OSB

[madjack]

WE, if you glue the strip over the samitch and use a urethane construction adhesive, it will fill any gaps in that "ragged" edge and hold quite well...pre-drill any screw holes and add a shot of wood glue in the hole and you should have no problems with the screws holding/splitting the wood...whether you laminate the strip on top or not......
madjack

[Miriam C.]

Miriam I understand what your saying but I don't think you understand my concern wil gluing to the endgrain of the OSB. Think about how rough OSB is on the ends. It is so jagged I would be concerned with the strength of the glue joint between it and a piece of 1/4 stock.

Picture this: your OSB is glued to the 1/4 inside and 1/4 outside skins. The laminated frame is glued to both the sides and the OSB edge. Which is why I suggested you make it thicker. Your spars and floor attachment will keep your sides upright and square if you keep an eye on it.

From the point that the laminate and skins are glued they become one unit. (a box) If you glue the ceiling to the top, the laminate, OSB and inside skin are means of support for the spars and blocking only. They do not effect the roof at all. Technically for this reason you may not even need the laminate. The blocking will hold the ceiling down and the roof up. You can put screws in from the outside if needed.
The only real question: Is the OSB strong and rigid enough with 1/4" siding...

[War Eagle]

Madjack, Miriam, good points. I'll do some testing. Like I said I have a sheet of OSB and will cut my profile from that and then cut it down to use the frame. I'll do some testing and take some pics to show how it stands up to stress. Next week.

[GPW]

Warr... use watcha' got .... try it out .... we used alot of the new OSB in home construction and it was teriffic ,and plenty strong for a core type application , especially when skinned with thin ply ... and our weather testing proved it was pretty durable ...