Pivot Doors are becoming the most desirable entry door, enhancing the value of high end homes.
The most cost-effective way to make a pivot door is with patented Sing panels. They are fully insulated with urethane, patented Sing core grid makes it stronger than steel pound for pound, and come with a fifty year non-warp warranty with our professional Sing panels. They are also very lightweight, which can save you hundreds in hardware costs alone, as well as save you on shipping costs, labor, and making installation safer. See also: Wide Doors for Hinge or Pivot Door Hardware
Very large extreme edge pivot doors with man door
These are the best true-flat, high precision pivot doors available.
These pivot door panels come standard with frame of 1.5″ wood stiles and 3″ rails, also included 4″ x 12″ wood lock blocks 30” on-center (OC) from bottom.
Standard surface = Luan plywood, upgrade to marine plywood add $100.
You can then lay up whatever skin material you wish: wood stave, steel, stainless steel, FRP or HPL on the surface of Sing pivot door panel or even cut a light opening to satisfy the design of your clients.
The professional Sing pivot door standard panel measures 4 ft x 8 ft x 2.5″ and is untrimmed.
Retail price of pivot doors made with Sing Core pivot door panels often range from $5,000.00 to $10,0000.
Custom oversize pivot doors featuring Sing Core door panels can oftentimes reach $30,000, depending on the skin and finish.
See some of the pivot doors made of patented Sing panel: Pivot Door Gallery
No-fail Pivot Doors
The nature of pivot doors – especially oversized large pivot doors – leads to increased maintenance costs due to warping. When you think of pivot doors warping, you first thought is to think that the door warps along the longest length from top to bottom; it is even more common side to side. Any warp will not only compromise the seal of the door but it will also prevent the door from securing and latching properly. Only Sing pivot doors can be guaranteed not to fail.
Advantages of Professional Sing Pivot Door Panels
ProfessionalSing pivot door panels are the only Eco-friendly lightweight, high strength pivot door blanks that can be guaranteed not to warp or structurally fail for 50 years.
Lightweight Modern Door
Eco-friendly
Made in the USA professional Sing pivot door panels are manufactured using less natural resources (natural wood), recycled rigid foam and formaldehyde-free adhesives. The manufacturing process uses less energy to produce that creates little or no waste.
Lightweight Hardware
The lightweight nature of a professional Sing pivot door blank means saving thousands of dollars in labor, transportation and installation as well as the heavy duty hardware that would be necessary for a heavier door. For instance, a standard 8 ft. door would weigh-in at 720 lbs. compared to lightweight Sing Core’s 120 lbs. reducing the cost of the hardware significantly. In fact, Sing pivot doors are so light, you could use standard hinges, if you wanted to, without fail.
Traditional Pivot Door Panel
Sing Core Professional Panel
Height: 8 ft
Height: 8 ft
720 lbs
120 lbs
High Strength and Non-warp
No other Eco-friendly lightweight pivot door core is so strong nor can compare to Sing Core’s structure strength of 660 PSI. The unique attributes of Sing professional pivot door panels is that they are specially designed with patent pending technology allowing them to be non-warping and structurally guaranteed for 50 years.
Sing Core Patented Torsion Box Panels
We do not sell finished pivot doors, we only supply the Sing pivot door panel for door manufacturers to build the best pivot door.
For overseas transactions there are administrative fees and minimum order restrictions.
Click the picture to see our Sing plywood honeycomb panel gallery!
This Sing honeycomb plywood garbage bin will not warp, bend, twist or rot!
Sing core plywood panelswill not warp, bend, twist or rot. They stay true flat, even when exposed to the elements. The revolutionary patented Sing core technology has solved the warping nightmare. Thus, plywood boxes made with Sing plywood sandwich panels are true flat (non-warping), will stay true flat and can be guaranteedtrue flat for 50 years. It is like Sing panels have true-flat memory!
Our patented Sing panel core is a honeycomb/torsion box foam grid wherein the wood grain is perpendicular to the skin and held together with our patented formaldehyde-free glue. Our patented Sing cores are 90 percent air, which does not move, and are supported by the strongest structure possible. Because there is no movement in the core, the surface material (“skin”) will not delaminate and leak. Therefore, plywood structures made with Sing plywood panels make the best outside structures.
