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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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a moron's question: Do we really need a screed?
Screeds, what are they for? They provide:
A nice and flat surface Impermeable (not that much) hard-wearing So? There are boards used for UFH (and similar products) which offer just that...only, they are 10mm thick. Having removed the screed from a partially screeded bathroom I'm just wondering if it would be better to use the limited height available for insulation rather than a screed - let's say, I'd lay a 50mm slab of Jablite or similar on top of the concrete slab, then an hard wearing 10mm boards to accommodate the UFH and then I'm left with about 12mm for the tiles. The lot would cover the available thickess of 70mm. Any problem? |
#2
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a moron's question: Do we really need a screed?
On Thursday, October 25, 2012 11:54:24 AM UTC+1, wrote:
Screeds, what are they for? They provide: A nice and flat surface Impermeable (not that much) hard-wearing + a stiff, non-flexible, surface So? There are boards used for UFH (and similar products) which offer just that...only, they are 10mm thick. Having removed the screed from a partially screeded bathroom I'm just wondering if it would be better to use the limited height available for insulation rather than a screed - let's say, I'd lay a 50mm slab of Jablite or similar on top of the concrete slab, then an hard wearing 10mm boards to accommodate the UFH and then I'm left with about 12mm for the tiles. The lot would cover the available thickess of 70mm. If you're starting with a concrete slab, I think that should be OK. (An expert will be along shortly to explain why that is wrong) Any problem? Can't see any. |
#3
Posted to uk.d-i-y
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a moron's question: Do we really need a screed?
On Thursday, October 25, 2012 11:54:24 AM UTC+1, wrote:
Screeds, what are they for? They provide: A nice and flat surface Impermeable (not that much) hard-wearing So? There are boards used for UFH (and similar products) which offer just that...only, they are 10mm thick. Having removed the screed from a partially screeded bathroom I'm just wondering if it would be better to use the limited height available for insulation rather than a screed - let's say, I'd lay a 50mm slab of Jablite or similar on top of the concrete slab, then an hard wearing 10mm boards to accommodate the UFH and then I'm left with about 12mm for the tiles. The lot would cover the available thickess of 70mm. Any problem? If the surface is rough, you've got concentrated point loads, resulting in the insulation sinking much more easily. I don't know if its worth putting a little self levelling down first just to stop that NT |
#4
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a moron's question: Do we really need a screed?
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#5
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a moron's question: Do we really need a screed?
On Thursday, 25 October 2012 20:06:18 UTC+1, Phil L wrote:
swimmydeepo wrote: Screeds, what are they for? They provide: A nice and flat surface Impermeable (not that much) hard-wearing So? There are boards used for UFH (and similar products) which offer just that...only, they are 10mm thick. Having removed the screed from a partially screeded bathroom I'm just wondering if it would be better to use the limited height available for insulation rather than a screed - let's say, I'd lay a 50mm slab of Jablite or similar on top of the concrete slab, then an hard wearing 10mm boards to accommodate the UFH and then I'm left with about 12mm for the tiles. The lot would cover the available thickess of 70mm. Any problem? You can tile over wood, provided it is securely fastened down, EG, plywood screwed over floorboards in an upstairs bathroom, that is to say, you can't just tile over the floorboards because they move individually, hence the plywood sheet. Your proposed floor will essentially be floating, and if it's tiled, it will crack up in no time I don't get this...you are talking of floorboards while my floor is basically a concrete slab (at this stage) laid on top of some hardcore over ground (so more stable than a suspended floor). Just as I'm getting more info about screeding...I'm puzzled by the many variants available; more strikingly, some recommend a watery kind of mix while others opt for a near dry mixture?! Can anyone shed some light on this contrasting views? Were those comments addressing leveling compound v proper screed without realizing the difference? Then, there is another question related to the thickness needed for electric heating cables (7mm thick) - some recommend a fairly thick screed (at least 65mm) to be laid on top of the cables while others say that the screed should be thin (25mm above cables so 35mm should do nice) so that the heating time is shortened - to me the latter seems the obvious choice (and quite handy too as there is no much height available). |
#6
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a moron's question: Do we really need a screed?
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#7
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a moron's question: Do we really need a screed?
But you are talking about laying tiles on 10mm boards over jablite, and I said they won't last five minutes. I don't know the difference between the Jablite boards and these: http://www.bathroom2u.com/varme-unde...0mm-p-515.html but that sort of boards (there are many similar in the market) might represent just what I needed...at least from the way the product is described - in fact it would make it much easier as I can just laid them on top of the concrete slab, fix the heating cable on top and then tile over (in the original idea I would had to use a slab of Jablite and then a 10mm board + UFH cables and tiles on top). How about that? |
#8
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a moron's question: Do we really need a screed?
On Friday, 26 October 2012 21:20:52 UTC+1, wrote:
But you are talking about laying tiles on 10mm boards over jablite, and I said they won't last five minutes. I don't know the difference between the Jablite boards and these: http://www.bathroom2u.com/varme-unde...0mm-p-515.html but that sort of boards (there are many similar in the market) might represent just what I needed...at least from the way the product is described - in fact it would make it much easier as I can just laid them on top of the concrete slab, fix the heating cable on top and then tile over (in the original idea I would had to use a slab of Jablite and then a 10mm board + UFH cables and tiles on top). How about that? Well...another link to reinforce my point: http://www.warmfloorsonline.com/unde...lation-faq.htm The final part of the second paragraph (FAQ 2) states that: "The 50mm boards are very popular in new conservatories & extensions where they effectively replace the top screed." Indeed, who need a bxxxxy screed then? |
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