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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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First foray into SBR screed
Hi,
Me and the chap working for me got down 10m2 of screed yesterday, nominal 20-25mm thick. More specifically, he laid, I mixed. One of his many skills and I was fussy the mix was done exactly to the datasheet. I went for the full monty - SBR+water sealer coat, then SBR screed laid on a wet SBR/cement bonding coat. Hopefully that will *not* be falling off. 2 curing days under polythene then a week to dry then it's ready for the next layer. At least 2 rooms should now have level floors... His comment was, that it worked pretty much like normal screed, apart from being thin. Latex levelling gunge next. Cheers Tim |
#2
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First foray into SBR screed
Tim S coughed up some electrons that declared:
Hi, Me and the chap working for me got down 10m2 of screed yesterday, nominal 20-25mm thick. More specifically, he laid, I mixed. One of his many skills and I was fussy the mix was done exactly to the datasheet. OK. Time to say "bah". Checked it today - and despite all the major efforts to rail the room with battens to allow the tamping bars to have a point of reference, we got some lumps. I think it was because the screed was a lot dryer than I was expecting (no capacity to flow) although the mix was absolutely by the book. Luckily I checked today, before the screed has fully cured and dried to cast-iron mode, so we managed to knock the high spots off with a bit of scraping and light use of an SDS + scutch comb. On the plus side, the screed is *extremely* well attached to the base. It's not falling off, ever. The guide rails did at least prevent overall errors in the level. We now have a generally flat and level floor with some hollows (2mm). Oh well - referring to the Latex screed thread, time to bang a bag of F Ball over it. Decided I don't like subfloor work - it's crappy and difficult. On the plus side, drains are coming on nicely! Cheers Tim |
#3
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First foray into SBR screed
On 4 June, 19:34, Tim S wrote:
Tim S coughed up some electrons that declared: Hi, Me and the chap working for me got down 10m2 of screed yesterday, nominal 20-25mm thick. More specifically, he laid, I mixed. One of his many skills and I was fussy the mix was done exactly to the datasheet. OK. Time to say "bah". Checked it today - and despite all the major efforts to rail the room with battens to allow the tamping bars to have a point of reference, we got some lumps. I think it was because the screed was a lot dryer than I was expecting (no capacity to flow) although the mix was absolutely by the book. Luckily I checked today, before the screed has fully cured and dried to cast-iron mode, so we managed to knock the high spots off with a bit of scraping and light use of an SDS + scutch comb. On the plus side, the screed is *extremely* well attached to the base. It's not falling off, ever. The guide rails did at least prevent overall errors in the level. We now have a generally flat and level floor with some hollows (2mm). Oh well - referring to the Latex screed thread, time to bang a bag of F Ball over it. Decided I don't like subfloor work - it's crappy and difficult. On the plus side, drains are coming on nicely! Cheers Tim Get the Stopgap 300, they have many other types, but that's the most self-levelling. Use the max amount of water (5.675l from memory) - the water is critical, it sounds faintly ridiculous but the difference between the standard amount (5.5l) and the max is very obvious. It levels better if you go for a bit more than the min 3mm layer on average, as 3mm on average will be thin on the high spots. A pin leveller or wiper blade will help spread the stuff evenly if it is a big area, but are a bit of an investment (£50-70) for a one off (try Refina tools if you want to go that route) - I made a pin leveller from a plaster's darby - drilled and tapped the stiffening braces on the back of it to take some M5 bolts, which set the height above screed to 4mm, and screwed a handle to it. That spreads about the right amount roughly evenly around the floor as you go, from where it will level. You'll need a trowel to push it into corners. Speed is everything - being two people will help, one mixing and pouring, the other spreading. Don't try and mix it all first, there isn't enough time (unless it's only two bags or something). Oh and shade the room if it is hot, I think I said that before. |
#4
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First foray into SBR screed
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#5
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First foray into SBR screed
On 5 June, 20:17, Tim S wrote:
Indeed - 20-30 mins working time - I read the datasheet. Big pinch of salt needed at least at this time of year! 10/15 mins, and feels like much less.... Good luck, it is amazing stuff. |
#6
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First foray into SBR screed
On 5 June, 23:33, wrote:
On 5 June, 20:17, Tim S wrote: Indeed - 20-30 mins working time - I read the datasheet. Big pinch of salt needed at least at this time of year! 10/15 mins, and feels like much less.... Good luck, it is amazing stuff. If you get it right... which I didn't first time round. Which is the reason for the advice, I'd rather my second-time lucky gives you a first time lucky! Fill 4 buckets with the right amount of mix water in advance. Cut all the bags open first - they have built in spouty bits which pull out like a nozzle so you add it steadily to the water - didn't work for me as I was trying to empty while holding the other end of the bag between my legs and sds in the other hand, but if you have both hands as a bag pourer it might work better. Then pourer can go and spread while mixer mixes for the rest of the 2 mins. Some of the advice I've seena round suggests leaving the mix for 5 mins and remixing - I had better results not doing that and just pouring it straight after the first mix. Speed, speed, speed,and more speed. |
#7
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First foray into SBR screed
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#8
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First foray into SBR screed
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#9
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First foray into SBR screed
Tim S coughed up some electrons that declared:
Anyway, an extra bag tomorrow will make the bathroom perfect (I'm sure of that). The other room has such localised problems it would be a waster to repour the whole room when I should be able to patch correct it. And it did. The high spot must have been quite high, as it still pokes its little head up a bit, but only to the tune of a couple of mm over about 4x4". If I cared, I'd grind it back with an angle grinder - but the tile adhesive will have no trouble with such a minor bump. Having a generally flat floor is what counts. And the rest of the floor is mm perfect. Where I had some let-by through an opening - this time I siliconed the wooden dam in place and filled the hollow and feathered it in. That worked. I'm tempted to throw 3-4 bags of this stuff down the hall as it will sort of the area where a wall was removed and it changes from screed to quarry tiles, the latter of which have a slump in one corner. Have to dam 5 doors though! Cheers Tim |
#10
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First foray into SBR screed
On 12 June, 21:46, Tim S wrote:
coughed up some electrons that declared: Get the Stopgap 300, they have many other types, but that's the most self-levelling. *Use the max amount of water (5.675l from memory) - the water is critical, it sounds faintly ridiculous but the difference between the standard amount (5.5l) and the max is very obvious. *It levels better if you go for a bit more than the min 3mm layer on average, as 3mm on average will be thin on the high spots. Did it today. Bloody hell - that stuff is *good*. Glad it worked out. Done the cempolatex stuff yet? Comparison? |
#11
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First foray into SBR screed
Bolted coughed up some electrons that declared:
On 12 June, 21:46, Tim S wrote: coughed up some electrons that declared: Get the Stopgap 300, they have many other types, but that's the most self-levelling. *Use the max amount of water (5.675l from memory) - the water is critical, it sounds faintly ridiculous but the difference between the standard amount (5.5l) and the max is very obvious. *It levels better if you go for a bit more than the min 3mm layer on average, as 3mm on average will be thin on the high spots. Did it today. Bloody hell - that stuff is *good*. Glad it worked out. Yes. The only issues I seemed to have were if there was a pronounced lump in the surface being covered. In a couple of places, the Stopgap seemed to ride up over the lump and stay there. We're only talking 1-2mm bulges in *very* small localised areas. Probably the effect of the stickiness and viscosity of the liquid - once it was up there, it couldn't flow down well enough. Is there a stock solution to this? One might be to use twice as much Stopgap in a single pour. Another might be to not push it over the high bits but let it creep up the sides as far as it wants... Done the cempolatex stuff yet? Comparison? No - that's next week, hopefully. This week was putting bricks in all the holes in daughter's bedroom (old kitchen, *many* vents), prepping to install door frames, plumbing and making a brick pit for the water joint outside. Cheers Tim |
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