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Cellar Door Access Panels Roof Hatch Doors for Sale

Sorm Doors at Lowes Home ImprovementWhether you’re looking for replacement doors for your cellar door, access panels or roof hatches, you will find that Sing Products build the best insulated doors that are lightweight, high strength, high precision and Eco-friendly.

Materials commonly used when replacing a door of these types of doors include corrugated steel, stainless steel laminate and other metal doors; some may have door kick plates (though these are not necessary because if you kick a Sing door, you will break your leg before you break the door).

Cellar Door

Bilco Lowes Cellar DoorWhether you are replacing an interior or exterior cellar door, an insulated Sing cellar door and/or basement entry doors for basement egress will remain high precision throughout the life of your cellar and can be guaranteed true flat for 50 years.

By far the best material to use in exterior cellar door applications, Sing products are extreme weatherproof, lightweight and high strength while offering increased safety and security.

Sing cellar doors are also used as storm shelter due to their rugged construction and impervious long life guarantee.

Access Panels

lowes access panelAccess panels can be located almost anywhere as an egress point for two adjoining spaces. Access can be vertical, just like any ordinary standard door built into a wall offering access from one room to another, or can be horizontal offering access from spaces that are either above (in the ceiling) or below (in the floor) the access panel’s installation location.

You will find Sing access panels used as bulkhead doors, if you desire the best access panel solutions for your bulkhead door.

Access panels are usually constructed of steel, stainless steel (can be powder coated), diamond plated steel, aluminum, fiberglass FRP or solid wood depending on the architectural specifications and design of the space.

Roof Hatch

VELUX Venting Skylight roof hatch lowesA roof hatch is basically an access panel positioned overhead in the ceiling to gain access to the roof of a building or structure. Due to exposure to the elements and possible extreme weather, Sing products supply an insulated material that is both waterproof and sound deadening.

Roof hatches do not always access the building’s exterior and offer access to the attic; actually an access hatch can be installed between any two spaces offering access above or below. An attic hatch will have a design and construction that could vary from the exterior roof hatch.

Wine Cellar Doors

ReliaBilt Wine Cellar Door at LowesSome of the most exquisite and renowned wineries in the United States specify Sing Core for the architectural design of their wine rooms as both wine room doors and walls.

You will also find Sing products installed in wine cellars in some of the most high-end homes as wind cellar doors, construction of wine room design; so it’s not just for use as wine doors.

Home Security Doors

Insulated Sing home security doors can host a surface material that looks ornate and beautiful as any standard wood door but can actually be a steel plate door or if you desire the exterior surface material could be more obvious, such as a diamond plate door.

Ask for Sing doors, cellar door, access panels, roof hatch at Lowe’s Home Improvement or anywhere you find doors for sale.

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Steel Doors

Applications -> Building Components -> Doors -> Door Links -> Steel Doors

Core Value of Steel Doors
It is how steel door shapes the future by invention of Sing Core.

See: Steel Door Gallery

Steel door technology has not made any major improvements since the development of EPS core which has higher insulation for replacing the paper core and wood based core used previously. Sing Core uses reinforced EPS or urethane foam to fill the voids of the structural torsion-box-like vertical veneer in those highly insulated Sing products, and… Viola! You have the strength which is approximately 30 times stronger than any other regular door made of foam. Steel doors made of patented Sing Core is the leading edge door technology that provides more insulation, strength and extremely lightweight. The end result is more Eco-friendly door; stronger and lighter weight without using heavy gauge steel but creating an even stronger steel door. Click here to see the steel panel regular foam vs. Sing core

Achieve the security, safety and elegance of the most economical, advanced steel door technology to your entryway with Sing Metal Doors made in your choice of high quality stainless steel, galvanized steel or cold rolled steel.


This photo features a fully insulated 13 ft. x 3 ft. x 1 inch steel door with 20 gauge metal under 160 lbs. of load with hardly any deflection. No steel studs, no welding. See pix of steel panels ready for door applications.

Sing Steel Doors are the only insulated Eco-friendly steel doors that can be guaranteed true flat thanks to patented Sing Core’s torsion box/foam composite base material that not only ensures flatness at the time of manufacture but stays flat for centuries.


Honeycomb-Skin-Material-Options-Metal-AluminumYou get it all; Huge savings in heavy weight when compared to solid steel while exceeding standards of high-strength and built-in insulation backed by our limited lifetime guarantee at a fraction of the cost. It’s why we say, “Heavy does not mean strong – and light does not mean weak.” Sing Steel Doors weigh much less than other steel doors and do not require heavy steel reinforcement studs to achieve the high strength. Steel doors made Sing Core do not need expensive, heavy duty hardware required by regular heavy steel doors.

High Strength

Compared to solid steel doors, Sing Core is stronger than steel pound for pound. Patented Sing core could reach 1000 PSI strength vs. paper honeycomb core traditionally used in the steel industry and is changing how steel doors are made. Sing steel doors will not dent or kink like regular hollow core, paper core or foam core steel doors.


