EPOXY WOOD ROT REPAIR
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WHAT THIS SITE COVERS:
The sad truth about epoxy and wet rotten wood
How do you treat wood rot?
Step by step DIY repair of a rotten window sill
Log cabin epoxy repair
Using anti-freeze to treat rot
Useful wood rot related links
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Repairing Wood Rot - DIY Window
Epoxy Repair Log Cabins
Wood Rot Repair with epoxy products
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Paul Oman, MS, MBA - Progressive Epoxy Polymers, Inc. (floor epoxies, marine epoxies, underwater epoxies, repair epoxies)
Member: NACE (National Assoc. of Corrosion Engineers), SSPC (Soc. of Protective Coatings)
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Call the vendor of any 'rot' repair product (especially on weekends and after-hours). Will they answer or call back? Can they talk 'rot' or just talk about their product?
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You're talking with: Paul Oman, MS, MBA -- Member since 1994: NACE (National Assoc. of Corrosion Engineers), SSPC (Soc. of Protective Coatings) -- Technical Help - not sales talk!
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There are lots of rot repair pages and epoxy products available. The attempt on this page is to put it all in perspective, outline the general basics and theories, and than (of course), mention the products we sell.
THE SAD TRUTH
Despite claims by many companies, epoxy sealers, penetrating epoxies, etc. will not fix, damp/wet rotted wood. The epoxy may or may not bond to the wet wood (some epoxies bond to wet surfaces) but it will not 'drive the dampness out of the wood' and replace it with hard epoxy. At best the epoxy will stick the the wet rot surface, still leaving the 'water' seemingly 'attached' to the wood.
You will note that penetrating epoxy claims are always done with dry sawdust type rot, the type of surface where any liquid will soak into the material. The material in the epoxy that helps it soak into the fibers is generally a traditional solvent. Some products are actually upwards of 70% solvent and only 30% epoxy (which costs more than solvent). I believe 70% epoxy and 30% solvent is a better ratio.
I have tried several times to epoxy 'fix' spongy, soft rotten wood spots on my outdoor porch deck. I've tried all the tricks, and at best I get a hard crust over the area. Still not satisfied, I've always ended up ripping out the old planking and replacing it with new. And I've also found that the rot on the bottom side of the blank was much more extensive than the patch of soft rot on the top side of the plank and that that the 'penetrating' epoxy never got to more than about 5% of the problem.
Window sills, trim work etc. are a different story. They are small areas and no one is walking on them, so it doesn't really matter too much of the fix is not 100%. The goal often is not so much to completely remove the rot as it is to stabilize the surface so that it will coat a coat of paint. Also porch deck planks are easy to remove and easy to drop a new one in its place. Window sills and outdoor trim are a different matter. Replacing or matching them is often more time, money, or skill than most of us have, so that best we can usually do is just a 'decent' patch.
So, the steps below are the results of personal experience and feedback from customers. There are certainly no right or wrong ways but the method explained below, seems to a good one.
OPTIONAL PRE-TREATMENTS OF ROTTED WOOD
Optional (at this point) - find the rot and remove as much of it as you can.
Option 1) - some people treat the area with glycol (anti-freeze) or boric/acid-salts to kill the fungus spores. (NOTE: This is optional - the epoxy will kill the fungus spores to, but will not 'soak' in as well as the other 'fixes - including 'anti-freeze' see below. There is some concern about bonding to anti-freeze coated surfaces.
In personal tests, I found that anti-freeze penetrated the wood better than anything I have seen (it is attracted to moisture unlike other 'chemicals'). - try it yourself, put a piece of new yellow wood into some anti-freeze and watch the 'stain' migrate through the wood over the next few days. I also found that solvent thinned epoxies stick OK to anti-freeze coated wood and unthinned epoxies will stick decently enough too.
The method is to keep soaking the area with anti-freeze until it will accept no more and then let it 'dry' for as long as possible. This method does have a track record for stopping the rot.
