In general, a wood table is well enough to bear any load, because it is actually difficult to (68kg). Feel the wood to understand if it is soft or hard. It is common to classify wood as either softwood or Manufacturer Warranty: See store for details: Questions & Answers. The maximum load capacity of the wood table is about 150 lbs. 3. The first examples, tusked joints, were found in a well near Leipzig the world's oldest intact wooden architecture. Mahogany is hard. Despite the fir name, Douglas fir is not a true fir tree. Since the Douglas fir is rigid and sturdy, it can be used for a variety of purposes. Crack Resistance Birch, Mahogany, White or red oak, Poplar, Cherry, Maple, Redwood, Cedar, Douglas fir, Yellow pine, Spruce are the best wood for exterior columns. Call Tom Or Pat at 877.983.6367 to discuss your Hard Maple needs. Douglas-Fir: Pseudotsuga menziesii: 7.07: Tamarack: Larix larcina: 7.07: Goncalo Alves: Astronium graveolens: 7.05: What is needed is wood that is HARD to bend and hard to break. Balsa seems soft but is technically a Hardwood. It works okay enough for construction purposes. Most wood types are perfect for exterior columns as long as they can support roof weight, consist of good quality wood grades, and have an aesthetic look and style. Our millworks can manufacture Douglas Fir products for you like mouldings, paneling, or whatever you can dream up. Copy and paste this code into your website. Prices for basic Douglas fir trim range from $1.75 to $3 in interior spaces and $2.50 to $4 on the exterior. Here in our Ted Todd Blog youll find tales of development and inspiration, stories about the different woods we use and how we sourced them and tips and ideas to make your wood floor shine, no matter the setting. Workability: Typically machines well, but has a moderate blunting effect on cutters. Framing, in construction, is the fitting together of pieces to give a structure support and shape. This strong, reliable and workable wood is perfect for use in many projects. The plywood core will vary depending on the quality of the panel but will usually be Douglas Fir, Meranti, or Okoume. The best indicator of mahogany is the dark fine lines to the grain. COMMON NAME: Brazilian Walnut, Iron wood COLOR DETAILS: Often dark chocolate brown but can vary from yellow green to reddish tones. Wood putty, also called plastic wood, is a substance used to fill imperfections, such as nail holes, in wood prior to finishing.It is often composed of wood dust combined with a binder that dries and a diluent (thinner), and, sometimes, pigment.Pore fillers used for large flat surfaces such as floors or table tops generally contain silica instead of or in addition to wood dust. doors mission door interior wood solid including masts, in wooden boatbuilding. Douglas Fir Wood. Although classified as a soft wood Siberian Larch is one of the hardest soft woods around, it is a hard-wearing tough timber which can be left untreated to naturally age (grey/Silver). The color will change over time with UV exposure to an aesthetically appealing patina. Hardwood seeds have a coveringshell or fruit, while Softwood does not. Accepts stains, glues, and finishes well. Prices for basic Douglas fir trim range from $1.75 to $3 in interior spaces and $2.50 to $4 on the exterior. COMMON NAME: Brazilian Walnut, Iron wood COLOR DETAILS: Often dark chocolate brown but can vary from yellow green to reddish tones. Hard to beat Doug Fir or SYP. Wood is a porous and fibrous structural tissue found in the stems and roots of trees and other woody plants. Feel the wood to understand if it is soft or hard. But using it for making benches or other utilities is a big no. including masts, in wooden boatbuilding. The Timber Durability chart contains 5 classes of timber, with each class determining how long each timber listed will last these are all to BS EN 350-2:1994 Durability of wood and wood-based products. As with all our products, J. Gibson McIlvain strives to provide a higher quality. Wood Vendors offers multiple thicknesses of Hard Maple Lumber as well as ripped or s4s dimensional maple and Hard Maple Mouldings. US Wood Screws - Nominal Sizes - Wood screws - nominal sizes vs. diameters. Hard to beat Doug Fir or SYP. WOOD SPECIES: RATING: SOFT TO HARD: Douglas Fir: 660: Southern. menziesii) Rocky Mountain Douglas-fir (Pseudotsuga menziesii var. If it is not, then it is a veener. Crack Resistance Typical questions asked about products: Hard to beat Doug Fir or SYP. 2 in. Douglas Fir structural timbers are available on a special order basis. COMMON NAME: Brazilian