Thu, 07 May 2026 16:35:00 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9964&Focus=164407#Comment_164407 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9964&Focus=164407#Comment_164407 Sun, 06 Jan 2013 17:03:05 +0000 rangichangisam
Does anyone have any experience of making something up themselves or know what goes in to the flexible grout that you pay so much for? I'm assuming it is just latex with some sort of fine aggregate added but have no real experience- any ideas very much appreciated.
Cheers,
Bob]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9964&Focus=164408#Comment_164408 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9964&Focus=164408#Comment_164408 Sun, 06 Jan 2013 17:44:26 +0000 tony https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9964&Focus=164411#Comment_164411 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9964&Focus=164411#Comment_164411 Sun, 06 Jan 2013 18:05:18 +0000 jamesingram Mix of plastering sand and soft could give you a gritter mix.

Seen some tilers just add PVA to water/grout mix and claim it's flexible , though i've got some doubts about that.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9964&Focus=164415#Comment_164415 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9964&Focus=164415#Comment_164415 Sun, 06 Jan 2013 18:30:03 +0000 jamesingram SBR bond (any brand) is offered as a cheaper alternative to GT1 on tilers forum.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9964&Focus=164418#Comment_164418 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9964&Focus=164418#Comment_164418 Sun, 06 Jan 2013 18:58:12 +0000 owlman https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9964&Focus=164423#Comment_164423 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9964&Focus=164423#Comment_164423 Sun, 06 Jan 2013 19:17:55 +0000 rangichangisam Tony- I considered grouting in lime as it is 'flexible' but then came to the conclusion that the 'flexible' referred to when building in lime is different to the kind of flexibility that is required for floor grout with UFH- namely when a wall built with lime mortar moves the mortar cracks exposing previously unexposed lime to C02 which then makes it set again. With the UFH the flags and grout will be heating up and moving a couple of times a day and I'm not sure the lime would take it- please feel free to correct me if I'm wrong though!

Owlman- yes I think I will part fill the joints with something to take up the space

Jamesingram- many thanks, I think I'll investigate SBR more thoroughly, people had also advised me to just add PVA but I too had my doubts.

Many thanks and if anyone else has any bright ideas please feel free to keep contributing!]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9964&Focus=164428#Comment_164428 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9964&Focus=164428#Comment_164428 Sun, 06 Jan 2013 20:44:33 +0000 muddy https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9964&Focus=164446#Comment_164446 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9964&Focus=164446#Comment_164446 Mon, 07 Jan 2013 09:18:20 +0000 RobinB
Not expensive and does what it says. Slows drying a bit which could be good or bad. We have UFH but under tiles.

Paid about £12 locally but have seen it at up to £20 for 5 liters.

data sheet here

http://www.ibcltd.net/datasheets/SBR%20TDS.pdf

No connection with the company]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9964&Focus=164460#Comment_164460 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9964&Focus=164460#Comment_164460 Mon, 07 Jan 2013 12:31:35 +0000 nikhoward
Could you do a few trial mixes in a corner/under a kitchen cupboards/fridge/etc, where if it cracks it will not be obvious, then when you have a result, do the whole floor]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9964&Focus=164492#Comment_164492 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9964&Focus=164492#Comment_164492 Mon, 07 Jan 2013 20:57:53 +0000 jolly-green-giant https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9964&Focus=164499#Comment_164499 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9964&Focus=164499#Comment_164499 Mon, 07 Jan 2013 21:13:05 +0000 SteamyTea Posted By: jolly-green-giantWell the Romans had under floor heating and there where no chemical additivesThey had the same number of chemicals, just less compounds, but I know what you mean

Clear flexible acrylic sheet is made from ordinary cast acrylic with ground up rubber in it. The particles of rubber have a diameter that is less than a wavelength of light. Not sure if you can easily buy the ground rubber, but would think that it would work as an additive.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9964&Focus=164520#Comment_164520 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9964&Focus=164520#Comment_164520 Tue, 08 Jan 2013 08:45:44 +0000 owlman

Or how about fibreglass fibres as an additive ST ?? Or........

http://www.claytek.com.au/Admixs
]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9964&Focus=164540#Comment_164540 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9964&Focus=164540#Comment_164540 Tue, 08 Jan 2013 12:06:02 +0000 Roger https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9964&Focus=164571#Comment_164571 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9964&Focus=164571#Comment_164571 Tue, 08 Jan 2013 20:58:19 +0000 Wilko https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9964&Focus=164594#Comment_164594 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9964&Focus=164594#Comment_164594 Wed, 09 Jan 2013 07:16:49 +0000 SteamyTea Posted By: owlmanOr how about fibreglass fibres as an additive ST ?? Or........

http://www.claytek.com.au/Admixs" >
I would not used chopped rovings (choppings as they are known as) as it would make for a furry finish.

There is a super flexible additive in that list, try one of them.]]>