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Sacred Horizontal Grain Wooden Doors

Designate Sacred Space

12 ft tall horizontal grain walnut door

A wooden door can be used to designate sacred space. By orienting the wood grain horizontally instead of vertically, a clear separation between two differing domains is indicated. For instance, the “world” may exist on the outside of the door, while the inside space on the other side of the door is deemed as separate, protected, or sacred.

Feng Shui enthusiasts are attracted to wooden doors with Sing Core inside as entry doors, for the strongest doors are those which also separate two domains, that of the world from the structure’s interior, in a sense, keeping unwanted energies from intruding upon inhabitants.

This idea of preserving or honoring personal or sacred space is a concept which is fully embraced by inventor Peter Sing and his patented Sing Core technologies. This combination of horizontal oriented wood grain, superior strength, and sound deadening capabilities in a front door adds to the creation of a respectful barrier.

This method of creating separation is powerful and one can find clues to support the preferential dictates of such a door. Buddhist and Japanese barriers known as “kekkai” are low profile horizontal markers which indicate a barrier which should not be trespassed upon, and to do so dishonors those who have set aside the space on the other side of the maker as consecrated.

You might see these honorable markers on the ground, so as not to obstruct the view, such as a horizontally placed length of bamboo, rope, chain, or other material placed in this manner. In Japan, these barriers are more effective than fencing-off an area, without disturbing the symbiotic resonance of the surrounding environment.

The onus is on you to respect such a discreet boundary and to honor it yourself, just as evil spirits may. This horizontal kekkai may also mark an area as “private property.” Alternatively, a stone may be placed in the center of a walkway (this is referred to as a sekimori ishi) or garden path indicating that you are unwelcomed to pass into this particular area.

In some traditions, chopsticks are placed horizontally between the meal and the recipient of the meal as a boundary separating the host (he or she who would partake of the meal) from the sacred gift (the food).

In this way, a horizontal wood grain door with Sing Core inside fully supports these philosophies and are increasingly being found in spiritual applications in temples and other sacred spaces.

An added benefit of using horizontal wood grain on your large entry door, is that it is a responsible use of natural resources, as a very tall door (over 10 ft tall) would require special considerations as very long lengths of natural wood are often difficult to find and might require the sacrifice of an otherwise healthy, growing tree. Plus, as custom door builders know, solid wood will move, warp, and crack, unless the door has Sing Core inside.

16 ft. warp-free horizontal grain teak front entry door

For exterior doors, it is generally advised to use a little more material because wood veneer is too thin to offer much protection, is easily damaged, and may be difficult to repair. While a layer of wood (referred to as wood stave) which is between 1/8th of an inch and 1/4-inch is about perfect for any door with Sing Core inside. You might be surprised to discover that 1/8th-inch wood stave is far more dimensionally stable and looks like solid wood.

Exterior doors made with Sing Core inside are guaranteed not to warp, bend, twist, or otherwise fail for fifty years. No other door can offer such a guarantee, further sustainably honoring you and your sacred space.

3x warp-free horizontal grain hemlock doors 14 ft tall

Horizontal oriented wood grain honors the sacredness of Mother Nature’s gift of wood, maximizing its benefits to the world, while offering a sacred protection adding to safety, security, and peace of mind to you and yours. Elements difficult to find in any ordinary large entry door.

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Wooden Doors

The most popular application for wooden doors is accentuated by their prevalence as interior doors. There are a number of reasons why it is common for wood doors to be used as interior doors, the number one reason is that as exterior doors, wood front doors are less stable due to the nature of wood grain to move resulting in warped doors. But not anymore, thanks to warp-free wooden doors by Sing Core.

The two biggest problems with big wooden doors are the (1) heavy weight and (2) tendency of wood to move due to changes in the environment leading to warped doors. Inventor Peter Sing has introduced to and made available his patented and patent-pending warp-free technologies to all industries. The industry which his technological breakthroughs have had the most impact is on the door and window industry.

Known the world over for his contribution to his warp-free wood and the strongest metal in the world which are both lightweight and Eco-friendly, the biggest and best door companies, millworks, and high end custom wooden door manufacturers are seeking out Sing’s emerging lightweight high strength core solutions to enable them to build doors that were either impractical or impossible to build without inviting a host of complications and problems over time.

Door engineers and contractors who would pass on even considering building large wooden doors would pass on that part of the project due to the exposure of not being able to offer a warranty on a large wooden door that would warp not long after installation.

