4 
House & G a r d e i 
The actual thickness of a 
sheet of Sheetrock is fi-inch 
of pure gypsum plaster 
.... 
"Our entire yard was in flames, and the warehouse and 
all other merchandise in it was completely destroyed. 
But the Sheetrock, though subjected to most intense 
heat and the action of tons of water, remained intact 
...fireproof!"-King Lumber Co., Kansas City, Mo. 
Only a Sheet of Rock Could Stand It! 
The whole story of Sheetrock’s fireproof nature 
is told in the letter from which the foregoing 
facts were taken. 
Mr. Walter J. Wood, Secretary of the King 
Lumber Company, in the same letter relates the 
amazement with which they discovered, four 
days later, that the Sheetrock was still in good 
shape and suitable for wallboard purposes. 
“We have seen several jobs in which this 
very board was used,” he writes, “and after 
panel strips and paint had been applied, it 
was impossible to find any traces of fire.” 
Sheetrock is the fireproof wallboard. It is a 
rock product — and it cannot burn, ignite or 
transmit heat. It is gypsum plaster, cast in 
sheets, and makes smooth-surfaced, non-warping, 
permanent walls and ceilings. 
Your dealer in lumber or in builders’ supplies 
sells Sheetrock for new construction, altera¬ 
tions or repairs. The carpenter puts it up. 
Our free booklet, “Walls of Worth,” pictures 
its many uses and advantages. 
UNITED STATES GYPSUM COMPANY, General Offices: 207 West Monroe Street, Chicago 
World's Largest Producers of Gypsum Products Sheetrock is approved by The Underwriters’ Laboratories , Inc. 
SHEETROCK 
Reg. U. S. Pat. Off 
The FIREPROOF WALLBOARD 
