Wood Grading - User contributions [en-gb]

H1

2025-09-19T04:42:13Z

Peter wood:

H1 is a lower-level treatment used for timber that will be in a dry, indoor environment. The main goal of H1 treatment is to protect the timber from [[Lyctid borers[[ (also known as powder post beetles) and, in some cases, other insects.<ref>https://www.epa.nsw.gov.au/Your-environment/Household-building-and-renovation/Treated-timber/timber-treatments/boron-based-treated-timber#:~:text=large%20environmental%20threat.-,Boron%2Dbased%20treated%20timber,borer%20(Powder%20post%20borer).</ref>

The primary chemical used for H1 treatment is a boron compound, specifically disodium octaborate tetrahydrate.<ref>https://www.epa.nsw.gov.au/Your-environment/Household-building-and-renovation/Treated-timber/timber-treatments/boron-based-treated-timber#:~:text=The%20active%20ingredient%20of%20boron,of%20the%20Tropic%20of%20Capricorn.</ref>

Here's why boron is the ideal chemical for H1:

'''Low Hazard:''' Boron compounds are considered low in toxicity to mammals and are less of an environmental concern compared to the chemicals used in higher hazard level treatments (like the arsenic in CCA). This makes it suitable for indoor applications where human contact is more likely.

'''Effective Against Borers:''' Boron is highly effective at killing the insects and larvae of Lyctid borers, which are the main threat to susceptible hardwoods used in indoor applications.

'''Water-Based:''' Boron treatments are typically water-based. The timber is often soaked or pressure-treated with the solution, and the boron then diffuses into the wood.

'''Not Leaching-Resistant:''' A key characteristic of boron is that it can leach out of the timber if it gets wet. This is why H1-treated timber is only for indoor, above-ground applications where it is completely protected from moisture and weather. If it were to be used outdoors, rain would wash the preservative away, rendering the treatment ineffective.

In some contexts, especially in Australia, H2 treatments which also use boron (but with a higher retention level and sometimes in combination with other chemicals) are often used as a standard for internal framing. However, for H1, boron is the core chemical used to protect against borers.

== References ==
{{reflist}}

H1

2025-09-19T04:01:24Z

Peter wood: Created page with "H1 is a lower-level treatment used for timber that will be in a dry, indoor environment. The main goal of H1 treatment is to protect the timber from Lyctid borers (also known as powder post beetles) and, in some cases, other insects. The primary chemical used for H1 treatment is a boron compound, specifically disodium octaborate tetrahydrate. Here's why boron is the ideal chemical for H1: '''Low Hazard:''' Boron compounds are considered low in toxicity to mammals and..."

H1 is a lower-level treatment used for timber that will be in a dry, indoor environment. The main goal of H1 treatment is to protect the timber from Lyctid borers (also known as powder post beetles) and, in some cases, other insects.

The primary chemical used for H1 treatment is a boron compound, specifically disodium octaborate tetrahydrate.

Here's why boron is the ideal chemical for H1:

'''Low Hazard:''' Boron compounds are considered low in toxicity to mammals and are less of an environmental concern compared to the chemicals used in higher hazard level treatments (like the arsenic in CCA). This makes it suitable for indoor applications where human contact is more likely.

'''Effective Against Borers:''' Boron is highly effective at killing the insects and larvae of Lyctid borers, which are the main threat to susceptible hardwoods used in indoor applications.

'''Water-Based:''' Boron treatments are typically water-based. The timber is often soaked or pressure-treated with the solution, and the boron then diffuses into the wood.

'''Not Leaching-Resistant:''' A key characteristic of boron is that it can leach out of the timber if it gets wet. This is why H1-treated timber is only for indoor, above-ground applications where it is completely protected from moisture and weather. If it were to be used outdoors, rain would wash the preservative away, rendering the treatment ineffective.

In some contexts, especially in Australia, H2 treatments which also use boron (but with a higher retention level and sometimes in combination with other chemicals) are often used as a standard for internal framing. However, for H1, boron is the core chemical used to protect against borers.

