Exterior sheathing

[stigedis]

Starting to frame next week. Will be 2x6 on 6" curb. Question is on exterior osb...How far down does the sheathing extend? To foundation/sill plate or does it go beyond the interface....
Another way to look at it is...does the sill plate goto the edge of the foundation wall or do you hold it back the thickness of sheathing so that when sheathing is installed it is flush with foundation wall? Seems that sill should be flush with wall so that sheathing extends slightly past so that water sheds past where sill sit of wall....

 

[kd3pc]

I do mine like this....

the sill plate is flush with the outside of the pour/foundation. The OSB comes down past that plate and overlaps the pour/foundation/rat metal by at least an inch. This clinches the joint so few rodents can get through and weather stays where it should. Then wrap the whole deal with Tyvek or your choice of stuff. ON the inside of the sill plate I caulk or seal that joint as well.

Best of luck, others will post I am sure.

 

[G McKay]

I used metal. I'll never have to replace it or paint it. Where you live and when the snow piles up around the bottom- it will rot in no time and you'll be replacing it.
But, I let mine go below the top of the foundation about an inch or so. Like you said, that way it will shed the water. But OSB will not last. It will be coming apart in a few years. It is only sawdust that has been glued together. I would at least try to find some type of legitimate outdoor siding. Animals like raccoons will tear right through that OSB stuff.

 

[lonestarky]

You definitely want the sill flush with the foundation, so the sheathing is incremental to the foundation and walls. Putting them back and resting the osb on the sill guarantees leaks and rot. You may want to check local codes or spy on other homes built in the area, as they'll be a good guideline. In MN, I would say you want to at least 1" past the sill plate, however 4-6" above grade if possible.

I would assume OSB isn't the finished exterior surface, and there will be vinyl siding or something on top of it? If the osb is your intended exterior surface, I would recommend a T11 or something like that instead. GMcKay is right, OSB is just laminated strands, and will fall apart when subjected to any moisture more than the rated amount.

 

[Kevin54]

Same here.....1" below the top of the block, or 1" below the bottom of the plate. You want to make sure you are square and level. Then if you put on vinyl siding, your starter strip will hook on the lip of the OSB.

 

[hippie2cams]

I think I have said it before OSB is cheap, ugly, rotten, hard to paint, and did I mention its **** ugly

 

[stigedis]

Thanks guys. I appreciate the input. Yes vinyl siding to match house will be utilized.... Stay tuned for pictures and thread of build.....if I can figure how to post pics.....