Doors and Windows - Help, my threshold is unsupported.

Mike,

[QUOTE]If it's an exterior door, you'll need to make sure that the threshold is fully supported across the width of the door.

I'm finishing up a brand new house, don't ask me how the builder got away with it, but the sub floor under my installed exterior door threshold is out of level by as much as 1/2". So the threshold is off the floor (that's how all those ants and spiders get in). And any chalking they did obviously wouldn’t, didn’t fill that gap. The threshold flexes under weight. When I got to thinking about it, I realized this can’t be right, or good. It’s a Therma-Tru door.
I can seal it by calking the outside bottom edge of the sill, correct? But to, best I can, “fix” the flexing, I am wondering if there is a product I can spray under the threshold from the inside that would harden and support it? (adhesive calk?, trowel some type of cement under there? ...?)
Many thanks,
Matthew

not familiar with that door, just presuming that the threshold is alum. and attached to the door jambs! right? does the door hang right without binding? if the door works properly, and the gap is not noticeably wide, spray in foam that hardens might do what you want, if you can't get under it to use wood. is taking the door down and repairing it the right way too big a problem?

matth3w,

I'm going to close the other thread that you asked this question in. But I will leave it visible so thers can read my response.

The "fix" is to remove the door and float Fix-All across the opening between the walls for the threshold to sit solidly on.

But before you do that, MAKE SURE that your level is accurate! Lay it across the floor and see what it says is high. Then lift it and spin it end for end and read it again. It will show the same side being exactly just as high if it's accurate. If, after spinning it, it says the OTHER SIDE is high, throw the level away.

If you still have questions, hit the "Post Reply" button so everything stays in this thread.

Thanks,

Lefty