Glulam Specification

Specification

Species:	Whitewood
Grade:	C24
Laminated:	Horizontally
Laminations:	45mm multiples
Bonding:	MuF Cascomin
Weight:	450kg/m³
Finish:	Clean Planed

Permissible Stresses

Based on:	SS grade Red/Whitewood
to:	BS5268 : Part 2 : 1991
at:	18% moisture content or below
for:	Long and medium term duration

Bending Parallel To Grain

f:	7.5 N/mm²
x K3:	Load dur. (1.0 long/1.25 med.)
x K7:	Beam depth factor
x K15:	No. of laminations

Modulus of Elasticity

E:	10500 N/mm²
x K20:	1.05 for C24 grade
	11,025 N/mm²

Compression Perp To Grain (Bearing)

c,adm:	2.1 N/mm²
x K3:	Load dur. (1.0 long/1.25 med.)
x K18:	1.33 (no wane)
	2.79 N/mm² long, 3.49 N/mm² med.

Bearing Lengths

For the above the maximum load on a typical 100mm long support would be:

Beam Breadth	Long Term (floor) kN	Medium Term (roof) kN
65	18.13	22.66
90	25.11	31.38
115	32.08	40.10
140	39.06	48.82
165	46.03	57.54
190	53.01	66.26
215	59.98	74.98

For higher loads the bearing length should be increased pro-rata. Whilst this can be achieved with a steel spreader plate care should be taken to ensure adequate crushing capacity in the supporting masonry.

Return To The Top