Hey guys, Has anyone ever come across a pumped screed called ‘Excelio’? (see attached link) I’ve measured up a job today and this is down about 25mm thick encapsulating under floor heating. Now alarm bells are ringing cause it looks like a gypsum screed that needs grinding but the builder is telling me it doesn’t need to be.. as it’s a “new” screed, can anyone shed any light ? Many thanks https://www.gyvlon.co.uk/uploads/Document/excelio-technology-brochure.pdf Sent from my iPhone using Tapatalk
If you look at the link you've supplied it actually states at the bottom page 2 in the Technical Characteristics chart under substrate preparation "Mechanical Sanding"
Lol, these builders really take the piss. Say what ever they want to make their life easier. Wouldn’t listen to a word they say. It’s 95% bull that’s made up at the cafe Sent from my iPhone using Tapatalk
lol I know, don’t know why they insist its a new strain!! Nah mate haha Right ok so my procedure if I get the go ahead with the job.. would be.. Grind of Laitance (with copper sanding disk) Moisture test with digital box (<75%rh) Double Prime with P121 (dilute then neat) Screed? 1110, 1200, 300 Thoughts? Sent from my iPhone using Tapatalk
Tbh, ive worked for a firm who do this all day, every day. They don`t grind the floor, 1x coat of 121, then green bag. Thats there system, not mine, but in 1000`s of plots, I have only ever seen a few failures. Ive used lots different latex over it, and so long as its dry, and primed correctly, it should be ok
Builders will tell you Any thing Completley Grind off the laitance with a grinding machine or buffer with grinding disc and segments Then I'd be Prime 1-1 with Uzin 360 Then neat with Uzin 360 Uzin 110 screed
Thanks for the replies gents, in terms of moisture reading would that only work once Laitance has been removed? Sent from my iPhone using Tapatalk
Only way to test it over UFH is with a carbide bomb test You obviously can't drill probe holes in it and a box will probably brake with all the moisture that will be coming out after its been ground Grind it and get the UFH turned on and it should be dry in a week or two depending when it was layed It'll read dry on a scanner when is dry
It’s been down two weeks already but is only 25mm, ok so I’ll grind it, run the heating for a week or so and then test it with the box.. Sent from my iPhone using Tapatalk
Getting a reading from an Anhydrite screed is not as straight forward as a sand and cement floor. Ensure the underfloor heating has been commissioned and has been running then switched off prior to the installation. i.e. before any work takes place. This will aid with the drying of the screed and will ensure that post installation the UFH doesn't just drive the residual moisture into the flooring.
