Why Do EPOXY Tables CRACK???
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- Опубліковано 9 лип 2024
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All wood is hydroscopic. Living or dead, it will take on or give up moisture. It exchanges moisture that is in the air. Sealing the wood will slow down the moisture exchange with the atmosphere around it. No sealer is 100% waterproof, especially against water vapor (the water in the air). The wood will want to maintain equilibrium with the relative humidity of the air it resides in. You can make a gage using a piece of wood to show the relative humidity and compare to a gage you buy at a store. The wood wll probably not respond as quickly but it will get there in time.
Different species of wood exchange moisture with the air at different rates but even the slowest will eventually find equilibrium with the air.
Wood exchanges moisture most easily through it's end grain. Pay attention to sealing end grain in the best way possible. Using a paint that has flakes of aluminum creates a pretty good barrier to moisture exchange however its appearance is likely not desired if it is in a visible location. The flakes overlap each other to create a physical barrier to moisture. Multiple coats of this or other sealers help to improve the barrier.
Wood left to dry outside but covered from direct rainfall will achieve a moisture content of 12% - 18%, in a year or more, depending on species and environment. A desert region may yield a lower MC. Wood dried in a kiln will achieve a MC of 4% - 8% in a few days or weeks.
You will want to use kiln dried lumber for use in construction of furniture. If the furniture will be living in a conditioned air space with low relative humidity, problems with movement of the wood will be minimized. If it lives in spaces with higher relative humidity, the wood will move eventually. Wood totally enveloped in epoxy will greatly slow down the movement of moisture.
A good way to determine the MC of the wood that you are working with is to take a sample and weigh it, place the sample in an oven at 350 - 400 degrees F for several hours then weigh the sample again. The weight difference will be the lost water and the percentage of water by weight. You can continue to heat and weigh the sample until no additional loss is measured. You can also use lower oven temps and longer heat cycles if desired but this will absolutely show moisture content. This test can also be used to verify the accuracy of a moisture meter by measuring a sample with the meter then use the heat / weigh method on the sample and compare the results. Take samples from each end of the board to check for variability. Yes this is a destructive test but you can argue that pounding the moisture meter's probes into the wood is destructive as well!
Moisture in the air flows from an area of high MC to an area of low MC and tries to equal itself out.
The moisture content of wood will eventually become equal to the relative humidity of the air in the environment it is in. Period. That is what is happening in a kiln when drying lumber and also what happens when you dry lumber in an open shed outside. The kiln has an atmosphere very low in relative humidity so moisture in the wood will flow to the drier air in the oven. It will eventually equalize with the dry oven air if kept in the oven long enough. The outside open shed has a relative humidity equal to the outside environment which has more moisture than the oven has but less than a freshly cut living tree. The wetter lumber from the fresh cut tree will give up its moisture to the drier air in the shed. The moisture content of the wood will equalize with the moisture content in the air but it will take a considerable amount of time.
Coating the wood will slow the transfer of moisture from air to wood and wood to air. But given enough time, the moisture will equalize.
This is a great video bro. I love the info you put out
Lookin forward to it 🔥
Great video Greg!! Cheers 🍻
what do you do with the mixed resi wood shavings.
nice...thanks for some details
great video Greg
I was wondering if the different thermal coefficients of resin vs. wood make them crack and split too. Resin would most likely expand differently than wood ?
What type of finishes can you put on an epoxy table?
I’m not a fan of epoxy tables like this and admittedly was just watching the video to reinforce that sentiment I suppose, but something he said does make me super grateful for our lumber mills here in the states, though I might not be able to rely on getting good lumber from Home Depot every time I sure as hell can rely on getting good wood from the small mills in the area. Where my family is originally from good wood properly cured was abundant.
Good working brother
I'm making a live edge bench and finishing it with a coat of epoxy, I couldn't find any other videos to help me out with the moisture
good information! When I make an epoxy table I want the moisture percentage below 13%. Unfortunately I don't have such a nice moisture meter that you use. it is true that the pieces of wood are often more moist than the sawmill promises. I use suar wood that dries very quickly by the time it arrives in the Netherlands from indonesia it is already dry.
Hallo BP Resin and steel, ik zie dat je uit Nederland komt heb je ervaring met de tafels die zij maken?
Fantastisk work you are doing. I have a question, how dry must the wood be for doing a epoxi table?
Martin from Sweden
Sorry I saw the video and you answered my question.
All epoxy table will crack and fall apart independent of moisture content. Why? Because even if the wood is “dry” it will expand and contract with seasonal humidity changes. This movement will separate the epoxy from the wood over time, since there are typically no mechanical joints. Well built furniture with proper joinery can last hundreds of years. An epoxy slab table will last a fraction of that at best.
Can I use rosewood to make a epoxy table
Not to sure 🙏🏻
the number 1 reason a epoxy table cracks; wood is warm and alive, epoxy is cold en dead.
think of it.
😄
are epoxy table making god profitable?