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Contents
Can pressure treated wood be bent?
On a moderate bend as used on the edge of a curved deck moisture content is not critical. The wetter wood will take longer to stabilize, but sometimes this can be done in its permanent position fastened to the joists, etc. On more severe bends hydraulic pressure does have an affect.
How long do you have to soak wood to bend it?
They have to soak the wood in water to bend it and get it into a certain shape. To efficiently make the wood bendable, it’s recommended that you soak the wood in relatively hot water for one to three hours. Many other factors can change this, but one to three hours will work for most wood types.
How do you soften wood for bending?
1. Steaming or soaking the wood in boiling water to soften it. 2. Saw-kerfing or grooving the back of the wood so it will bend easily without danger of splitting or cracking.
Can you bend wood with a heat gun?
Turn on your heat gun to medium-high and hold it about 4-inches from the wood. Setp 3: Keep the wood moving constantly as it can scortch the wood. Test the wood periodically for give. After a few minutes, the wood will become malleable, and you’ll be able to gradually alter its shape as you desire.
Can you bend wood by soaking it in hot water?
To efficiently make the wood bendable, it’s recommended that you soak the wood in relatively hot water for one to three hours. Many other factors can change this, but one to three hours will work for most wood types. This is a good general guideline to follow, but again depending on the type of wood you’re using.
Does water help bend wood?
Another method for bending wood involves soaking it in hot water until it becomes pliable. Once pliable, you’ll be able to clamp it to a form and allow it to dry. When it’s cool and dry, it will take the curved shape of the form.
Can you bend wood without steam?
A very common practice today is laminating wood much the same as plywood is formed. This provides strength and makes the wood very pliable to work with. By taking solid wood and cutting it into thin strips glued together, will give you any curve you want.
What type of wood is best for bending?
The species commonly used in industry for making bent members are: White oak, red oak, elm, hickory, ash, beech, birch, maple, walnut, mahogany, and sweetgum.
Can you use pressure treated wood for framing?
You can use pressure-treated wood for framing. However, pressure-treated lumber costs much more and does include potentially toxic chemicals. Thus, pressure-treated wood is only recommended for outdoor applications and where framing touches the foundation.
Can you build furniture with pressure treated wood?
Yes, you can use pressure treated wood for indoor furniture and indoor projects such as sill plates, for carbon steel fasteners. The only exception is in places where it comes in direct contact with food and water, such as cutting boards and kitchen countertops, and places where pets can chew and ingest the wood.
Can you use pressure treated wood for bed slats?
We get this question a lot. The simple answer is yes, pressure-treated lumber can be used in any interior application except cutting boards and countertops. Some have also asked, after they’ve found pressure-treated lumber installed inside their homes, if there is any danger in having it indoors.
Can I use pressure treated wood for roof rafters?
The 2012 International Building Code® (IBC 2012) and 2012 International Residential Code® (IRC 2012) do not include provisions for the use of preservative-treated wood for roof assembly components such as blocking, nailers and roof deck sheathing or structural members supporting roof assemblies such as joists, rafters …
Bending Pressure-Treated Wood
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- Most searched keywords: Whether you are looking for Bending Pressure-Treated Wood Updating Filenumber5263end BrettAH furniture, machining, creating, custom, design, construction, assembly, planning, joints, details, carpentry, trim, millwork, crown, base, casing, window, door, mouldings KBIndex KBAM KBAMInstaller KBFurniture KBFurnitureOutdoorFurniture KBMISCEL KBBWGeneral 5STAR5 4IMAGEICON4 KBAM KBFurniture KBMISCELDetailed, authoritative information on the ins and outs of bending pressure-treated wood for curved outdoor decks or garden structures. May 23, 2007
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How to Easily Bend Wood || AMAZING Bent Wood lamination – YouTube
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- Most searched keywords: Whether you are looking for How to Easily Bend Wood || AMAZING Bent Wood lamination – YouTube Updating How to easily bend wood with out steam box,and its called bent wood lamination. I will show you everything you need to know about this sliced wood bending t…bend wood lamination, bent lamination glue, bent lamination glue and clamp, bent lamination projects, bent wood lamination, bentwood lamination, doing it with jason, easy bent lamination glue and clamp, glue and clamp lamination, how to bend wood without steam, how to wood bending technique, how to easily bend wood, how to easily bend wood || bent wood lamination, bending wood without steam box, bent lamination, how to make modern furniture, sliced wood bending technique
