大象传媒

Hundreds of new properties have been built using weak mortar that does not meet recommended industry standards, this programme has found.

There are reports of homes with the fault on at least 13 estates in the UK.

The full extent of the industry-wide problem is hard to measure as some homeowners have been asked to sign gagging orders to claim compensation.

The industry says mortar performance is a complex issue and can be affected by a number of factors.

Jim Reed reports.