Joined: Mar. 2019
||Posted: 23 Mar. 2019,18:39
Really appreciate all the advice here from experts and DIYers on here. Through reading this site and forum posts, I've successfully laid 32 m2 of 900x600x25mm flamed silver (sesame) granite slabs in my shaded back patio. I've followed all the rules so far, minimum 75mm sub base, 30mm full mortar bed, albeit 5:1, not recommended 6:1, but it still seems permeable. Slurry render on the back of the flags before laying and it's looking good so far.
But now I don't want to mess it all up doing the sealing and jointing wrong and would really appreciate your advice. I laid it in October, almost 6 months ago and left it to release effervescence, but there's been none. I'm planning for spring/summer seal and joint. I want to use a basalt colour for jointing, but I'm terrified about messing it up with picture framing and can't bare to use a sweep in jointing compound that might stick in the rough surface of the slabs even if sealed, so was thinking....
1) An impregnating sealer first (Adseal HD Sealant or Lithofin MN StainStop Plus?). Want to guard against grout picture framing/staining, but also red leaf and red berry staining. Invisible sealer as I don't want the slab colour to change.
2) A polymeric jointing compound, but piped in using a gun, still using lots of water? Joints are 10mm wide and 20 to 30mm deep. I'm not worried how long it takes, just want a neat job with least chance of staining. Which product? I don't think I could work fast enough for a 2 part product, unless I swept in, eek.
I'd really appreciate anyone's thoughts on this, as I understand with silver granite it's vital to get jointing and sealing products that are compatible with the stone.
Thanks & Regards,