Coming from north west of america, douglas fir is often used for reaforestation in france and in europe. Apa 1981 and represent a consensus opinion of the makers, sellers, and users of plywood. Comparative strength properties of woods grown in the united states by l. We offer douglas fir plywood in quartered vertical grain. The tree itself grows to be very large, and yields a large amount of usable lumber and veneer for plywood. Variability, or variation in properties, is common to all materials. Douglas fir is an evergreen common in many forested areas, and the plywood. Douglas fir plywood sheet goods douglas fir works well with machines, but has a moderate blunting effect on cutters. D fir species is known for their high performance against strong forces against harsh natural elements from winds, storms to earthquakes. Familiarity with physical properties is important because those properties can significantly influence the performance and strength of wood used in structural applications. Up until the ice age a related sort was widespread throughout europe, but only the american relative survived. Roof, wall and floor sheathing for strength and durability. Ponderosa pine, lodgepole pine, douglas fir, western larch, engleman spruce and grand fir.
Because wood is a natural material and the tree is subject to many constantly changing influences such as. Slow growth inland douglas fir yields finegrained, smooth faces. Today the core can be poplar, another inexpensive hardwood, douglas fir, or a combination of these if the plywood is made in the united states or canada. It is designed for floors, decks, walkways, portable staging and other areas that require a slip resistant surface.
Reference design values for visually graded timbers, decking, and some species and grades of dimension lumber are based on pro visions of astm standard d 24506 2011 establishing structural grades and related allowable properties for. Structural properties of a woodframe wall construction. Pdf effect of fireretardant treatment and redrying on the. The veneer grading is the same as with ac, where d permits knots up to 212 inches wide, and splits and repairs are noticeable. Contact us for our great pricing, let us work for you to make sure you get exactly what you need. Superior exterior plywood made only with douglasfir or. Know that wider boards expand and contract more than narrower ones. Coming from north west of america, douglas fir is often used for reaforestation in.
Appearance, acoustical qualities, and interior design versatility have made wood surfaces highly desired by architects, designers, and building ocupants. Douglas fir commercial availability douglas fir is marketed predominantly as douglas fir larch in structural grades according to national lumber grades authority nlga rules for dimension lumber. In strength properties other than shock resistance and hardness, it is stronger than most mainland woods of comparable density tables 1 and 4. Dca1 flame spread performance of wood products used for. Mechanical properties of clear straightgrained wood 426 natural characteristics affecting mechanical properties 427 specific gravity 427 knots 427. Controlling the entire process, from log to finished product, allows us to customize your product at a competitive price. Winandy and others published effect of fireretardant treatment and redrying on the mechanical properties of douglasfir and aspen plywood find, read and cite all the. Apa 000 ps 109 58 cat specially designed plywood panel made only with douglas fir or western larch, and highly restrictive limitations on core gaps and.
Exterior grade douglas fir plywood core fiberglass reinforced kraftfoil scrim backer or primed textured aluminum backer standard in. Mechanical properties of wood forest products laboratory. This plywood slows the spread of flames and reduces smoke. In 1828 seeds were brought to europe by the scottish researcher david douglas. We produce douglas fir, white fir, and pine veneer in 4, 8, 9 and 10foot lengths, with most of the veneer then used in our softwood plywood and hardwood plywood plants in oregon. Ab marine grade douglas fir plywood untreated designed for rigorous marine use. Specialty inhouse grades, and export grades are also. The face of the panel is manufactured using a select douglas fir veneer that is excellent for further finishing. Pressure treated bc or stk cc grade douglas fir is great for use under carpeting where rot and. Marine plywood is available in the following grades. In the manufacturing of plywood, a log is turned on a lathe and a long knife blade peels the veneer. Firepro fire retardant treated plywood is available in douglas fir.
Properties for visually graded dimension lumber from. The group number appearing in an apa trademark is based. Plywood has been one of the most recognized and trusted wood building products for decades. Apa 1981 and represent a consensus opinion of the makers, sellers, and users of plywood products as well as other concerned parties. Physical and mechanical properties are based on mature heartwood specimens. Table 1 provides maximum loads and spans which modify the untreated panel spans for roof applications by thickness and construction. Roughtop is high quality douglas fir plywood with a textured, skid resistant, overlay face and a smooth surfaced overlay back.
