biological laboratories, in similar areas which are
subject to hard wear or spillage of chemicals and
require a high degree of cleanliness, and for
explosive and ammunition facilities.
These systems are for use over normal weight
concrete and will not be used over lightweight
concrete. The selection of a floor system for a
location where resistance to specific chemical
conditions is important should be based upon the
ability of the system to withstand required exposure
conditions. For example, polyesters are suitable
for use where resistance to detergents is required
but should not be used in laboratory or other areas
where spillage of sodium hydroxide or similar strong
alkaline solution occurs; epoxies should not be used
where resistance to oxidizing acids is required or
where resistance to temperatures in excess of 54
degrees C (130 degrees F) is required. Each job
should be evaluated on its own merits considering
exposure conditions, costs, flammability of
materials, and local experience with the various
systems. All provisions relating to the systems not
selected will be deleted.
Check other sections of the specifications to ensure:
1. No vermiculite or perlite aggregates in concrete
substrates.
2. No curing compounds or sealers on concrete
substrates.
3. New concrete receives single trowelled finish;
and no burnished finishes.
4. Vapor barrier is provided under all concrete
slabs-on-grade.
5. Only exterior grade plywood on new plywood
substrates. No interior grade or interior grade
with exterior glue. Plywood is nailed with annular
ring or spiral nails only.
6. No dimension lumber substrate in new
construction; when existing lumber substrates are to
be covered, overlay with 50 by 50 mm (2 by 2 inch)
mesh hardware cloth.
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1.1
REFERENCES
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NOTE: Issue (date) of references included in
project specifications need not be more current than
provided by the latest guide specification. Use of
SpecsIntact automated reference checking is
recommended for projects based on older guide
specifications.
SECTION 09670
Page 4
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