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How to Measure a Warped Door

How can you tell if you have a warped door or not?

There is an industry standard method of determining whether your door is warped or not.

To determine whether you have a warped door or not you will need a length of string (longer than the length or height of your door) and a measuring stick or tape measure.

a) Tape one end of the string to the edge of the door and the other end to the opposite edge of the door.

The string should be straight. If there is a gap between the string and the door’s surface, you may have a warped door.

b) Measure the gap between the string and the door’s surface area.

If the gap is greater than ¼” your door is warped (according to AWI standards for 1-3/8 to 1-3/4 inch doors 3’-0” to 3′-6″ x 7’-0”).

c) If the length exceeds 7 ft. AWI standard applies to any 7 ft. section. Apply string to any 7 ft. span.

Contact your door maintenance company and send them two photos.

d) [1] Photo of the length of the string which shows as much of the door in its entirety, or at least from one end of the string to the other. Then [2] a closeup photo of your measurement of the gap.

Armed with these two photographs, which can easily be emailed to the millwork or door maintenance company of your choice, the recipients will be able to determine how best to approach the repair or replacement of your warped door.

You might consider replacing your warped door with a professional door which has Sing Core inside which can be guaranteed not to warp, bend twist or otherwise fail so as to avoid this pitfall in the future.

For more information, see: Door Warping vs. True Flat

Storing SingCore Doors

After you’ve received your patented Sing products, if you will have to store them prior to finishing and/or installation, try to store them standing upright, on edge, with plenty of space in between, to allow air flow. Do not lean them against a wall. If you must store them stacked, wrap in plastic and place one or two sheets of plywood underneath and on top of the stack of Sing products. This will help keep the entire stack similarly acclimatized while not in use, otherwise, you may have to re acclimatize the top and/or bottom Sing products later, when you are ready to use them.

 

How to Store SingCore Doors

What if my door with Sing Core inside is warped?

The same standard method of determining and measuring any door with Sing Core inside is used just like any other door (as noted above).

Contact Sing Core about your concerns about your door being certain to include the two photos as noted above.

If you have purchased a professional door with Sing Core inside, you may be the recipient of a replacement Sing door.

Note that upon arrival and un-crating of a door with Sing Core inside, a door may appear warped (and indeed it will be measurable). This is normal for a door which has been packed and in transit. Stand your door on its edge at least twelve inches away from any adjoining surface area, allowing it to acclimatize for up to 72 hours. Measure your door again and you will find it to be straight and true. If not, document for warp (as above) and contact Sing Core.

In the event that a professional door with Sing Core inside is warped (which is highly unlikely) your help in determining the cause of the door’s warping is appreciated. Please assist documenting the chain of custody of your professional door with Sing Core inside, including the millwork or door company which finished the door, and the installers who installed the door, to help us insure your replacement door remains warp-free.

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Architectural Door Specifications

SECTION 08 14 00 – WOOD DOORS

PART 1 – GENERAL

1.1 SUMMARY

  1. Section Includes:
  • Lightweight, high-strength architectural doors utilizing SingCore technology.
  1. Related Sections:
  • Section 06 10 00 – Rough Carpentry: Wood framing.
  • Section 08 71 00 – Door Hardware: Hinges, locks, and accessories.
  • Section 09 91 00 – Painting: Finishing of door surfaces.

1.2 SUBMITTALS

  1. Product Data:
  • Manufacturer’s specifications and installation instructions for SingCore doors.
  1. Shop Drawings:
  • Include door dimensions, core type, face material, edge construction, and hardware preparation.
  1. Warranty:
  • 50 year warranty

1.3 QUALITY ASSURANCE

  1. Manufacturer Qualifications:
  • SingCore patented warp free door slab
  1. Performance Standards:
  • Comply with ANSI/WDMA I.S.1A for architectural wood doors.
  • Meet specified tolerances for flatness, strength, and weight.

1.4 DELIVERY, STORAGE, AND HANDLING

  1. Deliver doors wrapped or crated to protect against damage. B. Store doors in a clean, dry area, lying flat and supported at regular intervals.