For a third party article on anti-freeze (glycol) use with rotted wood try these links - ( article #1 (treating rotten wood) - (article #2 (more on treating rotted wood) -
Option 2) - treat the area with isopropyl alcohol. The alcohol is a solvent that will 'mix' with the water and evaporates much quicker than water. Thus the evaporating alcohol will carry with it some of the dampness/wetness in the wood. I suppose the alcohol might also kill some of the rot fungus.
Option 3) - cannot say I have tried it, but I suppose heat lamps etc. would help drive out the moisture and water in the rot area. The drier would would add in epoxy penetration. Also, if the wood were reheated just prior to applying the epoxy, the cooling down wood will 'draw in' the epoxy (as the air contracts and cools) deeper into the wood than if the wood were at room temperature. This 'apply to a cooling down surface' is not theory but a well established and proven technique in a number of epoxy application situations.
In A Nutshell - rot repair
1) remove the worst of the rotten wood
2) saturate the wood with a thin epoxy (Low V or ESP 155)
3) fill in the void space with thick epoxy, (Wet Dry 700) blocks of wood, foam, putty etc.
4) sand smooth
5) seal the sanded top surface with more Low V or ESP 155 epoxy)
6) paint the surface
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Spongy Boat Deck Core
|"I used your low-v epoxy to reattach my deck to
it's core deck this year. A lot of the products on the market for
"flooding" a delaminated deck use watery-thin epoxy that is full of
thinners. They cure up gummy, or brittle, they shrink, and they seep
away from voids rather than filling them in. That low-v is thin enough
to flow _everywhere_ without the burden of all those thinners.
My strategy involved small hole-saw holes in a 1-foot polka-dot pattern, large enough to fit a crow-bar to lift up the top laminate a little, and then an array of smaller holes to make sure I had complete coverage. I'd lift a little laminate with the crow bar, pour in the low-v, and after a few minutes it would start pouring out of all the lower holes. I set weights down on the deck to squish it all together tightly after I was content that the entire area had been flooded. It was amazing the little holes that the Low-V would find and start dripping out of from below. I had to be very careful staging my drip-collection in the cabin as a result.
The Low V epoxy is thin enough to flow everywhere, but thick enough to hold a nice film in place to bridge any high spots my weights hadn't eliminated. And no thinners to trap inside the deck.
You've got to start marketing this stuff directly for "flooding" delaminated decks! My decks went from spongy soft to rock solid."
Satisfied Customer 4/16
|Low V epoxy is solvent free, thin and bonds to wet or damp surfaces. Popular for all sorts of ROT repair and for sealing the floors (from chemicals) on Shipping Container sold to the public.|
find the rot and remove as much of it as you can (if you haven't already). Let the wood dry as much as possible.
See pre-treatments above (you can optionally let wood dry naturally, use anti freeze, use alcohol, use heat)
Seal and reinforce the wood with a 'solvent thinned' thin epoxy. Our ESP 155 epoxy is solvent thinned already. Our Low V epoxy is solvent free - you optionally add 0 - 100% solvent to it. Keep repeating this step until no more epoxy will soak into the wood.
Most folks opt for the Low V epoxy and may or may not decide to add solvent to it.
|Order Low V epoxy two part EPOXY Product NOW|
If the chipped out bad area is large, some people recommend carving a wooden plug to fill up most of the space - thus saving epoxy and/or epoxy putty and incorporating more 'real wood' into the repair.
At this point you might fill the rot cavity with the chunk of wood and epoxy putty into place. Whether you use the wood plug or not, time to NEARLY FULL the cavity with epoxy putty. Use our Wet Dry 700 epoxy paste/putty or epoxy cream product. These epoxies will bond to damp surfaces (you can even apply it underwater!). You can also use our non solvent thinned Low V epoxy mentioned in Step 2 and our EZ Thick thickener to make an epoxy paste (approx. 2 parts thickener to 1 part epoxy).
