Roofing- Can 1/2 OSB be used as roof sheeting.?

Answer 1

Where do people come up with this . . .

1/2" OSB is generally rated for up to 32" spacing with a 70 PSF (pounds per square foot) load. I don't know what the snow load design factors are for northern Canada, but anywhere in the US is well under the 70 PSF. Alaska may or may not be an exception. What this means is 1/2" OSB is acceptable as long as your rafters or trusses are 32" or less on center.

Thicker OSB has a wider span rating, but using thicker panels on a roof designed for 1/2" can cause other problems. Thicker panels add more dead weight to the structure. If the roof system is not designed for the extra weight, you can end up with cracked ceilings or joints where the walls meet. Will not fall down and go boom, but why use more than you need. 5/8" probably would not be an issue, but I certainly would not go over that unless it is called for.

Now for the metal clips (H-clips). You do need H clips, but not for support. The clips have dimples where the edge of the sheets meet to make a gap between sheets. The gap is important because it allows the sheets to expand and contract as the temperature changes. Without them, the roof may buckle because the sheets can expand and push on adjacent panels, not because of a lack of support.

Finally, 3/4" for wall sheathing (the skin)?? Maybe if you are building an elephant house. That's about what it would take to cause a problem with 7/16" on your walls.

Answer 2

Used Roofing Sheets

Answer 3

It can be, but you should go with 3/4" OSB for your skin instead of half-inch.

Answer 4

depending on the area ( snow load) it should be 3/4" to carry load and servicablity.

Answer 5

yes, as long it sits on your rafters,and use the medal clipis in between 4 xtra suppport