Around 1870, during the reign of William III, King of the Netherlands, the first cast-iron lighthouse was built. The tower, which is more than 45 metres high, consists of 1088 cast-iron plates that are connected with rivets. At that time it was the highest cast-iron tower in Europe.
However, the nasty Dutch weather caused problems within a short time already. Water seeped into the tower through the joints, causing severe cracking in the floors. As a result, the tower was no longer accessible for the public.
Our sister company I.E.C.R.T. Engineering Office BV conducted a detailed investigation of the Lange Jan lighthouse and submitted a report of their inspection. In consultation with the commissioning party, Jahn International was called in to compose a special pointing mortar. The tailor-made material is available now and can be supplied on request. The restoration, i.e. sealing the outside of the tower against water, has not been carried out yet.