Static structures (e.g. – buildings) – Disparate sheet lamina between exposed surfaces of wall,... – Additional material forming bond
Reexamination Certificate
1998-08-10
2001-07-10
Kent, Christopher T. (Department: 3635)
Static structures (e.g., buildings)
Disparate sheet lamina between exposed surfaces of wall,...
Additional material forming bond
C052S411000, C052S783100, C052S309300, C052S309120, C052S408000
Reexamination Certificate
active
06256957
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates generally to roof systems and in particular to a roof system having a roof deck and a lightweight concrete poured over the roof deck.
2. Prior Art
FIG. 1
is a cross-sectional view of a conventional roofing system. This roofing system is described in U.S. Pat. No. 4,888,930, which is incorporated herein by reference. In
FIG. 1
, a roof deck
103
is attached to purlins
102
through fasteners
104
. An insulation board
108
is attached to the deck
103
through fasteners
109
,
110
. A membrane
107
is placed over the top of the insulation board
108
to seal the roof. As shown in
FIG. 2
, the deck
103
maybe sealed by applying a caulk
112
at the deck joints. By sealing the deck
103
, wind uplift forces WF are applied to the deck
103
, and not the insulation board
108
. The deck
103
can be rigidly fastened to the purlins
102
and thus withstand the uplift wind forces.
It is also known in the art to incorporate concrete into a roofing system in order to add stability to the roof. The concrete is placed between the insulation board and the roof deck. Holes are formed in the insulation board and when pressure is applied to the top of the insulation board, the concrete is forced up through the holes. Thus, the concrete provides a stable roof system. When uplift wind force is applied to the deck, the deck flexes causing the concrete to become detached from the deck and crack. This results in roof failure. There is a perceived need in the art for a concrete roof system that is resistant to uplift wind forces.
SUMMARY OF THE INVENTION
The above-discussed and other drawbacks and deficiencies of the prior art are overcome or alleviated by the concrete roof system of the invention. In the present invention, the concrete is either affixed to the roof deck or allowed to float above the roof deck when uplift force is present. Both alternatives reduce cracking of the lightweight concrete. The lightweight concrete may be affixed to the roof deck by providing undercuts in the deck material that hold the concrete to the deck and prevent flexing and cracking. Alternatively, the concrete can float above deck when the deck flexes. The concrete moves away from the deck when uplift forces are present and returns to contact the deck when the uplift force has subsided.
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Cantor & Colburn LLP
Kent Christopher T.
Thissell Jennifer I.
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