Mass Timber Self-weight Calculator

This calculator computes the self-weight of a mass timber panel, useful for when the value is not provided by the CLT or glulam manufacturer. Units are in the imperial system. 
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CalculationInputs﻿﻿G
:0.42​
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﻿﻿MC
:12%​
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﻿﻿t
:6.875 in​
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Outputs﻿﻿rho
:0.45​
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﻿﻿SW
:16.09 lb / ft^2​
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EquationsThe equation for ﻿ρ
 (rho) is given by:
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ρ=G1+G(0.9)MC(1+MC)\rho = \dfrac{G}{1 + G (0.9) MC} \left(1 + MC\right)ρ=1+G(0.9)MCG​(1+MC)
﻿﻿G
 is the specific gravity of a wood species (unitless)
👉See Table 4A of NDS Supplement notes for values of G based on your wood species
﻿﻿MC
 is the in-service moisture content of the CLT panel, commonly taken as ﻿12%
 for mass timber members (unitless). Note, remember to input the MC as a decimal in the above equation, e.g. ﻿0.12
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👉See Table 4-2 of USFS Wood Handbook for information the ﻿MC
 of wood
﻿﻿ρ
 is the specific gravity of the CLT panel, modified to account for the presence of water (unitless)
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The equation for self-weight of the CLT panel is:
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SW=SGw×rho×tSW = SG_w \times rho \times tSW=SGw​×rho×t
﻿﻿SGw​
 is the density of water, taken as ﻿62.4 Ib/ft3
 
﻿﻿t
 is the thickness of the CLT panel, in feet ﻿(ft)
. Note, the calculator converts the thickness from inches to feet automatically in Python.
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Related ResourcesTimber Screwed Joint Designer to AS 1720.1
Timber Nailed Joint Designer to AS 1720.1
Timber Beam Calculator to AS1720.1
Timber Column Calculator to AS1720.1
Timber Beam Calculator to EC5
Check out our full library of CalcTree templates here!
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