The Wet Dry 700 epoxy is the favorite epoxy putty for all sorts of rot and other repairs. It even bonds to wet surfaces.
|Order Low V epoxy or Wet Dry 700 two part EPOXY Products NOW|
Using an exterior putty (cheaper and easier to sand/smooth - buy from local hardware store) fill the remaining hole. Let harden and sand smooth. It is much easier to sand and shape the non epoxy putty.
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This current page is all about:
Repairing Wood Rot - DIY Window
Wood Rot Repair with epoxy products
"The Wet Dry 700 epoxy paste worked great for patching for the rotted dingy transom. I cut out the rot, fitted new oak pieces, and patched with the Wet Dry 700 epoxy. Easy as pie." -- John 1/15 WET DRY 700 INFO
Using the same epoxy you used in step 2, coat the putty patch and the surrounding wood. This will 'seal' in the putty patch (locking it away from rain, ice and snow) and prime the patch and the window sill (or whatever) for painting.
You can add pigment to the epoxy, which will make it easier (few coats) to topcoat.
Paint the area with a good quality paint (100% acrylic latex or enamel).
YOU ARE NOW DONE!
"WOW! Just completed one coat
of ESP 155, then Epoxy Cream to fair, two more coats of 155. I'm delighted with the finish. I just didn't order
Thanks for great advice." --- M.B. 9/2010 (repair project)
Log Cabin Rot Repair
I get lots of calls (call anytime 603-435-7199) or emails (firstname.lastname@example.org) about rot issues in log structures - mostly log cabin homes.
Like windows you remove most of the rotted wood and replace with chunks of wood, expanding spray foam, or even epoxy mixed with sand (epoxy cement).
The two epoxies used mostly for this repair is our wet dry 700 Kevlar (tm) re-enforced epoxy putty. It bonds to wet or damp surfaces and and will make structural repairs and replace lost wood.
Next you want to use our solvent free (no shrinkage - no fumes - no VOC) - Low V epoxy (stands for low viscosity). This clear (yellows quickly) will bond to dry, damp or wet surfaces. It will form a water proof 'crust' over slightly damp wood surfaces and you can pour it into cracks etc. It will not drive out the trapped water, but it will harden in place.
You can also pre-coat areas with the Low V epoxy - putty fill the spot - and then seal and water proof the putty repair with the Low V epoxy.
When done, you will need to paint over the epoxy repairs.
WET DRY 700 (tm) - kevlar (tm) / feldspar/ceramic industrial grade epoxy paste. Cures underwater or on dry surfaces. If you only kept one epoxy putty repair product on your boat, workshop, or tool box, this would be it. This off-white epoxy (turns yellow over time) can be applied underwater. It has saved sinking boats, leaking swimming pools, repaired rotting window sills, and bonded wood to wood, wood to cement walls etc. Wall mud or cake icing thick. Not be be confused with our thick light blue or white Water Gard 300 epoxy paint which can also be applied underwater (generally pool repairs or marine barrier coats) or our thick, gray, kevlar (tm) reinforced epoxy underwater paint, Corro Coat fc2100A. CLICK HERE FOR MORE INFO on all three of these industrial epoxies.
Jeff (1/2013) I cannot believe how incredible this Wet Dry 700 is. It's revolutionary. The original repair to my storm shelter would have lasted years if the shelter would just stop shifting around in the ground. DON'T STOP SELLING THIS STUFF.
(10/2013) Comments: Returning - Underwater boat repair - My third or fourth order and am still quite pleased with the result. It has many uses above and below the water line.
Chemotherapy for Rot
Once rot gets a toehold in wood it is difficult to cure completely -- it is like a cancer. Digging out the rotted wood will still leave spores and water in the sound wood. After you fill in the cavity with something like epoxy, the rot continues to flourish underneath. Products promoted to make rotted wood sound and stop rot penetrate only until they meet water, with which they do not mix. Under the solid repair rotting goes on. With one exception (more later), the commercial products sold to treat dry wood to prevent rot are completely ineffective against established rot in wet wood because they are dissolved in petroleum solvents and oil and water do not mix.
