I'm not sure how serious the damage actually is, but this is only the latest of a series of collapses within Pompeii of varying severity.
The House of Loreius Tiburtinus (otherwise known as the House of Octavius Quartio) is one of the best known houses in Pompeii. It had been substantially remodelled in the period before the eruption of Vesuvius in AD 79. The house is unusual for the amount of room dedicated to the garden. The house itself is relatively small in comparison. A triclinium and biclinium are positioned to allow diners to enjoy the visual axes created by two canals. The decoration of the house includes a painting of a priest of the cult of Isis.
Knowledge of the House of Loreius Tiburtinus is essential for students studying the OCR Classical Civilisation module on 'City Life in Roman Italy'.
You can see more images of the house here.