How the 2024 preformed cavity trays regulation change affects you

At the turn of the year, new regulations came into effect when it comes to preformed cavity trays that have made a few notable changes to how you operate – especially when it comes to DPC.

We understand that the reg changes can be confusing and it can be difficult to find a simple, easy-to-digest answer to what the changes actually mean.

In this article then, we will attempt to provide you with that, as we explore what the changes are and what they mean for you.

In a nutshell, what are the changes?


With NHBC chapter 6.1.17 in full effect from January 1, 2024, it is now required that preformed cavity trays are used for door thresholds, T-junctions, pitched roof abutments, interfaces with guarding, balcony supports, wind posts or guarding, steps in horizontal level, penetrations in horizontal cavity tray arrangements and both internal and external corners.

All of these have been listed as ‘complicated junctions’ by the NHBC and the new regulations state that these junctions need preformed cavity trays.

Why is this the case?


NHBC has stated that the changes “are part of an annual review to ensure NHBC Standards remain current and continue to help our registered builders to deliver the highest possible levels of quality, safety and comfort in new build homes.”

Can I still use DPC?


So, you can still use DPC if you need to make a horizontal straight and long tray run, but ultimately, you still need to use a preformed cavity tray for the changes of level, steps and both the internal and external angles.

How long that DPC roll can be is seen as ‘widely variable, according to Cavity Trays, who themselves are a cavity tray specialist.

Is it possible for me to see the full NHBC regulation?


Yes, it is – you can see the regulation in its entirety here.

Adapting to new methods


We appreciate that having to integrate new methods can prove tricky, as even with the advanced warning, change is still change after all.

However, we are hopeful that after reading this simplified explanation, you have a much clearer picture over the reg changes and how they impact you.

To find out more about Multifix and to see how we can help you, please get in touch with us. You can do so here.