1.5 WARRANTY

  1. Manufacturer’s Warranty:
  • Provide a 50-year structural warranty against warping, delamination, or core failure.

PART 2 – PRODUCTS

2.1 MANUFACTURER

  1. Approved Manufacturer:
  • SingCore, Inc.
  • Address:

1134 N Summit Rd.

McCleary, WA 98557

  • Contact-Kate Miller-sales@singcore.com-509-557-0183
  • Website: www.singcore.com

2.2 MATERIALS

  1. Door Core:
  • Patented SingCore core, featuring:
    • High-strength patented core reinforced with rigid torsion box.
    • Insulating foam for thermal and acoustic properties.
    • Lightweight and warp-resistant construction.
  1. Face Material:
  • Options: Depends on final finish (please reach out to SingCore for assistance)
  1. Edge Construction:
  • Solid wood edges or other materials as required to accommodate hardware preparation.
  1. Thickness:
  • Dependent on size and finish

2.3 PERFORMANCE REQUIREMENTS

  1. Strength and Stability:
  • Core compression strength: Minimum 660 PSI.

PART 3 – EXECUTION

3.1 EXAMINATION

  1. Verify that opening dimensions are correct and plumb before door installation.

3.2 INSTALLATION

  1. Install doors in accordance with manufacturer’s instructions and approved shop drawings. B. Fit doors accurately in frames with uniform clearance and alignment. C. Prepare and reinforce doors for hardware as specified.

3.3 FIELD FINISHING

  1. Finish doors in accordance with Section 09 91 00 – Painting. B. Sand surfaces lightly and clean thoroughly before applying finish.

3.4 ADJUSTING AND CLEANING

  1. Adjust hardware for proper function and operation. B. Clean doors using methods recommended by the manufacturer.

 

 

Receiving Instructions and Maintenance

Receiving Your Shipment

Inspect Before the Driver Leaves

  • Photograph and document any visible damage to the crate beforethe driver leaves
    • All damage must be noted on the driver’s copy of the BOLfor insurance purposes
    • Photograph the driver-notated BOL before the driver departs

Failure to document damage at delivery may void freight claims.

Delivery Planning and Unloading

  • If you do not have a dock or forklift, arrange a team for hand unloading in advance
    • The freight carrier will contact you when the crate arrives at the local hub to schedule delivery
    • Be prepared during the scheduled delivery window
    • Delays may result in storage charges from the carrier

Arrival and Storage of Sing Products

Upon Arrival

  • Sing products are delivered unfinished
    • Offloading may require a dock or forklift
    • Additional millwork or door shop work is required before the product is retail-ready

Temporary Appearance of Warp

  • When multiple door blanks are shipped stacked or side by side, exterior pieces may appear warped
    • This is normal and does notindicate a defective product
    • Proper acclimatization will restore the panel to true flat condition

Acclimatization Procedure

  • Stand the door on its long edge
    • Keep it at least 12″ away from walls or other surfaces
    • Allow up to 72 hours for acclimatization
    • Re-measure after acclimatization
    • If the door does not return to true flat, document and contact Sing Core

Proper Storage

  • Store doors vertically at all times
    • Do not lean doors against walls
    • Store in a clean, dry, climate-controlled environment

If doors must be stored stacked
• Wrap in plastic
• Place plywood sheets underneath and on top of the stack
• This helps maintain even acclimatization

Jobsite Conditions

  • Deliver doors only after plaster, concrete, and drywall mud have fully cured
    • Do not store doors in damp basements or uncontrolled environments
    • Moisture exposure will void the warranty
    • Unequal moisture on opposite sides of a panel may cause warping

Fabrication

Safety

  • Wear protective eyewear and a filter mask when cutting
    • Position panels so saw blades enter from the exterior face first to prevent chipping

Blocking and Machining

  • Blocking locations are marked in pencil
    • Re-mark blocking if trimmed or sanded away
    • All drilled holes and cutouts must be filled and sealed with an approved sealer

Failure to seal machined areas may void the warranty.

Finishing Requirements

General Requirements

  • All six sides of the door must be fully sealed
    • Includes top and bottom edges
    • Use a high-quality finish rated for at least 15 years
    • Primer or stain alone is notsufficient

Surface Preparation

  • Sand the entire door surface with fine sandpaper before finishing
    • Remove handling marks and oils

Timing

  • After hardware fitting, apply a sealer or first finish coat promptly
    • The sooner finishing begins after acclimatization, the better the door will perform
    • Complete the finishing process without long interruptions

Finish Quality

  • Variations in gloss, texture, or appearance caused by field finishing are not warrantable
    • Consult your finish supplier for proper techniques
    • Finishing should be performed or overseen by a professional millwork company with at least 5 years of experience

Sun Exposure and Color

  • Avoid dark stains or paints on doors exposed to direct sunlight
    • Black or very dark exterior doors exposed to sunlight are not covered under warranty

Exterior Overhang Requirement

All exterior doors must have a sufficient overhang.