To order Sing plywood panels, please see our pricing page.
Many people struggle with how to fix a warped door. Nothing is more frustrating than spending your hard-earned money on a nice door, only to have it warp, bend, twist or cup not long after installation.
This problem is magnified exponentially especially if the door is a large oversized door. Some of these high-end large doors can cost tens of thousands of dollars only to discover failure due to warp when the season changes. This can mean job security for door repair services, millworks and contractors serving the account, but can lead to dissatisfaction and frustration for the client.
Patented Sing Core
Dealing with how to fix warped wood doors is considered standard maintenance for high-end applications; that was until the invention of patented Sing Core. Only large oversized wood doors made of Sing Core can be guaranteed true flat – and to stay flat – for 50 years. See: No More warped Doors.
Sing Core solves the issues with warping and eliminates the mystery of the warping door. By integrating Sing Core into your door’s composition you can have an elegant, maintenance-free long-lasting door that will not warp, bend, twist or fail regardless of size or application.
Free Door Consultation
The most prestigious clientele around the world seek out expensive door professionals (Certified Door Consultants) to help design doors that meet or exceed the performance standards. We provide free large door consultation to trade professionals to assure that the door that your client receives delivers the high precision performance that they expect.
Click here to see how patented Sing Core door planks/panels/blanks are made providing the only 50 year non-warping guarantee.
Demystifying Door Warping
There is no longer any need to be frightened of doors warping, due to our extensive experience in providing doors (even huge, enormous doors) that are guaranteed not to warp for 50 years to the most proficient building designers, contractors, mill works and high end door manufacturers.
The biggest problem for doors is warping (especially in large doors) used n high-end home building projects and commercial projects when building sliding doors, pivot doors and big interior doors.
Most door manufacturers and millworks avoid building doors over 8 feet tall or offer a very limited one year warranty with many exclusions/restrictions to prevent exposure to damages due to warping. Click here to see
When you buy your door, and even following installation, it may or may not be flat. Most doors begin to shift and move following manufacture. By the time your door arrives at the job site, it may already be warped or beginning to experience separation between the exterior surfaces and the core material.
Certainly after years of regular use (paper core, foam core) will warp and/or delaminate.
No matter what kind of standard core a door is made from, whether paper core, foam core, SLC (Stave lumber core), particleboard, SCLS (Structure composite lumber), LVL (Laminated veneer), mineral core, MDF, cardboard, etc… warping is inevitable. Even a solid wood door will warp. A sliding or pivot door will have unbearable warp at only ¼ inch due to the reference next to a straight wall or door jam. This warping is even worse in a door over 8 feet because of the strength of the movement. So far, the best solutions have been to only make 7-foot high doors, or to make excuses (i.e., no or very limited warrantees) for doors over 8 feet, or to use gaskets to hide the minor warping, but these are temporary solutions that require costly maintenance and replacement and tarnish the reputations of the building trade professionals involved in the projects. As such, most doors usually do not have warranty protection against the inevitable warping. Even with SCLC (Structure composite lumber core) and LVL (Laminated veneer), commonly used in high end large door will not remain true flat due to the wood fiber constantly moving.
Finally, Sing Core provides a guaranteed solution to the challenges of warped doors and it is the only affordable lightweight high strength solution that can provide 50 years of high performance, remaining straight and true without fail. Plus, Sing Core offers insulation qualities that cannot be found in other strong (heavy) building materials. Only this unique patented torsion box/rigid foam composite can offer the superior strength – bridging long spans, or towering heights – while insulating and providing sound deadening benefits.
Sing Core helps door manufacturers and mill workers build doors which satisfy even the most challenging high-end door market. (Click here to see our client list.) Doors made with our patented Sing core panels are true flat and may be guaranteed to stay true flat for 50 years. In addition, our patented Sing Panels (door blanks) are:
1. Dimensionally stable with a high precision tolerance of +/- .006 inch. This is laser precision which produces the smoothest and most true-flat panels.
2. Fully insulated for temperature control and sound-deadening qualities and which are 3 to 5 times more insulated than solid wood-based door cores.
3. Lightweight so that even a 4 inch thick door will weigh only 2 to 3 pounds per square foot. An average wood-core weighs 8 to 10 times more than our patented Sing core.
