Doors and Windows - 1/4 inch underneath treshold of french doors is causing water damage

Our issue: A 1/4 inch gap on the outside underneath treshold (between treshold and frame of the (new) house) of french doors is causing water damage. Rain is seeping through the gap, the sheetrock is wet and mold is starting, floor trim is bowed and expanded, the carpet is wet!

The builder says the treshold is a fundamental part of the frame of the house and balcony and therefore cannot be replaced.

So how do we fix the gap? How to fix the sheetrock?

Thank you for your advice!

Whether the threshold is replaceable or not isn't an issue. The fact is it SHOULD have been installed in a waterproof manner!! If it was put in wrong, (and since it leaks, IT WAS!) it's up to the builder to fix it, along with all of the damage the leak caused. If he can't or won't, you are going to make life difficult for him.

That gap definately should have been caulked, the door instructions no doubt specifically stated so.

Unless the house was built sub standard, NO DOOR is a part of the framing. Framing suitable for the opening is built, and then the door installed later, sometimes much later, in the building process.

No sure how your door is built, but the on the french doors I just installed ($499 mini blind from home depot), the threshhold was screwed to the door casing from the bottom.

Baring damage to the sub-floor, caulk the gap and get everything dry. Trim is fairly easy to replace as long as it wasn't custom milled.