After replacing the rotted sill and studs in my old (1918) garage, I removed the lower 16" of the tongue & grove siding and replaced with 3/4" OSB. Now I'd like to cover the entire garage with vinyl siding, to match our house. Question 1: Do I cover the entire garage (including the tongue & grove siding) with waterproof felt, or just the new OSB? The old siding is covered with peeling lead-based paint. Question 2: Obviously, I need to put a hard backing behind the vinyl siding to create a flat surface. (The old tongue & groove siding on the upper part of the garage is tapered.) Are 1/2" insulation panels the best way of doing this, or is there a better approach for unheated, detached garages? Any advice is very much appreciated.

My garage door is powered by a garage door opener...when the door is going down,it gets about half way down and it starts to "sway " and buck..somethings not right ..the door does get to the down posistion but I'm worried some thing might really go hay-wire if I dont fix it..any suggestions???