How Many Roof Tiles Do I Need?

[Leon 96]

Hi all,

Hope you're all keeping well. Also hoping, I could get some help if possible.

 

I'm looking to place an order for some reclaimed roof tiles in readiness for a roof replacement on my barn as part of its conversion to a residential dwelling. I could use some help figuring out an approximate number of tiles I'd need to order.

 

I'm looking to use Rosemary clay tiles which are  265mm x 165mm. 60 tiles per m². I know I'll need eaves tiles and tile and a half's too but for now I'm looking to get the bulk of it ordered. 

 

The part of the roof I'm looking to replace are elevations 4, 5 and 6. I have attached reference images of the roof and measurements (in green) which I took myself using the 1:50 scale from the drawing. 

Is there any info I'm missing?

Thanks all

[Mr Punter]

I would get an online estimation firm to do the take off and quants.