I've been approached buy a firm I used to sub to to fit out new builds with ufh. Amtico sig ground floor all by the kitchens which are ceramic and we're in debate at the min whether to keep the ufh on low whilst installing. Me personally have never bothered but I hear some are fitting with it on very low... What's your thoughts guys? All anhydrite floors been down min 4mths (So they say) but had Laitance removed and force dried during these months. Readings after 3 days are sitting at around 68 - 72 and the company are suggesting primed then uzin150 the lot. I've always dpm'd as a precaution whether it's 2 coat roll system or epoxy. The prices are very good but it's not all about how much you can earn.
I think off is better due to rapid curing of adhesives which could affect the bond strength as wont soak into the subfloor enough before it sets Not what you want when the heating is wacked up If there’s no source of heat I put my box heater on
Did one last week and had ufh set at 12degrees 48hrs before /during/after and floor was still cold and didn’t seem to effect adhesive working time imo
Problem is ufh is so inconsistent. Ufh is meant to be off but the room temp needs to be 15 degree minimum. A box Heater will warm the room but won’t warm a freezing cold slab in winter that’s had no heating on for 48 hrs. So as soon as the heating goes off you need another source of heat. Not easy when you have to screed. Sent from my iPhone using Tapatalk
Keep it on low. People turn off the UFH and the problem is the slab temp drops. With traditional central heating, we have it running in winter and the slab absorbs some of the heat. It will sit at around 16-18c. In summer central heating goes off and the slab is kept warm by the summer air. Average 18+. With UFH the slab average temp through winter is around 25-27c. In summer when UFH is off it drops down to 18c. If you turn it off, the slab temp will drop lower than normal. It will drop down very low unless you add heaters to the room. Fan heaters are not too clever as the blow the heat across the subfloor causing hot spots. Gas heaters are not good either as they produce high humidity that condensates on the cold concrete. You could use oil filled rads, these produce loads of heat next to them and will heat area if you have enough of them. But in reality, you are trying to heat the air and the slab. If you leave the UFH running on low (14-16c) you are stopping the slab from getting too cold. You will still need a secondary heat source tho for the area as the UFH will not heat the air at 14-16c. Well, it will, but you won't get any higher than the 16c it's giving out, in fact, you will get maybe 14c air temp.
Hmmm...I'm thinking I may try the low degrees setting and have a few redrads with me. Just checking through the email they sent me after our meeting and it states no skirts to be fitted before flooring - added bonus. Does this mean I finally get to use my hook blade
Burnt the last one out, just managed to break into my 2nd loaf aswell Maybe use my welder but it stinks need to scrape off all the karndean off it again from the last set of bogs I was doing! [Damn you pedestals]