Minimum requirements
• Overhang depth must equal half the distance from the bottom of the door to the underside of the overhang
• Overhang width must extend half of that same distance beyond each side of the door

This protects the door from weather exposure and is required for warranty eligibility.

Warranty-Critical Notes

  • Doors must be protected from excessive heat, dryness, humidity, moisture, and direct sunlight
    • Balanced skins are required to maintain warranty
    • All finishing plans must be discussed with Sing Core in advance
    • Mirrors, tile, or similar applied materials will void the warranty
    • Only skins applied by Sing Square Log Home Inc. are covered
    • Skins thicker than 1/8″ require prior written approval
    • Machining of face grooves, reveals, or decorative cuts voids the warranty

Customers are responsible for notifying Sing Square Log Home Inc. in writing of all finishes and skins applied.

Maintenance

  • Exterior finishes deteriorate over time
    • Inspect exterior doors at least once per year
    • Refinish immediately if deterioration is visible
    • Refinish all six sidesof the door
    • Keep inspection and refinishing records to maintain warranty

 

 

 

 

 

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How to Build a True Flat Wood Door

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

foam-panel-guaranteed-true-flat-lightweight-strong

True flat technology is based on expertise in building any door that can be guaranteed true flat and stay flat. This composite science includes the proper proportions of Sing Core, aluminum and/or other materials and bonding agents based on your requirements or specifications. In this way each Sing door is a work of art.

One of the challenges in building any wood product of any dimension where the customer desires a perfectly flat surface over long spans is insurmountable in many circumstances.

This is the proven niche specialty service provided by Sing Core to the worlds most high-end, demanding, high-profile millworks and end users for years. Due to the unique properties of the patented Sing Core material, true flat designs can come to life and deliver superior satisfaction while carrying a 10 year structural guarantee.

AWI standards may allow for a certain amount of deflection over long spans, the patented Sing Core material far exceeds deflection allowances of other materials, due to its torsion box design while remaining true flat.

This is why the most prestigious millworks in the United States turn to Sing Core for their large, oversize doors, though they have the added benefits of having an end product that is:

  • USA-pre-Bangkok-exportEco-friendly
  • Renewable
  • Dimensionally stable
  • Extremely Strong
  • Light weight
  • Insulated
  • Sound deadening
  • Easy to machine

And could be customized to include:

  • Waterproof
  • Fire retardant
  • Bullet-proof
  • Any Thickness
  • Almost unlimited skin options
  • Fast turnaround

Sing-core-high-in-thailand

The True Flat Challenge

The true flat door is a challenge for architects, door manufacturer, millworks and general contractors, especially if the door is 1 inch thick (or more), over 8 feet wide and/or 16+ feet tall.

If you’re looking for the answer, you might Google search how to build a true flat door.

Oversize doors present the biggest challenge for true flatness, but they also present other issues that must be dealt with in high end homes and/or commercial applications in terms of weight and strength. Again, let’s see what Google has to say about lightweight high strength true flat?

The clear answer is Sing Core; a new invention of material that is playing a major role – not just in building large doors – but almost anything that requires (or desires) to be Eco-friendly, functional yet elegant for inside/outside a home or in building and construction that needs to be light, strong and sustainable

Aluminum composites are common in the aerospace industry, but are cost prohibitive and not user-friendly for mill working or broad earth-bound use. Sing Core is designed to be used in millworks and does not require any specially-trained labor or specialized equipment; treat it just like you would any other standard wood-based substrate material.

Sing Core’s true flat process utilizes vertical grain torsion-box/foam-core/aluminum composites to deliver the solution. Contact us for more information, and if you like, we will show you how to integrate this new technology into your operation.

Meeting the Highest Demands

MoveWallWindowWe maintain the highest degrees of integrity when meeting the requirements of our clients, and their customers, assuring complete satisfaction. Most importantly, proper communication is the key. If you have certain expectations – and you let us know – our team can deliver the product that matches your specifications.

Simply by providing us with your dimensional requirements:

  1. height
  2. width
  3. thickness

along with what your preference for visual presentation (exterior skin material) and performance expectations are, we can provide you with the solution to best suit your application.

How Do We Do It?

When you explain to us what your expectations are, we know how to create the product that meets or exceeds your expectations. For instance, if you require a 17 foot tall oak pivot door that is true flat.

