Patent Publication Number: US-9428910-B2

Title: Ribbed backed panels

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. application Ser. No. 13/032,319, filed Feb. 22, 2011, now U.S. Pat. No. 8,795,813, each of which is hereby incorporated by reference in its entirety. 
    
    
     BACKGROUND AND SUMMARY OF THE INVENTION 
     Exemplary embodiments relate generally to backed panels. Examples of panels that may benefit from exemplary embodiments include siding panels, wall panels, and other similar, suitable, or conventional types of panels. For instance, U.S. Pat. No. 6,321,500 is incorporated by reference in its entirety as one example of a backed panel that may benefit from the present invention. 
     In order to enhance the thermal insulation of building structures, it is known to provide one or more layers or panels of insulating material between a vinyl facing panel and a building structure. The backing may also improve the structural characteristics of the facing panel. Known insulated siding systems exist in many different forms. For instance, it is known to nail large sheets of insulating material to the building structure and then install the siding over the insulating material. Another system places a panel of insulation material in a slot behind the vinyl facing panel. Yet another system pours foam filler into the back of a vinyl facing panel such that the foam filler conforms to the geometry of the vinyl facing panel. 
     In certain applications, furring strips may be used when fastening vinyl siding to a wall or other surface. In some situations, especially in situations where there is an uneven or poor surface, oil canning may result when vinyl siding is applied thereto. General waviness is often a result of an uneven surface behind new siding. In many circumstances, furring strips are required to level a wall prior to siding installation, adding time and cost to the installation process. To install siding over existing hardboard or wood siding, furring strips must be used. In many circumstances, furring strips are typically 1″ by 3″ strips of wood that are nailed vertically every 12″ to 16″ around the entire surface where vinyl siding is applied to a building. The furring strips act as a flat surface to nail the vinyl siding thereto. In many applications, insulated sheathing is applied between each furring strip, further complicating and raising the cost of applying vinyl siding thereafter. Furthermore, furring strips may be currently required in certain locations and municipalities to acquire a desired capillary break between vinyl panels, once again, further complicating and raising the cost of applying vinyl siding. 
     A capillary break is in essence a gap to allow water that penetrates through the decorative cladding, in this example vinyl siding, to flow or evaporate eliminating the possibility of long term water damage to the structure. In known vinyl siding panels, the foam backer, which can be inserted behind vinyl siding or a layer in a composite assembly, does not have any or in some cases enough features to develop this requisite gap in the assembly. Consequently a number of regions within parts of Canada and the United States require the product be installed over furring strips in order to develop the necessary break. 
     In addition to the need for furring strips, moisture may accumulate behind a backed panel due to a variety of reasons including condensation and rain. The accumulation of moisture behind a backed panel may eventually lead to numerous problems. For instance, prolonged exposure to moisture may cause damage to the backed panel including, but not limited to, delamination, deterioration, oil canning, and other types of moisture damage. Additionally, the accumulation of moisture may lead to the growth of mold, mildew, fungi, and other types of growth on the underlying structure and the backed panel. The moisture may even cause other types of damage to the underlying structure such as rotting, deterioration, and other types of moisture damage. 
     Exemplary embodiments may satisfy some or all of the aforementioned needs. For instance, exemplary embodiments may provide a drainage pathway, which may be comprised of at least one channel or groove, for a liquid on a surface of a backing portion of a paneling unit. In one example, a backing portion may include a plurality of drainage grooves or channels that may enable a liquid to drain. Optionally, at least one connector groove or channel may be provided that may intersect at least two drainage grooves or channels. As a result, an exemplary embodiment may optionally provide alternative drainage pathways in a system of connected drainage grooves or channels and connector grooves or channels. 
     Another exemplary embodiment of the present invention may include at least one rib. A rib may be included with or without at least one groove or channel. For example, a rib may be adjacent to a drainage groove or between adjacent drainage grooves. A rib may assist with liquid drainage. In addition, a rib may also enable ventilation behind the backing portion. Improved ventilation may help to prevent damage to the backing portion or an overall paneling unit. In addition, improved ventilation may help to prevent damage to an underlying structure such as may be caused by moisture. Furthermore, the ribs with or without drainage grooves may allow for water ventilation. Also, exemplary embodiments of vinyl siding panels may not require the use of furring strips to provide the requisite capillary break between current panels. 
