Information
-
Patent Grant
-
6256957
-
Patent Number
6,256,957
-
Date Filed
Monday, August 10, 199826 years ago
-
Date Issued
Tuesday, July 10, 200123 years ago
-
Inventors
-
-
Examiners
- Kent; Christopher T.
- Thissell; Jennifer I.
Agents
-
CPC
-
US Classifications
Field of Search
US
- 052 3093
- 052 3097
- 052 3098
- 052 30912
- 052 30913
- 052 30914
- 052 30915
- 052 30916
- 052 7831
- 052 78319
- 052 408
- 052 410
- 052 411
- 052 413
- 052 199
-
International Classifications
-
Abstract
A roofing system incorporating lightweight concrete. The system includes a deck and an insulation board. Lightweight concrete is placed between the deck and the insulation board. The deck includes upper and lower flutes and the insulation board has a plurality of channels formed therein. The lower flutes and channels form ribs in the concrete layer that strengthen the roofing system. The concrete layer may be attached to the deck by a series of protrusions in the deck that extend into the concrete. Alternatively, the concrete layer may float above the deck to prevent cracking. A release agent may be used to prevent the concrete layer from adhering to the deck.
Description
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.
BRIEF DESCRIPTION OF THE DRAWINGS
Referring now to the drawings wherein like elements are numbered alike in the several FIGURES:
FIG. 1
is a cross-sectional view of a conventional roofing system.
FIG. 2
is an enlarged view of a portion of the conventional roof system of
FIG. 1
;
FIGS. 3A-3C
are cross-sectional views of the roof deck and the insulation board;
FIG. 4
is a cross-sectional view of the roof deck and insulation board;
FIG. 5A
is a cross-sectional view of the roof system including lightweight concrete;
FIG. 5B
is a cross-sectional view of an alternative top surface of the roof system including lightweight concrete;
FIG. 6
is a cross-sectional view of a roof system having a sealed roof deck;
FIG. 7
is a cross-sectional view of an alternative roof deck;
FIG. 8
perspective cut-away view of a roof system including cables placed in the roof deck;
FIG. 9
cross-sectional view of the cable surrounded by concrete; and
FIG. 10
is a cross-sectional view of an alternative roof system.
DETAILED DESCRIPTION OF THE INVENTION
FIGS. 3A-3C
are cross-sectional views of a roof deck
10
and an insulation board
12
. The roof deck
10
may be made by overlapping corrugated panels made from metal or a concrete tectum composite. Alternatively, the roof deck
10
may be poured in place monolithic. The insulation board
12
may be a polystyrene material. As shown in
FIG. 3A
, the roof deck
10
is corrugated and includes a plurality of high flutes
15
and low flutes
14
. The low flutes
14
in
FIG. 3A
are C-shaped. Formed in the insulation board
12
, above each low flute
14
, is a channel
16
. The channel
16
in
FIG. 3A
has a triangular cross section. The lightweight concrete is placed between the insulation board
12
and the deck
10
to strengthen the roof assembly. By including channels
16
in the insulation board
12
, the cured concrete includes a plurality of ribs defined by the channels
16
and the lower flutes
14
that strengthen the concrete form. The strength of the concrete will additionally strengthen the deck
10
against bowing movement and wind uplift pressures. Accordingly, it is less likely that the concrete will become detached from the deck
10
and subsequently crack.
FIG. 3B
shows an alternative channel
18
which has curved cross section.
FIG. 3C
shows another alternative channel
22
having a trapezoidal cross section and a lower flute
20
formed in the deck
10
having a trapezoidal cross section.
FIG. 4
is a cross-sectional view of the insulation board
12
positioned above the deck
10
. A nail and disk
24
is placed in the deck
10
so that the bottom of the insulation board
12
is positioned approximately ½ above the upper flute
15
of the deck
10
. The lightweight concrete is then pumped into the space between the insulation board
12
and the deck
10
. A block
26
may also be placed between the deck
10
and the insulation board
12
to prevent the movement of the concrete beyond a desired area.
