Pietra Serena Sandstone 800x800mm help

[Mark D'ARCY]

Stuart have you Screeder the floor yet

 

[Mark D'ARCY]

Timeless John I was giving advice not belittling people.

 

[J Sid]

get a good blade for your eBay wet cutter and that would be fine.

Apple store tiles, I know them. Did a nice patio in them a few year ago. Laid in rapid cement based adhesive on a screed. Was back there yesterday doing a shower and still looks good, if not in need of a clean.

setting out looks good. Expansion joints?

 

[Stuart_AC]

Hi Mark,
Not screeded. The floor has been power floated and is level. The biggest undulation is 4mm over a 3m straight edge so I think it's good enough to tile directly on to.

 

[Mark D'ARCY]

Stuart you would be easier doing it in sand and cement .lay as you have already set it out. Lay your first course all the way through the building then come off it simple. Lay all the full stones first then cut in after.

 

[Mark D'ARCY]

Sorry Stuart read that wrong so you don't kneed to screed

 

[Stuart_AC]

I have a nagging doubt about the control joints... the slab doesn't have any. It's a Passive House with an unusual foundation slab (which I'll not go into now) but effectively the slab can move at the entire perimeter due to the way the insulation is designed. As a result engineer saw no need for movement joints.

Now for the tiles I plan to use one of the flexible adhesives. Being a passive house there will be a consistent 21 degree temperature so there will be little variance in air temperature. However, that said there's lots of south facing glass meaning that the floor will heat up. The building is just over 7m wide so the tiles can expand into the perimeter under the skirting (the walls have 47mm service battens so there's loads of space under the skirting). As a result I don't need anything across the width of the building. However, the building is 25m long so I might put a movement joint where the tiles pass into the hallway from the kitchen.

 

[Stuart_AC]

Hi Mark,
Thanks for the comments.. I would have been reluctant to use sand and cement as the drying time is so long. From what I've been told you have to leave it up to a month before sealing etc... Unfortunately I don't have that long as we're in a caravan and about to have a baby in 6 weeks!

But as I'm always specifying other jobs I'd like to hear more.. are you laying with sand cement and sealing quickly without issues?

 

[Mark D'ARCY]

I have a nagging doubt about the control joints... the slab doesn't have any. It's a Passive House with an unusual foundation slab (which I'll not go into now) but effectively the slab can move at the entire perimeter due to the way the insulation is designed. As a result engineer saw no need for movement joints.

Now for the tiles I plan to use one of the flexible adhesives. Being a passive house there will be a consistent 21 degree temperature so there will be little variance in air temperature. However, that said there's lots of south facing glass meaning that the floor will heat up. The building is just over 7m wide so the tiles can expand into the perimeter under the skirting (the walls have 47mm service battens so there's loads of space under the skirting). As a result I don't need anything across the width of the building. However, the building is 25m long so I might put a movement joint where the tiles pass into the hallway from the kitchen.

Need expansion every 6 to 10 metres

 

[Mark D'ARCY]

Hi Mark,
Thanks for the comments.. I would have been reluctant to use sand and cement as the drying time is so long. From what I've been told you have to leave it up to a month before sealing etc... Unfortunately I don't have that long as we're in a caravan and about to have a baby in 6 weeks!

But as I'm always specifying other jobs I'd like to hear more.. are you laying with sand cement and sealing quickly without issues?

We use ardex a38 in the screed can be sealed after 2 days