     In particular, exemplary embodiments of composite siding panel assemblies may preclude the use of furring strips when installing vinyl siding or other suitable products because the ribs (i.e. standoffs) integrated with the backing portion may provide a gap between a base wall sheathing and a decorative cladding. This eliminates a major step in new construction vinyl siding installation and reduces labor content, installation time, and raw material costs, which are significantly higher if the contractor must use furring strips. Also, exemplary embodiments may be less prone to deflection given the ribs can be positioned as required to optimize the product. Exemplary embodiments may also fit into a standard accessory pocket, which is available to installers today, precluding the need to develop additional accessories to support this product. 
     In addition to the novel features and advantages mentioned above, other features and advantages of the present invention will be readily apparent from the following descriptions of the drawings and exemplary embodiments. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a side elevation view of an assembly including a first exemplary embodiment of a backed siding unit that may be modified according to exemplary embodiments of the present invention. 
         FIG. 2  is a side elevation view of the siding unit shown in  FIG. 1 . 
         FIG. 3  is a side elevation view of an assembly including a second exemplary embodiment of a siding unit that may be modified according to exemplary embodiments of the present invention. 
         FIG. 4  is a side elevation view of an assembly including a third exemplary embodiment of a siding unit that may be modified according to exemplary embodiments of the present invention. 
         FIG. 5  is a side elevation view of an exemplary embodiment of a wall panel unit that may be modified according to exemplary embodiments of the present invention. 
         FIG. 6  is a side elevation view of another exemplary embodiment of a wall panel unit that may be modified according to exemplary embodiments of the present invention. 
         FIG. 7  is a side elevation view of an assembly of paneling units of  FIG. 6 . 
         FIG. 8  is a side elevation view of a designated portion of  FIG. 7 . 
         FIG. 9  is a side elevation view of a third exemplary embodiment of a wall panel unit that may be modified according to exemplary embodiments of the present invention. 
         FIG. 10  is a partial side elevation view of an assembly including the paneling units shown in  FIG. 9 . 
         FIG. 11  is a side elevation view of a fourth exemplary embodiment of a wall panel that may be modified according to exemplary embodiments of the present invention. 
         FIG. 12  is a rear elevation view of an exemplary embodiment of a backing panel of a paneling unit of the present invention. 
         FIG. 13  is a side elevation view of a paneling unit (dimensions are provided for the purpose of example only). 
         FIG. 14  is a partial rear elevation view of a paneling unit (dimensions are provided for the purpose of example only). 
         FIG. 15  is a perspective view of a backing panel of a paneling unit with substantially vertically oriented ribs. 
         FIG. 16  is a perspective view of a designated portion of  FIG. 15 . 
         FIG. 17  is another partial rear elevation view of the paneling unit of  FIG. 14  (dimensions are provided for the purpose of example only). 
         FIG. 18  is a partial detail view of V-shaped groove portions of the backing panel of the paneling unit of  FIG. 17  (dimensions are provided for the purpose of example only). 
         FIG. 19  is a detail view of a groove section of a V-shaped groove portion of the backing panel of the paneling unit of  FIG. 17  (dimensions are provided for the purpose of example only). 
         FIG. 20  is a partial rear elevation view of an exemplary backing panel of a paneling unit having examples of shaped ribs and grooves. 
         FIG. 21  is a partial rear elevation view of an exemplary siding panel unit. 
         FIG. 22  is cross-sectional view taken along section  22 - 22  of  FIG. 21  of a partial rear elevation view of an exemplary siding panel unit with a wall or other surface such as when installed. 
     
    
    
     DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENT(S) 
       FIGS. 1 through 11  illustrate exemplary embodiments of a backed paneling unit that may be modified according to exemplary embodiments of the present invention.  FIGS. 1 and 2  show a siding unit  10  with two rows of siding. Nevertheless, it should be understood that a paneling unit of the present invention may be manufactured with any desired number of rows or sections. 
     In  FIGS. 1 and 2 , the siding unit  10  includes backing portion  20  and at least one facing or cover panel or portion  30 . For example, the backing portion  20  may be comprised of a base of either expanded or extruded polystyrene or polyurethane foam. However, it should be recognized that the backing portion  20  may be comprised of any sufficiently rigid material, including, but not limited to, foam, fiberglass, cardboard, other insulation materials, and other similar, suitable, or conventional materials. Any suitable means may be used to obtain the shape of the backing portion  20 . In an exemplary embodiment, the shape of the backing portion  20  may be obtained by molding, extrusion through a predetermined die configuration, and/or by cutting such as with a power saw or other cutting devices. 
