Help needed to work out how many rolls I need please

Hi everybody,

I'm really sorry but I was wondering if you guys could help me find out how many rolls of foam/rubber matting I need to put under my artificial grass.

My gardens dimensions are:

Length 515cm
Width 512cm


Each rolls dimensions are:-

3 meters length
1.2 meters wide

Please could you show me the formula you used the work your answer out please.

Kind regards

Shiv

 

Garden = 5.12 x 5.15 = 26.37 m2
Rolls = 3 x 1.20 = 3.60m2 per roll
Rolls required = 26.37 ÷ 3.60 = 7.325 so 8 rolls required

 

After doing the above calcs (I was in a car park waiting for wife & daughter to finish shopping) I would normally also check out how it practically works out cutting rolls/sheets/etc. I always put the smallest pieces in the middle (less chance of shifting than at edges?) so did this to show how 8 rolls would work



If laid the other way round it would reduce the narrow strip by 30mm to 320mm wide, but if you wanted to avoid narrow strips, the 350 wide row could be increased to max. 600mm (half a roll width) and the adjacent row reduced to 950mm wide - there's sufficient material with 8 rolls to do this.