3.4.1.4
Rate of Application
Apply materials to exterior surfaces at the coverages recommended by the
manufacturer and as determined from sample panel test. Increase or decrease
application rates depending upon the surface texture and porosity of the
substrate so as to achieve even appearance and total water repellency.
3.4.1.5
Number of Coats
The sample panel test shall determine the number of coats required to
achieve full coverage and protection.
3.4.1.6
Appearance
If unevenness in appearance, lines of work termination or scaffold lines
exist, or detectable changes from the approved sample panel occur, the
Contracting Officer may require additional treatment at no additional cost
to the Government. Apply any required additional treatment to a natural
break off point.
3.5
CLEANING
Clean all runs, drips, and overspray from adjacent surfaces while the water
repellent treatment is still wet in a manner recommended by the
manufacturer.
3.6
FIELD QUALITY CONTROL
Do not remove drums containing water repellent material from the job site
until completion of all water repellent treatment and until so authorized
by the Contracting Officer.
3.6.1
Field Testing
AAMA 501. At a time not less than twenty days after completion of the
water repellent coating application, subject a representative wall area of
the building to the Navy Hose Stream Field Test similiar to AAMA 501 hose
test to simulated rainfall for a period of three hours. Use a minimum 5/8
inch diameter hose and a fixed lawn sprinkler spray head which will direct
a full flow of water against the wall. Place the sprinkler head so that
the water will strike the wall downward at a 45 degree angle to the wall.
If the inside of the wall shows any trace of moisture during or following
the test, apply another coat of water repellent, at the manufacturer's
recommended coverage rate to the entire building. Repeat testing and
re-coating process until no moisture shows on the inside wall face.
Accomplish any required work retesting and re-coating at no additional cost
to the Government.
3.6.2
Site Inspection
Inspect treatment in progress by manufacturer's representative to verify
compliance with manufacturer instructions and recommendations.
-- End of Section --
SECTION 07190
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