H-series

2025-09-19T04:00:27Z

Peter wood:

The H-series is a system for classifying the hazard level of timber, which determines the type and amount of preservative treatment required to protect it from decay and insects. The higher the number, the greater the hazard and the more protection the timber needs. This system is based on Australian Standards and is crucial for selecting the right timber for a specific application.

H-series hazard levels:

'''[[H1]] (Inside, above ground):''' This is the lowest level of treatment. It's for timber used indoors, in well-ventilated areas, and completely protected from the weather. It primarily protects against borers, but not termites.

'''[[H2]] (Inside, above ground):''' Similar to H1, this is for timber used indoors and protected from wetting. However, it provides protection against both borers and termites.

'''[[H3]] (Outside, above ground):''' This is for timber used outdoors, but not in contact with the ground. It's exposed to periodic wetting and leaching, and is treated to protect against moderate decay, borers, and termites. Examples include decking, fascia boards, and outdoor framing.

'''[[H4]] (Outside, in-ground):''' This is the hazard level you asked about. H4 timber is designed for applications where it will be in contact with the ground or in continually damp situations. It's treated to resist severe decay, borers, and termites. Common uses include fence posts, garden beds, and pergola posts that are set in the ground.

'''[[H5]] (Outside, in-ground, or in fresh water):''' This level is for timber in contact with the ground or in freshwater. It offers protection against very severe decay, borers, and termites, and is used for critical applications like retaining walls, house stumps, and building poles.

'''[[H6]] (Marine waters):''' This is the highest level of treatment, designed for timber that will be in prolonged contact with saltwater. It protects against marine wood borers and decay. Examples include boat hulls, jetty piles, and marine-related structures.

Key points about the H-series system:

Higher number, greater protection: A timber treated to a higher H level (e.g., H4) can be used for applications that require a lower level of treatment (e.g., H3, H2, or H1), but not the other way around.

Application-specific: The appropriate H level is determined by the environment and intended use of the timber.

Chemicals vary: Different chemicals and treatment processes are used to achieve the various H levels, with the higher levels requiring a higher concentration and deeper penetration of preservatives.

H-series

2025-09-19T03:48:42Z

Peter wood: Created page with "The H-series is a system for classifying the hazard level of timber, which determines the type and amount of preservative treatment required to protect it from decay and insects. The higher the number, the greater the hazard and the more protection the timber needs. This system is based on Australian Standards and is crucial for selecting the right timber for a specific application. H-series hazard levels: H1 (Inside, above ground): This is the lowest level of treatmen..."

The H-series is a system for classifying the hazard level of timber, which determines the type and amount of preservative treatment required to protect it from decay and insects. The higher the number, the greater the hazard and the more protection the timber needs. This system is based on Australian Standards and is crucial for selecting the right timber for a specific application.

H-series hazard levels:

H1 (Inside, above ground): This is the lowest level of treatment. It's for timber used indoors, in well-ventilated areas, and completely protected from the weather. It primarily protects against borers, but not termites.

H2 (Inside, above ground): Similar to H1, this is for timber used indoors and protected from wetting. However, it provides protection against both borers and termites.

H3 (Outside, above ground): This is for timber used outdoors, but not in contact with the ground. It's exposed to periodic wetting and leaching, and is treated to protect against moderate decay, borers, and termites. Examples include decking, fascia boards, and outdoor framing.

H4 (Outside, in-ground): This is the hazard level you asked about. H4 timber is designed for applications where it will be in contact with the ground or in continually damp situations. It's treated to resist severe decay, borers, and termites. Common uses include fence posts, garden beds, and pergola posts that are set in the ground.

H5 (Outside, in-ground, or in fresh water): This level is for timber in contact with the ground or in freshwater. It offers protection against very severe decay, borers, and termites, and is used for critical applications like retaining walls, house stumps, and building poles.

H6 (Marine waters): This is the highest level of treatment, designed for timber that will be in prolonged contact with saltwater. It protects against marine wood borers and decay. Examples include boat hulls, jetty piles, and marine-related structures.

