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  • Silicone vs monocouche render
  • Premier Icon finbar
    Free Member

    *Shines @perchypanther signal into the sky*

    We need to get the side of our house re-rendered. It’s a massive (4 storey) gable end wall, old – 1911 – brick under existing crappy cement render. South west facing and high up so it gets loads of driving rain and wind.

    We’ve had two quotes from firms we like, one swears by Weber monocouche render and the other Johnstone’s silicone. Prices are close enough to make no difference.

    Any consensus on which is better from the STW hive mind please?

    Premier Icon BillMC
    Full Member

    I heard monocouche couldn’t be repaired whereas silicon can. I’ve just had silicon (bonding then fibreglass mesh plus primer then the finish). C19th Bricks have dried out, noticeable improvements in heat and sound insulation, no more painting, much improved appearance. Would certainly do it again despite it being more expensive than the alternatives. Going rate is £52psm so expect to part company with almost a bike.

    Premier Icon finbar
    Free Member

    Thanks BillMC. Funnily enough the ‘Weber’ guy said monocouche is easier to repair than silicone 😀 ! That’s great that silicone has cured your problems though, we’re hoping for a similar outcome.

    I’ve got about 90sqm to do and some challenging scaffolding so it will be a very nice bike indeed…

    Premier Icon BillMC
    Full Member

    It certainly improves the saleability of a place (might be relevant soon) plus in the future I shall be looking very very warily at brickwork, pointing, render, damp, plastering, bleeding. An estate agent said he’d had monocouche done and I assume he knows something about it whereas the plasterer I employed was much preferring the silica.

    Premier Icon perchypanther
    Free Member

    If it’s cost neutral, i’d choose silicone over monocouche. It’s more durable, more crack resistant and stays looking cleaner for longer due to it’s hydrophobic nature. It’s usually more expensive than monocouche. I’d say you’re comparing an expensive monocouche system with a cheap silicone system there. Ask how much the Weber Silicone is perhaps?

    Smooth render systems, of both flavours, don’t patch well if repairs are required and can also be prone to algal growth over time, especially light colours.

    Be aware that your smooth white gable might end up green in a few years.

    Premier Icon Richie_B
    Full Member

    An estate agent said he’d had monocouche done and I assume he knows something about it

    I’ve heard estate agents explaining why all the loft insulation was stacked in the corner of the roof space in its original packaging (I assume the estate was signed off on a ‘random sample’) was to ensure the bathroom was nice and warm. Did he know what he was talking about? (and no we didn’t buy the house).

    Premier Icon timbog160
    Full Member

    Hmmmm I’ve read Perchy’s post several times now but I still don’t get it. Can somebody explain the punchline 😉

    Premier Icon UrbanHiker
    Free Member

    Out of interest does anyone know how that £52/m stacks up against external wall insulation with a timber finish? Are there any industry standard figures for these sorts of things?

    Premier Icon finbar
    Free Member

    Hmmmm I’ve read Perchy’s post several times now but I still don’t get it. Can somebody explain the punchline 😉

    I’m honoured I got an entirely serious response 😉 !

    Weber MPRAL is c. £20/m2 at a thickness of 15mm. Johnstone’s silicone enhanced is c. £7.50/m2, but 1.5mm thick and has additional costs for the base layer which I can’t (be arsed) to determine.

    Neither seem to have any horror stories coming up on Google.

    Premier Icon finbar
    Free Member

    double post, ignore

    Premier Icon UrbanHiker
    Free Member

    So what do I have here? There are 3 distinct layers. The brickwork, then a 15mm layer that looks to my untrained eye like concrete, then a 1mm layer of brittle stuff with a paint coating. This piece, the outer 1mm painted layer fell off after the last freeze. Looks like the rest will go at some point.

    [url=https://flic.kr/p/2kQ5nQ8]IMG_2057[/url] by KingOfBrad, on Flickr

    [url=https://flic.kr/p/2kGyDxu]IMG_2058[/url] by KingOfBrad, on Flickr

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