Author Topic: NE Oregon 20 x 30+ 1.5 story  (Read 26034 times)

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Offline CabinNick

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Re: NE Oregon 20 x 30+ 1.5 story
« Reply #100 on: October 10, 2018, 08:09:21 PM »
We excavated for our foundation today; contractor should form and pour later this week.  Exciting to finally be breaking ground for the cabin!!  I was not sure if we were going to get this done before winter hit. 


I also mostly finished the exterior of the outhouse/shed.  The outhouse will just be for the next year or two until we get water hooked up and for in the winter when we don't want to turn the water on for short trips.  I took a 24" water pipe, cut perforations in the bottom 5 feet, and buried it vertically about 12'.  I cut the pipe off about an inch below the toilet seat.  Building the outhouse was my trial run for the cabin build - to make sure we liked the color/style of roofing and siding and learn how to do the window, door, metal roof, etc.  Made a handful of mistakes but glad they were made on the outhouse instead of the cabin!


Offline CabinNick

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Re: NE Oregon 20 x 30+ 1.5 story
« Reply #101 on: October 13, 2018, 05:19:09 AM »
Poured our footings yesterday.  Stem wall will be formed and poured early next week.  I contracted the foundation work.  One note incase anyone ever compares this pictures to our floor plans....the two forms for the isolated piers are in the wrong location in these pictures.....oops!

Question:  Our loads will be almost entirely supported by the outside walls.  As you can see in the picture, there are three places where we will have load bearing posts supported by concrete piers inside the crawl space.  I was planning on doing dimensions similar to the footings - 16x16" and 8" deep.  Should I be making these deeper than 8"?


Offline ChugiakTinkerer

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Re: NE Oregon 20 x 30+ 1.5 story
« Reply #102 on: October 13, 2018, 06:34:33 AM »
The IRC doesn't differentiate interior and exterior footings for a crawlspace foundation, so you should be good with the same dimensions as your exterior pour.

https://codes.iccsafe.org/content/IRC2015/chapter-4-foundations

What's the load bearing value of your soil?
My cabin build thread: Alaskan remote 16x28 1.5 story

Offline Don_P

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Re: NE Oregon 20 x 30+ 1.5 story
« Reply #103 on: October 13, 2018, 12:48:09 PM »
As CT was alluding to, the minimum size of the footing is load/ soil bearing capacity. The distance from the post or pier to the edge of the footing should not be greater than the footing thickness.

Offline CabinNick

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Re: NE Oregon 20 x 30+ 1.5 story
« Reply #104 on: October 16, 2018, 05:05:55 PM »
Soil bearing capacity is 3,000 psf.  I decided to just wait and pour the pier next summer when I start the build.  I think I will play it safe and just make them a little larger than my exterior footings. 

Pulled the forms on the stem wall today.  Foundation turned out great.  I was really nervous that we were not going to get this done before weather hit but now we have 65 degree highs in the forecast for the next 10 days.  We are going to let the concrete cure for at least 7 days and then backfill. 



Offline MountainDon

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Re: NE Oregon 20 x 30+ 1.5 story
« Reply #105 on: October 17, 2018, 04:43:06 AM »
 [cool]
Just because something has been done and has not failed, doesn’t mean it is good design.

Offline Don_P

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Re: NE Oregon 20 x 30+ 1.5 story
« Reply #106 on: October 17, 2018, 02:15:26 PM »
Looking good  :)
Depending on soils and freeze it might be worth stacking straw inside over the footings.

Offline CabinNick

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Re: NE Oregon 20 x 30+ 1.5 story
« Reply #107 on: October 17, 2018, 04:04:38 PM »
Don - so the idea would be to pile straw on top of the footings to insulate the soil under them so it would not freeze and uplift?  Our soils are well drained and most of the foundation is sitting on fractured rock (mid-sized excavator could not get through it).  I wasn't planning on doing anything but maybe straw would be cheap insurance. 

Offline SouthernTier

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Re: NE Oregon 20 x 30+ 1.5 story
« Reply #108 on: October 18, 2018, 05:01:15 AM »
I put my foundation about this time last year with actual work to start in spring.  I was worried about freezing (soils are not that well draining at my location).  I had the walls and the floor on, so I ended up buying the fiberglass batts I will be using in the walls ahead of time, and laid them on the (cement) floor.  I don't know if it helped or not but I didn't get any freeze cracks.  We had a couple of weeks with temps in the single digits, so I was glad I didn't take any chances.  I put an indoor/outdoor thermometer in the basement, with the "outdoor" sensor under the batts.  It typically was 5 to 8 degrees warmer under the batts than above.

Offline CabinNick

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Re: NE Oregon 20 x 30+ 1.5 story
« Reply #109 on: November 29, 2018, 06:05:47 PM »
The property is covered in snow now.....time to switch from working on the ground to doing computer/paperwork to get ready for next summer's build. 

After talking with the Building Department, I decided to platform frame instead of balloon frame.  I will have 2x6 spaced 16" OC for my walls.  The second floor will be supported on 6x12 Douglas Fir exposed beams spaced 48" OC.  I have seen folks on this site do exposed beams a couple of different ways.  Can someone help me understand what I need to do in the space between the 48" spaced beams to transfer the load from the 2nd story walls to the first.  There will be a 2x12" rim joist, but what else do I need?  Do I add another 2x12 parallel between the beams or do I just add 12" tall vertical 2x6" under each of the studs?

Made a quick figure to show what I am talking about. 

Offline Don_P

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Re: NE Oregon 20 x 30+ 1.5 story
« Reply #110 on: November 30, 2018, 06:10:30 PM »
When I've done that the rim was also heavy timber, notched for the joists, the rim generally about an inch or two thicker than the frame wall to provide a step over the wall finish. It takes care of finishing out that area between joists. I'm not sure that I see any structural problems with what you have drawn but I think it will be a headache at finish and trim time. The floor typically goes on top of the joists before the second floor walls are framed but I have done what you drew to keep it out of the weather, think about the floor to gable end detail if you go that route though.

Offline azgreg

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Re: NE Oregon 20 x 30+ 1.5 story
« Reply #111 on: December 01, 2018, 07:01:11 AM »
Hey Don, can he run cripple studs between the beams in line with the studs?

Offline Don_P

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Re: NE Oregon 20 x 30+ 1.5 story
« Reply #112 on: December 01, 2018, 06:23:00 PM »
Sure. I've also just framed pockets for beams to drop into, then the top plate/sole plate for the floor above would run across the beam tops, no rim. This is a different situation but shows the idea sort of. There were a couple of spaced 2x6's to form posts under there then a stud ran up each side of the beams and were secured to the beams. I just have a single jack in at the time of that pic underneath the truss that's in place, then there was a spacer and the second jack to fill out the stud depth.

Offline CabinNick

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Re: NE Oregon 20 x 30+ 1.5 story
« Reply #113 on: December 04, 2018, 10:00:29 AM »
Thanks for the info.  I am leaning toward just using small cripple studs to transfer the load but have all winter to mull it over some more.
 

 

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