Walnut, Iron wood COLOR DETAILS: Often dark chocolate brown but can vary from yellow green to reddish tones. Mortise and tenon joints have also been found joining the wooden planks of the "Khufu ship", a 43.6 m (143 ft) long vessel sealed into a pit in the Giza pyramid complex of the Fourth Dynasty American Douglas Fir softwood is a light brown to a reddish brown colour with few knots and is harder and more durable than its European Douglas cousin. Ask the First Question. We carry a wide range of rough sawn sizes in typical 4/4 and 8/4 lumber and supply it kiln dried or radio frequency kiln dried for a 100% dry large timber. Douglas Fir structural timbers are available on a special order basis. Call Tom Or Pat at 877.983.6367 to discuss your Hard Maple needs. The Journal Our primary talents may lie in creating fine wood floors, but we at Ted Todd also love to tell stories. LibriVox About. It works okay enough for construction purposes. Advantages of Wood. Wood Species: Douglas Fir: Warranty / Certifications. There are three varieties: coast Douglas-fir (P. menziesii var. Odor: Has a distinct, resinous odor when being worked. Odor: Has a distinct, resinous odor when being worked. Wood Vendors offers multiple thicknesses of Hard Maple Lumber as well as ripped or s4s dimensional maple and Hard Maple Mouldings. Douglas-fir, interior north: Pseudotsuga menziesii: 2.7: 600: Spanish-cedar: Cedrela spp. Coast Douglas Fir Pseudotsuga menziesii var. These were nice clean 2x4x16's. Rot Resistance: Douglas-Fir heartwood is rated to be moderately durable in regard to decay, but is susceptible to insect attack. These were nice clean 2x4x16's. glauca) Indian mahogany, chickrassy, chittagong wood (Chukrasia velutina) Spanish Cedar, cedro, Brazilian mahogany (Cedrela odorata) Hard maple Sugar maple (Acer saccharum) Black maple (Acer nigrum) Soft maple WEIGHT: 5.5 lbs per B.F. WORKABILITY: Very Hard will dull blades and tools The Douglas fir (Pseudotsuga menziesii) is an evergreen conifer species in the pine family, Pinaceae.It is native to western North America and is also known as Douglas-fir, Douglas spruce, Oregon pine, and Columbian pine. Natural durability of solid wood. Softwood is wood from gymnosperm trees such as conifers.The term is opposed to hardwood, which is the wood from angiosperm trees. There are three varieties: coast Douglas-fir (P. menziesii var. 3. US Wood Screws - Pilot Holes - Hard wood and soft wood pilot holes, shank clearance holes and countersink diameters. Feel the wood to understand if it is soft or hard. including masts, in wooden boatbuilding. Rustic hard maple is used frequently in commercial and residential applications that are meant to have an antique or a country style look. LibriVox is a hope, an experiment, and a question: can the net harness a bunch of volunteers to help bring books in the public domain to life through podcasting? The Timber Durability chart contains 5 classes of timber, with each class determining how long each timber listed will last these are all to BS EN 350-2:1994 Durability of wood and wood-based products. Natural durability of solid wood. Copy and paste this code into your website. This wood is used in the manufacturing of more products than any other lumber species. The Douglas fir (Pseudotsuga menziesii) is an evergreen conifer species in the pine family, Pinaceae.It is native to western North America and is also known as Douglas-fir, Douglas spruce, Oregon pine, and Columbian pine. Softwood is wood from gymnosperm trees such as conifers.The term is opposed to hardwood, which is the wood from angiosperm trees. Although classified as a soft wood Siberian Larch is one of the hardest soft woods around, it is a hard-wearing tough timber which can be left untreated to naturally age (grey/Silver). glauca) and Mexican Wood Species: Douglas Fir: Warranty / Certifications. That allows less wood to do the work. Drilling is a cutting process that uses a drill bit to cut a hole of circular cross-section in solid materials. LibriVox About. Douglas Fir. Douglas Fir structural timbers are available on a special order basis. If a painted solid color is what you want in a deck, you can choose a wood like hem-fir. x 12 ft. #2 and Better Prime Douglas Fir Lumber Pound for pound, Douglas fir is one of the Pound for pound, Douglas fir is one of the strongest western soft woods. Copy and paste this code into your website. This wood is used in the manufacturing of more products than any other lumber species. Framing, in construction, is the fitting together of pieces to give a structure support and shape.

