Our Story

WISAblock is a safe, efficient and cost-effective way of protecting against impalement and the threat of other serious injury posed by exposed, or poorly protected steel starter bars on concrete substructures.

Alternative to mushroom safety caps

Providing an alternative to traditional mushroom style safety caps and featuring an internationally patented clamp design, WISAblock supports standard timber 4×2 and creates a means of guarding above reinforced steel 10mm – 32mm rebar sizes thus reducing the risk of impalement.

Best practice

The product has already been given best practice status by Kier Group , Morgan Sindall, Balfour Beatty, RG Carters and Newall Civil Engineering. It has been used on Skanska Stockholm construction sites and been of interest to the Wheatstone Project in Western Australia since launching in April 2014.

Safety is at the heart of our product

With construction site safety standards constantly under review, innovation moving forward and in light of four recent impalement incidents on UK construction sites, companies are becoming increasingly motivated to provide a duty of care under HASAWA 1974. It is clear that there is a growing requirement to improve site safety regarding the installation of steel concrete reinforcement and it seems that more and more sites are looking to provide an anti implement method of protection on their sites.

Everyone knows accidents happen on site, but using WISAblock provides piece of mind to construction companies, site managers and operatives alike. Due to its unique design, ease of application and reasonable cost WISAblock provides not only reliable, but a reasonably practicable solution for everyone involved.

About Us

Myself and business partner Ian Martin are both former site managers. We started developing WISAblock in 2013 after Ian was closely involved in a colleague being impaled on five reinforced steel starter bars, fortunately surviving the incident however causing serious implications in the aftermath of the incident.

Some time later during work together on a local project and both unimpressed by existing standard systems and being unable to source an alternative product for the UK market, we set about designing our own system with the aid of a local plastics manufacturer. Our design brief was that it would have to reduce the risk of impalement, secure reliably avoiding the need for constant re-application and was cost effective to allow general use for all construction companies, not only across the construction industry within the UK but globally.

We would be delighted for you to experience the unique benefits of WISAblock yourself.


Warren Green Director WISA Ltd and WISAblock

Warren Green Director

Five years experience as Carillion Site Manager on HV Major Projects

Currently promoting the anti impalement benefits of WISAblock UK and internationally.

Qualified NEBOSH CITB Safety Plus Construction Trainer, Safety Advisor and NVQ Assessor.

HNC Mechatronics

Registered Company Address

Bankside 300, Broadland Business Park, Peachman Way, Norwich NR7 0LB