How do you fill large holes in rotted wood?

The best solution to filling a big hole in wood is to fill it with wood filler. The second best solution is to replace the rotted part of the wood with new material.

How do you fill a large hole in rotten wood?

Your best bet is to remove the damaged area, which will allow you to see how deep the rot goes. You can use a hammer and chisel or a pry bar for this.

If it has gotten too far gone, then you may want to consider replacing the entire board instead of trying to repair it.

Once that’s done, apply wood filler with a putty knife overtop of where there was once damage before staining or painting over top.

What to fill big holes with?

You can fill large holes with a variety of materials. The best choice depends on the type of wood, how you want to finish it, and how much strength the hole needs.

  • Epoxy: Epoxy is good for filling large holes in all types of wood without sanding or priming the surface. It’s also waterproof and has a high sheen. However, epoxies are expensive and take 24 hours to cure fully (which means you need to wait before putting anything over them).
  • Wood filler: There are many varieties available from hardware stores and home centers; choose one that’s appropriate for your project based on its color, texture, drying time, etc. Wood filler dries very quickly (usually 15 minutes) which makes it easy to work with but also means any mistakes will show up right away! This material has no adhesive properties so be sure whatever material you use afterward has plenty of adhesion qualities (epoxy works well here). In addition to covering gaps where pieces have separated over time due to rot or water damage—like plywood sheets separating from one another after being exposed too long outdoors—you can also use this product as a sealant between layers when building furniture like bookshelves or cabinets because it’s relatively inexpensive compared with other options such as polyurethane varnish.”

What to use to fill holes in wood?

To fill the holes and gaps, you can either use wood filler, putty, or epoxy. If you’re just making small repairs to some rotten wood, then use wood glue to hold it together until the board dries out completely.

If the damaged area is large and wide, then use caulking material like fiberglass or silicone caulk that has been mixed with a liquid resin-like polyurethane to fill large holes in your deck boards.

This will make sure that moisture doesn’t get inside the hole again because it seals it off completely so water can’t get through any cracks or gaps left behind by old nails/screws that have been removed from your deck flooring surface

How big of a hole can you fill with wood filler?

When it comes to filling holes in rotted wood, the size of your hole is not important. The only thing that matters is how much filler you have available.

If the repair needs to be made quickly, there’s no reason not to use wood filler right away, even if you are able to find new wood to replace what has rotted away.

Wood filler will fill any size hole and expand as it hardens into place—so feel free to go big! If you have enough wood filler on hand (or more importantly—if it’s readily available), then by all means use as much as necessary until your whole project has been repaired.

How big of a gap can you fill with wood filler?

The answer to this question depends on the size of the gap and the type of wood filler you are using.

If you’re working with a large gap, such as a 2-inch hole that has been eaten away by termites, it will be difficult to fill it all at once—especially if your wood is soft and spongy like pine or cedar. However, there are several ways to get around this problem and make sure your repair lasts:

  • You can try applying two coats of wood filler over top of one another in order to fill deeper holes (this method works best when dealing with hardwoods). This will help prevent water from seeping through cracks after they’ve dried.
  • Another option is sealing up any other places where water might flow into your home around windowsills, doorsills, and other areas where water could pool up against walls/doors until entering homes through cracks/gaps between panels/panels themselves (if possible). If moisture gets trapped inside walls/floorboards without being able to escape via ventilation systems then it’ll start eating away at whatever materials remain there!

How do you fix rotten wood without replacing it?

  • You can use a wood filler to repair small holes, cracks, and other damage in the wood. If you don’t want to replace the entire piece of wood, this is probably your best bet.
  • Wood epoxy is another option that works well for repairing large holes in rotted wood. It’s stronger than a wood putty and will hold up well over time, so it’s good if you have a lot of damage or need something strong enough that won’t be prone to breaking down under pressure or being bumped into regularly.
  • Wood putty is also a popular choice for covering small areas where there isn’t much rot but where you might still want some extra protection from bugs or stains getting into those cracks and crevices between boards. This can give them an even finish without having any visible seams after installation–and since these tend not to cost much more than regular putty (about $5-$10), they’re usually worth considering if your budget has room for it!
  • A patch kit allows you to cover larger areas without replacing them all at once; however, because these take longer than other options listed here (#3-6 above) we recommend using this only as a temporary measure until new boards can be installed properly with screws/bolts.

Can I use wood filler on rotted wood?

You can use wood filler on rotted wood. You’ll need to use an exterior-grade filler, however, and be sure to apply it as soon after you discover the damage as possible.

Once you’ve applied your wood putty and sanded it smooth, paint right over top of it with exterior-grade paint.

What is strongest wood filler?

The strongest wood filler is epoxy, which is a two-part mixture of resin and hardener. This type of wood filler is ideal for repairing cracks in wood frames or doors because it will withstand heavy use and take abuse. Polyester resin is also another good option if you’re looking for a high-strength filler that can hold up over time. Polyurethane, acrylic, and polyethylene are types of resins that can be used as fillers, but they’re not as strong or durable as epoxy or polyester resin; these fillers are more expensive than water-based fillers like latex.

If you’re wondering what kind of finish you should put on your repaired piece after filling the holes with epoxy or other resins (or even just using plaster), we recommend using oil paints instead of varnishes so that no moisture remains trapped inside the surface after drying out (which could cause warping).


Before you fill large holes, you need to make sure that the wood is dry and stable. If it still feels soft or has a foul odor, waits until it dries out before filling any large holes.

Once your wood is ready for filling, we recommend using epoxy-based filler paste. These products are easy to use, come in different colors (including clear), and can be used on all types of woods like oak or mahogany.

When applying this type of filler paste into the hole: Use a long putty knife or trowel to mix the two parts together evenly; place a small amount onto an aluminum foil plate (so there won’t be any mess); add more material until the hole is completely filled; smooth over with your finger until even with surrounding areas; let dry overnight before sanding off excess material (this helps avoid clumps).

Photo of author

Martin Flood

Martin Flood has been working in the construction industry for over 20 years as a general contractor with expertise in remodeling projects that are large or small. He has furthered his career by specializing in epoxy resin flooring, providing excellent service to both commercial and residential clients. Martin’s experience enables him to offer professional advice on how to choose the right type of project based on your needs and budget.

Leave a Comment