Hardwood seeds have a coveringshell or fruit, while Softwood does not. Advantages of Wood. Mahogany is hard. are used without framing. Except for pallet wood, untreated hem-fir is the lowest cost wood decking board. Guide to natural durability and treatability of selected wood species of importance in Europe. x 12 ft. #2 and Better Prime Douglas Fir Lumber Pound for pound, Douglas fir is one of the Pound for pound, Douglas fir is one of the strongest western soft woods. The first examples, tusked joints, were found in a well near Leipzig the world's oldest intact wooden architecture. Softwood is wood from gymnosperm trees such as conifers.The term is opposed to hardwood, which is the wood from angiosperm trees. Rot Resistance: Douglas-Fir heartwood is rated to be moderately durable in regard to decay, but is susceptible to insect attack. menziesii: Green 450 26.1 53 Hard versus soft. Despite the fir name, Douglas fir is not a true fir tree. menziesii) Rocky Mountain Douglas-fir (Pseudotsuga menziesii var. x 8 in. LibriVox About. Identifying mahogany is a little easy. Wood is a porous and fibrous structural tissue found in the stems and roots of trees and other woody plants. Rustic hard maple is used frequently in commercial and residential applications that are meant to have an antique or a country style look. Douglas-Fir: Pseudotsuga menziesii: 7.07: Tamarack: Larix larcina: 7.07: Goncalo Alves: Astronium graveolens: 7.05: What is needed is wood that is HARD to bend and hard to break. But thats just a quick glimpse. Wood putty, also called plastic wood, is a substance used to fill imperfections, such as nail holes, in wood prior to finishing.It is often composed of wood dust combined with a binder that dries and a diluent (thinner), and, sometimes, pigment.Pore fillers used for large flat surfaces such as floors or table tops generally contain silica instead of or in addition to wood dust. The color will change over time with UV exposure to an aesthetically appealing patina. This strong, reliable and workable wood is perfect for use in many projects. This wood is used in the manufacturing of more products than any other lumber species. Wood is a better choice to reduce the emission of greenhouse gases, air and water pollution, and other impacts.Steel and concrete as the most consumed building materials use 12% and 20% more energy and emit 15% and 29% more greenhouse gases. The grain has to be long and also fine. But using it for making benches or other utilities is a big no. Wood Species: Douglas Fir: Warranty / Certifications. LibriVox is a hope, an experiment, and a question: can the net harness a bunch of volunteers to help bring books in the public domain to life through podcasting? x 8 in. Manufacturer Warranty: See store for details: Questions & Answers. 2 in. menziesii), Rocky Mountain Douglas-fir (P. menziesii var. Their use also releases 10% and 12% more pollutants into the air and generates 300% and 225% Framing materials are usually wood, engineered wood, or structural steel.The alternative to framed construction is generally called mass wall construction, where horizontal layers of stacked materials such as log building, masonry, rammed earth, adobe, etc. Balsa seems soft but is technically a Hardwood. If a painted solid color is what you want in a deck, you can choose a wood like hem-fir. Guide to natural durability and treatability of selected wood species of importance in Europe. The color will change over time with UV exposure to an aesthetically appealing patina. Hardwood seeds have a coveringshell or fruit, while Softwood does not. Except for pallet wood, untreated hem-fir is the lowest cost wood decking board. American Douglas Fir softwood is a light brown to a reddish brown colour with few knots and is harder and more durable than its European Douglas cousin. US Wood Screws - Nominal Sizes - Wood screws - nominal sizes vs. diameters. Hard to beat Doug Fir or SYP. Except for pallet wood, untreated hem-fir is the lowest cost wood decking board. Rot Resistance: Douglas-Fir heartwood is rated to be moderately durable in regard to decay, but is susceptible to insect attack. The main differences between hardwoods and softwoods is that the structure of hardwoods lack resin canals, whereas softwoods lack pores (though not all softwoods have resin canals). glauca) Indian mahogany, chickrassy, chittagong wood (Chukrasia velutina) Spanish Cedar, cedro, Brazilian mahogany (Cedrela odorata) Hard maple Sugar maple (Acer saccharum) Black maple (Acer nigrum) Soft maple are used without framing. menziesii), Rocky Mountain Douglas-fir (P. menziesii var. Rustic hard maple is used frequently in commercial and residential applications that are meant to have an antique or a country style look. Ask the First Question. This strong, reliable and workable wood is perfect for use in many projects. The majority of douglas-fir available for purchase is for building and framing. Framing materials are usually wood, engineered wood, or structural steel.The alternative to framed construction is generally called mass wall construction, where horizontal layers of stacked materials such as log building, masonry, rammed earth, adobe, etc. The corners of the wood have to be soft. Typical questions asked about products: Hard to beat Doug Fir or SYP. Douglas Fir. The maximum load capacity of the wood table is about 150 lbs. Douglas Fir. Coast Douglas Fir Pseudotsuga menziesii var. That allows less wood to do the work. Our millworks can manufacture Douglas Fir products for you like mouldings, paneling, or whatever you can dream up. Western red cedar is soft and one of the most aromatic woods. It is common to classify wood as either softwood or menziesii) Rocky Mountain Douglas-fir (Pseudotsuga menziesii var. Initially, the wood must be quickly treated with a preservative.

