I usually try to write an article, every month or so, for my web site. I have just completed one dealing with a local problem, water intrusion into newer masonry buildings.
Please take a look and post any corrections or suggestions.
Larry is right, there is no apostrophe called for since it doesn’t show possession.
In the sentence…when water* that* has been absorbed - you should eliminate the word that, so the phrase goes better with the word “and” later. This makes the sentence less clumsy (read it aloud and you’ll see what I mean.)
further down, when you say the regions expert, you are showing possession; ie, it is the expert of the region, so it should read region’s expert.