When it is time to put two pieces of pressure treated lumber together, you can choose to work with nails. But this does ruin the appearance of the wood sometimes and if you do not have any nails available, you may need to consider other options. This may bring up the question, can I glue pressure treated lumber?
Can You Glue Pressure Treated Lumber?
Yes, you can glue pressure treated lumber. Traditional glue will not work for this and will quickly fall apart. It is best to use specialty glue that is designed to stick with wood and can even handle damp conditions without falling apart. Polyurethane and Yellow glue are some of the best options.
Let’s take a look at how to use glue on pressure treated lumber as well as some of the different types of glue that will help you put treated lumber together.
Using Glue on Pressure Treated Lumber
It is possible to put glue on pressure treated lumber. You do need to be careful about the type of glue that you want to use. Not all brands or makes of glue will work on treated lumber and if they are not water resistant, it is likely that the glue will just slide right off when the lumber is left or used outside.
You need to pick out a glue that is water resistant and will not come unstuck when it gets a little wet. Since most pressure treated wood will be left outside, such as with outdoor furniture and your deck, it is likely that the wood, and the glue, will get wet. You need to work with a glue that will hold its place under this moisture once it has dried.
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What Type of Glue Works Best For Pressure Treated Wood?
There are several different adhesives that work well for conventional lumber when you look at the market. You need to make sure that you get the right type of glue to handle whatever conditions the wood will be exposed to. The only glue out there that is waterproof and will not fall apart are the resin glue.
Urea resin and polyvinyl resin glues are adhesives that give a bond that will work against water a little bit. There are also some construction glues that are even better and can handle a good deal of moisture that may touch the wood. The temperatures that fall in these types of adhesives are often lower than some other choices.
With all of the options there though, it is hard to know which types of glue to use on pressure treated lumber. The best types include:
1. Polyurethane Glue
- Incredibly Strong: Expands 3 times into the materials to form an incredibly strong bond
- Best for tough repairs on dissimilar surfaces, both indoors and out
- 100% waterproof; Doesn't break down when exposed to outdoor elements
- Versatile; Easily bonds wood, stone, metal, ceramic, foam, glass, concrete and much more
The first option on our list is polyurethane. This is a water-resistant adhesive so it can protect against water and can even do better when the conditions are damp. This is one of the first choices that you should try if you want to do a project with any pressure treated wood at all.
This is because pressure treated wood will often be damp at first and this glue loves to work on damp wood. It also handles porous end grain well so you can glue your project together without issues.
2. Titebond III
- Provide a much stronger bond than the wood itself
- Offer excellent heat-resistance and are very easy to sand
- Water cleanup while still wet
- Provide strong initial tack and a 30-minute clamp time
- Non-toxic and safe to use
This is a good adhesive to use if you want one that is water resistant and is good to sand. It provides you with about ten minutes of open time and will only be water resistant when you dry it. However, you can easily clean it while it is wet if you need. This is one of the best choices to work with for cut boards, outdoor furniture and any location where moisture is around.
This is one of the top glues available to carpenters because it works so well. If you would like to work with some furniture pieces or cabinets, then yellow glue is one of the options that you need to use. It is strong, can handle some moisture, and dries so you will not see it at all.
There are a number of benefits that come with this type of glue. For example, you are able to easily clean it while the glue is still wet. And it happens to become stronger than the wood you glue together once it has a chance to dry well. It is also a good option if you need to sand the piece. Keep in mind that this is not the best option for materials that are damp though.
This is another great option to use on treated lumber. It bonds really fast and you can choose the viscosity that you would like, whether it is jelly thick or watery. The thinner variety is a good option to use as a reinforcement on the wood you have.
If you use the thicker version of this glue, it is often the best when it is time to fill in gaps. Keep in mind that this glue is a little more brittle compared to the other options. You should not use it in areas where the item is used daily or it will break down.
If you plan to use glue on some of the pressure treated wood you have, it is best to choose one of these four options. These will keep the pieces of wood together without them falling apart due to the elements.
What Else Can I Use to Join Pressure Treated Lumber?
While glue is a great way to combine pieces of pressure treated lumber together, there are a few other options that you may want to choose as well. It will all depend on what you hope to accomplish and the amount of security you want with the connection.
Many manufacturers of pressure treated lumber will only use stainless steel on the treated lumber. Other options like connectors, anchors, bolts, screws and nails that are galvanized all work well here too. Since the new wood has been treated and is usually corrosive to aluminum, you may want to work with something like copper or vinyl flashing to keep it safe.