Because it is strong, it has a great joist distance span. Because it is strong, it has a great joist distance span. Wood is a porous and fibrous structural tissue found in the stems and roots of trees and other woody plants. The average amount of weight that we use to keep on a desk is only about 15 lbs. We carry an extensive inventory of mouldings in both hard and soft wood, MDF, Fingerjoint, and can even custom Mill profiles to match existing finishes.

We carry an extensive inventory of mouldings in both hard and soft wood, MDF, Fingerjoint, and can even custom Mill profiles to match existing finishes. (68kg). WOOD SPECIES: RATING: SOFT TO HARD: Douglas Fir: 660: Southern. We offer several types of marine grade plywood, from medium grade, general use Douglas Fir to top of the line 100% Okoume and Sapele plywood. Despite the fir name, Douglas fir is not a true fir tree. Large, hard-to-reach windows such as skylight s or bay windo ws cost more. Douglas Fir Wood. Hard Wood versus Soft Wood has more to do with the seeds of the Wood than the actual hardness. As with all our products, J. Gibson McIlvain strives to provide a higher quality. Western red cedar is soft and one of the most aromatic woods. Our beautiful 10,000 Sq. Ask the First Question. The average amount of weight that we use to keep on a desk is only about 15 lbs. Hard Wood versus Soft Wood has more to do with the seeds of the Wood than the actual hardness. Initially, the wood must be quickly treated with a preservative. The Douglas fir (Pseudotsuga menziesii) is an evergreen conifer species in the pine family, Pinaceae.It is native to western North America and is also known as Douglas-fir, Douglas spruce, Oregon pine, and Columbian pine. Drilling is a cutting process that uses a drill bit to cut a hole of circular cross-section in solid materials. The Journal Our primary talents may lie in creating fine wood floors, but we at Ted Todd also love to tell stories. Here in our Ted Todd Blog youll find tales of development and inspiration, stories about the different woods we use and how we sourced them and tips and ideas to make your wood floor shine, no matter the setting. Prices for basic Douglas fir trim range from $1.75 to $3 in interior spaces and $2.50 to $4 on the exterior. US Wood Screws - Pilot Holes - Hard wood and soft wood pilot holes, shank clearance holes and countersink diameters. WEIGHT: 5.5 lbs per B.F. WORKABILITY: Very Hard will dull blades and tools Douglas Fir Wood. Accepts stains, glues, and finishes well.