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LIVE | DIY curved garden edging using treated pine, an affordable landscape solution. – YouTube
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- Summary of article content: Articles about LIVE | DIY curved garden edging using treated pine, an affordable landscape solution. – YouTube Updating …
- Most searched keywords: Whether you are looking for LIVE | DIY curved garden edging using treated pine, an affordable landscape solution. – YouTube Updating In this episode we tackle a forgotten corner of the yard and show you how basic treated pine edging can be manipulated to produce curved edges.Come along as …DIY, Landscaping, Garden, Garden edge, Garden Edging, Budget, Affordable, WLP, Work Live Play, Bunnings, Lowes, Ryobi, how to, do it yourself, how do I, gardening, edging, steel edge, backyard
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Bending Pressure-Treated Wood
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- Summary of article content: Articles about Bending Pressure-Treated Wood Steam bending of softwoods is much more difficult than hardwoods. Note that if you kerf PT lumber, you may expose untreated wood. Also, you will need to collect … …
- Most searched keywords: Whether you are looking for Bending Pressure-Treated Wood Steam bending of softwoods is much more difficult than hardwoods. Note that if you kerf PT lumber, you may expose untreated wood. Also, you will need to collect … Filenumber5263end BrettAH furniture, machining, creating, custom, design, construction, assembly, planning, joints, details, carpentry, trim, millwork, crown, base, casing, window, door, mouldings KBIndex KBAM KBAMInstaller KBFurniture KBFurnitureOutdoorFurniture KBMISCEL KBBWGeneral 5STAR5 4IMAGEICON4 KBAM KBFurniture KBMISCELDetailed, authoritative information on the ins and outs of bending pressure-treated wood for curved outdoor decks or garden structures. May 23, 2007
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3 Ways to Bend Wood – wikiHow
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- Most searched keywords: Whether you are looking for 3 Ways to Bend Wood – wikiHow Updating Although most projects involving wood use straight boards, some require bent wood. Bent wood can add uniqueness and flair to a project. There are several different methods that can be used, each with its advantages and disadvantages….
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How To Bend Wood – This Old House
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- Most searched keywords: Whether you are looking for How To Bend Wood – This Old House Also, for bending wood with steam or hot water, as described below, you only have about 30 seconds before the board cools or dries enough to stop being pliable. Whether it’s a woodworking project, trimwork for a remodel, instrument making, or boatbuilding, learning to bend wood can take a project from seemingly impossible to doable. You just need to know how.
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How to Bend Wood The Need-to-Knows
How to Bend Wood with Kerf Cuts
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Bending Wood with Steam
The Best Types of Wood for Steam and Water Bending
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bending a 2 x 4
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- Summary of article content: Articles about bending a 2 x 4 They are pressure treated wood. I plan to try and bend along the brge top with clamps – no ea if this will work? How long do the boards need to soak? …
- Most searched keywords: Whether you are looking for bending a 2 x 4 They are pressure treated wood. I plan to try and bend along the brge top with clamps – no ea if this will work? How long do the boards need to soak? I’ve made a bridge with a curved top. I would now like ot add a curved 2 x 4 x 8′ hand railing, cuved the same shape as the bridge.
I have the boards soaking in the hope they will bend easier. They are pressure treated wood. I plan to try and bend along the bridge top with clamps – no idea if this w… - Table of Contents:
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Bending Pressure-Treated Wood
Bending Pressure-Treated Wood
Detailed, authoritative information on the ins and outs of bending pressure-treated wood for curved outdoor decks or garden structures. May 23, 2007
Question
Has anyone tried steam bending pressure treated lumber? I have a project that would require a radius of 36″ and I could use a 5/8″ thick board (nominally 1X stock). The problem is that I have yet to come across completely flatsawn boards to use. Most of the lumber I have inspected is riddled with knots, and I’m not sure what effect the steam would have on the preservative. Alternately I could kerf cut to achieve the bend. In this case I would use 5/4 stock. Is there a rule of thumb for the depth and spacing of the kerfs?
Forum Responses
(Furniture Making Forum)
From contributor K:
Steam-bending is not recommended for soft-woods.
I build a lot of curved decks, and laminate the outer rim joist (the curved parts) using PT, usually 2×6 or 2×8. (All the other framing material is PT also). I hand pick each board looking for FOH stock with the fewest knots.
I have my local lumberyard bandsaw split the 2x’s in half (ends up ~3/4 thick) then run that sawed face through their planer a light pass to flatten it down to around 5/8 and make a nice glue face.
