High strength wooden loft ladder (180kg per tread and 420kg/m2 overall load rating)
Highly insulated trap door for excellent energy efficiency (U value of 0.60W/m2K)
Trapdoor features 6-point locking mechanism for an airtight seal
WDL sealing an insulation tape for an airtight seal with the building
Available in Passivhaus version with secondary upper hatch (U value of 0.29 W/m2K)