Coast Douglas-fir (Pseudotsuga menziesii var. WEIGHT: 5.5 lbs per B.F. WORKABILITY: Very Hard will dull blades and tools Identifying mahogany is a little easy. x 12 ft. #2 and Better Prime Douglas Fir Lumber Pound for pound, Douglas fir is one of the Pound for pound, Douglas fir is one of the strongest western soft woods. The majority of douglas-fir available for purchase is for building and framing. Drilling is a cutting process that uses a drill bit to cut a hole of circular cross-section in solid materials. Identifying mahogany is a little easy. Although classified as a soft wood Siberian Larch is one of the hardest soft woods around, it is a hard-wearing tough timber which can be left untreated to naturally age (grey/Silver). We offer several types of marine grade plywood, from medium grade, general use Douglas Fir to top of the line 100% Okoume and Sapele plywood. The Journal Our primary talents may lie in creating fine wood floors, but we at Ted Todd also love to tell stories. Douglas-fir, interior north: Pseudotsuga menziesii: 2.7: 600: Spanish-cedar: Cedrela spp. menziesii), Rocky Mountain Douglas-fir (P. menziesii var. Coast Douglas-fir (Pseudotsuga menziesii var. The mortise and tenon joint is an ancient joint dating back 7,000 years. We offer several types of marine grade plywood, from medium grade, general use Douglas Fir to top of the line 100% Okoume and Sapele plywood. Large, hard-to-reach windows such as skylight s or bay windo ws cost more. Preservation of hem-fir is difficult. The best indicator of mahogany is the dark fine lines to the grain. Since the Douglas fir is rigid and sturdy, it can be used for a variety of purposes. Most wood types are perfect for exterior columns as long as they can support roof weight, consist of good quality wood grades, and have an aesthetic look and style. That allows less wood to do the work. Mortise and tenon joints have also been found joining the wooden planks of the "Khufu ship", a 43.6 m (143 ft) long vessel sealed into a pit in the Giza pyramid complex of the Fourth Dynasty The mortise and tenon joint is an ancient joint dating back 7,000 years. x 8 in. Preservation of hem-fir is difficult. But thats just a quick glimpse.

Workability: Typically machines well, but has a moderate blunting effect on cutters. menziesii: Green 450 26.1 53 Hard versus soft. Wood - Compressive Strength vs. Moisture Content - Red Spruce, Longleaf Pine and Douglas Fir - moisture content and their compressive strength. Wood - Compressive Strength vs. Moisture Content - Red Spruce, Longleaf Pine and Douglas Fir - moisture content and their compressive strength. The average amount of weight that we use to keep on a desk is only about 15 lbs. 2 in. But thats just a quick glimpse. Hard Wood versus Soft Wood has more to do with the seeds of the Wood than the actual hardness. The mortise and tenon joint is an ancient joint dating back 7,000 years. US Wood Screws - Pilot Holes - Hard wood and soft wood pilot holes, shank clearance holes and countersink diameters. We carry a wide range of rough sawn sizes in typical 4/4 and 8/4 lumber and supply it kiln dried or radio frequency kiln dried for a 100% dry large timber. Wood - Compressive Strength vs. Moisture Content - Red Spruce, Longleaf Pine and Douglas Fir - moisture content and their compressive strength. US Wood Screws - Nominal Sizes - Wood screws - nominal sizes vs. diameters. The grain has to be long and also fine. menziesii: Green 450 26.1 53 Hard versus soft. American Douglas Fir softwood is a light brown to a reddish brown colour with few knots and is harder and more durable than its European Douglas cousin. Odor: Has a distinct, resinous odor when being worked. Douglas-Fir: Pseudotsuga menziesii: 7.07: Tamarack: Larix larcina: 7.07: Goncalo Alves: Astronium graveolens: 7.05: What is needed is wood that is HARD to bend and hard to break. The maximum load capacity of the wood table is about 150 lbs. Wood is a better choice to reduce the emission of greenhouse gases, air and water pollution, and other impacts.Steel and concrete as the most consumed building materials use 12% and 20% more energy and emit 15% and 29% more greenhouse gases. If a painted solid color is what you want in a deck, you can choose a wood like hem-fir. It works okay enough for construction purposes. Birch, Mahogany, White or red oak, Poplar, Cherry, Maple, Redwood, Cedar, Douglas fir, Yellow pine, Spruce are the best wood for exterior columns. Workability: Typically machines well, but has a moderate blunting effect on cutters. Accepts stains, glues, and finishes well. We carry an extensive inventory of mouldings in both hard and soft wood, MDF, Fingerjoint, and can even custom Mill profiles to match existing finishes. The main differences between hardwoods and softwoods is that the structure of hardwoods lack resin canals, whereas softwoods lack pores (though not all softwoods have resin canals). Preservation of hem-fir is difficult. glauca) and Mexican Most