Cavity Tray choice - reduced weight bearing

[newbridgewolf]

Construction: brick and block 200mm cavity.

 

We have not long installed the first floor joists but being advised to use a different cavity tray above the first floor windows.

 

We have installed Catnic Thermally Broken Lintels and used RIW Sheetseal 9000 at 600mm wide to form the cavity trays on the groundf floor windows .  These were a snug fit over the lintels.

 

However, for the first floor we have been advised that it’s best not to use the Sheetseal 9000 because of the 'reduced weight bearing' and look instead for a high bond DPC.

 

So now trying to source a good quality flexible DPC 600mm wide.

 

Would appreciate any suggestions.

 

The alternative is to consider pre-formed cavity trays if I can souce them for a cavity this size.

 

Many thanks

[nod]

The vast majority of new homes use dpc trays If they are installed correctly and kept clean They will work fine 

You could use a high load dpc if you are looking for extra strength and durability