RF Kiln Drying

Custom Drying

New to Nostalgic Wood’s shop is an RF Kiln Tech radio frequency kiln. We are now offering custom drying for all types of wood not able to be dried in traditional kilns. We focus on drying extra wide (up to 50"), extra long (up to 19'6") and extra thick (3" to 12") pieces.  RF vacuum drying combines wood technology with vacuum, mechanical and thermodynamic technology to create a superior process for drying wood. Suitable for drying both hard and softwoods with a wide range of thicknesses. RF vacuum dryers are the ideal solution when wood needs to be dried at low temperatures to prevent checking or warping.

Examples of what we have successfully dried for clients in our RF Kiln:

12" x 12" x 19'6" beams

6" x 12" x 50" stair treads

4" x 48" x 19' slabs

16" high x 40" diameter stumps (additional fee for excess thickness)

4" x 48" diameter cookies

 

Why Choose and RF Kiln?

An RF kiln has drying capabilities that are unique compared to traditional kilns. Some qualities that set it apart:

  • Able to dry extra long (19’6”), extra wide (50”), and extra thick (3”to 12”) pieces.
  • Can dry thicker pieces than traditional kilns. 
  • Able to dry variety of pieces such as slabs, cookies, crotches, and timbers in the same load.
  • Dry from green to 6-10% in 7-9 days, with less cracking, checking, warping, twisting, etc. than traditional kilns. 
  • From standing tree to dry thick slabs traditionally took about 2 years.  Using an RF Kiln could reduce it down to 1-2 months.
  • RF drying does not rely on air movement throughout the chamber, but relies on full contact between the faces to send radio frequencies through the wood.
  • Gradually brings up the temperature of the wood while applying uniform pressure reduces deformities during the drying process.
  • The radio frequencies sent through the wood causes it to dry more uniformly across the entire thickness and width which reduces the internal stresses that cause checking or cracking.
  • Placing the wood under vacuum lowers the boiling point of water and reduces discolouration.

 

The Ideal Pack

Our kiln consists of four packs that are 236”x50”x12” each. We schedule custom drying by the full kiln load with a minimum of 3000 bd ft.  Receiving four well-built packs ready for drying in the RF kiln will improve the drying results.

The perfect pack:

Live Edge

  • Consists of wood from the same log so there is full contact between the faces.
  • Has minimal spacing between the different logs (fills up the entire pack).
  • Each piece of wood has a full face without deformities such as holes or rotten pockets.
  • Each stack of wood is cut flat and even and cleaned of sawdust between layers.
  • The width of the bottom and top faces does not differ by more than 6”.
  • The pieces of wood are cut uniformly both end-to-end and side-to-side.
  • The pith of each log is either non-existent, or boxed in.
  • Slabs are reversed stacked with stickers/spacers between each slab

Board Stock

  • Boards are stacked such that there is no space in the middle of the pack.
  • Boards may be different lengths, widths, and thicknesses within the pack, but must stack to build a square solid block.
  • Each board is cleaned of all sawdust and dirt.


What to Expect

  • The condition of the wood we receive is directly related to the quality of drying achieved.
  • Ideally, getting wood as green as possible produces the best results because the slab has not had a chance to start movements.
  • Each piece of wood is unique and can be unpredictable, not every piece will dry the same.
  • Each piece of wood has a different equilibrium moisture so some pieces may absorb moisture after the drying process.
  • The most effective drying occurs when there is perfect vertical continuity between the wood (no overlap of the edges).
  • Our vacuum draws the water out through the natural pathways of the wood. The best results occur when the face of the piece is clean (no holes, rotten pockets, cut marks, or sawdust).
  • The natural pathways throughout the wood may have small pockets that tend to trap moisture during the drying process and therefore read at a higher moisture. Overall, this should not affect the quality of the slab.
  • The log moves least when the pith is either boxed in the middle of the slab, or is removed.
  • If there is a projection (such as a branch or stub) that is unsupported on the top and bottom of the stack, there is an increased risk of deformity in that area.
  • Storage of your dried wood is crucial to maintain the integrity of the wood. Ideal storage is at room temperature with a humidity of 35-50%.

 

Scheduling

  • Receiving date of wood depends on volume, lead time and drying needs.
  • Contact us at nostalgickiln@wightman.ca or 519-323-0175 for pricing and to discuss your needs and schedule a timeline for drying.
  • Tentative pickup date will be provided when wood arrives on site.
  • Pickup day will be finalized as drying nears completion.

 

Warranty

Each piece of wood is unique, can be unpredictable and not every piece of wood dries the same. Wood is a natural product with a great variance in grain structure, densities, and other characteristics. We therefore cannot provide a guarantee on the drying of the wood. Should there be any issues or concerns that arise, we retain the right to inspect the products for assessment.

 

A forest shares a history, which each tree remembers even after it has been felled.”   ― Anne Michaels, Fugitive Pieces

Email Us

FOR MORE INFORMATION ABOUT OUR RF KILN DRYING, CONTACT US AT: kiln@nostalgicwood.com 

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