     The backing portion  20  may be glued or otherwise laminated or attached to the inside of the cover panel  30 . For example, an adhesive may be used to bond a portion of a backed portion  20  to a portion of the inside of a facing panel  30 . 
     In addition, the facing portion  30  may include an attachment strip  32  (e.g., a nailing strip), a tongue  34 , and a groove  36 . The facing panel  30  of the present invention has a portion  35  that rearwardly extends to attachment strip  32 . The portion  35 , alone or in combination with attachment strip  32 , substantially covers the end or tip of the backing portion  20 . More particularly, the portion  35  wraps around and abuts or is substantially adjacent to the end or tip of the backing portion  20 . As a result, the portion  35  protects the end or tip of the backing portion  20  from damage, particularly during shipping and installation. In this example, the attachment strip  32  is substantially in the same plane and parallel to an adjacent portion of the rear side of the backing portion  20 . A channel  37  on the bottom portion of the backing portion  20  may be adapted to interlock with, overlap, and/or extend over the nailing strip  32  of the facing panel  30  of a substantially similar siding unit  10 . The nailing strip (also called a nailing hem)  32  may have a plurality of openings for receiving fasteners. Nails or any other suitable mechanical fastening means may be extended through apertures in the nailing strip  32  in order to secure the facing panel  30  to a building structure. As is shown in  FIG. 1 , the tongue  34  is adapted to fit in the groove  36  of another siding panel when installed on a building structure. Likewise, the groove  36  is adapted to receive the tongue  34  of a substantially similar siding panel when installed on a building structure. The tongue-and-groove connection may also be referred to as a hanger section. 
     The top or face portion of the siding unit  10  may have a facing panel  30 , which completely covers the backing portion  20 . A benefit of this feature is that the backing portion  20  is protected from breakage that may occur in shipping, handling, or installation if not substantially covered with a facing panel  30 . 
       FIG. 3  shows an embodiment of a siding unit  40  in which the backing portion  50  extends into the groove  66 . The tongue  64  is adapted to fit into the groove  66  of an adjacent siding unit. The unit also has a nailing hem  62 , which may or may not have an aperture for fastening the siding unit down. A channel  67  on the bottom portion of the backing portion  50  is adapted to interlock with, overlap, and/or cover the nailing strip  62  of the facing panel  60  of a substantially similar siding unit  40 . 
     In  FIGS. 3 through 6 , the facing panels  60 ,  100 ,  140 , and  180 , respectively, have flat top surfaces that are substantially parallel to the structure on which the paneling unit is adapted to be installed. In these examples, the facing panels have regularly space indentures or recessed portions  70 ,  110 ,  150 , and  190 , respectively. 
       FIG. 4  shows an embodiment that may be modified according to exemplary embodiments of the present invention. The siding unit  80  has a backing portion  90  and a facing panel  100 . The facing panel  100  includes an attachment strip or hem  102 , a tongue  104 , and a groove  106 . In this embodiment, the facing panel  100  substantially covers the top end or tip and the bottom end or tip of the backing portion  90 . The tongue  104  extends around and abuts or is substantially adjacent to the top end or tip of the backing portion  90 . Also, the groove  106  wraps around and abuts or is substantially adjacent to the bottom end or tip of the backing portion  90 . A terminal portion of the groove  106  extends away from a channel  107  on the rear side of the bottom portion of the backing portion  90 . The channel  107  may be adapted to interlock with, overlap, and/or extend over the nailing strip  102  of the facing panel  100  of a substantially similar siding unit  80 . The channel  107  may provide a sufficient amount of clearance for the top of a mechanical fastener such as a nail, which may extend through the nailing strip  102  of an adjacent siding unit  80 . 