Sing’s core helps empower purveyors of doors to boldly and confidently embrace the idea of providing large wood doors which Sing backs up with his

50-Year Warp-free Wooden Door Guarantee

This is not a misprint or typographical error. Peter Sing personally guarantees each large oversized wooden door that he helps his clients to build to remain warp-free for 50 years. That is to say that if your door has Sing Core inside, it will not warp, bend, twist, or otherwise fail (including lamination) for a full 50 years.

This is a guarantee which is unheard of amidst the door industry, as most wooden doors are not covered by any guarantee, and for those that are, the standard is 1 year and could include a limited warranty of up to 10 years. There is only one way to build a lightweight large wooden door that will not warp, and to do so you must have Sing Core inside.

How to Build Warp-free Wooden Doors

The secret behind Sing’s ability to build a warp-free door is not as easy as it sounds, as he has a team of warp-free wooden door engineers who he refers to as his True Flat Team which reviews every door, its size and active components such as hardware and surface material, as well as its location within the project or structure, and on the planet earth. The True Flat Team helps to design the perfect substructure to keep the door from warping, so every wooden door is a one-off individual work of art.

1. Hybrid Solid Core

Basically, Sing’s patented hybrid solid core includes a torsion box grid, where the grid size is relatively small, two to three inches, which is constructed of vertical grain wood fiber (many times stronger than standard horizontal grain). Each void of the torsion box is filled with a rigid (recycled) foam insert, and this reinforced grid structure is cold-pressed between two stress skins using formaldehyde-free adhesive. This is Sing’s base material, which is the basis of the core used within his strongest metal in the world.

2. Anti-wood-warp Technologies

Depending on the size of the wooden door, the wood species (and its thickness) hosted on the wood door’s exterior, the application, hardware, and location of the door, additional anti-warp and strengthening material may need to be added to the warp-free substrate to compensate for the additional concerns and challenges. Note that types of door hardware, such as side hinge, pivot hinge, or sliding door hardware, all have different inner configurations, specially designed for each application.

3. Solid Wood Doors

For that “looks like solid wood” effect for which Sing is renowned, solid wood edges matching the natural wood grain featured as the door’s surface material are added to give the appearance of solid wood doors when finished. You can see why doors built with the solid wood edges are featured at the top of the World Trade Center.

4. Apply Surface Natural Wood Grain Material

Sing’s factory has a unique expertise in the area of applying different surface materials to his warp-free substrate though since he supplies his patented products to door companies and millworks, more than half of them ship without door skins, and these are applied at the door company’s factory or in the millwork’s shop. Some will feature solid wood stave planks, others will host various wood veneers.

As is the rule, Sing’s factory does not finish the doors, apply hardware, or pre-hang the doors. This is all done by the companies that make Sing’s door look so magnificent in the field.

What to Expect from Sing’s Wooden Doors

When your wooden door with Sing Core inside is completed and installed you can expect to enjoy all the benefits of owning such a door.

1. Eco-friendly 2. Increased sustainability
3. lightweight 4. High strength
5. Dimensional stability 6. Warp-free technology
7. Sound dampening 8. Increased climate control
9. Save on maintenance cost 10. 50-year no-fail guarantee

You will agree, just as all the other door companies now know,

“There’s no other way to do it.”

Get a free drawing and Price Quote today.


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No More Warped Door

50 Year True Flat Replacement Doors

Copper Door

Copper Door

Building the most stable door is our specialty. With our patented true flat technology, Sing Core provides clients with insulated Eco-friendly lightweight high-strength doors that prevent wood warping doors. Often we are sought out for replacement doors to solve the problem of doors that fail following installation. Doors – especially exterior, large or special purpose doors – are prone to warping, bending, twisting or cupping.

Why Do Doors Warp?

So many things can contribute the failure or the success of your large door’s performance.

  • Size: Length, width, thickness
  • Skin: Some materials are more prone to warp than others
  • Core: The core material will affect the door’s overall performance
  • Environment: Exterior facing direction, weather, exposure to moisture and/or other conditions.

FREE CONSULTATION for your next large door project. You tell our non-warp experts your door’s specifications and expectations and they can provide you with the only non-warp solution guaranteed for 50 years.

What if you started with a Sing door instead of using it as a door replacement?

Only true flat wood front doors by Sing Core can be guaranteed to be flat and stay flat and stay solid for 50 years. Most foam-filled doors might be straight but need patented Sing Core structural grids to keep it strong and tough to avoid failure following impact or due to exposure. Creating a warp-free large door is a challenge for all door manufacturers because it is almost impossible to make a large door that will be straight and stay straight over time. That is, of course, until the invention of Sing Core.

How can you make the most stable door that can be guaranteed true flat for 50 years?

