--> Waterproofing has double "oo" is mispronounced as "o"
Remember double 'OO' in between the strings waterpr & fing which should not be misspelled with single 'O'
Wrong Spelling:  waterpr-o-fing 
Correct Spelling:  waterpr-oo-fing 
Find more incorrect spellings of Waterproofing to spell right way.