3 . 1
TYPES OF MASS TIMBER
CLT
Mass timber is the name given to types of engineered timber that can be used as structural building materials. Mass timber components are made from small planks or layers of timber bonded together to increase their strength and form load-bearing components such as panels, beams and columns. This Guidebook focuses on three most commonly used types of mass timber. Cross laminated timber Cross laminated timber (CLT) is manufactured by combining multiple layers, or lamella, of timber with abutting layers stacked such that the grain orientation alternates 90°. CLT is commonly used for floor structures and walls. Glulam Glulam, also referred to as GLT, is similar to CLT in that layers of timber are combined; however glulam differs from CLT in that all layers have the same grain orientation. Glulam is commonly used in applications where a large span is required, such as roof joists, beams, and columns. Laminated veneer lumber Laminated veneer lumber (LVL) is again constructed similarly to the aforementioned types of engineered timber, being made up of multiple layers. However, LVL is manufactured from considerably thinner layers frequently under 3mm in thickness. LVL is commonly used for similar applications as Glulam. Types of adhesive Typically melamine or polyurethane based adhesives are used in the manufacture of engineered timber products, which may lose adhesion at different temperatures. Non heat-resistant adhesives are common for low risk buildings where fire will not affect the bond line. Heat-resistant adhesives maintain bond integrity during fire and are best suited for higher-risk buildings where auto-extinction is necessary.
Glulam
LVL
Figure: The three main types of mass timber
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TIMBER OFFICES
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