Sing Core has developed true flat technology that consists of three phases.

Sing-panels-lightweight-high-strength-honeycomb-core#1: Sing Core

The first phase is to start with patented Sing Core as the basis of your true flat door. Sing Core is a composite honeycomb material consisting of natural vertical wood grain torsion box where the voids are filled wall-to-wall with solid recycled foam material that is 90% air. The natural wood torsion box inner frame yields only 8% of this natural resource in comparison to a solid wood door. This provides the strongest Eco-friendly, lightweight door core that will not warp, bend or twist.

#2: Skin Selection

Maple-Cherry-Oak-VG-Fir-Walnut-Sing-CoreThe skin selection is matched to your desired appearance of the door. Do you desire a solid wood grain door? If so, what wood species? Besides wood, we can manufacture a Sing door to host any flat building material, including (but not limited to) aluminum, ceramic, concrete, glass, fiberglass (FRP), plastic, LVL, MDF, Mag-board, stainless steel, veneer, even more custom high-end surfaces like, Kevlar, etc…

Reinforced-Structural-Insulated-Panel-vs-Structural-Insulated-Panel-Sing-Core-vs-SIP#3: Performance Enhancement

Next, our true flat experts review the expected performance and usage of your door. Based on how you want your door to perform and under what conditions, our experts may incorporate additional stress skins to bond directly to the Sing Core base to match your desired outcome. How large are the dimensions of your door? Will your door be exposed to the elements? What extreme exposure, if any, will the door face? Will your door be used: Underwater, in temperature-controlled environments, as sound proofing, to prevent harm to persons or property, etc…?

Any Sing composite door can be guaranteed true flat for 50 years, while matching the appearance of:

Framed Stile and Rail Doors

Weatherproof Church Doors

Weatherproof Church Doors

Also called raised panel doors (when in reality it is not raised panel at all. The appearance of “raised panel” is obtained by graduated cutaways that compromises the integrity of the door). These doors are normally made of several different solid wood (or composite) pieces assembled by dowels or other connections.

True Raised Panel Doors

True Raised Panel Doors

The individual components, connectors and adjoining seams tend to move due to moisture, temperature change or with heavy use or vibration over time.

By examining the red door (left) you would never know that this wood Sing door was not stile and rail yet will last for centuries without fail even though exposed to the weather 100%. The appearance of this door perfectly replicates the appearance of the stile and rail doors that were replaced.

Flush Doors and/or Solid Wood Doors

wood-flush-doorSolid wood doors are a romantic and nostalgic nod to days gone by, but solid wood is well known for bending, warping and twisting due to the natural grain of the wood itself.

LVL is a heavy solid core that is more consistent than solid wood in terms of warp, bend and twist when used in wood doors but will often fail (especially in doors over 10 ft. tall) and once it does begin to move, cannot be stopped or straightened as it has no memory.

Foam Core Doors

Foam core doors such as most FRP door, metal door, etc… are lightweight but have no strength or structural integrity.

Almost any impact will compromise the door causing the door to weaken and/or delaminate, unless it incorporates patented Sing Core structure grid technology.

Break a Leg

Only Sing doors can take the abuse without running the risk of breaking or delaminating.

If you kick a door, it is likely to break; kick a Sing door and you will break your leg.

The Sing Secret

Sing-secret-to-lightweight-high-strength-door-technologyThe secret behind Sing Core’s success is not merely in the torsion box design (which has been used for hundreds of years) but in the orientation of the natural wood grain used to form the grids that are the basis of the internal structure for the patented non-warp base material enhanced by stiffening technology to counter-act potential warp.

In the past, torsion boxes were built with horizontal grain, that while running parallel will tend to fail by bending in harmony with the outer wood skin material. Sing Core flips this technology on its edge by contrasting the orientation of the wood grain to be perpendicular to the exterior wood grain resulting in many times the strength.

Previously solid Balsawood core has been used as door core with perpendicular oriented grain successfully but runs the risk of compromise or failure due to its natural characteristics that will also move due to moisture exposure, climate or temperature change. But it doesn’t stop there.

Next, inventor Peter Sing bonded recycled foam (which is a lightweight solid material consisting of mostly – 92% – air) wall-to-wall inside each void of the vertical grain torsion box grids for unsurpassed shear strength and solid core material throughout.

This is how patented Sing Core has accomplished nearly inconceivable strength in the lab (660 PSI, tested by University of Washington as stronger-than-steel pound-for-pound), yet still remaining lightweight.

All this combined with the Sing Composite Formula for specialized stress skin integration results in the only true flat doors that are built to last for centuries.