There are two commonly available inexpensive materials that will kill rot in wood and prevent its recurrence. First, there are borates (borax-boric acid mixtures) which have an established record in preventing rot in new wood and in killing rot organisms and wood-destroying insects in infested wood. Second, there is ethylene glycol, most readily available as auto antifreeze-coolant. Glycol is toxic to the whole spectrum of organisms from staphylococcus bacteria to mammals. All of the published material on its effectiveness against wood-destroying fungi and insects that I am aware of is the result of my investigations over the past 15 years.
Both borate solutions and glycol penetrate dry and wet wood well because they are water-soluble; in fact, penetration by glycol is especially helped by its extreme hygroscopicity -- its strong attraction for water. For both, the fact that they are water-soluble means they are not permanent solutions to rot in wood that is continually exposed to water-below the waterline and in ground-where they will eventually be extracted-dissolved out.
I first was interested in glycol as a wood-stabilizing agent, where it is in many ways superior to polyethylene glycol (PEG), and it was during this work that I realized the useful effect of glycol on organisms, though I was pretty dense in interpreting the first experiment.
The ladies immerse the stems of greenery such as magnolia branches in glycerin to keep them green. Glycol is very similar to glycerin in all its physical properties and much cheaper, so I stuck a magnolia branch in antifreeze. The next day it was brown. After the third attempt I tumbled to the fact that the glycol was killing the greenery. This was the reason that glycol never replaced glycerin in applications such as a humectant for tobacco and an ingredient of cosmetics and pharmaceutical ointments, though it had all the desirable physical properties.
I had two 2" thick slabs of a 14" diameter hickory tree that had just been cut. I treated one with antifreeze and left one untreated. I was looking at wood stabilization, not rot prevention. After about six months stored inside my shop the untreated control was not only cracked apart, but it was sporting a great fungal growth, while the treated slab was clean.
The local history museum wanted to exhibit two "turpentine trees", longleaf pines that had many years ago been gashed to harvest the sap that made everything from turpentine to pine tar. The trees delivered to us after cutting were infested with various beetles and had some fungal growth. I treated them with antifreeze outside under a plastic tarpaulin every few days for three weeks. They were then free of insects and fungus and have remained so after being moved inside and installed in an exhibit over four years ago.
I took three pieces from a rotting dock float that were covered with a heavy growth of fungus, lichens, etc. I treated one with antifreeze painted on with a brush, the second with a water solution containing 23% borates (as B2O3), and left the third untreated as a control. They were left exposed outdoors and were rained on the first night. By the next morning the growth on the antifreeze-treated piece was definitely browning and the borate-treated piece showed slight browning. After two months exposure to the weather the growth was dead on the antifreeze- and borate-treated pieces and flourishing on the control.
I have a simple flat-bottomed skiff built of plywood and white pine, which has little resistance to rot. After ten years some rot developed in one of the frames. It may have begun in the exposed end grain. It consumed the side frame, part of the bottom frame, and part of a seat brace fastened to the side frame. The plywood gusset joining the side frame to the bottom frame was not attacked. I excised the rotted wood, saturated all with ethylene glycol antifreeze to kill all the rot organisms, and there has been no further deterioration in four more years afloat with wet bilges. I have not replaced any pieces, as I am building another boat that can replace it; that is more fun, anyway.
I have a 60+-year old case of the fungus infection known as "athlete's foot". Many years ago it infected the toenails extensively. The whole thing was pretty grotesque. My dermatologist and druggist both assured me there is no known cure. About six years ago I started using antifreeze applied under the nails with a medicine dropper about every five days. The professionals are technically right. I have not completely cured it, but the nails have grown out pink and thinned almost to the ends and I never have any trouble with blistering, peeling, or itching between the toes as I had had for six decades. No drug company is going to have any interest in this because the information has been in the public domain for so long that there is no opportunity for any proprietary advantage. The various wood-rotting organisms cannot be anywhere near as tough.
