Water under door thresholds.

[Bob Rowlands]

Some door sweeps have an extended lip -like a small awning at the bottom of the door- that directs water well out onto the sloped threshold.

Aquaseal is my 'GO TO' sealant for repairing tears and seams on waders, tent fly, boots, poncho, and a few other places I can't recall offhand. If Aquaseal will adhere to the substrate, (it will not on some types of fabric coatings) you will have a tough permanent repair that is extremely wear resistant, tough, and flexible. I extended the life of the toe of my boots with aquaseal. Yes, it IS that tough.

It's expensive in the little tubes. If you have a pile of gear to repair buy the 8 oz tube it is far more reasonable. I think you can find the 1 oz tubes online, that's the size I used to buy. Be aware it will cure by itself in the tube if you leave it stored for an extended period.

[UKadventurer]

Originally Posted by Bob Rowlands

Some door sweeps have an extended lip -like a small awning at the bottom of the door- that directs water well out onto the sloped threshold.

We've had a few small leaks under doors and windows. Although the rainy season is more or less over, I've been thinking about how to address this too.

In the case of thresholds and bottom sills, I remember English windows and door sills have a groove cut in the underside of the wood. This interrupts any water that attempts to track under the sill horizontally. That's probably old school these days and aluminum drip edges are probably more common, especially in the USA, if I remember correctly.

I tried to buy some drip edges in the building materials zone of Ulaanbaatar but they didn't have any premade. Instead they could cut and form sheet aluminum if I gave them a spec.

Another option, would be to cut a rain-drip groove into sills and thresholds after the installation. This seems awkward because there is often little space to get a power tool, such as a handheld router in the limited space between the foundation and the wood sill.

Any suggestions on how to get a functional drip-edge or drip-interruptor on bottom sills after installation. There's a bit of an overhang of these so I think a small specialist tool might work to cut a groove.

[UKadventurer]

This diagram is intended to clarify what I discussed in my previous post.