       FIG. 5  represents an exemplary embodiment of a wall panel unit  120  that may be modified according to exemplary embodiments of the present invention. The paneling unit  120  has a backing portion  130  and a facing panel  140 . The facing panel  140  includes an attachment strip or hem  142 , a tongue  144 , and a groove  146 . This embodiment of the facing panel  140  also substantially covers the top end or tip and the bottom end or tip of the backing portion  130 . In this example, the tongue  144  extends around and abuts or is substantially adjacent to the bottom end or tip of the backing portion  130 , and the groove  146  wraps around and abuts or is substantially adjacent to the top end or tip of the backing portion  130 . A terminal portion of the facing panel  140  may extend around the bottom end or tip of the backing portion  130  and into a channel on the rear side of the bottom portion of the backing portion  130 . The channel may be adapted to interlock with, overlap, and/or extend over the nailing strip  142  of the facing panel  140  of a substantially similar paneling unit  120 . The channel may provide a sufficient amount of clearance for the top of a mechanical fastener such as a nail, which may extend through the nailing strip  142  of an adjacent paneling unit  120 . 
       FIG. 6  shows an embodiment of a paneling unit  160  that may be modified according to exemplary embodiments of the present invention. The paneling unit  160  has a backing portion  170  and a facing panel  180 . The facing panel  180  includes an attachment strip or hem  182 , a groove  184 , a tongue  185 , and another tongue  186 . This is another embodiment in which the facing panel  180  substantially covers the top end or tip and the bottom end or tip of the backing portion  170 . In this example, the groove  184  is formed between the nailing strip  182  and the tongue  185 . Both the groove  184  and the tongue  185  abut or are substantially adjacent to the top end or tip of the backing portion  170 . On the other hand, the tongue  186  extends around and abuts or is substantially adjacent to the bottom end or tip of the backing portion  170 . As shown in the example, a channel may be formed on the rear side of the bottom portion of the backing portion  170 . The channel may be adapted to interlock with, overlap, and/or extend over the nailing strip  182  of the facing panel  180  of a substantially similar paneling unit  160 . The channel may provide a sufficient amount of clearance for the top of a mechanical fastener such as a nail, which may extend through the nailing strip  182  of an adjacent paneling unit  160 . Optionally, the facing panel  180  may extend around the bottom end or tip of the backing portion  130  and into the channel. 
     The paneling unit of  FIG. 6  is adapted to be connected to adjacent, substantially similar paneling units as shown in  FIG. 7 . A designated portion of  FIG. 7  is shown in  FIG. 8 . The tongue  186  of one paneling unit is situated in the groove  184  of an adjacent paneling unit. A fastener  183  is shown in an aperture of the nailing strip or hem  182 . 
       FIGS. 9 through 11  illustrate some other embodiments of paneling units that may include some or all of the aforementioned features and may be similarly modified.  FIG. 9  shows a wall panel unit  200  that is comprised of a facing panel  210  and a backing portion  220 .  FIG. 10  shows a fastener  230  connecting adjacent paneling units  200  together. A wall panel unit  240  comprising a facing panel  250  is shown in  FIG. 11 . It should be recognized that the wall panel unit  240  may include a backing portion. 
       FIGS. 12 through 22  show other exemplary embodiments of a paneling unit. Such as shown in  FIG. 13 , a paneling unit of the present invention may be installed such that it is approximately or generally vertical. Nevertheless, it is not intended to limit the present invention to the orientation of the paneling unit when installed, unless expressly claimed otherwise. 
     As may be observed in at least  FIGS. 12, 14, and 15 , backing portion  410  of paneling unit  400  may optionally be comprised of a bottom portion defining a channel  420 . Backing portion  410  may also include at least one drainage groove  430  on a surface  452 . In addition, backing portion  410  may optionally comprise at least one connector groove (not shown) on surface  452 . 