First of all, if the pivot door were solid oak, it would fail the standards test due to the raw material. Natural wood will warp, twist and crack if left to itself. Not to mention being heavy in weight. The excessive weight is an added strain on the integrity of the structure and hardware, increasing maintenance costs over time.

large-lightweight-high-strength-garage-carriage-doorsOur designers will likely prescribe a solution that begins with a Sing Core base material in the center which is by itself perfectly flat. Adding oak wood staves is where the problem comes in; because natural wood is unstable and will compromise the overall structure. To combat this issue, our team may fuse the Sing Core material to aluminum to complete the substrate composite. Then, when the exterior oak faces are applied to the structure; like magic, the result is a lightweight, super strong solution that can be perfectly flat.

The resulting Sing Core lightweight solution does not compromise the structure or the hardware eliminating expensive repairs and/or maintenance.

That’s just one example. Some of the materials used in our true flat composite resolutions that battle the temperature and moisture weaknesses that accompany utilizing natural components (like wood) include

Our lifetime of experience dedicated to solving the challenges of architects, designers and craftsmen who serve the most prestigious clientele, especially in terms of sustainable, lightweight, super strong and true flat solutions that maintain structural integrity over many years, while retaining the beauty and elegance of natural wood (or any other desired external material).

Metal is used across many industries. Metal honeycomb composite is the leader in honeycomb cores used to create stronger and lighter metal panels as well as posts and beams using much less solid metal.

Sing core is the leading technology of metal honeycomb composite material that solves our future Eco-friendly energy solution by using Sing metal honeycomb composite at a fraction of the weight of solid steel, but is stronger, lightweight, and available in steel plate, steel beam and steel panels.

Tell the US Energy Department to do some home work and research the Sing solution. If you believe Sing Core will help us use less metal thanks to Sing honeycomb metal.

Case study #1: Do not waste more precious metal if you could use Sing Metal honeycomb panel, post and beam.

Replace steel by using Sing 13 ft x 3 ft x 1 inch Sing honeycomb metal plate for use in conveyor.

1 Advantage: Precision true flat – within thousands of an inch – the majority of metal fabrication relies heavily on welding that causes the metal to deform. Sing metal uses structural glue, nuts and bolts instead of welding metal plates onto the steel frame which takes more labor, energy and end the product will not match the same precision as Sing Metal honeycomb panels.

2 Easy to fabricate and install – lightweight metal is safer to process, costs less to transport and uses less labor to install.

3 Less cost: Solid metal takes many times more metal than Sing Metal panels, posts and beams. It is expensive to transport, takes more energy to process and the most important thing is that Sing Metal is much less expensive than solid metal planks or sheets. If the strength, lightweight and Eco-friendly attributes are considered you may never go back to solid metal again.

Case study #2: If your seeking to improve your products with greater precision, true flat doors or panels, walls, floors, ceilings, RVs and/or boats then we’d like to teach you to Sing.

True Flat Guarantee premium certified true flatThis is the latest technology to build true flat doors. If we are able to build a true flat door then you can believe that we could make true flat floors, ceilings, walls, etc… all lightweight, high strength, long lasting and endless benefits just by Singing with us.

Doors are a challenge for door manufacturers and mill works if the door is over 8 ft in length and less than in inch thick.

One of the Sing aluminum honeycomb panels are used as door substrate. It used in almost all major high end residential and commercial door applications due to the true flat characteristics. AWI standards for true flat include deflection of ¼ inch, which is unacceptable for Sing Core. We can minimize deflection to 1/8th or even 1/16th according to your pre-arranged specifications and application requirements to ensure satisfaction.

But if you have a door over 12 ft – even over 16 ft tall – and less than 1.5 inch in thickness and you are wishing to have the least deflection than you need to contact www.singcore.com to find the true flat solution which is use aluminum panel as substrate than add MDF or AB plywood for paint grade door or by cold or hot press to add finish veneer to build the most beautiful, strong, lightweight eco friendly door.

Doors made of Sing Aluminum honeycomb substrate do not need to acclimatize due to there being no moisture difference on either side of the door substrate.

Sing Aluminum honeycomb door substrate can be machined or drilled just like wood without retooling or damaging your blades. It is easy to glue with proper clean up procedure.

Large over size doors for high end building project require the true flatness. Patented Sing Core is the ultimate solution for high end mill work across the country.

Please click to see clients list of those who use Sing Core doors.

Applications -> Building Components -> Doors -> True Flat Wood Door