I like to let those split boards acclimate in the shade for a few days on stickers, then laminate them all up with Poly glue, usually PL Premium. I usually go with three or four laminations. I’ve never done a 36″ radius though, but if I did I’d try splitting the board into thirds, then planing them down to say 3/8. I’d also bend them right up while still wet.
Do yourself a favor, and use a good quality redwood for your bent parts. In my experience, pressure treated lumber is wood that hasn’t even been dried, and when it does dry out, it will split, check and twist, and all your hard work will look like the type of wood that it is.Another issue with PT lumber is that only the outside is treated. So when a piece is ripped, untreated wood is exposed and that can certainly be an issue. The PT process does make the wood more brittle. As PT lumber is graded based on strength, and small knots do not cause great strength loss, it is hard to find knot-free wood.
Knot-free wood is generally not treated and is sold at very high prices. Steam bending of softwoods is much more difficult than hardwoods. Note that if you kerf PT lumber, you may expose untreated wood. Also, you will need to collect the sawdust and dispose of it in a landfill. Do not let the dust fly around or get into the soil.
We’ve steam bent PT Pine. Actually of the soft woods yellow pine is one of the best bending woods. However any exterior steam bent wood better be fastened/supported as it will tend to move with changes in moisture content.To contributor L: Do you dry the PTYP any before steaming it, or just use it saturated? Also, does it require longer steaming to get the temperature up all of the way to the middle?To contributor K – the results you get with any wood and the correct or optimum moisture depend on the severity of the bend. 25 to 28% MC is ideal for severe bends and 15% MC is OK for mild bends. Because of the density difference within an individual ring in SYP, it is prone to grain raising during or after bending. Therefore, to achieve success on a medium to severe bend, bend so the quarter-gain is inside and outside and the flat grain is to the edges.Joe WoodGene, could you explain your last sentence a little better? I have a feeling it’s a very important point about bending wood in general, and I don’t quite understand.When looking at a piece of wood that is to be bent, there will be four sides. Two of the sides will be flatsawn and two of the sides will be radial or quartersawn. A quartersawn face will have the annual rings at 90 degrees to the face. A flatsawn face will have the rings parallel or at 0 degrees to the face.
If you bend a piece so that the flat sawn faces are the inside and outside radii, then it is likely that the grain will separate. If you bend so that the flatsawn faces are the sides and the quartersawn faces are the outside and inside radii, then grain separation is not likely. (In other words, the best choice is to have the rings running from inside to outside and not edge to edge. Is this clear or should I post a picture?
Thanks Doc. So choose quarter or edge-grain to the form. I’ll bet that it would also be better to have slower growth pattern to reduce the size of the early wood as well?
What about my question of the bound water? It seems like it would take a lot more energy/time to get the temperature up all of the way to the middle, then there would be the hydraulic pressure within the cells, would it not?
On a moderate bend as used on the edge of a curved deck moisture content is not critical. The wetter wood will take longer to stabilize, but sometimes this can be done in its permanent position fastened to the joists, etc.
On more severe bends hydraulic pressure does have an affect. It can work for you or against you depending on the situation. In some dense woods it will increase the chance of tear or breakage on the outside of the bend. On the other hand in some soft woods hydraulic pressure is an aid in avoiding wrinkle on the inside of the bend. All the severe bends I am referring to will require end pressure. Also keep in mind that moisture added through soaking and steam will leave the bent piece more readily than original tree sap.
By using wood that is 22% to 28% MC, you will not have any hydraulic pressure as there is no liquid water at these MC’s. For ring porous hardwoods, slow growth increases the percentage of earlywood compared to faster growth. The opposite goes for softwoods.
Hope this helps.
Gene, I have another question for you, actually two more! I’m going to laminate up a moon gate, using 6- 1/2 x 3.5″ redwood. It’ll be a 7’4″ diameter circle. I’ll be using plain sawn stock, this is the best bending grain isn’t it? Also, should I put the barkside in?
I believe that you would be doing the opposite of what the picture shows. If so, I would worry about failures. On the other hand, a 7′ arch is not too severe, so it may work well.Gene, I’m not sure that you understood my question. I’m wondering if the barkside should be on the inside of the curve (like with this image below), or on the outside of the curve. Redwood bends so easily it probably isn’t an issue, but I would like to know anyway.