wood types are perfect for exterior columns as long as they can support roof weight, consist of good quality wood grades, and have an aesthetic look and style. The main differences between hardwoods and softwoods is that the structure of hardwoods lack resin canals, whereas softwoods lack pores (though not all softwoods have resin canals). But using it for making benches or other utilities is a big no. 3. In general, a wood table is well enough to bear any load, because it is actually difficult to Typical questions asked about products: Hard to beat Doug Fir or SYP. (68kg). Wood Vendors offers multiple thicknesses of Hard Maple Lumber as well as ripped or s4s dimensional maple and Hard Maple Mouldings. Mahogany is hard. Our millworks can manufacture Douglas Fir products for you like mouldings, paneling, or whatever you can dream up. It is common to classify wood as either softwood or

In general, a wood table is well enough to bear any load, because it is actually difficult to Mortise and tenon joints have also been found joining the wooden planks of the "Khufu ship", a 43.6 m (143 ft) long vessel sealed into a pit in the Giza pyramid complex of the Fourth Dynasty LibriVox is a hope, an experiment, and a question: can the net harness a bunch of volunteers to help bring books in the public domain to life through podcasting? Coast Douglas-fir (Pseudotsuga menziesii var. Framing materials are usually wood, engineered wood, or structural steel.The alternative to framed construction is generally called mass wall construction, where horizontal layers of stacked materials such as log building, masonry, rammed earth, adobe, etc. Balsa seems soft but is technically a Hardwood. As with all our products, J. Gibson McIlvain strives to provide a higher quality. Advantages of Wood. Our beautiful 10,000 Sq. The corners of the wood have to be soft. The first examples, tusked joints, were found in a well near Leipzig the world's oldest intact wooden architecture. Framing, in construction, is the fitting together of pieces to give a structure support and shape. Because it is strong, it has a great joist distance span. The plywood core will vary depending on the quality of the panel but will usually be Douglas Fir, Meranti, or Okoume. The best indicator of mahogany is the dark fine lines to the grain. Douglas-fir, interior north: Pseudotsuga menziesii: 2.7: 600: Spanish-cedar: Cedrela spp. These were nice clean 2x4x16's. We carry a wide range of rough sawn sizes in typical 4/4 and 8/4 lumber and supply it kiln dried or radio frequency kiln dried for a 100% dry large timber. WOOD SPECIES: RATING: SOFT TO HARD: Douglas Fir: 660: Southern. Coast Douglas Fir Pseudotsuga menziesii var. Birch, Mahogany, White or red oak, Poplar, Cherry, Maple, Redwood, Cedar, Douglas fir, Yellow pine, Spruce are the best wood for exterior columns. are used without framing. Large, hard-to-reach windows such as skylight s or bay windo ws cost more. Wood is a better choice to reduce the emission of greenhouse gases, air and water pollution, and other impacts.Steel and concrete as the most consumed building materials use 12% and 20% more energy and emit 15% and 29% more greenhouse gases. Here in our Ted Todd Blog youll find tales of development and inspiration, stories about the different woods we use and how we sourced them and tips and ideas to make your wood floor shine, no matter the setting. Western red cedar is soft and one of the most aromatic woods. There are three varieties: coast Douglas-fir (P. menziesii var. Crack Resistance glauca) Indian mahogany, chickrassy, chittagong wood (Chukrasia velutina) Spanish Cedar, cedro, Brazilian mahogany (Cedrela odorata) Hard maple Sugar maple (Acer saccharum) Black maple (Acer nigrum) Soft maple The plywood core will vary depending on the quality of the panel but will usually be Douglas Fir, Meranti, or Okoume. Manufacturer Warranty: See store for details: Questions & Answers. The grain has to be long and also fine. Our beautiful 10,000 Sq. Their use also releases 10% and 12% more pollutants into the air and generates 300% and 225% Initially, the wood must be quickly treated with a preservative. Since the Douglas fir is rigid and sturdy, it can be used for a variety of purposes. Their use also releases 10% and 12% more pollutants into the air and generates 300% and 225% The corners of the wood have to be soft. If it is not, then it is a veener. The majority of douglas-fir available for purchase is for building and framing. If it is not, then it is a veener. Call Tom Or Pat at 877.983.6367 to discuss your Hard Maple needs. Wood putty, also called plastic wood, is a substance used to fill imperfections, such as nail holes, in wood prior to finishing.It is often composed of wood dust combined with a binder that dries and a diluent (thinner), and, sometimes, pigment.Pore fillers used for large flat surfaces such as floors or table tops generally contain silica instead of or in addition to wood dust. glauca) and Mexican