     A drainage groove  430  may have any suitable orientation that enables it to provide a drainage pathway for a liquid. Such as shown in this exemplary embodiment, drainage grooves  430  may be angled downward to provide a drainage pathway for a liquid such as water (e.g., an accumulation of water such as may be produced from condensation or rain). An angled orientation may facilitate the collection of liquid in the drainage grooves  430 . In particular, as shown in  FIGS. 12 and 14 , an exemplary embodiment of a paneling unit of the present invention may have a plurality of drainage grooves  430  oriented at an angle of approximately 30° from vertical (i.e., about 60° from horizontal) with respect to the longitudinal length of the drainage groove  430 . However, in other embodiments, the one or more drainage grooves may be oriented approximately vertical, as depicted in at least  FIGS. 15 and 20 , or at any other desired angle from vertical, as desired. In addition, drainage grooves  430  may be spaced about every 1-10 inches in examples. More preferably, in some examples, the drainage grooves  430  may be spaced about every 1.5 to 5 inches. Alternatively, drainage grooves of other embodiments may be placed at other angles and/or spaced at other distances on the surface of the backing portion. Exemplary embodiments may have drainage grooves on the surface of the backing portion in any generally downward trend so as to facilitate the drainage of liquid. Other alternative embodiments may use drainage grooves that intersect other drainage grooves. In addition, alternative embodiments may use other patterns of drainage grooves, which may not necessarily be defined by straight lines, to facilitate the drainage of liquid. In this example, drainage grooves  430  may not extend into optional channel  420 . However, in other exemplary embodiments of the present invention, a drainage groove may extend to the bottom edge of a backing portion (e.g., through the optional channel). 
     In exemplary embodiments, the drainage grooves  430  may vary in shape. In particular, as shown in  FIGS. 12 and 14 , the first two drainage grooves  430  at the ends (i.e., the side edges) of backing portion  410  may have a depth of only about 0.0625 inch, whereas the remaining drainage grooves  430  may have a depth of about 0.09375 inch. As shown in  FIG. 19 , a drainage groove  430  may have a width of about 0.1875 inch and a radius curvature of about 0.1016 inch. Nevertheless, it should again be recognized that drainage grooves  430  may have any suitable dimensions, spacing, shape, and pattern for facilitating the drainage of a liquid. For example, a groove may have any cross-sectional shape along the length thereof, such as but not limited to, straight, diamond, circle, sphere, square, cube, rectangle, oval, ellipse, triangle, cone, cylinder, parallelogram, curve and any other polygon. Any number of grooves may be used. The shape and dimensions of a groove may vary as needed. In an exemplary embodiment of the present invention, a groove may not be placed deep enough to penetrate through the entire backing portion of a paneling unit. Instead, the grooves of the present invention may be sized, shaped, and placed so as to adequately allow a liquid to drain from the surface of the backing portion of the paneling unit. In some examples, the depth of the drainage groove  430  may be approximately 5% to 95% of the thickness of the backing portion from a primary rear surface  452  to the closest point of the facing panel. As a result of the depth of an exemplary groove, it should also be apparent that a gap may be formed between an exemplary backing portion and an underlying structure when installed, which may also facilitate air flow. 
     In this exemplary embodiment, at least one drainage groove  430  may extend through channel  420 . In particular, such drainage grooves  430  include a V-shaped groove portion  432 . V-shaped groove portion  432  may facilitate drainage by providing alternate drainage pathways. In particular, a V-shaped groove portion  432  may approximately form a 60° angle in this example as shown in  FIG. 17 , wherein the respective centers of the groove sections of a V-shaped portion  432  may be about 1.264 inches apart as shown in  FIG. 18 . In this exemplary embodiment, a groove section of a V-shaped portion  432  of drainage groove  430  may have a depth of about 0.0625 inch, a width of about 0.1875 inch, and a radius curvature of about 0.1016 inch as shown in  FIG. 19 . Nevertheless, a drainage groove  430  may have any suitable dimensions, spacing, shape, and pattern for extending into and/or through channel  420 . 
     In examples, optionally at least one connector groove (not shown) may intersect at least one drainage groove  430  on a surface of a backing portion of a paneling unit. Other variations are possible and considered within the scope of the present invention. Generally, the relationship between at least one drainage groove  430  and at least one connector groove on a surface of a backing portion may be that the grooves may be hydraulically connected. In other words, as may be noted from the position of the optional connector grooves, the intersection of connector grooves with drainage grooves  430  may provide alternate pathways for a liquid to drain. As a result, if a particular drainage groove  430  is plugged or obstructed, excess liquid may be diverted to drain through another drainage groove  430  by its transfer via an intersecting connector groove. In some examples, a connector groove may be generally horizontal. However, other suitable orientations of a connector groove are possible and considered within the scope of the present invention. Alternative embodiments of the present invention allow for connector grooves to be generally oriented in any suitable direction. 
