Can these be used outside to keep rain water from coming in under a door?

For the most part yes. It depends on how much water is coming up against your door.

Why can’t you use this outside? How thick or high does it get?

only an inch or so thick. we use inside garage door.

I got some two fall seasons ago that were black. They worked extremely well for what I was wanting them for. I stored them in a dry area and out of the sun. Last fall I bought some more but they were orange. For what ever reason they did not work as well, so I hauled out the old ones and sure enough, most of them still expanded and worked well. If they lose the inside material they will not expand. By the black ones if you can.

ASIN	B07NGYK4WW
Batteries Required?	No
Best Sellers Rank	#343,188 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #374 in Safe Accessories
Color	Orange
Customer Reviews	3.7 3.7 out of 5 stars (14)
Date First Available	February 7, 2019
Included Components	(1) Hi-Vis Orange Bucket, (10) 10ft Indoor Water Dams
Item Package Quantity	1
Item Weight	11.43 pounds
Item model number	WUGG10-10
Manufacturer	Quick Dam
Part Number	WUGG10-10
Product Dimensions	12 x 14 x 14 inches
Thickness	11 Inches
Warranty Description	Against manufacturer defects

Quick Dam WUGG10-10 Emergency Flood Kit – 10 Pack of 10ft Water Dams (100ft Total) – Absorbs 3.75 Gal Each – Fast-Acting Indoor Flood Barrier with Hi-Vis Orange Bucket

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