This is the top favourite among our patterns. LDC ALTA has a concealed mounting, which gives your façade 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® poplar has a smooth, even structure and is knot-free. Due to its light weight, Thermo-D poplar is easy to handle. Thermo-D poplar from LDCwood®, both European and North American, is always FSC® or PEFC certified.