Restricted ventilation and high humidity can lead to a condition of ‘dry rot’. Even when moisture levels within the wood are lowered the decay can still remain unless treated. Dry rot can cast easily from one part to the next and in older properties it can spread through porous masonry materials. Although the rot cannot significantly damage the masonry, once the rot is through it can then affect timber in other parts of the building. Red dust and cubical cracking are the signs of infestation. As with wet rot, eradication requires specialist remedial treatment.