There are two types of borate products commercially available for treating wood-solid sodium octaborate for making solutions in water (Tim-Bor® and Ship-Bor®) and a 40% solution of sodium octaborate in ethylene glycol (Boracare®). Their equivalents and more concentrated solutions can be easily prepared from borax, boric acid, and antifreeze at much lower cost. Keith Lawrence, editor of Boatbuilder offered to sell me advertising if I wanted to go in the business, but I might run afoul of patents (preparation for individual use is not prohibited), I would have to get EPA registration, and I could not deliver products anywhere near as cheaply as they can be made from raw materials available at your supermarket, drugstore, and discount store.
Glycol by itself has one big advantage over solutions of borates in either water or glycol. Glycol penetrates rapidly through all paint, varnish, and oil finishes (except epoxy and polyurethanes) without lifting or damaging those finishes in any way. You can treat all of the wood of your boat without removing any finish. The dyes in glycol antifreeze are so weak that they do not discolor even white woods. Once bare wood has been treated with glycol or the borate solutions and become dry to the touch it can be finished or glued. IN THE YEARS SINCE I FIRST WROTE THIS ARTICLE, MY EXPERIENCE HAS BEEN THAT GLYCOL BY ITSELF IS GENERALLY THE BEST TREATMENT FOR KILLING ROT. Gougeon's research has shown that borate solutions weaken epoxy joints in the treated wood. If a borate solution leaves white residues on the surface, it will have to be washed off with water and the surface allowed to dry.
If you decide you need to treat with both glycol and borates, this is my preferred process to treat rot. Once you find soft wood or other evidence of rot, soak it with antifreeze even if you cannot do anything else at the moment. Paint it on or spray it on with a coarse spray. Avoid fine mistlike spraying because it increases the likelihood that you will breathe in unhealthy amounts of glycol. Put it on surfaces well away from the really damaged wood, too. Use glycol lavishly on the suspect wood, which will readily absorb 10-20% of its weight of antifreeze.
Next dig out wood that is rotted enough to be weak. Add more glycol to wet the exposed wood thoroughly. Then add the 25% borate solution of the recipe below so long as it will soak in in no more than 2-3 hours. Then fill in the void with epoxy putty and/or a piece of sound treated wood as required. The reasons I use borates at all are: 1) it is a belt-and-suspenders approach to a virulent attack, and 2) over a long period glycol will evaporate from the wood; especially, in areas exposed directly to the sun and the high temperatures that result.
If there is any question about water extracting the glycol or the borates, you can retreat periodically with glycol on any surface, painted or bare, and with borate solutions on bare wood.
Glycol's toxicity to humans is low enough that it has to be deliberately ingested (about a half cup for a 150 lb. human); many millions of gallons are used annually with few precautions and without incident. It should not be left where children or pets can get at it, as smaller doses would harm them, and they may be attracted by its reported sweet taste that I have confirmed by accident. The lethal dose of borates is smaller than of glycol, but the bitter taste makes accidental consumption less likely.
BORATE WOOD PRESERVATIVES:
COMMERCIAL AND HOME-BREWED
Tim-Bor®: Solid sodium octaborate; dissolves in water to make approx. a 10% solution containing 6.6% borate (B2O3); about $3/lb. plus shipping.
Ship-Bor®: Same as Tim-Bor®; $19.95/lb. plus $2 shipping.
Bora-Care®: 40% solution of sodium octaborate in ethylene glycol; 27% borate content; $70/gal. plus shipping.
Home-Brew Water Solution of Borates:
All percentages for this recipe and the others here are percentages by weight. Based on U.S. Navy spec. of 60% borax-40% boric acid (this ratio gives the maximum solubility of borates in water); 65% water, 20 %borax, 15% boric acid; 15.8% borates; borax costs 54 cents/lb. (supermarket), boric acid costs about $4/lb. in drug stores (sometimes boric acid roach poison, 99% boric acid, is cheaper in discount stores); equiv. to Tim-Bor® or Ship-Bor® at 30 cents/lb. To make this solution mix the required quantities and heat until dissolved. The boric acid, in particular, dissolves slowly. This solution is stable (no crystals) overnight in a refrigerator (40°F.), so can be used at temperatures at least as low as 40°F.
