b.
29 CFR 1910.1000.
c.
Threshold Limit Values (R) of the American Conference of
Governmental Industrial Hygienists.
d.
Manufacturer's material safety data sheets.
1.8
ENVIRONMENTAL CONDITIONS
1.8.1
Weather and Substrate Conditions
Do not proceed with application of water repellents under any of the
following conditions, except with written recommendations of manufacturer.
a.
Ambient temperature is less than 4 degrees C 40 degrees F.
b.
Substrate faces have cured less than one month.
c.
Rain or temperature below 4 degrees C 40 degrees F are predicted
for a period of 24 hours before or after treatment.
d.
Earlier than three days after surfaces are wet.
e.
Substrate is frozen or surface temperature is less than 4 degrees C
40 degrees F and falling.
1.8.2
Moisture Condition
Determine moisture content of substrate meets manufacturer's requirements
prior to application of water repellent material.
1.9
SEQUENCING AND SCHEDULING
1.9.1
Masonry Surfaces
Do not start water repellent coating until all joint tooling, pointing and
masonry cleaning operations have been completed. Allow masonry to cure for
at least 60 days under normal weather conditions before applying water
repellent.
1.9.2
Plaster Surfaces
Do not start water repellent coating until all shrinkage and stress cracks
are repaired and sound, all surfaces are free of defects and cleaning
operations have been completed. Allow plaster to cure for at least 30 days
under normal weather conditions before applying water repellent.
1.9.3
Concrete Surfaces
Do not start water repellent coating until all patching, pointing and
cleaning operations have been completed and concrete has cured a minimum of
30 days under normal weather conditions.
1.9.4
Sealants
Do not apply water repellents until the sealants for joints adjacent to
surfaces receiving water repellent treatment have been installed and cured.
a.
Water repellent work may precede sealant application only if
SECTION 07190
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