Patented Sing Core costs a fraction of high-end honeycomb substrates, like those used in traditional aerospace applications, and still outperforms any of them in lightweight, high-strength, eco-friendly economical solutions bar-none. And that does not even take into consideration the reduction in transportation/installation costs and reduction in maintenance and repair costs over time.

No Welding

no-welding-free-metal-fabrication-lightweight-eco-friendly-stronger-than-steelSing Steel Doors are manufactured without welding which reduces labor costs, environmental and health hazards and our patented method will not compromise the integrity of the steel surface of the steel door, like welding does. No need to compromise the integrity of your steel doors by incorporating the most high precision Sing Core (+/- .006 inch) material and our patented metal fabrication process.

Custom Lite Openings

Sing Steel Doors can come complete with custom lite opening cutouts for adding glass to your door. You are not limited to the type, shape or style of cutout for your glass opening. Other steel door companies offer a variety of window openings to select from. Sing Steel Doors allow you to create any glass enhancement that you can imagine.

Steel Door Replacements

Metal-doorSing Steel Doors are the number one replacement steel doors specified by architects and designers who demand high-quality and longevity backed by our rock-solid limited lifetime warranty. See our Clients List.

Steel Door Hardware

When it is of primary importance to achieve high-end security and stability of a steel door, one invariably runs into the issue of heavy steel doors causing additional strain on the structure and hardware. Patented Sing Core eliminates the heavy weight of solid steel while out-performing solid steel.

Service Industries

Sing Steel Doors are replacing other steel doors used in commercial, healthcare, educational industries as they are being retrofitted in schools, hotels, storm shelters and retail installations.

More Options to Meet Your Specifications

Sing Steel Doors are completely customizable to your specifications. For years the design teams have been working with architects, designers and contractors to solve the problems associated with pre-existing steel door technologies. There is nearly no limit to composite options that can be adapted to the sing Steel Door that will satisfy your requirements.

Variety of Applications

The versatility and customizable attributes of Sing Steel Doors offers almost unlimited applications including (but not limited to) bullet proof, lead lined, extreme weather, tornado, hurricane, fire door, STC rated* and acoustical applications.

Available in Any Size or Configuration

Sing Steel Doors are available to meet your specifications and are not limited to a catalog of available items. Commercial steel doors are the best steel entry doors that are available in any configuration including steel double doors and commercial exterior steel doors.

Fast Turnaround Time

Special rush orders for custom size doors can takes less than one day if we have the materials required in stock.

Eco-friendly Sing Steel

Only Sing Steel Doors are a composite of patented Sing Core embracing our true green technology for a better world and steel which is one of the most recycled materials on our green earth.

Added Security and Benefits

Sing Steel Doors have the added benefits of increased security for vandalism-proofing, protection against windstorm or other acts of god, water proofing, increased fire protection and sanitation.

Substitute Architectural Spec # 08 13 19 Stainless-Steel Doors

Hot Rolled Steel Large Sliding Doors


* Note: STC rating varies according to size, thickness, skin, and other factors. Sing Core does not rate doors, although we are fortunate enough to have one of the best sound testing labs in the world, here in the Pacific Northwest. If you require a specific STC rating, Sing Core can build a door to your architectural specifications and have the resulting door tested at our rating facility for an official rating.


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Flush Wood Doors

The Best Architects and Millworks Choose SingCore for Flush Doors!

flush-wood-doors-open-flush-door-from-interiorAdd simple beauty and elegant appearance of a solid wood flush door to your home without having to sacrifice the qualities of a highly-engineered architectural wood flush door. Sing Core flush wood doors feature natural and composite construction materials that embrace true green manufacturing processes and you can take pride in knowing that your Eco-friendly flush wood door is Made in the USA. Among the many styles of Sing doors, wood flush interior doors offer the visual beauty and refinement of natural wood doors while using high-end composite materials that are used in aeronautics providing the end user a superior lightweight door with impressive attribute at a fraction of the price (see pix). Unlike other flush doors, Sing Core flush wood doors are:

  1. True flat
  2. Solid like a rock
  3. Lightweight
  4. Lock blocks installed on both sides
  5. Pre-insulated
  6. Sound-deadening
  7. Available in any size
  8. Low cost
  9. Guaranteed for up to 50 years
  10. Eco-friendly, true green technology

10×12 ft 3″ thick warp-free 1/8″ oak 520 lbs

The modern look and feel of Sing Core flush wood doors is expanded in practical advancements that let the homeowner enjoy added sound dampening offering peace and quiet features unavailable in other solid wood plank doors for superior sound control between rooms. Sing Core flush wood doors are available in beautiful wood grain finishes or paint grade and our acoustical wood flush doors are found in institutional, commercial, and residential environments for those who prefer high quality architectural wood doors. Some of our standard wood species include:

sing-maple sing-cherry sing-oak sing-vg-fir sing-walnut

Insulated Butcher block door with Sing Honeycomb coreMake your wood flush doors versatile, yet attractive, with your Sing Core architectural door that creates a bold, unique and modern appeal while remaining environmentally sound and come in a variety of wood species, from domestics to rare exotics. Per your specifications, these uniquely designed flush wood doors can be upgraded for acoustical, waterproof, fire-resistant, impact-resistant, even bullet-resistant applications, and are available as interior doors or front entry doors. Sing Core flush wood doors can be found in:

  • homes
  • retail establishments
  • hotels
  • condominiums
  • hospitals
  • municipalities
  • churches
  • restaurants
  • senior living facilities
  • schools
  • offices

Sing Core flush wood doors are resistant to warp, peel or rot and can be guaranteed true flat for up to 50 years.

