15mm Marble How Many Kgs?

[On one]

I went to look at a job last night......24m2 of 400mm x 400mm x 15mm marble on various substrates,non of which would take that amount of weight.
I didn't get a conversation with the customer regarding the weight issues as she was busy dealing with other trades when I left the property.
So to preempt the expected conversation and to have my facts right...... how heavy is 15mm marble?
Has anyone had to answer a similar question

 

[White Room]

About 32kg m2....20mm is about 35kg.

 

[On one]

I had it down for more than that.
Just querying your maths Whitebeam......
if 15mm = 32kg m2 and 20mm is 33% more volume than 15mm,20mm should be 43kgs m2 maybe??

 

[White Room]

Be honest I took the weights from a another site....

 

[On one]

Whatever it is,it's too heavy for a 100yr+ old skimmed solid wall

 

[On one]

What weight will a Marmox/wedi type board hold if it is fixed with adh and mechanically fixed?

 

[White Room]

60kg allegedly

Whatever it is,it's too heavy for a 100yr+ old skimmed solid wall

That'll be lime mortar...

 

[On one]

Mmm

 

[Old Mod]

I went to look at a job last night......24m2 of 400mm x 400mm x 15mm marble on various substrates,non of which would take that amount of weight.
I didn't get a conversation with the customer regarding the weight issues as she was busy dealing with other trades when I left the property.
So to preempt the expected conversation and to have my facts right...... how heavy is 15mm marble?
Has anyone had to answer a similar question

About 38kg m2 + approx 4kg m2 adhesive & grout.
So I'd guess 45kg m2 Wrighty.

 

[On one]

Not my problem anymore!
I was too expensive!