(100 square feet) to measure wet film thickness of coating during
application. During application of intermediate and finish coats, place
plates on surface of previously applied coat in same manner.
3.9.3
Slit samples
Inspect top-coated foam by cutting a minimum of one V-shaped 50 mm (2 inch)
long by 6 mm (1/4 inch) deep sample for every 100 square meters (1000
square feet) of roof area as selected at random by the Contracting Officer.
One edge of the V-shaped sample shall be at a 90 degree angle to the
coated surface. Examine and measure coating thickness of each sample with
an optical comparator. Inspect samples at peaks of surface texture of
foam, not at valleys. Do not average measurements of DFT of coating.
Report slit sample observations in the daily log and provide slit samples
to the Government as a part of the daily log. Bag slit samples and
identify by sequentially numbering, dating, and locating on roof plan.
Completely seal cut areas by filling them with and lapping over adjacent
undisturbed coating with caulking material recommended by the coating
manufacturer. Recoat areas where representative samples indicate
inadequate thickness and sample again until specified DFT is achieved.
3.9.4
Core samples
Remove minimum of one, 50 mm (2 inch) diameter or 50 mm (2 inch) square
core sample from each day's foam application as directed by the Contracting
Officer. Visually examine core samples for proper foam thickness, lift
thickness, cell formation and adhesion. Foam shall be free of blisters,
voids, and delaminations, and shall display full cell formation without
spongy nature or brittleness. Identify core samples by sequentially
numbering, dating, and locating on roof plan. Report core sample
observations on daily log. Maintain core samples at the job site
throughout the work for observation by Government personnel. Provide core
samples to the Government at completion of the work.
Additional core
samples shall be taken as directed by the Contracting Officer for
laboratory testing to verify conditions and material properties, including
compressive strength, density, and cell structure by test methods outlined
in ASTM D 5469. Additional cores shall not exceed one for each day's
application unless deficiencies are found that require further testing to
determine extent of such deficiency. Laboratory testing shall be conducted
by an independent laboratory approved by the Contracting Officer and at no
additional cost to the Government. The Government maintains the right to
conduct laboratory testing of core samples for confirmation of conditions.
All core locations shall be repaired to a watertight condition with spray
applied foam or foam plug set in compatible sealant. Protective coating
shall be applied in the specified manner to the repaired area.
[3.9.5
Manufacturer's Field Inspection
Manufacturer's technical representative shall visit the site as necessary
during the installation process to ensure roof system materials are being
applied in a satisfactory manner. As a minimum, manufacturer's technical
representative shall be present at work start-up and perform field
inspection of the first day's completed application and at substantial
completion, prior to demobilization of roofing contractor. Inspections
shall be conducted in the presence of Government representatives. After
each inspection, an inspection report signed by the manufacturer's
technical representative, shall be submitted to the Contracting Officer
within 2 working days. The inspection report shall note overall quality of
work, deficiencies and any other concerns, and recommended corrective
SECTION 07570
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