Key points about the H-series system:

Higher number, greater protection: A timber treated to a higher H level (e.g., H4) can be used for applications that require a lower level of treatment (e.g., H3, H2, or H1), but not the other way around.

Application-specific: The appropriate H level is determined by the environment and intended use of the timber.

Chemicals vary: Different chemicals and treatment processes are used to achieve the various H levels, with the higher levels requiring a higher concentration and deeper penetration of preservatives.

F-grades

2025-09-16T22:34:20Z

Peter wood: Created page with "Visually Stress-Grading"

[[Visually Stress-Grading]]

Visually Stress-Graded

2025-09-16T22:33:27Z

Peter wood: Peter wood moved page Visually Stress-Graded to Visually Stress-Grading

#REDIRECT [[Visually Stress-Grading]]

Visually Stress-Grading

2025-09-16T22:33:27Z

Peter wood: Peter wood moved page Visually Stress-Graded to Visually Stress-Grading

In Australia, visually stress-graded structural timber is classified using F-grades (e.g., F5, F7, F11, F17, F22, F27). The “F” number represents the characteristic bending strength of the timber in megapascals (MPa), which is a measure of how much stress the timber can safely carry in structural applications. The grading is determined by visual inspection, considering features such as knots, slope of grain, checks, splits, and other natural growth characteristics that affect strength. A higher F-number means stronger timber with higher structural capacity. These grades apply to both softwoods and hardwoods used in Australian construction. <br>

Common Visual Stress Grades (AS 1720 / AS 2082):<br>

F5 – Very low strength grade, often used for non-structural or light structural purposes.<br>

F7 – Common in plantation softwoods (like Radiata Pine). Used for light framing where loads are modest.<br>

F8 – Slightly stronger softwood, sometimes used in light framing.<br>

F11 – Entry point for structural hardwoods. Strong enough for standard beams, joists, and posts.<br>

F14 – Stronger hardwood option, commonly used in residential and light commercial work.<br>

F17 – A widely used grade of structural hardwood, balancing strength and availability. Often used for heavier beams and posts.<br>

F22 – High-strength hardwood, suitable for demanding structural applications.<br>

F27 – Very strong grade, often seen in durable Australian hardwoods like Spotted Gum or Ironbark. Used in high-load applications.<br>

✅ In short:<br>

The F-number = characteristic bending strength in MPa.<br>

Higher numbers mean greater load capacity.<br>

Determined by visual inspection of defects and grain quality.<br>

Used in both hardwood and softwood for structural applications in Australia.<br>

🔹 Technically, F-grades could run from F1 upwards (since the “F” number is just the bending strength in MPa).<br>
🔹 In practice, only certain grades are used and standardised in Australia, because:<br>

Very weak grades like F1, F2, F3, F4 would represent timber with only 1–4 MPa bending strength — this is so low that such material isn’t suitable for structural use. It would split, sag, or fail under even light loads.<br>

The minimum grade used structurally is F5. Anything weaker than that is not considered structurally reliable.<br>

Not every number is used — the system “jumps” (e.g., F5, F7, F8, F11, F14, F17, F22, F27). These are the grades codified in AS 1720.1 and AS 2082 for design and supply.<br>

Visually Stress-Grading

2025-09-16T22:31:07Z

Peter wood: Created page with "In Australia, visually stress-graded structural timber is classified using F-grades (e.g., F5, F7, F11, F17, F22, F27). The “F” number represents the characteristic bending strength of the timber in megapascals (MPa), which is a measure of how much stress the timber can safely carry in structural applications. The grading is determined by visual inspection, considering features such as knots, slope of grain, checks, splits, and other natural growth characteristics th..."