Home-Brew Glycol Solution of Borates:
This is equivalent to Bora-Care® diluted with an equal volume of glycol to make it fluid enough to use handily; 50% glycol antifreeze, 28% borax, 22% boric acid. To make a stable solution you mix the ingredients and heat till boiling gently. Boil off water until a candy thermometer shows 260°F. This removes most of the water of crystallization in the borax. This solution is stable at 40°F and has a borate content of 26%. With antifreeze at $6/gal. and borax and boric acid prices as above, this is equivalent to Bora-Care® at about $15/gal.
Products offered by Progressive Epoxy Polymers, Inc.
LOW V™ (thin, solvent free epoxy - add solvent to this to make a penetrating or priming epoxy. Add thickeners to form a paste) - Click Here (low V epoxy)
ESP 155™ (our own clear primer epoxy with approx. 25% solvent - add more solvent for an easy penetrating epoxy) - Click Here (epoxy sealer)
WET DRY 700™ (epoxy paste - bonds to wet surfaces) - Click Here (underwater epoxy)
EPOXY CREAM™ (epoxy paste - bonds to wet surfaces) - Click Here (easy to use epoxy filler putty)
EZ THICK - (thickening powder for epoxies) - Click Here (epoxy thickeners)
EPOXY PIGMENTS - Click Here
OTHER RELATED LINKS ON ROT, EPOXY PRIMERS, ETC.
Penetrating epoxies - www.epoxyproducts.com/penetrating4u.html
Treating rot (this page!) - www.epoxyproducts.com/rot.html
Competitor's penetrating epoxy solvent list - www.epoxyproducts.com/solvents.html
More on epoxy primers - www.epoxyproducts.com/primer.html
Sealing wood (tests) - www.epoxyproducts.com/woodseal.html
|Section One TWO PART MARINE EPOXIES- CLEAR EPOXIES||
Section A EPOXY PAINTS
|Section Two FILLERS THICKENERS ADDITIVES
fumed silica; microsphere/balloons; poly fibers; copper; graphite; Teflon (tm); wood flour; EZ thick; rock flour
|Section Three THICKENED EPOXIES - EPOXY PUTTIES, ETC.
wet/dry 700; splash zone; quick fix 2300, QR 2400 rubber epoxy
Section C THICKENED EPOXIES - EPOXY PUTTIES, ETC.
wet/dry 700; splash zone A-788, quick fix 2300; QR 2400 (tm) rubber epoxy
TWO PART EPOXY PAINTS (barrier coats)
corro coat FC 2100; water gard 300; CM 15; EZ Spray; epoxy primer; crack coat™
Section D CLEAR TWO PART EPOXIES
low V epoxy; basic no blush; ESP 155; Bio-Clear 810
Section Five URETHANES AND NON-EPOXY COATINGS Aluthane (aluminum coating); LPU Marine
Section E NON-EPOXY PAINTS SEALERS
Aluthane moisture cured urethane; Acrylic Poly UV Plus and other 2 part polys ; Capt. Tolley's creeping crack sealer
|Section Six NON-SKID DECK COATINGS
walnut shell; ground white rubber
Section F MIX-IN ADDITIVES
fumed silica; fiber fill; micro balloons/micro-spheres; graphite; Teflon (tm); copper powder; wood flour; EZ thick, rock flour
|Section Seven MARINE REPAIR PRODUCTS
pipe wrap; fiberglass tape (cloth); Capt. Tolley's Creeping Crack Cure
|Section Eight MISC. MARINE PRODUCTS
short nap rollers; TA 661 (solvent free epoxy clean-up); 1 inch foam brushes; 2 inch bristle brushes; tongue depressors
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