     Backing portion  410  may include at least one rib  450 . In this example, a rib  450  may extend adjacent to a drainage groove  430  or between adjacent drainage grooves  430 . More particularly, a rib  450  in this exemplary embodiment may extend substantially parallel to at least one drainage groove  430  from a top edge of backing portion  410  down to channel  420 . In other words, a rib  450  may extend at an angle of approximately 60° from horizontal in this example. However, in other embodiments, the one or more ribs  450  may be oriented approximately vertical, as depicted in at least  FIGS. 15 and 20 . In an exemplary embodiment, a vertical arrangement may promote an even or consistent touch or appearance of the associated exterior panel. In other exemplary embodiments of the present invention, a rib may not be substantially parallel to a drainage groove, and a rib may extend at any other suitable angle. In addition, a rib may also extend to a bottom edge of a backing portion (e.g., through a channel), and a rib may start below a top edge of a backing portion. It should also be recognized that a rib may extend only a limited distance over a portion of a backing portion in other exemplary embodiments of the present invention. In addition, multiple ribs may be generally aligned or otherwise situated adjacent to each other in some exemplary embodiments of the present invention. 
     An exemplary embodiment of a rib  450  may be adapted to facilitate ventilation between backing portion  410  and an underlying structure (e.g., building sheathing). In addition, a rib  450  may also facilitate drainage of a liquid. By improving ventilation and/or drainage, a rib  450  may help to lessen or prevent damage to paneling unit  410  or an underlying structure, which may be caused by the accumulation of moisture. For instance, prolonged exposure to moisture may cause problems including, but not limited to, delamination, deterioration, oil canning, rotting, and other types of moisture damage. In addition, a rib  450  may help to lessen or prevent the growth of mold, mildew, fungi, or other types of moisture-related growth. 
     Furthermore, the rib  450  may be of a size and/or dimension to facilitate the application of exemplary siding panels without the use of furring strips, as previously required by known siding panels. In particular, exemplary embodiments that utilize one or more ribs  450  may preclude the use of furring strips when installing vinyl siding or other suitable products because the ribs integrated with the backing portion may provide a gap between a base wall sheathing and a decorative cladding. This eliminates a major step in new construction vinyl siding or similar material installation and reduces labor content, installation time, and raw material costs, which are significantly higher if the contractor must use furring strips. Also, exemplary embodiments may be less prone to deflection given the ribs can be positioned as required to optimize the product. Exemplary embodiments may also fit into a standard accessory pocket, which is available to installers today, precluding the need to develop additional accessories to support this product. 
     A rib  450  may have any suitable structure for facilitating ventilation between backing portion  410  and an underlying structure. In this example, a rib  450  is elevated from a primary rear surface  452  of backing portion  410  in which a drainage groove  430  may be formed. In other exemplary embodiments of the present invention, at least one rib may be elevated from a primary rear surface of a backing portion, which has no drainage grooves. Ribs  450  may be spaced about every 1.5 to 16 inches or any other suitable spacing in exemplary embodiments. In exemplary embodiments such as the panel depicted in  FIG. 16 , there may be a gap approximately 1 to 3 inches between the flanking sides of adjacent ribs, depending upon the desired gaps useful for air or fluid flow between the backing portion and a wall or other surface. A rib  450  may be situated about 0.5 to 1.5 inches from the center of a drainage groove  430  in this exemplary embodiment. In addition, a rib  450  may have a width of about between 0.5 to 2 inches and a depth of about 0.25 to 2 inches (e.g., 0.75 inch) in one example. In some examples, the depth of the rib  450  may be approximately 25% to 300% of the thickness of the backing portion from a primary rear surface  452  to the closest point of the facing panel. Furthermore, the one or more ribs  450  may include a sloping portion  454  located at either the top and/or bottom ends of the ribs to facilitate the application of the vinyl siding panels with a wall or other surface. The sloping portion  454  may be of a substantially continuous slope or of a changing slope that approximates a curve. Nevertheless, it should be recognized that rib(s)  450  may have any suitable dimensions, spacing, shape, and pattern for facilitating ventilation (i.e., providing an air gap) between backing portion  410  and an underlying structure. For example, unless otherwise specified, a rib may have any size and cross-sectional shape along the length thereof, such as but not limited to, straight, diamond, circle, sphere, square, cube, rectangle, oval, ellipse, triangle, cone, cylinder, parallelogram, curve, and any other polygon. Any number of ribs may be used, and each rib may have the same or different shape. Unless otherwise specified, ribs may be spaced at any distance and in any pattern. 