Timber Grading Standards from around the World

2025-09-16T22:27:44Z

Peter wood: Created page with "Australia: * AS 1684 (framing). * AS 1720 (structural design). * AS 2796 (hardwood flooring). * AS/NZS 1748: Product requirements for mechanically stress-graded timber. * AS 2082: For visually stress-graded hardwood. * AS 2858: For visually stress-graded softwood. USA: * Wisconsin: ** [https://www.fpl.fs.usda.gov/documnts/fpltn/fpltn-200.pdf/ Technical Note 200] * Northeastern Lumber Manufacturers Association ** [https://www.nelma.org/the-grade-rule-book/ THE GRADE R..."

Australia:
* AS 1684 (framing).
* AS 1720 (structural design).
* AS 2796 (hardwood flooring).
* AS/NZS 1748: Product requirements for mechanically stress-graded timber.
* AS 2082: For visually stress-graded hardwood.
* AS 2858: For visually stress-graded softwood.

USA:
* Wisconsin:
** [https://www.fpl.fs.usda.gov/documnts/fpltn/fpltn-200.pdf/ Technical Note 200]
* Northeastern Lumber Manufacturers Association
** [https://www.nelma.org/the-grade-rule-book/ THE GRADE RULE BOOK]
Canada:

MediaWiki:Common.css

2025-09-16T01:53:45Z

Peter wood:

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MediaWiki:Common.css

2025-09-16T01:53:30Z

Peter wood:

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Main Page

2025-09-16T01:52:52Z

Peter wood:

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Timber Grading Standards
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MediaWiki:Common.css

2025-09-16T01:52:44Z

Peter wood:

MediaWiki:Common.css

2025-09-16T01:51:05Z

Peter wood:

/* CSS placed here will be applied to all skins */

/* starting from this url, https://simplywoodgrading.com/mediawiki/index.php/MediaWiki:Common.css */

/* give it a go Peter */

.center img:hover {
cursor: pointer;
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display: flex;
justify-content: center; /* Centers horizontally */
align-items: center; /* Centers vertically */
width: 100%; /* This is the key. Make the container fill the full width. */
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Main Page

2025-09-16T01:44:33Z

Peter wood:

MediaWiki:Common.css

2025-09-16T01:44:00Z

Peter wood:

2025-01-23T08:40:41Z

Peter wood:

<div style="float: right; margin: 0 0 1em 1em; width: 300px; border: 1px solid #aaa; background-color: #f9f9f9; padding: 10px; font-size: 90%;">
<div style="font-weight: bold; font-size: 110%; text-align: center; margin-bottom: 0.5em;">Great Wall Steed</div>
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<th style="text-align: left; padding: 2px 5px; background-color: #f2f2f2; border-bottom: 1px solid #ddd;">Production</th>
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<li>WCF217 Wesfil Diesel Fuel Filter</li>
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<li>BF954 Baldwin Fuel Spin-on</li>
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<li>Toyota Celica Camry</li>
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<h1 style="font-size: 24px; background-color: #f9f9f9; margin: 0; border-bottom: 1px solid #aaa;padding-left: 20px;">Oil Filter</h1>
<ul style="list-style-type: disc; padding-left: 20px; margin: 0;">
<li style="font-size: 20px; margin-bottom: 5px;">WZ516 Wesfil Oil Filter</li>
<li style="font-size: 20px; margin-bottom: 5px;">Z516 Ryco Oil Filter</li>
<li style="font-size: 20px; margin-bottom: 5px;">C-1922 - Sakura Oil Filter</li>
<li style="font-size: 20px; margin-bottom: 5px;">NIPPON MAX Oil Filter WZ79NM</li>
</ul>
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<div style="float: left; margin-right: 1em; border: 1px solid #aaa; padding: 0; width: calc(90% - 300px); box-sizing: border-box;margin-top: 20px;">
<h1 style="font-size: 24px; background-color: #f9f9f9; margin: 0; border-bottom: 1px solid #aaa;padding-left: 20px;">Oil Filter</h1>
<ul style="list-style-type: disc; padding-left: 20px; margin: 0;">
<li style="font-size: 20px; margin-bottom: 5px;">WZ516 Wesfil Oil Filter</li>
<li style="font-size: 20px; margin-bottom: 5px;">Z516 Ryco Oil Filter</li>
<li style="font-size: 20px; margin-bottom: 5px;">C-1922 - Sakura Oil Filter</li>
<li style="font-size: 20px; margin-bottom: 5px;">NIPPON MAX Oil Filter WZ79NM</li>
</ul>
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<div style="float: left; margin-right: 1em; border: 1px solid #aaa; padding: 0; width: calc(90% - 300px); box-sizing: border-box;margin-top: 20px;">
<h1 style="font-size: 24px; background-color: #f9f9f9; margin: 0; border-bottom: 1px solid #aaa;padding-left: 20px;">Oil Filter</h1>
<ul style="list-style-type: disc; padding-left: 20px; margin: 0;">
<li style="font-size: 20px; margin-bottom: 5px;">WZ516 Wesfil Oil Filter</li>
<li style="font-size: 20px; margin-bottom: 5px;">Z516 Ryco Oil Filter</li>
<li style="font-size: 20px; margin-bottom: 5px;">C-1922 - Sakura Oil Filter</li>
<li style="font-size: 20px; margin-bottom: 5px;">NIPPON MAX Oil Filter WZ79NM</li>
</ul>
</div>