FIG. 5
is a cross-sectional view of the roofing system including the lightweight concrete. Holes
28
are formed in the insulation board
12
. Once concrete
30
is placed in the area between the deck
10
and the insulation board
12
, pressure is applied to the top of insulation board
12
. This causes the concrete
30
to be forced up through holes
28
to the top surface of the insulation board
12
. Additional concrete may be poured over the top of the insulation board
12
to form a top concrete layer
32
. The top concrete layer
32
may include a reinforcement structure
34
in the form of an elastic or polymeric mesh. Preferably, the mesh (scrim) is comprised of polyester or fiberglass and preferably includes a coating to inhibit deterioration from the highly alkaline compounds inherent in concrete. Mesh material that may be employed in the invention is Bond coat polyester or JPStevens fiberglass open mesh sheets both of which are commercially available from a variety of sources common and known to the industry. The elastic or polymeric mesh is fastened to the side edges of the insulation board
12
and is embedded (floated) in the top concrete layer
32
. An additional benefit of the polymeric material is that it is light in weight. Therefore, the mesh “floats” near or at the top surface of the concrete. This has several advantages: the mesh holds water in the concrete to provide for a better cure of the concrete, provides a more aesthetically pleasing finish due to mitigating effects on bumps or lumps, and, importantly, the location of the mesh near the top surface of the concrete endows the concrete with greater resistance to fracture. Benefits as set forth can also be obtained if scrim is laid over partially cured concrete and an additional layer of concrete is poured thereover. As shown in
FIG. 5B
, additional ribs
33
may be formed in the top concrete layer
32
to provide additional rigidity. The ribs
33
may be either parallel or perpendicular to the ribs formed by channel
22
in the insulation board
12
. The channels
22
formed in the insulation board
12
create ribs in the concrete
30
and enhance the strength of the deck
10
thereby reducing the likelihood that the deck
10
will flex causing the concrete
30
to become detached from the deck
10
and crack.
The combination of the deck
10
and the lightweight concrete assembly comprising the insulation board, bottom concrete layer
30
and top concrete layer
32
is fastened with mechanical fasteners between roof girder or joists with so that the roof would naturally bow between girders. A roof membrane, similar to membrane
107
in
FIG. 1
, is then laid loose or adhesively attached to the mechanical fasteners connecting the roof system to the girders or joists.
The deck
10
may be air sealed in a variety of ways. The deck
10
may be made from individual panels as shown in FIG.
1
. These panels overlap at their ends and a caulk
112
is placed between the overlapping ends to seal the deck. Alternatively, as shown in
FIG. 6
, an air impermeable film
36
may be placed over the deck
10
to create an air sealed deck.
As mentioned previously, the concrete may be attached to the deck to create an even stronger structure and to prevent the concrete from becoming detached from the deck.
FIG. 7
shows a deck structure that prevents concrete from becoming detached from the deck. The deck
40
is similar to deck
10
described above except that the upper flute
41
includes a protrusion
42
extending into the area defined by the lower flute to create a recess
44
in the lower flute. When the concrete is poured over the deck
40
, the recess
44
is filled with liquid concrete. When the concrete hardens, the protrusion
42
prevents the concrete from becoming detached from the deck
40
. It is understood that other formations in the deck
10
may be used to affix the concrete layer
30
to the deck
10
. This creates a solid deck and reduces the likelihood that the deck will flex or that the concrete will become detached from the deck and cause the concrete to crack.
As mentioned above, the concrete may alternatively float above the deck. As the deck bends or flexes, the concrete can pull away from the deck and prevent stress on the concrete.
FIG. 8
is a perspective cutaway view of a system for allowing the concrete to float relative to the deck. In
FIG. 8
, a lower flute
20
includes a cable
48
. The cable
48
is attached to the roof system by fastener
50
that attaches the cable
48
to the purlins
102
. As shown in
FIG. 9
, when the concrete
30
is poured over the deck
10
, the concrete
30
flows around cable
48
and cable
48
becomes embedded in the hardened concrete
30
. The ribs formed opposite the lower flute are not shown for ease of illustration. In the embodiment shown in
FIGS. 8 and 9
, the deck is not air sealed, so uplift wind forces are applied to the deck
10
and the concrete layer
30
. The concrete
30
may pull away from the deck
10
when the deck flexes thereby preventing the concrete
30
from cracking. The cable
48
prevents the concrete
30
from moving too far from the deck
10
. When the uplift wind force has subsided, the concrete
30
comes back into contact with the deck
10
. A release agent
52
, such as an oil or a thin membrane having a low coefficient of friction, may be placed over the deck
10
to prevent the concrete
30
from adhering to the deck
10
and allowing the concrete
30
to freely float above the deck
10
.
If the deck
10
is sealed, then the uplift wind force is applied to the deck
10
and does not directly contact the concrete
30
. As shown in
FIG. 10
, the cable
48
is not needed to keep the concrete
30
proximate to the deck
10
. The uplift wind force will be applied to the deck
10
. If the deck
10
flexes or bends, the concrete
30
will rise above the deck
10
preventing stress and cracking of the concrete
30
.
While preferred embodiments have been shown and described, various modifications and substitutions may be made thereto without departing from the spirit and scope of the invention. Accordingly, it is to be understood that the present invention has been described by way of illustration and not limitation.
