Featuring Plywood in Buildings - Engineered Wood Products ...

More documents

Recommendations

Info

Wall and Ceiling LiningsPlywoodSpeciesMinimumThickness (mm)GroupNo.Average SpecificExtinction Area(m 2 /kg)Pine, Radiata – Pinus Radiata 6mm or greater 3 < 250Lauan – Shorea agsaboensis 6mm or greater 3 < 250Pine, Hoop 6mm or greater 3 82.4Pine, Slash 6mm or greater 3 96.0Other MaterialsFace Veneer CommonNameBotanical NameSpread of FlameIndex (0-10)SmokeDeveloped Index(0-10)Klinkii pine Aurancaria hunsteinii 8 4Radiata Pine Pinus radiata 8 2Radiata Pine (scorchedand brushed surface)Pinus radiata 7 2Energy Costs of ConstructionPlywood is manufactured from a natural, renewable resource; wood. The energy requirements forthe manufacture of plywood are relatively low when compared to most other competitive buildingproducts. A comparison of processing energy used to manufacture cladding materials is provided intable 3Table 3: Process energy for various claddingsCladding MaterialProcessing Energy(mJ/m 2 )19mm timber weatherboards 9012mm plywood 114150mm concrete blocks 3000.6mm galvanised steel sheet 308100mm bricks 100010
Plywood Exterior CladdingPreservative treated structural or exteriorplywood applied direct to studs as exteriorcladding can provide a cost efficient,modern architectural look for the mostbasic or elaborate building project.Significant costs savings are possible if thecladding is structural plywood as it can alsoact as bracing to protect the structure fromwind and earthquake forces. In addition tobracing the structure, structural plywoodcladding provides tie down of the top plateto the bottom plate against wind uplift-refer to the EWPAA “Structural Plywood Wall Bracing Manual” for details, available from theEWPAA Web Site. Additional cost saving can be made with structural plywood clad framing fromeliminating the need to use a ribbon top plate to strengthen the top plate for trusses or rafters thatdon’t coincide with the stud location.Durability RequirementsThe two most important characteristics forguaranteed long term performance ofplywood as exterior cladding are treatmentagainst fungal and insect attack, and thepanel be manufactured with permanentType A bonds. The preservation treatmentshould be a minimum of hazard level H3“outdoors above ground” as defined byAS/NZS1604.3. The preservative treatmentcurrently available are Ruply andAmmoniacial Copper QuaternaryCompounds (ACQ) , veneer treatmentsystems, and a number of pressuretreatments for finished panels, includingCopper Chrome Arsenate (CCA) and LightOrganic Solvent Preservatives (LOSP) .Structural plywood to AS/NZS2269 has a Type A bond, and exterior plywood to AS/NZS2271 can beordered with Type A bonds. For maximum cost effectiveness it is good practice to use structuralplywood as a wall bracing as well as cladding.For maximum long term performance to exposed face of the plywood cladding should be finishedwith a water repellent or a 100% acrylic latex paint system. Additionally, the edges of the plywoodpanel should be sealed to minimise water uptake in the end grain. The edge sealing can be doneusing a water repellent or the same primer used on the face, and is most readily applied while theplywood is in a pack, before installation. Some plywood cladding products presently available in themarketplace have a machined or textured face veneer which provides a good surface to hold paint,11
Page 4 and 5: Face QualityPlywood can be ordered
Page 7 and 8: Curving PlywoodPlywood can be safel
Page 9: Lightweight panelsPlywood is strong
Page 13 and 14: It is essential in plywood cladding
Page 15 and 16: Corner Joint Details15
Page 17 and 18: Plywood Interior Wall & Ceiling Lin
Page 19 and 20: Bracing Resistance of Plywood Wall
Page 21 and 22: Table 8: Fixing of T&G Structural P
Page 23: EWPAA MembersPlywood and Laminated

Featuring Plywood in Buildings - Engineered Wood Products ...

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?