Replacing old door is OSB accecptable for building up the rough opening??

[papason]

Taking out the old exterior door leaves a pretty wide rough opening. A special order door is too much and takes too long to get. so the plan is to build up the opening by adding some wood. I don.t have plywood but I do have some OSB. Will it work.?

 

[He who knows]

Is this as a permanent solution?

 

[papason]

Yes
a door will be installed and expected to be there a loong time

 

[KenGMac]

OK, OSB will do, have you any access to "treated timber" of a similar size to fill the opening and allow your new door frame to fit?

Or? use timber "packers" between new door frame and structure, clad inside and out with treated timber, infill the gap with expanding foam for Insulation.

Find out the size you need to fill between new frame and structure, split the difference between each side and find, make, cut packers so that the new frame fits snugly, fit the packers to the structure and the new frame to the packers. Then fill with the expanding foam.

Worth a look?

Ken

 

[He who knows]

Yes
a door will be installed and expected to be there a loong time

What is the construction method of the existing wall?