If you have to heat your house like we do (in the Netherlands 55°North), I would suggest to make the distance between the tubes much smaller. This causes a lower required water temperature in the tubes. In that case your floor is ready for future use of a heatpump. Or if you heat with gas, the efficiency of your boiler is increasing, because of more condensation from vapour in the flue gass. I have 6" spacing (built in 1987) but with the heatpump we have since 6 years, I would have liked 4"spacing. Every °C that the water in the floorheating system can be reduced, gives me around 2,5% extra efficiency of the heatpump.....
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