Here in california it usually takes 20 minutes to 30 minutes in full sun.
How to strighten a warpped barn door.
When the door is flat take it back inside and rehang it.
Remove the door sand and seal it with primer or polyurethane on the top and bottom edges.
Sanding is the next.
Choose an area within a few inches of the corner where there s solid thick wood.
Then clamp the door flat.
Prop up one of the sagging doors to the height you want by tapping a block of wood under the end away from the hinges.
Remove the door from the jamb by unscrewing the hinges on the jamb side.
Set your iron to the highest temperature and let it heat properly for about 2 6 minutes.
The concave part needs to face downwards.
Each day rewet the towels and add five to 10 pounds of weight onto the door until is is completely straight again.
Fit these rods and you can introduce tension at the back of the door in eit.
If the door is pine it s even more likely to warp.
For a slightly bowed door take a heavy weight and lay.
Put the door on a flat surface a wide workbench is best so that the door cups upward.
Warped doors are a fact of life in most older homes.
Now keep your wrapped wood on a flat surface that also will be able to bear the temperature of your iron.
You don t need to replace them.
Do you have some wardrobe doors that are bowing.
I would replace the door because that s the easiest solution but if you have more patience than i do here are tips for flattening a warped door.
How to fix a badly warped pine door warp.
Place the door across two.
Drill a small pilot hole for an eye screw in the top corner near the hinges and in the lower corner away from the hinges.
Leave the sandbag on the door for 24 hours or until the warp is completely gone.
Cut lengths of 2x4 and place them across the door along the bowed edges to pin the door between the strips and the flat work surface.
If the door goes too far and warps the other way just turn it over and warp it back.
The amount of time it takes to remove the warp depends on how hot the sun is and how badly the door is warped.
If your door is badly warped wet your heavy towels or large blankets and lay them across the warped area only.