4. High strength which has been verified by the University of Washington at above 660 PSI, making our Sing panels pound-for-pound stronger than steel. (You could drive a 12,000-pound forklift over them without crushing them!)
5. Water-resistance/waterproof doors made of patented Sing core panels can be completely exposed to the weather without warping. (Click here to see our exterior door gallery.)
6. Eco-friendly and non-toxic structure glue for bonding skins and Sing core.
Click the picture to see our hardwood plan gallery!
Add MDF skin or plywood for paint grade and wood grain.
108 x 34 in. Door
Exposed insulated inner structure
Click here to see how patented Sing core door planks/door panels/door blanks produce true flat stay flat (non-warping) doors in any size, shape or design with a 50-year guarantee. Call us for a free consultation at (360) 495-3577.
Sing plywood panels make garbage bins that do not rot or warp or fall apart!
Add molding to create stile and rail door appearance
Oversize wood grain pivot doorlightweight
lightweight high strength exterior honeycomb sandwich door
lightweight high strength sing honeycomb door
sing honeycomb lightweight sandwich wood sliding door honeycomb lightweight sandwich wood
Ever since people started making doors, especially large doors, they have had to deal with the problem of warping. Door designers and manufactures are still dealing with this scary problem. The problem is so widespread that if customers were more demanding, they would not settle for the AWI standards for warping. Door warp makes doors bend and creates air leaks. If you look at the many frustrated discussions on the Internet about how to deal with door warping, you never see a discussion about the “core” of the problem. Yet, how can you solve the problem if you do not address the cause?
What is the cause?
1. The standard door core is a main cause. No matter what kind of standard core a door is made from, whether paper core, foam core, SLC (Stave lumber core), particleboard, SCLS (Structure composite lumber), LVL (Laminated veneer), mineral core, mdf, cardboard, etc., etc., etc., warping is inevitable. Even a solid wood door will warp. A sliding or pivot door will have unbearable warp at only ¼ inch due to the reference next to a straight wall or door jam. This warping is even worse in a door over 8 feet because of the strength of the movement. So far, the best solutions have been to only make 7-foot high doors, or to make excuses (i.e., no or very limited warrantees) for doors over 8 feet, or to use gaskets to hide the minor warping, but these are temporary solutions that require costly maintenance and replacement and tarnish the reputations of the building trade professionals involved in the projects. As such, most doors usually do not have warranty protection against the inevitable warping. Even with SCLC (Structure composite lumber core) and LVL (Laminated veneer), commonly used in high end large door will not remain true flat due to the wood fiber constantly moving.
2. The skin is a cause because of moisture and/or temperature imbalance on the inside and the outside of a door. For example, an exterior door is up against different climates on both sides of the door and in the interior of the door. This difference in moisture and temperature inside and outside the door moves or warps the surfaces. For example, if one side of a door is up against 12 percent moisture and the other side of the door 7 percent, then the low-moisture side will pull the higher-moisture side of the door to cause warping. Eventually, this constant warping action causes permanent damage and allows drafts and leaks through the door.
3. The inadequate glue between the skin and the core is a cause. Warping also causes surface material (“skin”) such as fiberglass to delaminate between the foam and fiber glass skin, or the door core made of paper or cardboard, or light density foam. Doors usually start out perfectly flat, but eventually impact and weathering separates the door core from the skin, and the door is warped.
4. Weight is a cause. Some door skin, such as lead, cement, minal board, etc., is so heavy that it causes the door to collapse, sometimes even during the moving and installation process.
Yet, the warping problem has been solved! Building designers, contractors and millworkers as well as homeowners can dance for joy.
Patented Sing Core
The revolutionary patented Sing coretechnology has solved the warping nightmare. Doors made with Sing panels are true flat (non-warping) and will stay true flat and can be guaranteedtrue flat for 50 years. It is like Sing panels have true-flat memory! The Sing panel core is a honeycomb/torsion box foam grid wherein the wood grain is perpendicular to the skin and held together with our patented formaldehyde-free glue. So, our patented Sing cores are 90 percent air, which does not move, supported by the strongest structure possible. As such,
High Precision makes true flat Sing cores!