<div style="float: left; margin-right: 1em; border: 1px solid #aaa; padding: 0; width: calc(90% - 300px); box-sizing: border-box;margin-top: 20px;">
<h1 style="font-size: 24px; background-color: #f9f9f9; margin: 0; border-bottom: 1px solid #aaa;padding-left: 20px;">Oil Filter</h1>
<ul style="list-style-type: disc; padding-left: 20px; margin: 0;">
<li style="font-size: 20px; margin-bottom: 5px;">WZ516 Wesfil Oil Filter</li>
<li style="font-size: 20px; margin-bottom: 5px;">Z516 Ryco Oil Filter</li>
<li style="font-size: 20px; margin-bottom: 5px;">C-1922 - Sakura Oil Filter</li>
<li style="font-size: 20px; margin-bottom: 5px;">NIPPON MAX Oil Filter WZ79NM</li>
</ul>
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<div style="float: left; margin-right: 1em; border: 1px solid #aaa; padding: 0; width: calc(90% - 300px); box-sizing: border-box;margin-top: 20px;">
<h1 style="font-size: 24px; background-color: #f9f9f9; margin: 0; border-bottom: 1px solid #aaa;padding-left: 20px;">Oil Filter</h1>
<ul style="list-style-type: disc; padding-left: 20px; margin: 0;">
<li style="font-size: 20px; margin-bottom: 5px;">WZ516 Wesfil Oil Filter</li>
<li style="font-size: 20px; margin-bottom: 5px;">Z516 Ryco Oil Filter</li>
<li style="font-size: 20px; margin-bottom: 5px;">C-1922 - Sakura Oil Filter</li>
<li style="font-size: 20px; margin-bottom: 5px;">NIPPON MAX Oil Filter WZ79NM</li>
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Main Page

2025-01-22T11:25:57Z

Peter wood:

Main Page

2025-01-22T10:39:16Z

Peter wood:

2023-04-17T06:06:42Z

Peter wood:

<div style="border: 3px double #ccc; float:right; width:15%; background-color:#eaf3f9; padding:10px;text-align: left;">
<p style="text-align: center;"><u>All Knots</u></p>
*[[Knot]]
*[[Knot Hole]]
*[[Cone Hole]]
*[[Loose Knot]]
*[[Double knot]]
*[[Sound Knot]]
*[[Sound Tight Encased Knot]]
*[[Sound Tight Knot]]
</div>

A sound tight encased knot in lumber is a knot that is fully surrounded by wood fibers, without any visible cracks or voids. This type of knot is also sometimes referred to as a "dead" knot or "encased" knot.

Unlike sound tight knots, which may be visible on the surface of the wood, sound tight encased knots are completely surrounded by the surrounding wood fibers, creating a more uniform appearance.