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We're converting our garage into a rumpus room and has used epoxy to freshen up the concrete floor. We had a huge downpour yesterday and found a large pool of water behing the door this morning. I've looking into external door seals, but the door is hollow and smaller than a standard size so difficult to fit a door seal at the bottom.
My thoughts are: an awning (longer term plan) to provide some protection; a wooden, painted threshold/piece of timber at the base of the door frame fixed to the floor and thirdly, a new door fitted with external door seal (more expensive). The door faces west so cops the rain quite a bit. Open to suggestions, thanks!
Welcome to the Bunnings Workshop community @Heidi81. It's fabulous to have you join us, and many thanks for your question about weatherproofing a door.
Hollow core doors have a solid timber frame around their perimeter, including the bottom edge. So, you might still be able to install a proper door seal. You wouldn't have any issue at all using a self-adhesive version. Door seals are cut down to suit the size of your door, so fitting to a door smaller than the standard size shouldn't be an issue.
If your threshold is not sloped away from the door, then even with a seal, the water will creep under the door. If this is the case, then your idea of installing an awning or a timber beading at the bottom would be a good solution.
Please let me know if you have any questions.
Mitchell
Afternoon @Heidi81
Id definently go with @MitchellMc's suggestion on this one. I had the same issue and installed one looking very much like the link shows. Its still working a dream tho I do need to tighten up the screws underneath the flap as they are catching (its been there for 3ish years)
It took all of 5mins to install 
Dave