Sing panels are:
1. Dimensionally stable with a high precision Sing core tolerance of +/- .006 inch. This is laser precision which produces the smoothest and most true-flat panels.
2. Fully insulatedin the protection of our patented Sing grid structure for temperature control and sound-deadening qualities. Sing cores are 3 to 5 times more insulated than solid wood-based door cores. Note: Our patented Sing core structure prevents separation of the foam and the skin which preserves the original strength and insulation value.
True flat memory!
3. Lightweightso that even a 4 inch thick door will weigh only 2 to 3 pounds per square foot. An average wood-core weighs 8 to 10 times more than our patented Sing core.
4. High strengthwhich has been verified by the University of Washington at above 660 PSI, making our Sing panels pound-for-pound stronger than steel. (You could drive a 12,000-pound forklift with heavy rubber wheels over them without crushing them!)
5. Water-resistance/waterproof doors made of patented Sing core panels can be completely exposed to the weather without warping. (Click here to see our exterior door gallery.)
Sing core strength!
6. Eco-friendly and non-toxic structure glue for bonding skins and Sing core.
In summary, patented Sing core not only solves the door-warp problem, but also keeps the finished product high precision true flat, lightweight and high strength, plus provides great insulation and sound reduction and is eco-friendly.
Click here to see how patented Sing core door planks/door panels/door blanks produce true flat stay flat (non-warping) doors in any size, shape or design with a 50-year guarantee. Call us for a free consultation at (360) 495-3577.
Door Warp
Door warp is a variation from a plane surface within the door itself. It does not refer to the door in relation to the frame or jamb in which it was hung. Bow, cup, and twist are terms which describe warp in a door and are defined as follows: Bow is a curvature along the door height, or a deviation from a flat plane from end to end. Cup is a curvature across the door width or a deviation from a flat plane from side to side. Twist is a distortion in which one corner is out of the plane of the other three corners. Warp is usually a result of unequal stresses within the door from one face to the other caused by changes in humidity and temperature conditions or uneven conditions from one face to the other. Buildings shall be humidity and temperature controlled before doors are delivered and installed. Required conditions are 25% to 55% relative humidity and 50° to 90° F (10° to 32° C) temperature range. Improper handling, stacking, and storage can also contribute to warp. Doors shall be stored flat on a level surface off the floor with cross supports.
HOW TO MEASURE WARP
Use a taut string or straight-edge and measure on the concave face of door – diagonally, horizontally, or vertically. Measure at the point of maximum distance between the taut string or straight-edge and the face of the door.
Measurement must be made on the concave face of the door. Door shall be open when measuring for warp (lock not latched into strike). One person can measure warp using a string and taping one or both ends onto the face of the door, holding it taut. Don’t measure warp in relationship to the door frame. Often a door may not fit into the frame properly but is not warped. In these cases, check the frame – it must be set plumb and square and jambs must not be twisted or out of alignment. Action on any claim for warp may be deferred for up to one year after project completion to permit doors to acclimate to temperature and humidity conditions.
ALLOWABLE WARP TOLERANCE
FOR WOOD DOORS
1-3/4 inch (44 mm) or thicker doors:
3’-6” x 7’-0” (1050 mm x 2100 mm) or smaller, 1/4 inch (6.4 mm) maximum.
Larger than 3’-6” x 7’-0” (1050 mm x 2100 mm), 1/4 inch (6.4 mm) maximum in any 3’-6” x 7’-0” (1050 mm x 2100 mm) section.
1-3/8 inch (35 mm) doors:
3’-0” x 7’-0” (900 mm x 2100 mm) or smaller, 1/4 inch (6.4 mm) maximum.
Larger sizes not addressed in this standard
Warp-free definition: Doors with patented professional SingCore inside outperform any other Eco-friendly door in the world in terms of being lightweight (SingCore weight is approximately 10 % of solid wood, timber or plywood core) and high strength (660 PSI+, stronger than steel pound-for-pound). No other door Eco-friendly door made in the USA can reach our high precision (SingCore approximately +/- .006 inch) or flatness (far exceeding door industry allowance for door warp, as seen above). We guarantee no other Eco-friendly, lightweight, high-strength insulated door can compare with any door that has patented professional Sing Core inside. SingCore is raising the standard of what is possible in terms of building large doors that can be true flat and warp-free.