Unparalleled versatility

Sing Core flush doors are also available in other materials besides wood species, including (but not limited to):

  • Sing-Core-Door-BrochureAluminum
  • Ceramic
  • Concrete
  • Fiberglass / FRP
  • Galvanized steel
  • Glass/mirror
  • HPL
  • Kevlar
  • MDF
  • Plastic
  • Plywood
  • Solid wood stave
  • Stainless steel

Our metal door is highly sought out for high security applications and large oversize doors.

See Sing Core Doors for more options and information.

We can supply flush wood door blanks by the truckload to every major door company that specializes in the prehung exterior door as well as prehung interior doors.

How to build Sing raise panel doors

How to install glass?

How to BuyMetal Composite Sing Core panels are true straight, light and strong.

To order Sing Flush Wood Doors submit an order form either by email,, or print and fax it to: 360.495.4585. We’ll provide a quote within one business day. If you have questions, please contact us.

Easy Ordering

All we need to know is the length, width, thickness and what you desire on the exterior, and your custom specialty panels are made to order. Getting a quote for your specialty product, is easy, thanks to our simple online order system.

Bulk Discounts

If you’re looking for a bargain price, remember, the more you order, the less expensive your total order will be per piece. Quantity and wholesale inquiries are encouraged. Feel free to contact us for more information. Click here for Closeout specials.

Fast turnaround: In you’re in a rush, only Sing Core can be custom made within 24 hours and is proudly manufactured for you in the USA.

Fast delivery: Any thickness and almost any length, less than 5 ft wide, can be made with in 48 hours if it is rush order.

SINGCORE Flush Wood Doors are easy to order. You may choose from our stock panels or order custom sized panels. Our price is based on the length, width, thickness, and quantity. Submit a Work Order by fax or email, and we will give you a quote within one business day. If you have a tight budget, give us a call, we might have an alternative solution tailored to your needs.

Applications -> Building Components -> Doors -> Flush Door
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Door Blanks

Applications -> Building Components -> Doors -> Door Blanks

Yes, Sing Core does specialize in high-end, oversize, custom one-off doors that are fit for a King, adorning palaces and mansions around the world, but we make this technology available to homeowners and commercial applications by teaming up with local door and window manufacturers across the United States. Likely, we have a partner near you.

Door blanksSing Core provides patented standard Sing Core door blanks available to door manufacturers, wood workers, contractors and millworks for use in traditional construction projects. This makes the Sing Core technology available to the masses at affordable pricing, and helps to make and keep jobs in the USA, supporting more local economies, while making the world a better place.

Our local millwork partners can turn a standard-sized door blank into a one-of-a-kind work of art, that is not only beautiful, but let’s you enjoy all the benefits of Sing Core, like:

  • Lightweight
  • Eco-friendly
  • Durable
  • Stronger than steel
  • Insulated
  • Sound-deadening
  • 10 year true flat & structural guarantee
  • Less expensive to install
  • Less stress on hardware
  • Less maintenance

Metal Door BlanksOur wholesale door blanks are supplied to your discriminating door company for use in a wide variety of door applications. Depending on your ideas, limited only by your imagination, you can use this technology in nearly any style of door. Here are some examples of how your local door company might use this technology:

  • Entry doors
  • Bedroom doors
  • Metal doors
  • Pivot doors
  • Glass doors
  • Fire doors
  • Inside doors for homes
  • Dutch doors
  • French doors
  • Pre-hung doors
  • Carriage doors
  • Sliding doors
  • Bifold doors

ready-to-ship-eco-friendly-lightweight-sing-core-panelsAlthough the most popular doors in residential installations includes any wood species available, Sing Core door blanks are also available in almost any other material imaginable, including (but not limited to):

  • Concrete
  • Brick
  • Ceramic
  • Fiberglass
  • Aluminum
  • Stainless steel
  • Fire-resistant Magnesium Oxide (MgO) Board
  • Bullet-proof Kevlar
  • … and so much more

Basically, Sing Core door blanks are available in nearly any standard construction material, making the possibilities limited almost only by your imagination.

Sing Core is constantly on the look-out for better ways to serve the general populace, and aggressively seeking ways to allow others to enjoy the sustainable, eco-friendly benefits of this patented technology.

Please contact us, if you are interested in experiencing this advantage for yourself, and/or your community for a better life for all.