This 24 x 136 mm profile is called BASIC and it is the most affordable larch decking from a proven source. We supply in a combined grading of A/B/C in a 50%:30%:20% ratio.
By purchasing this material you must expect occasional occurance of edge knots, but these do not affect the functionality of the decking.
The 40 x 60 mm profile can be used as a base joist in the galvanised version (glued with D4 exterior adhesive) and you get the whole decking structure at an exceptionally affordable price.
Sapwood is yellowish white, heartwood is reddish brown to dark reddish brown, and often darkens further. Typical characteristics of Czech larch include a tendency to leak out resin. Larch is particularly sensitive to iron, and to avoid rust spots, it is recommended to use fasteners only made of stainless steel.
Wood density: approx. 550 kg/m3
Artificially dried: 16-18%
Recommended dilatation between boards in installation:5 - 7 mm
Face side = reeded