Flagstone Joint filling

[Basecoat]

Hi All

My relation have had flags laid half today and half tomorrow area of 38Metre square. The flags are 600x600x50 with 8mm gap all around. What material should be used to fill the gaps to form water proof seal. Input will be grately appreciated.

 

[ColJack]

check in the garden section, someone asked a similar question regarding re-pointing his patio..

as I recall it was a 3-1 sand-cement mix made so that it was damp but not wet ( clumps when squeezed in hand but leaves no wet hands.. )

brush in and point using a stick / piece of hose / pointing tool or whatever you have handy..

if they are being laid by a contractor then they should point it up for them...