The National Roofing Contractors Association (NRCA) says it has received more than 6,000 complaints about contractors’ practices over the last 12 months.
NRCA has launched an investigation into its contractors.
The union says its members have been subject to harassment and intimidation by contractors.
A company spokeswoman said: “We will be conducting a thorough investigation into the issues raised by NRCA and we will be taking appropriate action.”
The NRCA’s complaints are being taken seriously, the spokeswoman said.
However, it added that a number of contractors are not properly licensed and that they are not responsible for the work that they perform.
Contractors and their unions say they are the victims of “inappropriate and excessive” behaviour, but the NRCA says its own members have suffered the same.
The National Association of Contractors (NAAC) said: The NRAC has received an unprecedented number of complaints about the behaviour of some contractors, and it is investigating the allegations.
We are deeply concerned by the behaviour and intimidation of contractors in the past 12 months, particularly the incidents in the West Midlands.
It is unacceptable and unacceptable for people to have been subjected to the abuse, intimidation and bullying of a small number of individuals who are not professional, competent and responsible workers.
A number of workers have been injured, some seriously.
The company said it is working with its workers to ensure safety and respect for all people involved in the supply of the building and building systems.
NRAC president Paul Smith said: As we’ve seen over the past several years, there are significant issues that need to be addressed and we are doing everything possible to ensure that the safety of our members is paramount.
The National Residential Roofing Association (NRSRA) has also received complaints, saying the problems were exacerbated by a lack of safety standards. “
Our members have every right to complain about the conduct of their colleagues, as we all know there are no easy answers when it comes to these kinds of situations.”
The National Residential Roofing Association (NRSRA) has also received complaints, saying the problems were exacerbated by a lack of safety standards.
The association says its membership has been affected by the same issues.
A spokesman for the organisation said: We have received several complaints regarding contractor behaviour in the last twelve months.
We have not been able to establish the cause of the issues but we will investigate these issues thoroughly and ensure we have a safe working environment for our members.
The NRCA said it has also been targeted by the contractor’s unions, and has received a number, but it has no comment at this time.
It has also come under fire from the building industry, with the Building Construction Federation (BCF) saying the NRAC and the NRMA were engaging in a “totally wrong” strategy of targeting the industry.
The BCF says it is concerned that contractors and their union have a “deep-rooted anti-building attitude”.
It said: Many of the concerns raised by the NRDA and the NRCAs are directly relevant to the safety and wellbeing of building workers.
We believe that the NCA’s policy is wrong, unfair and unlawful, and that it should be changed.