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The default CLT materials and their design properties are per CSA O86 Tables 8.1 and 8.2. It is also possible to create custom CLT materials using Database Editor.
Sizer also includes proprietary CLT materials. from Element5 and KLH.
Species
The Species input in Sizer corresponds to the species composing the primary CLT grades given in Table 8.1.
Note that all these species correspond to grades with both the transverse and longitudinal layers the same. When making a custom CLT database file with grades of different species, you could create a new species called e.g. S-P-F/Northern.
Grades
These are the designations E1, E2, E3, V1, and V2 listed as primary CLT grades in Table 8.2, but are technically CLT grades and appear as such in the CLT grading stamp. They specify the species and grade of lumber used in the alternating transverse and longitudinal CLT layers.
The letter E designates the use of MSR lumber; V designates visually-graded lumber.
The numbers 1, 2 and 3 designate S-P-F, D.Fir-L, and Northern species.
Sizes
All sections are assumed to be 12" or 1 m wide, corresponding to the arbitrary design width with unit system you are employing.
The depths are the actual and nominal panel depth in inches. For the standard CLT database, these sizes are the same, although the nominal depth is expressed in fractional format and the actual depth in decimal.
The depths are from the following sources:
PRG 320
The sections in PRG 320 Annex A Table A2:
4-1/8", 6-7/8", and 9-5/8" (105, 175, and 245 mm) depths composed of 1-3/8" layers throughout.
Manufacturers Sizes
The following sizes produced by major CLT manufacturers are also included to provide a larger array of default choices:
3-7/16", 5-1/2", 7-9/16", and 9-5/8" ( 87, 139, 191, and 243 mm) composed of 1-3/8" longitudinal layers and 0.67" transverse layers.
12-3/8" (315 mm) composed of 1-3/8" layers throughout.
Please note that the strength properties for these sizes do not correspond to those from any manufacturer; they are the strength properties for the CSA O86 grades.,
Layers
The CLT specification includes the number of layers and the thickness of transverse and longitudinal layers. Neither Database Editor nor Sizer verifies that the thicknesses of the layers sum to the panel thickness; it is your responsibility to ensure the data entered are consistent.
There is also an option to have two parallel layers consecutively as the outermost layers at each side of the panel for extra strength in longitudinal loading.