This is the top favourite among our patterns. LDC ALTA has a concealed mounting, which gives your facade or project a smooth look. This pattern can be fire-retardant treated with the 100% natural fire-retardant Burnblock® to the desired reaction to fire class. LDCwood® ThermoWood® Spruce has a smooth and even structure with smaller knots than Pine. Thermo-D Spruce is ‘centre cut’, the best quality, which ensures a stable and shape-retaining plank. Thermo-D Spruce from LDCwood® is always FSC®or PEFC certified. Smooth connections and loyal partnerships with the sawmills help to ensure a low ecological footprint.