I have never heard of a difference between bark in or bark out. But the best bending is if the grain is 90 degrees from that shown.Gene, I’ll be starting the Moon gate soon and I’d like to clarify something before I start. Are you saying that a quartersawn 1×4 will bend better than a plainsawn one will? It seems to me that it’s the opposite because plain sawn boards seem a lot more floppy and bendable than quarter sawn ones.
All the data and experience I have saws that there is no difference between q-sawn and f-sawn bendability, given the same thickness, width, MC, etc. However, the grain is less likely to separate with q-sawn, so it is preferred over f-sawn. Of course, if the MC is incorrect, the bend is severe and so on, the grain orientation will not help.(Correction for above). All the data and experience I have shows that if you use f-sawn and the grain is perfectly parallel to the faces, which is not common with lumber that you buy today, it is less likely to have grain failure. For this reason, the “old guys” would split the log to determine the grain and saw parallel to the bark. They would then saw the pieces they needed with zero slope of grain (SOG). You can still see this being done at Colonial Williamsburg, VA, but it is rare in most other cases (although I did see it at McDermott cue and pool stick manufacturing).
How Long Do You Need to Soak Wood to Bend It? – Woodworker Lodge
Did you know that part of being a master woodworker is knowing how to bend wood? Many believe that woodworking involves cutting and shaving wood into shapes and parts. Although this makes up a significant part of woodworking, there’s another crucial task that woodworkers often have to perform. They have to soak the wood in water to bend it and get it into a certain shape.
To efficiently make the wood bendable, it’s recommended that you soak the wood in relatively hot water for one to three hours. Many other factors can change this, but one to three hours will work for most wood types.
This is a good general guideline to follow, but again depending on the type of wood you’re using. How you’re actually soaking the wood, the recommended time can change drastically. If you’re interested in woodworking and would like more advice, the rest of the article will further explain how to bend wood by soaking properly.
At our Cucamonga Woodworking live online workshops we discuss bend and steaming wood at about the 5 minute mark of this video. You can also check out our other past workshops on Youtube Here(Link to Cucamonga Woodworking)
The General Process of Wood Soaking
You now know how long to leave your wood soaking, but it’s important to know the entire process so that you can correctly soak your wood for the best results.
The general process is as follows:
Identify and select the type of wood you want to bend
Select the container that the wood and water will be stored in
Soak the wood in the water in the container
Wait for the right amount of absorption and then bend the wood
Harden the wood after its bent
Choosing The Wood and Container
Knowing and selecting the type of wood that you’re going to be working with is the most important step, affecting how you carry out the rest of the bending process.
When choosing your wood, the factor you should focus on the most is the wood’s thickness. There are many other characteristics you should consider, but they will be covered in a later section.
In terms of choosing your container, you obviously want to make sure that it will be big enough to hold water and wood. It’s also important to make sure that your container will handle relatively high temperatures because you typically want to use hot water for wood bending.
There are many types of containers that you could use, so make sure to use one to work well for your wood.
Soaking and Bending the Wood
When you start soaking the wood, you again want to use hot water over cold water to get faster and better results. As we answered in the earlier section, after you place the wood in the water, the general recommendation is to leave it there for one to three hours.
However, you must realize the recommended soaking time can change very easily, depending on the actual wood type. Some wood can have substantial differences based on the change of only a few minutes.
After you’ve left the wood to soak for the right amount of time, you want to take it out when it appears that the wood is fully wet. This is very important when you start bending the wood because it will help the wood keep its shape.
After bending the wood, you want to let it dry naturally, and if needed, you can use direct heat to speed up the drying process.
Making Sure The Wood Stays Bent
This part of the process happens after you’ve soaked and bent the wood, but it’s just as important because you want to make sure that the wood actually keeps its new shape.
There are many ways to make sure the wood stays bent, but some common methods include:
Coating the wood with a special glue to harden it
Using clamps to make sure the wood stays in place
Different Factors That Affect Bending Wood
When you bend wood, you are essentially trying to increase its elasticity (how easy it is to stretch or compress a certain material). That’s why we use hot water to bend wood because heat and moisture are some of the strongest influencers for a material’s elasticity.
That’s also why we subsequently remove the water from the wood by drying it when we want the wood to retain its shape. Some people even pre-soak their wood by placing it in a steaming chamber beforehand.
Using the Right Amount of Force
Another important determining factor is the force that the wood itself is going through. No matter how much you influence the wood’s elasticity, you’re still going to bend it in a way that wood is not naturally meant to be bent. The wood is going through a combination of tension and compression, and the more you bend it, the stronger those forces are.
