Often the non astragal door will have threshold and or top slide bolts to lock and secure it in place.
How to install french door storm doors.
Https amzn to 2zg2qlr are they worth the price.
Use the long level and carpenter s square to make sure the inside of the opening is square and true.
My new makita tools.
Apply a bead of clear silicone behind the storm door frame all the way around the left top and right side of the door.
Compare your dimensions with the standard french storm door opening size guide.
Measure full height of opening from head exterior trim to threshold where storm doors will attach.
Tighten the door back down.
This molding is on the exterior and attaches to one of the doors and overlaps the other covering the vertical seam.
For standard door frames french doors are also available in pre hung kits making installation simple and straightforward.
Remove trim carefully so you don t damage it and label the pieces as you go to make putting them back up easier.
Remove the old frame around the opening with a hammer and pry bars where you want to install french doors.
Older homes have non standard sized openings so you may need to install a new jamb inside the opening to fit the french doors of your choice.
Loosen the screws that hold the storm door down all the way around and have a friend hold the door a half inch off the wall in its position.
Most french doors have a vertical strip called an astragal that attaches to the leading edge of the active door.