: 1,061
Rewards Points: 746

Re: Framing Walls On A Sloped Slab


Quote:
Originally Posted by hdavis View Post
So you mark them in place, then cut on the floor? Gang cut?
Nope we just cut them, nail the plates on and lift the wall
Timuhler is offline  
The Following User Says Thank You to Timuhler For This Useful Post:
hdavis (08-07-2017)
Old 08-10-2017, 12:35 AM   #16
Registered User
 
Syner's Avatar
 
Trade: VS Woods
Join Date: Jul 2017
Location: Alberta
Posts: 6
Rewards Points: 24

Re: Framing Walls On A Sloped Slab


Quote:
Originally Posted by Timuhler View Post
Nope we just cut them, nail the plates on and lift the wall
So if I understand correctly, you lay your bottom plate and brace the ends, mark and cut each stud, then build the wall on the floor? Or are you toe-nailing each stud?
Syner is offline  
Old 08-10-2017, 12:38 AM   #17
GC/carpenter
 
Californiadecks's Avatar
 
Trade: Decking, Railing, Carpenter/General Contractor
Join Date: Nov 2011
Location: Anaheim Hills, California (OC)
Posts: 30,605
Rewards Points: 618

Re: Framing Walls On A Sloped Slab


Quote:
Originally Posted by Syner View Post
So if I understand correctly, you lay your bottom plate and brace the ends, mark and cut each stud, then build the wall on the floor? Or are you toe-nailing each stud?


The chalk line applies the mark in the air. I like it!


Mike.
_______________
Californiadecks is online now  
Old 08-10-2017, 09:30 AM   #18
Pro
 
hdavis's Avatar
 
Trade: remodeling
Join Date: Feb 2012
Location: CoastalME
Posts: 18,422
Rewards Points: 1,715

Re: Framing Walls On A Sloped Slab


Quote:
Originally Posted by Syner View Post
So if I understand correctly, you lay your bottom plate and brace the ends, mark and cut each stud, then build the wall on the floor? Or are you toe-nailing each stud?
Doing it that way, you don't toe nail.

A few months ago I watched a guy toe nail them all in standing up and then put the top plate on in place. Not my idea of a good time.
hdavis is online now  
Old 08-10-2017, 01:07 PM   #19
Registered User
 
Syner's Avatar
 
Trade: VS Woods
Join Date: Jul 2017
Location: Alberta
Posts: 6
Rewards Points: 24

Re: Framing Walls On A Sloped Slab


Quote:
Originally Posted by hdavis View Post
Doing it that way, you don't toe nail.

A few months ago I watched a guy toe nail them all in standing up and then put the top plate on in place. Not my idea of a good time.
That's exactly what I was thinking.

Based on the replies in this thread, it seems like marking with chalk is a favorite. Maybe I'll forego my pre-calc'd cut list on the next sloped pad - at least it'll save an extra trip to a site.
Syner is offline  
Old 08-10-2017, 01:23 PM   #20
Pro
 
J.C.'s Avatar
 
Trade: Cabinet Maker
Join Date: Sep 2009
Posts: 1,288
Rewards Points: 1,482

Re: Framing Walls On A Sloped Slab


I've never had to do it but, I think I'd probably use a laser level to calculate the slope and construction master to tell me the stud lengths.

Advertisement

__________________
I do not prize the word "cheap." It is not a badge of honor...it is a symbol of despair. Cheap prices make for cheap goods; cheap goods make for cheap men; and cheap men make for a cheap country. ~ William McKinley
J.C. is offline  
The Following User Says Thank You to J.C. For This Useful Post:
Stilla (11-11-2017)

Tags
frame , slab , slope , wall


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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
Framing Layout and Blueprint Reading - Seeking Advice and Tips for Beginners Workin Kid Framing 49 02-27-2013 12:54 PM
Walls before slab VAviaCo Framing 14 07-15-2012 10:23 PM
Framing Documents To Die For NC2X4 Framing 33 09-17-2010 11:45 AM
24" on center framing on exterior walls lunapark Framing 9 09-13-2009 11:53 AM
here's a painting price list...... Jer44 General Discussion 9 02-17-2009 08:30 AM

Join Now... It's Fast and FREE!

I am a professional contractor
I am a DIY Homeowner
Drywall Talk is for
PROFESSIONAL CONTRACTORS ONLY!

At DrywallTalk.com we cater exlusivly to professional contractors who make their living as a contractor. Knowing that many homeowners and DIYers are looking for a community to call home, we've created www.DIYChatroom.com DIY Chatroom is full of helpful advices and perfect for DIY homeowners.

Redirecing in 10 seconds
No Thanks
terms of service

Already Have an Account?