Frequently Asked Questions
Where can I buy Extira panels?
Visit the Where to Buy section for information on where to purchase Extira panels.
What are Extira panels?
- A treated wood composite panel product for non-structural applications for exterior and high moisture interior environments.
- Available in square cut panel dimensions of 49″x 97″, 49″ x 194″ and 25″ x 194″.
- Available in thicknesses of 1/2″, 3/4″, 5/8″, 1″ and 1 1/4″ (+ /- 0.005″).
- Sanded two sides (S2S) for a smooth, unprimed surface.
What are the key benefits of Extira panels?
- Moisture, rot and termite resistant. Treated with zinc borate and manufactured with phenolic resins.
- One piece solid substrate – not laminated.
- No added urea formaldehyde.
- Made using sustainable materials and contributes to industry green building programs.
- 10-year warranty.
For more Extira product information, visit our Features & Benefits page.
What can I make with Extira panels?
- Any non-structural paint grade application for exterior and interior use.
- Extira has been used for exterior millwork such as fluting, rosettes, dentil mould, raised panels; shutters, fenestration (door and window parts); exterior signage; some marine, landscape and nursery applications; underlayment for countertops and many other applications.
How does Extira compare to MDF?
- In internal bucket testing, Extira panels exhibited substantially smaller edge cracks after exposure and air drying than Medex. Call the Extira Help Desk for test details at 1.800.255.0785.
- Caliper swell when saturated in water improves 1-1/2 to 5 times comparing Extira to MR grade and typical MDF.
- JELD-WEN manufactures another product, MiraTEC trim, using the same ingredients and manufacturing technology, which has performed exceptionally well since its introduction in 1998.
How are Extira panels made?
- Wood fiber, phenolic resins, zinc borate and a water repellent are combined to form a thick, fiber mat. Extira is 90% wood. Zinc borate controls the growth of white and brown rot and other wood-destroying organisms. It is an EPA-registered biocide.
- The fiber mat is loaded into a sealed cavity.
- Steam is injected directly into the mat, making heat transfer uniform through the mat. This process is controlled by forced convection.
- Steam escapes the mat evenly from the center to the periphery of the board, improving board properties and allowing thicker board dimensions.
- This process contrasts with the slow, outside-to-inside temperature rise found in conventional MDF-type pressing.
- After cooling, Extira is sanded on both sides with a six-headed sander to reach thickness tolerances of +/-0.005″.
How is MDF made?
- Wood fibers are blended with resins (often urea formaldehyde resins) and formed into a mat.
- No ingredients for moisture, rot or termite resistance are added.
- The mat is pressed between hot platens.
- Heat is transferred from the platens to the mat. This can be a slow process because air becomes trapped in the mat and moisture evaporates during this process. It also takes a long time to transfer heat to the center of the mat. Air and steam escape around the periphery of the mat. The temperature at the surfaces of the mat is greater than the core during the press cycle.
- The properties of the final product are influenced greatly by the final core temperature within the mat.
- Due to this process, the board is not necessarily consistent throughout all points.
What is zinc borate?
Zinc borate is a wood preservative that provides protection from wood destroying organisms for wood composite materials. It is added during the manufacturing process to control the growth of fungi that can lead to rot decay. Zinc borate is a broad-spectrum fungicide with no demonstrated adverse environmental effects (source: EPA Pesticide Fact Sheet).
Are Extira panels green?
Yes, Extira panels are made from sustainable materials. No old growth wood is used in the manufacture of Extira panels. They are made from wood that is of no commercial timber value and is the byproduct of other operations. This leftover wood is also detrimental to the overall vitality of the forest. Extira panels have no added urea formaldehyde. This is certified by Scientific Certifications Systems, certificate number SCS-MC-01802. Extira panels are CARB compliant. They are acknowledged by the California Air Resources Board’s (CARB) Airborne Toxic Control Measure (ATCM) 93120 to utilize exempt status ultra-low emitting formaldehyde (ULEF) resins. Extira panels also contributes to industry programs such as LEED and the National Green Building Standard. For more information, click here.
Do Extira panels contain urea formaldehyde?
Extira panels have no added urea formaldehyde. This is certified by Scientific Certifications Systems, certificate number SCS-MC-01802. Extira panels are CARB compliant. They are acknowledged by the California Air Resources Board’s (CARB) Airborne Toxic Control Measure (ATCM) 93120 to utilize exempt status ultra-low emitting formaldehyde (ULEF) resins.
Why are Extira panels better than wood?
- Extira panels have stable pricing and availability.
- No knots or voids, therefore offering 100% yields.
- Resists checking, splitting and cracking.
- Resists moisture, rot and termites.
How are Extira panels similar to wood?
Extira is 90% wood so it retains some of same attributes. It handles and machines well.
How can Exitra panels be cut?
Fine tooth handsaws or power saws with combination blades work best. JELD-WEN, inc. recommends carbide tipped blades. Cut into the face of the material. Extira can also be mitered for applications such as joints or column posts. Extira can be routed or shaped for a variety of molding patterns and will machine similarly to standard MDF.
How can I fasten Extira panels?
JELD-WEN, inc. recommends traditional fasteners, such as glue and adhesives. We recommend polyurethane-based adhesives. Some general guidelines: 1) Position nails no closer than 1/2 ” from the edge; 2) Drill pilot holes when putting a screw into the edge of the product.This is not necessary when you screw into the face. JELD-WEN, inc. does not recommend nailing into the edge of the product.
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