Claims
- 1. A lightweight concrete roofing system comprising:a roof deck, said deck comprising a plurality of upper flutes and lower flutes disposed therein; a structure configured to support said roof deck; a lightweight continuous concrete layer having a plurality of ribs formed therein disposed on said roof deck, said lightweight concrete layer being screeded to a desired finished slope; a coated fiberglass open mesh cloth embedded within said lightweight concrete layer; an insulation board positioned over said concrete layer, said insulation board comprising a plurality of channels therein, said ribs of said roof deck being defined by said lower flutes of said roof deck and said channels of said insulation board.
- 2. The roofing system of claim 1, wherein said insulation board has a top surface, said top surface being covered with a top concrete layer.
- 3. The roofing system of claim 2, wherein said top concrete layer comprises a reinforcement structure embedded in said top concrete layer.
- 4. The roofing system of claim 3, wherein said reinforcement structure is a coated fiberglass open mesh cloth.
- 5. The roofing system of claim 3, wherein said reinforcement structure is an open mesh cloth fabricated from a polymeric material.
- 6. The roofing system of claim 3, wherein said reinforcement structure is an open mesh cloth fabricated from an elastic material.
- 7. The roofing system of claim 2 further comprising a waterproofing membrane positioned above said top concrete layer.
- 8. The roofing system of claim 1, wherein said deck is formed from a plurality of overlapping concrete tectum panels.
- 9. The roofing system of claim 1, wherein said deck is a poured monolithic deck.
- 10. The roofing system of claim 3, wherein said reinforcement structure is an open mesh cloth fabricated from a fiberglass material.
- 11. The roofing system of claim 7 wherein said waterproofing membrane comprises a member loosely laid over said top concrete layer and sealed along a perimeter thereof and sealed at any penetrations thereto, and wherein said waterproofing membrane is held against said top concrete layer by a pressure differential across a profile of said waterproofing membrane.
- 12. A roofing deck comprising:a plurality of upper flutes and lower flutes; a protrusion extending from at least one of said upper flutes into a space defined by at least one of said lower flutes to form a recess for receiving concrete and attaching the concrete layer to said deck.
- 13. A roofing system comprising:a deck; a lightweight concrete layer movably positioned on a top side of said deck; and a cable having a first end and a second end, said first end being attached to said top side of said deck and said second end being attached to said lightweight concrete layer.
- 14. The roofing system of claim 13 wherein said deck is air permeable.
- 15. The roofing system of claim 14 wherein said deck comprises a plurality of upper flutes and lower flutes, and wherein said cable is positioned in said lower flute, said cable connecting said deck with said lightweight concrete layer.
- 16. The roofing system of claim 14 wherein said deck is positioned above purlins, said roofing system further comprising a fastener for connecting said cable to at least one purlin.
- 17. The roofing system of claim 15 wherein said deck is positioned above purlins, said roofing system further comprising a fastener for connecting said cable to at least one purlin.
- 18. The roofing system of claim 13 wherein said deck is sealed.
- 19. The roofing system of claim 13 further comprising a release agent between said concrete layer and said deck, said release agent preventing said concrete layer from adhering to said deck.
- 20. The roofing system of claim 19 wherein said release agent is an oil.
- 21. The roofing system of claim 19 wherein said release agent is a sheet of material having a low coefficient of friction.
- 22. The roofing system of claim 4 wherein said roof deck comprises a plurality of panels, said panels being permeable by air.
- 23. A roof deck comprising:a corrugated metal material having tabs extending from a surface of said material, said tabs being contiguously formed with said surface of said material and extending into an area defined by a lower flute to create a recess in said lower flute thereby providing an anchoring point for hardened concrete.
- 24. A lightweight concrete roofing system comprising:a roof deck said deck comprising a plurality of upper flutes and lower flutes disposed therein, said deck being formed from a plurality of overlapping metal panels, said overlapping metal panels being configured to form joints therebetween; a structure configured to support said roof deck, a lightweight continuous concrete layer having a plurality of ribs formed therein disposed on said roof deck, said lightweight concrete layer being screeded to a desired finished slope; at least one fin protruding from a surface of said roof deck to increase adhesive properties of said lightweight concrete layers a coated fiberglass open mesh cloth embedded within said lightweight concrete layer; an insulation board positioned over said concrete layer, said insulation board comprising a plurality of channels therein, said ribs of said roof deck being defined by said lower flutes of said roof deck and said channels of said insulation board.
- 25. The roofing system of claim 24 wherein said joints are sufficiently sealed with a caulk thereby preventing the flow of air through said joints.
- 26. The roofing system of claim 25 wherein said caulk is a rubber-based caulk.
- 27. The roofing system of claim 25 wherein said joints are sealed with a membrane cover strip.
US Referenced Citations (25)