Technical Resources
Specs, fire ratings & sizing.
Panel properties, fire-resistance ratings, and how we size a panel to your span. Figures are preliminary and will be confirmed at Canadian Construction Materials Centre (CCMC) evaluation.
Sizing
Tell us the span. We’ll tell you the depth.
How far a DLT panel spans is not one number. It moves with panel depth, the load it carries, the deflection limit the project works to, whether the panel runs continuous over an intermediate support, and — on floors — whether footfall vibration governs before deflection does. A published table has to guess at all five. We would rather ask.
What sets the span
Depth
2×4 to 2×12 lamella, 89 to 286 mm. The biggest lever by a wide margin.
Load
Roof snow for your location including drift, or floor live load for the actual occupancy.
Deflection and vibration
The limit the project is designed to. On floors, vibration often governs a long span before deflection does.
Continuity
A panel that runs continuous over an intermediate support reaches meaningfully further than one stopping at each end.
Send us five things and we’ll come back with a depth
Grid and support spacing
Roof or floor, and the occupancy
Location, for snow load
Whether the soffit is exposed
Any depth or build-up constraint you’re working to
Early-stage sizing is quick and free — most come back the same day. We would rather help you land on the right depth than have you design to a table.
Full span tables, engineer-confirmed on a CSA O86 basis, will be published as soon as they are ready.
Fire Performance
Fire-resistance ratings.
Assembly
Char Rate
Sacrificial Depth
Fire-Resistance Rating
2×6 exposed (140 mm)
0.80 mm/min
55 mm
60 min
2×8 exposed (184 mm)
0.80 mm/min
79 mm
90 min
2×12 exposed (286 mm)
0.80 mm/min
103 mm
120 min
2×12 + ⅝-inch (15.9 mm) Type X gypsum board
Protected
—
160 min
Calculated per the CSA O86 zero-strength-layer method: char at 0.80 mm/min, the CSA O86 rate for mechanically laminated timber, plus a 7 mm zero-strength layer. Each ⅝-inch Type X gypsum layer adds 40 minutes. Rated floors and roofs also need a protective top layer, such as plywood, OSB or a concrete topping. Preliminary: residual section capacity must be confirmed by project engineering for the project’s loads.
Physical Properties
Panel specifications.
Property
Value
Lamella species
SPF (spruce-pine-fir), No.2 & Better
Dowel species
Hard maple
Maximum panel width
12 ft (3,660 mm)
Maximum panel length
60 ft (18,288 mm)
Panel depth range
3½ – 11¼ in (89 – 286 mm) · 2×4 to 2×12 lamella
Mean density
≈ 470 kg/m³
Service moisture content
12% ± 2%
Specified bending strength (fb)
11.8 MPa · CSA O86
Thermal conductivity
0.12 W/m·K
Reaction to fire
Exposed mass timber, no coatings
Typical values for Engrained DLT. Final certified values will be published following Canadian Construction Materials Centre (CCMC) evaluation.
Documentation
Get the full documentation pack.
The full panel spec sheet and our fire-resistance calculations — sent to your inbox. You’ll also be first to know at CCMC evaluation and production launch.
Panel spec sheet
Included · PDF
Fire-resistance calculations
Included · PDF
Sizing enquiry
Same-day response
Get Started
Specifying DLT on a project?
Send us your loads, spans, and fire requirements — we’ll return sized options and the supporting documentation.