Douglas fir is technically not a true fir abies genus, but is in its own genus. Both faces are smooth with no open knots on either side. The test panels were cut from commercially manufactured 4 by 4foot aspen plywood and 4 by 8foot douglas fir plywood. Choose the right plywood popular woodworking magazine.
Additional information on wood properties and characteristics is given in references listed at the end. Evaluation of rolling shear strength of plywood by flexural vibration. The douglas fir also accepts stains, glues, and finishes well. Douglas fir plywood dfp is a one piece rotary cut clear face veneer which gives it a wild and pronounce grain. Despite the name douglas fir, the tree is actually part of the hemlock family. Construction name, address, and telephone of the responsible party company manufacturer. Departmentofcommerce building materials and structures reportbms30 structuralpropertiesofa woodframewallconstruction sponsoredbythe douglasfirplywoodassociation by herbertl. Properties for visually graded dimension lumber from ingrade tests of fullsize specimens. Douglas fir is a shadeintolerant species, which selfprunes its lower limbs. Department of agriculture step 1measure the boards width. Selecting optional components may alter these properties.
Douglas fir siding combines strength and durability with a natural wood ppearance. Jan 25, 2019 twentyfive years ago, if you bought a piece of birch plywood, or any other hardwood plywood for that matter, the core would be birch. Manufacturers shave thin wood layers, called veneers, from logs. Plywood always has an odd number of layers, each one consisting of one or more plies, or veneers. Aa marine grade douglas fir plywood question they are little splits in the surface about 1 or 2 long that just wont fill with paint or varnish. Mechanical properties strength robusta is a very strong wood. Ab marine grade douglas fir plywood is frequently used for lapstrakes and hull planking on wood boats.
Properties of european planted trees young and with a rapid growth which are mentionned in this sheet are different from those of the oregon pine old and with a slow growth coming from its original growing area. This means fewer knots, and long stretches of straight, consistent fibers. Ps 183 establishes requirements for producing, marketing and specifying construction and industrial plywood. Marinegrade plywood is a specially designed panel made of douglas fir or western larch, according to apa. Sheathing is manufactured according to the grade, veneer and panel thickness. Comparison of wood quality of douglas fir and spruce from. We use only the highest quality plywood for laminating to ensure a balanced and great looking product. Wood handbookchapter 4mechanical properties of wood. Identification all lumber and plywood treated with firepro fire. Kretschmann contents orthotropic nature of wood 41 elastic properties 42 modulus of elasticity 42 poissons ratio 42 modulus of rigidity 43 strength properties 43 common properties 43 less common properties 424 vibration properties. Manufactured from thin sheets of crosslaminated veneer and bonded under heat and pressure with strong adhesives, plywood panels have superior dimensional stability and an excellent strengthtoweight ratio and are highly resistant to impacts, chemicals. Kretschmann, research general engineer 51 the mechanical properties presented in this chapter were obtained from tests of pieces of wood termed clear and straight grained because they did not contain characteristics such as knots, cross grain, checks, and splits.
Index numbers table 1 provide a convenient means of comparing properties of the various species. Roseburgs sheathing panels are especially designed for engineered applications such as structural components where design properties including tension, compression, shear, crosspanel flexural properties and nail holding and bearing are of significant importance. Even when constantly exposed to heat and moisture, such as in saunas, hemlocks retain their smooth texture and stability. Douglas fir, southern pine or yellow poplar first veneer from logs is usually not continuous due to taper psl uses waste product from veneer, plywood and lvl mills veneer put through clipper and trimmer to make long strands needed for psl strands approx 20mm wide, 4 mm thick and up to 1 m long. Establishment o f the plywood fabricator service, an a f f i l i a t e o f the. Structural properties of laminated douglas fir epoxy. A textured, skid resistant douglas fir panel for floors. Douglasfirplywood eighthedition commercialstandardcs4548 supersedescs4547 effectivedatefornewproductionfromnovemberi,1948 arecordedvoluntarystandard ofthetrade. Vertical grain doug fir plywood has coloring that is pale yellow to a reddish golden light brown. Douglas fir trees, when you see them growing on the lush mountainsides of the pacific northwest, may strike you for their towering expanses of limbfree trunks. Douglasfirplywood eighthedition commercialstandardcs4548 supersedescs4547 effectivedatefornewproductionfromnovemberi,1948 arecordedvoluntarystandard. Gibson mcilvain has gone through in our decadelong relationship with carrying softwoods, weve come to understand the up sides and down sides of using douglas fir.
