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It sounds like you are using a conventional door in horizontal sections, guided by rollers in tracks on each side? I've hung a few of these in pole structures. As said, the door presses up against the inside of the opening. But what really counts in selecting the opening is where the track mounts will attach on each side of the door. The track mountings usually have various options, including reversing the brackets. Whatever the case, you want the track mounts securely attached to meaningful framing - not just to 2x4's spiked to the siding stringers, for example. Ideally, you have poles on each side of the door opening, and you can either use the poles themselves or build them up with 1 or 2 pieces of 2x to give you a solid mounting for the door tracks. If you are putting the door somewhere other than an opening with poles directly on each side, you need to stop and thing about the structure you will need to add to support both the door AND the interruption in the siding. A proper header (directly attached to the poles) is especially important. As to the opening, I make them 2" smaller than the width of the door panels (1" overlap each side) and 1" shorter than the height OA of the door. But then I trim the opening with 2x material with the weatherseal mounted to that. Reasons being 1) that if a careless driver does hit the side of the opening, there will be something more substantial than just weathersealing to wear off before the barn siding and trim starts to get torn up, and 2) the thickness of the 2x trim affords some protection to the track assemblies, and protects them from being torn off and potentially bringing the whole door down on your head. The 2x trim is easy to replace, much easier than re-trimming the depth of the door opening after a contact incident. Yes, it costs a little in the door opening. HTH llater, llamas
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