Legrand WKD Pro Series System - Manual (Page 11)

11
WORK SUBSEQUENT TO UNDERFLOOR DUCT INSTALLATION BY OTHER CONTRACTORS:
1. Concrete Placement and Curing:
a. Reinforced concrete design shall be in accordance with American Concrete Institute Specifications for Structural Concrete
for Buildings (ACI301-72) and ACI Building Code Requirements for Reinforced Concrete (ACI318-83). Any mixture
containing chloride salts such as calcium chloride shall not be used, as such mixtures have proven harmful to
steel and steel finish.
b. Concrete placement shall follow proper and accepted industry practice and in accordance with ACI Recommended
Practice for Measuring, Mixing, Transporting and Placing Concrete (ACI304-73). Concrete must be vibrated at all
junction boxes and ducts to insure that the concrete completely fills underneath the system. However, it is
imperative that the concrete not be over vibrated. Over vibration causes segregation of material in the concrete mix
which, in turn, leads to weakening of concrete.
c. Concrete curing shall follow proper and accepted industry practice and be in accordance with ACI301-72.
2. After the Concrete Pour:
a. When material or equipment loads that could deform junction box cover plates will be placed or moved over the cover
plates, install temporary planking that will transfer loads to the adjacent concrete. Cover plates and underfloor duct
that are damaged during construction must be replaced. This will not be the responsibility of Wiremold/Legrand.
b. Excess moisture should be removed from inside the system within 48 hours of the concrete pour. Remove junction box
cover plates where water may have entered to check for water accumulation or condensation. Depending on job site and
weather conditions, cover plates removed on several boxes will help prevent condensation. If water is left in the system,
it may freeze and cause severe damage to the underfloor duct, the junction boxes or the floor slab. Water or condensation
will also cause galvanized coating to corrode.
3. Floor Finishes:
Various styles of cover plate trim or holders are available to accommodate tile and carpet. Contact your local Wiremold
field sales representative for more information.