Tips to Avoid Breakage
If the forces get too strong, your wood can end up breaking apart. To help avoid breakage, it’s advised that you push on the wood’s ends while you bend it.
This helps reduce the wood experiences’ forces, and it will greatly reduce the chances that your wood breaks. There are many different devices that you can use to help with this. You also want to bend the wood slowly and gradually to absorb the stress more easily.
What’s equally as important as those external physical factors are the traits of the wood itself, which include:
Woodgrain angle: you want the woodgrain to be in parallel with the sides
Pith strength: you want the pith (center of the tree) to be strong
Wood density: you want your wood to be low in density
How much the wood has decayed: you want your wood to be fresh and moisturized
Other Methods for Bending Wood
Now that you have a good understanding of soaking wood to bend it, you may be interested in learning about the other techniques you can use to bend wood. All these options each have their own advantages and disadvantages, but many of the factors and affecting traits we’ve discussed earlier still apply to these methods.
Steam Bending
This method is the most similar to soaking wood, and we mentioned it briefly before. Instead of completely submerging the wood in water instead, place it into a chamber that’s very hot, humid, and steamy.
Once you leave the wood in for long enough, you can take it out and start bending. The drawback to this method is that you have to bend your wood very quickly once you take it out.
Using Glued Laminated Wood
Using Glued, Laminated Wood is another common method. This special type of wood is made by gluing together individual pieces of wood. This will typically make the structure more durable, and, in contrast to what we want when soaking wood, it makes it more resistant to more moisture.
There’s no steam or water involved whatsoever, and it’s straightforward to bend the wood by creating it in a certain pattern.
Kerf Cut
Finally, the Kerf Cut is the most simple method for bending wood. It involves cutting multiple tiny slits across the wood piece so that it’s much easier to bend. It’s the most straightforward process, but it has some drawbacks when compared to soaking wood:
It can’t be used for structural parts
It weakens the wood itself
You need to cover up the cuts with a wooden sheet
Finals Words on Soaking Wood
Soaking wood can be an effective and efficient way for you to bend your wood, but there are a lot of factors you have to think about, especially if you’re deciding which other wood bending methods you might also want to use.
The procedure itself is easy to understand and execute. The only thing you would have to take time with is actually learning about the wood you’re going to bend. Other than that, soaking wood is a simple way to make water a woodworker’s best friend.
Bending Pressure-Treated Wood
Bending Pressure-Treated Wood
Detailed, authoritative information on the ins and outs of bending pressure-treated wood for curved outdoor decks or garden structures. May 23, 2007
Question
Has anyone tried steam bending pressure treated lumber? I have a project that would require a radius of 36″ and I could use a 5/8″ thick board (nominally 1X stock). The problem is that I have yet to come across completely flatsawn boards to use. Most of the lumber I have inspected is riddled with knots, and I’m not sure what effect the steam would have on the preservative. Alternately I could kerf cut to achieve the bend. In this case I would use 5/4 stock. Is there a rule of thumb for the depth and spacing of the kerfs?
Forum Responses
(Furniture Making Forum)
From contributor K:
Steam-bending is not recommended for soft-woods.
I build a lot of curved decks, and laminate the outer rim joist (the curved parts) using PT, usually 2×6 or 2×8. (All the other framing material is PT also). I hand pick each board looking for FOH stock with the fewest knots.
I have my local lumberyard bandsaw split the 2x’s in half (ends up ~3/4 thick) then run that sawed face through their planer a light pass to flatten it down to around 5/8 and make a nice glue face.
I like to let those split boards acclimate in the shade for a few days on stickers, then laminate them all up with Poly glue, usually PL Premium. I usually go with three or four laminations. I’ve never done a 36″ radius though, but if I did I’d try splitting the board into thirds, then planing them down to say 3/8. I’d also bend them right up while still wet.
Do yourself a favor, and use a good quality redwood for your bent parts. In my experience, pressure treated lumber is wood that hasn’t even been dried, and when it does dry out, it will split, check and twist, and all your hard work will look like the type of wood that it is.Another issue with PT lumber is that only the outside is treated. So when a piece is ripped, untreated wood is exposed and that can certainly be an issue. The PT process does make the wood more brittle. As PT lumber is graded based on strength, and small knots do not cause great strength loss, it is hard to find knot-free wood.
Knot-free wood is generally not treated and is sold at very high prices. Steam bending of softwoods is much more difficult than hardwoods. Note that if you kerf PT lumber, you may expose untreated wood. Also, you will need to collect the sawdust and dispose of it in a landfill. Do not let the dust fly around or get into the soil.
