1. How wide is a Lite-Deck section?
sections are 24-inches wide and feature 2 steel stiffeners, 12-inches
apart. Sections can also be provided which are 48-inches wide (4
steel stiffeners). They reduce the amount of handling at the jobsite.
Because of weight, the 48-inch sections are not recommended for
lengths over 30'.
2. How long is a Lite-Deck section?
Sections are provided in custom
lengths (+ or - 1/4 inch) as ordered. Lengths up to 53-feet can
be shipped on commercial flatbeds.
3. How far can Lite-Deck clearspan?
Clear (unsupported) spans
of 40-feet and more can be engineered. Most short spans (up to
12 feet) can be accomplished with 6-inch deep sections. Spans of
30 to 40-feet are accomplished with 16-inch deep sections.
4. Can I cut a Lite-Deck section?
Yes. The form and steel stiffener
can be cut with a reciprocating saw.
5. What is the R-value?
The R-value will vary, depending on the
thickness of the sections. The polystyrene has an overall R-value
of 4.5 per inch. So, 6-inch deep sections have a nominal R-value
of 27 prior to interior and exterior finishing. The insulating
value for the load-bearing joist portion is an R-9.
6. Does Lite-Deck have to be covered on the interior?
building codes require that exposed polystyrene be covered with
a fire-resistant material. If Lite-Deck is being used as a home's
floor or roof, insulation exposed to the living area can be covered
with drywall (gypsum board). Some commercial or institutional applications
may require that the sections be covered with a commercial grade
coating such as polyurethane.
7. How much concrete is poured
on top of Lite-Deck? To get the
full strength of the load-bearing joist, the concrete cover must
be a minimum of 2-inches. Engineers may require covers of 3" or
more, for special applications.
8. How do I run plumbing and
electrical lines? Blockouts should be cut into the forms as they are being placed.
Lengths of plastic pipe will serve as a blockout. Blockouts should
be located between the joists and steel stiffeners.
9. Must all of the concrete
be placed in one operation? No. Concrete
can be placed into the joist portion only and be allowed to cure.
The concrete cover can then be placed in a separate operation.
Leave shoring or bracing in place, for both operations. A 2-stage
placement may not be appropriate for some projects. Consult with
the project's structural engineer for their guidelines on placement.
10. Can the concrete cover
be colorized or stamped? Yes.
11. How do you finish the
Lite-Deck floor in a home?
cover can be troweled to a smooth finish or a skin coat of lightweight
concrete can be placed, for a finished appearance. When applying
finishes or materials directly to the concrete cover, always follow
the manufacturer's instructions for proper application. If the
floor is being carpeted, 1/2" plywood should be placed, anchored
directly to the concrete with mastic or masonry nails.
12. What is used to seal a
Commercial roofs can
be sealed with an Elastomeric coating applied directly to the concrete
cover. Rubber Membranes or Steel Rib systems can also be applied
directly. More conventional finishes (such as residential shingles)
can be installed over furring strips which are anchored directly
to the concrete cover. Always follow the manufacturer's instructions
for proper applications.
13. Do you have to use special
concrete specs: 4,000 to 5,000 PSI - 4 to 6 inch slump - 1/2
to 3/4 inch aggregate. Structural engineer or local building
codes may require slightly different specs.
14. Can I use plasticizers?
Yes, water reducers can be used to
15. Can Lite-Deck be vibrated?
Yes. Vibrator should be used by
an experienced operator.
16. How much rebar (reinforcing
steel) do I need?
That is determined
by the Structural Engineer for the project. Rebar is placed in
the joist and the cover. In addition, rebar is used to structurally
tie the Deck and walls together.
17. Do I have to use a concrete
No. However, the installer
should avoid accumulating concrete in one spot. This can overburden
the shoring and cause it to fail. A concrete pump is preferred
because delivery can be closely controlled.
18. Does Lite-Deck provide
structural engineering specs?
must be provided by a structural engineer who is licensed for the
type and location of the project. The engineer's specs will show
the best joist depth and the rebar needed, to support the dead
and live loads of the deck or floor.
19. Can the forms be removed?
No. They are designed to stay in
place and provide insulation protection. Research is being done
on removable, re-usable sections.
20. How much does Lite-Deck
Form costs vary from region
to region. To get a realistic estimate, CLICK
HERE for a Directory
of Lite-Deck suppliers and regional manufacturers...they will be
glad to provide general prices or an estimate for a specific project.
21. What is Nominal STC (Sound
The STC rating will vary, depending on the thickness of the sections.
Based on field studies and tests for flat concrete panels, the
calculated Nominal STC rating for Lite-Deck ranges from STC-45
to STC-55 for the most popular sizes of Lite-Deck.
22. What is the Nominal IIC
(Impact Insulation Class)?
To date, no clinical tests have been conducted to determine Lite-Deck's
IIC rating. However, the following ratings have been acheived
for similar concrete floor/ceiling designs:
Flat 6" concrete slab - No covering: IIC 34 / With wood
sheathing, pad and carpet: IIC 81
2" slab w/14" T Joists - No covering: IIC 24 / With
carpet and pad: IIC 72
4" slab No covering: IIC 20 / With 1" Gypsum Board:
5.75" slab No covering: IIC 27 / With 1" Gypsum Board:
The presence of closed-cell EPS (Expanded Polystyrene) in Lite-Deck's
forms do not significatly change the IIC ratings of the concrete
21. Can I construct a sloped or gabled roof
Yes. The Lite-Deck forms can be structurally engineered to produce
sloped roofs. The techniques for concrete placement can be modified
to insure a consistent concrete cover. This type of construction
is preferred for concrete homes with "vaulted" or open
Didn't find the answer to your question?
Call: 800-551-3313 (US and Canada) and ask for a Lite-Deck Service
Representative or e-mail your question to: email@example.com