These species are divided according to strength and stiffness properties into five groups. Effect of fireretardant treatment and redrying on the. Plywood grades and specifications home guides sf gate. In many species of softwood, such as douglasfir and southern pine, there is a marked con. Markwabdt, assistant in charge, section of timber mechanics, forest products laboratory.
Structural plywood is usually a lower grade of plywood cd. Group 1 species are the strongest and stiffest, group 2 the next strongest and stiffest, and so on. These standards have evolved over time from earlier documents ohalloran 1979, 1980. It is composed of thin sheets of veneer, or plies, arranged in layers to form a panel. The interior layers also have voids, or holes, that you cant see until you cut into the plywood panel. Douglasfir the wood database lumber identification. Price per sheet 1 to 5 sheets see below for quantity discounts. With the exception of plyron and some apa performance rated panels, all of the other plywood grades described in this guide are produced under the provisions of u. Two species douglas fir and aspen of 58inchthick, fiveply, ac exteriorgrade plywood were evaluated. Spera lewis research center cleveland, ohio jack b. Fir pine douglas fir, hemlock, pine, white fir, wood species balsam, larch, etc.
As part of timber products commitment to sustainable forestry, 100% of the log is used during the and after the peeling process. If you need sizes or grades of vertical grain doug fir plywood that we dont. Standard plywood is made with fewer, thicker layers and mostly contains softwood, like pine or douglas fir. Lewis research center group cleveland, ohio meade gougeon and michael d. Specifications and mill capabilities we manufacture plywood products to various grades, dimensions and performance standards appropriate for a wide range of customer enduses. Douglas fir is the most widely used wood for building and construction. Mechanical properties of wood civil and environmental engineering. As a result, wood possesses material properties that may be.
A fiberglass reinforced kraftfoil scrim backer is added for panel balance and acts as a moisture barrier. Vertical grain doug fir plywood cherokee wood products. We manufacture plywood products to various grades, dimensions and performance standards appropriate for a wide range of customer enduses. It is an incredibly valuable commercial timber, widely used in construction and building purposes. Douglas fir hardwood plywood plywood supplier edensaw woods.
The inner core of the panel is made from strong western softwood eneer and is fully water resistant. Effect of fireretardant treatment and redrying on the mechanical properties of douglasfir and aspen plywood j. This system is designed for use as interior cladding on walls in cleanroom type applications. Please select one of the grades listed below to learn more, or select mill capabilities to. For each species, we selected 280 12 by 24inch panels with no visible defects. Pdf properties of douglasfir and aspen plywood jerrold. We use mainly inland douglas fir and western larch due to their ability to produce fine grain and smooth faces. Plywood made from douglas fir is a softwood plywood typically sold in 4by8 panels of varying thickness. Evaluating the flexural properties of fireretardant treated softwood plywood exposed to elevated temperatures astm d5664 standard test method for. Intended use of the product use of the substancemixture. Plywood is a versatile wood product with applications ranging from woodworking to home building. Wood and woodbased products are widely used as interior wall, ceiling, and floor surfaces in all types of buildings.
When properly dried, hemlocks provide extremely stable lumber that resists checking or twisting. Apa 000 ps 109 58 cat specially designed plywood panel made only with douglasfir or western larch, and highly restrictive limitations on core gaps and face repairs. Product standard ps 183 may be made from over 70 species of wood. Sanded plywood table 1 continued apa marine typical trademark marine aa ext 0. Douglas fir is an evergreen common in many forested areas, and the plywood made from it is. Structural properties of laminated douglas fir epoxy composite material david a. Plywood plywood is the original wood structural panel.
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