Glulam in low-rise houses
|Rafter, along length of ridge, two supporting posts.
Rafters, transverse, two supports.
|Floor joists, single span, two supports.|
|Rafters, two lengthways, two supporting posts. Rafters, transverse, two supports.||Lintel over door or window opening in external wall..|
|Rafter, along length of ridge, three supporting posts. Rafters, transverse, two supports.||Terrace – rafters, floor joists, binders and posts.|
Glulam in larger buildings
|Straight beam on posts 10–30 m.||Curved beam on posts 10 - 20 m.|
|Pitched beam on posts 10 - 30 m.||Boomerang beam on posts 10 - 30 m.|
|Tied roof truss on posts 15 - 40 m.||Three-point portal with finger-jointed haunches 15 - 25 m.|
|Strutted three-point portal 15 - 30 m.||Three-point portal with curved haunches 10 - 50 m.|
|Three-point tied arch on posts 20 - 60 m.||Truss 30–80 m (straight or curved).|
The best way to achieve a lasting structure is to employ design details that keep the glulam free from moisture. End-grain wood surfaces should be protected against moisture penetration when in contact with damp material such as concrete. Here are a few examples of designs for post supports and protruding beam ends.
|Two examples of moisture-resistant post support designs. Cast steel plate (left), post base (right), used to underpin glulam posts for verandas and carports.|
|Example: Damp-proof design for protruding glulam beam|