Weight of flat roof per sq meter?

Hi

Does anyone have any rough weights per sq meter of what the typical flat roofing materials might weigh?

wooden T&g boarded deck and 3or4 layers of ash felt roofing?

Thanks

 

I'll take a wild guess at 15kg?

 

Been google'ing and found this

http://www.engineeringtoolbox.com/roofing-materials-weight-d_1498.html

 

Good find although I have no clue abouts pounds and ounces. What does that equate to in Kg?

 

Also googled this!

http://www.onlineconversion.com/

looks like about 5kg per sq meter.

 

I wish it was 15kg.

 

Well theory is of then a bit off!

Stripped the flat roof today and thought this weighed a bit more than 5kg per sq m.

SO got the bathroom scales out, weighed my self, then weighed me + as much as I could hold.

Did this for all of the roof and it came out at 40Kg per sq m.



Which I am very pleased about for another job I am doing!!!