We’ve steam bent PT Pine. Actually of the soft woods yellow pine is one of the best bending woods. However any exterior steam bent wood better be fastened/supported as it will tend to move with changes in moisture content.To contributor L: Do you dry the PTYP any before steaming it, or just use it saturated? Also, does it require longer steaming to get the temperature up all of the way to the middle?To contributor K – the results you get with any wood and the correct or optimum moisture depend on the severity of the bend. 25 to 28% MC is ideal for severe bends and 15% MC is OK for mild bends. Because of the density difference within an individual ring in SYP, it is prone to grain raising during or after bending. Therefore, to achieve success on a medium to severe bend, bend so the quarter-gain is inside and outside and the flat grain is to the edges.Joe WoodGene, could you explain your last sentence a little better? I have a feeling it’s a very important point about bending wood in general, and I don’t quite understand.When looking at a piece of wood that is to be bent, there will be four sides. Two of the sides will be flatsawn and two of the sides will be radial or quartersawn. A quartersawn face will have the annual rings at 90 degrees to the face. A flatsawn face will have the rings parallel or at 0 degrees to the face.
If you bend a piece so that the flat sawn faces are the inside and outside radii, then it is likely that the grain will separate. If you bend so that the flatsawn faces are the sides and the quartersawn faces are the outside and inside radii, then grain separation is not likely. (In other words, the best choice is to have the rings running from inside to outside and not edge to edge. Is this clear or should I post a picture?
Thanks Doc. So choose quarter or edge-grain to the form. I’ll bet that it would also be better to have slower growth pattern to reduce the size of the early wood as well?
What about my question of the bound water? It seems like it would take a lot more energy/time to get the temperature up all of the way to the middle, then there would be the hydraulic pressure within the cells, would it not?
On a moderate bend as used on the edge of a curved deck moisture content is not critical. The wetter wood will take longer to stabilize, but sometimes this can be done in its permanent position fastened to the joists, etc.
On more severe bends hydraulic pressure does have an affect. It can work for you or against you depending on the situation. In some dense woods it will increase the chance of tear or breakage on the outside of the bend. On the other hand in some soft woods hydraulic pressure is an aid in avoiding wrinkle on the inside of the bend. All the severe bends I am referring to will require end pressure. Also keep in mind that moisture added through soaking and steam will leave the bent piece more readily than original tree sap.
By using wood that is 22% to 28% MC, you will not have any hydraulic pressure as there is no liquid water at these MC’s. For ring porous hardwoods, slow growth increases the percentage of earlywood compared to faster growth. The opposite goes for softwoods.
Hope this helps.
Gene, I have another question for you, actually two more! I’m going to laminate up a moon gate, using 6- 1/2 x 3.5″ redwood. It’ll be a 7’4″ diameter circle. I’ll be using plain sawn stock, this is the best bending grain isn’t it? Also, should I put the barkside in?
I believe that you would be doing the opposite of what the picture shows. If so, I would worry about failures. On the other hand, a 7′ arch is not too severe, so it may work well.Gene, I’m not sure that you understood my question. I’m wondering if the barkside should be on the inside of the curve (like with this image below), or on the outside of the curve. Redwood bends so easily it probably isn’t an issue, but I would like to know anyway.
I have never heard of a difference between bark in or bark out. But the best bending is if the grain is 90 degrees from that shown.Gene, I’ll be starting the Moon gate soon and I’d like to clarify something before I start. Are you saying that a quartersawn 1×4 will bend better than a plainsawn one will? It seems to me that it’s the opposite because plain sawn boards seem a lot more floppy and bendable than quarter sawn ones.
All the data and experience I have saws that there is no difference between q-sawn and f-sawn bendability, given the same thickness, width, MC, etc. However, the grain is less likely to separate with q-sawn, so it is preferred over f-sawn. Of course, if the MC is incorrect, the bend is severe and so on, the grain orientation will not help.(Correction for above). All the data and experience I have shows that if you use f-sawn and the grain is perfectly parallel to the faces, which is not common with lumber that you buy today, it is less likely to have grain failure. For this reason, the “old guys” would split the log to determine the grain and saw parallel to the bark. They would then saw the pieces they needed with zero slope of grain (SOG). You can still see this being done at Colonial Williamsburg, VA, but it is rare in most other cases (although I did see it at McDermott cue and pool stick manufacturing).
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