DPM under Beam and Block Floor

[iMCaan]

Hi

 

I know from the Beam and Block plans that DPM needs to be placed under the concrete beams on the ground floor. From YouTube videos I thought DPM is placed on a 10mm mortar bed.

 

However, a subcontractor has suggested you don't have to put 10mm mortar bed under DPM. Is this true? What which be better, with or without the 10mm bed?

 

Thanks

 

 

 

[nod]

It is

I simply laid 600 mil dmp around the block Then folded it over the ends of the BB floor and taped it under my firs course of block 

[Russell griffiths]

No bed, it wouldn’t be strong enough to take the point load of the beams. 

Just roll out dpc and put beams on top. 

[Simplysimon]

your bc allowed you to put beams on the ground! you lucky git. we had 'it's got to have 150mm min below'

[PeterW]

17 minutes ago, Simplysimon said:

your bc allowed you to put beams on the ground! you lucky git. we had 'it's got to have 150mm min below'

Think he means ground floor beam and block not onto the ground. 
 

3 hours ago, nod said:

It is

I simply laid 600 mil dmp around the block Then folded it over the ends of the BB floor and taped it under my firs course of block 

 

+1 to this - depending on your floor thickness you may get away with 450mm but you can always cut the excess off 

[Simplysimon]

so for dpm read dpc? shouldn't need a dpm under a b&b floor unless it's in the solum

[iMCaan]

Thank you all

 

That clears that up. No mortar below DPM on the end of BB.

 

@Simplysimon sorry, I'm not a builder (or a DIYer) so I may wording may have caused the confusion.

 

There's a void below BB

 

Thank you again