     An exemplary backing portion may also include a hydrophobic material. For example, a hydrophobic material may be molded into a backing portion and/or sprayed onto a backing portion. Any other suitable method (e.g. extrusion) may also be used for including a hydrophobic material in a backing portion. A hydrophobic material may be any hydrophobic material such as but not limited to, a paraffin wax, polyethylene, fluoropolymer, or any other low surface tension material. As a result, a hydrophobic material may lower the surface tension of a backing portion. Lower surface tension may cause water to bead up and drain down a backing portion faster than if the backing material did not have the hydrophobic material. 
       FIGS. 21 and 22  depict the application of an exemplary siding panel with a wall or other surface  500  as it would when installed in the standard application. As seen, the ribs  450  engage a portion of the  500  to create a gap  502  therebetween to facilitate the movement and/or removal of air, moisture and/or other fluids. The gap  502  is formed due to the primary rear surface  452  (and optionally drainage grooves  430 ) being set back from the rib  450 . The gaps developed by the standoffs in the backing portion could vary based on the size and orientation of the rib and drainage groove geometry. 
     Other variations of the exemplary embodiments of the present invention are also possible. Optionally, an exemplary embodiment of the present invention may provide for an orientation of the grooves or channels on the surface of a backing portion such that grooves or channels of adjacent, substantially similar paneling units may be aligned when installed to form a continuous drainage groove or channels between adjacent units. In this manner, liquid may drain from the surfaces of the backing portions of the installed paneling units through an interconnected system of substantially continuous drainage grooves or channels. Additionally, an exemplary embodiment of the present invention may optionally provide for at least one connector groove or channel on a surface of a backing portion of a paneling unit to form at least a segment of a substantially continuous connector groove or channel with an adjacent, substantially similar paneling unit when installed. As discussed above, the optional substantially continuous grooves or channels between adjacent panels may further facilitate the drainage of liquid from the surfaces of the backing portions of installed paneling units. 
     One exemplary embodiment of the present invention may provide a siding unit, which is comprised of a backing panel and a facing panel. Other types of paneling units comprising a facing panel and a backing panel (e.g., a wall panel unit) are considered to be within the scope of the present invention. Some advantages of a backed panel of the present invention may include improved energy efficiency, reduced air infiltration, reduced curvature in the facing panels, increased ease of installation, improved drainage, improved ventilation, and/or decreased material or installation costs. An exemplary embodiment of a backed paneling unit of the present invention may optionally include improved interlocking pieces and an improved backing. Chemicals may optionally be added to the backing portion that aid in the reduction or repelling of insects such as carpenter ants and termites. 
     The top or face portion of the paneling units may be smooth or may have any number of finishes that are known by those in the art of manufacturing paneling. The finish may add contour and texture to simulate the appearance of wooden paneling. 
     The paneling units of the present invention may be of various lengths, heights, and thicknesses. The particular dimensions of a panel of the present invention may be selected to suit a particular application. Some exemplary embodiments of a paneling unit of the present invention may be approximately 15 to 18 inches in height. However, as just mentioned, it should also be recognized that a paneling unit of the present invention may have any desired dimensions including a height up to or in excess of 50 inches. 
     The exterior paneling units as described herein may be formed from a polymer such as a vinyl material. Other materials such as polypropylene, polyethylene, other plastics and polymers, polymer composites (such as polymer reinforced with fibers or other particles of glass, graphite, wood, flax, other cellulosic materials, or other inorganic or organic materials), metals (such as aluminum or polymer coated metal), or other similar or suitable materials may also be used. The paneling may be molded, extruded, roll-formed from a flat sheet, vacuum formed, or formed by any other suitable manufacturing technique. 
     Any embodiment of the present invention may include any of the optional or preferred features of the other embodiments of the present invention. The exemplary embodiments herein disclosed are not intended to be exhaustive or to unnecessarily limit the scope of the invention. The exemplary embodiments were chosen and described in order to explain the principles of the present invention so that others skilled in the art may practice the invention. Having shown and described exemplary embodiments of the present invention, those skilled in the art will realize that many variations and modifications may be made to affect the described invention. Many of those variations and modifications will provide the same result and fall within the spirit of the claimed invention. It is the intention, therefore, to limit the invention only as indicated by the scope of the claims.