On 1/24/2014 8:23 AM, Alan Smith wrote:
A threshold is a strip across the bottom of a door opening that seals
it when the door is closed, so cold (or hot) air does not seep in
under the door. A threshold can be wood, metal or vinyl, but a
popular option is aluminum, which is resistant to rot or water
damage, cleans easily and requires no regular maintenance. Many
aluminum thresholds have rubber strips that flex when the door is
closed to provide a tighter seal. Replacing a threshold with a new
aluminum one is fairly simple.Measure the bottom of the doorway with
a tape measure and buy an aluminum threshold to fit; most entry doors
are about 36 inches wide. Match height of the new threshold to the
old; make sure the new threshold is no higher off the floor to avoid
door closing problems. Use a rubber-centered threshold if the old one
had such a piece. For more information
http://www.buyliquidroof.com/liquid-coatings.html


The most durable seal especially for commercial doors where there is a
lot of traffic, is a solid flat threshold and the seal on the bottom of
the door. A brush strip seal on both sides works very well. ^_^

TDD