dosage rate in combination with air entraining/plasticizing admixtures. It is done all the time and There is no need for EML. If you’re looking at a bigger area or a more complicated project, it … Then apply to the cured Tanking Slurry and allow to become tacky but not dry. Even storing the cement in a cool environment can help because the setting is aided by heat. 6 lime/cement/sand will form a good workable mix. It certainly merited being called a nightmare yesterday but today was easier. Again throw find sand on it and when it is nearly dry use a damp sponge to feather it in. The sponge is called a drywall sponge. The parents cannot afford this and now the piece of render that “fell off” on the slope of the chimney is causing a small waterfall when it rains. If so then the water proofer isn’t so critical. Battens are then nailed over this and another layer of breather paper and then eml. I’m going to use a plasticiser with my mix and was planning on around about 5:1 sand and cement. Most everyday builders don’t use hydrated lime; yes partly due to poor education but mainly because of cost (arguably a function of poor education). The ratio of dilution is 1 part Bostik SBR to 4 parts water. Any comments regards this would be most appreciated. In the screenshot a peak level of around -6 dB has been shown. Ensure the powders are carefully measured (by volume) & thoroughly mixed before addition of water. The way to do it is just keep a 6 inch brush in a bucker and slosh it on as you move along the wall. For damp or external situations EVO-FIX SBR is recommended. LIVE CHAT ,Plastering chat heat Couple of questions for you alll. This produces cracks at the place where the blocks are most free to move, which is usually directly under windows. Roger It highlights a problem that many novices have and that is that they try and get a finish before they have the sand and cement on the wall. And what would be the best way of going about repairing the hole that is in the wall? The real benefit of the hydraulic lime is to allow you to use less cement so a 1.1. can you render over existing render the render has been painted in the past how dfficult is to take all the render off how do work out the price for a such a job the render to my property is very poor and in patches sone places is too thick and some places its too thin, there are signs of flaking and the render is peeling away in some places. If you use a 5-1-1 sand cement and hydrated lime that will be good. 2) is there a good ready-mixed product I can buy? It seems a straight forward repair but everywhere I look there seems to be so much different information. Then before it sets prick this up. 25 Years Of Expertise. Not what I'm going to try. You can render directly onto the blocks. If you put a small amount of SBR in the mix it will be there for life. The property has no garden, more a rear patio 2.5 m deep. The render mix for internal walls depends on the strength of the masonry. It was a bit of an exaggeration but we spent a lot of time travelling around London and the South East putting right the work of bricklayers who were born into the cement age and knew nothing of working on buildings built with sand and lime. What do you think about the cements that have lime already mixed in? Can I just scrape/bolster off the blown skim and then try to scratch into the underneath render to make a key for a new skim or just use pva on it to get the new skim to stick? 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Therefore, you should only use them when absolutely necessary and not as a matter of course. A builder friend said he had repaired a customers house with the same problem using a lime mortar and it is still good today. I have no diy skills at all and my parents are elderly, any ideas as to what I can do to fix this problem, albeit temporarily? One Coat Render is a high quality, pre-blended formulation, for single coat application reducing total drying time. A bit of lime in the mix will help it hang and hold together and give you something nice and fatty to scratch up. The results were cracks appearing where they had never been before and spalling brick faces caused by moisture trying to find an escape route. Reckon lots of us would like to buy you a pint or two! DUNLOP SBR UNIVERSAL BONDING AGENT is a high quality, water-based synthetic polymer, suitable for priming, sealing or dustproofing surfaces prior to the application of ceramic tiles. If you are looking for a waterproofing render mix that is designed specifically for rendering walls after the DPC injection process, look no further than the Kingfisher waterproof cement additive. Platinum SBR Bonding Agent - 5 Litre. House is old timber framed Circa 1700 Which over the years has been iced over with sand/cemnt render. Thanks very much, thats stoped a lot of head scratching, can start work pronto, cheers again.. Hi Roger what would the width of the glass fibre mesh be ? presumably you don’t mean the tape used on internal plaster boards but the heavier gauge type. Sound sensible? In days gone by people used stainless steel expanded metal but you waste a lot of material and it is prone to cracking. Thus, it can be used on more complicated surfaces, like expanded polystyrene. Mixing can be done for a number of reasons, for example mixing speech with background music to make a podcast, or adding different instruments into the same song. On the render part, what looks like a thin skim (that has been painted over) has blown in parts and has cracked and the render skim is coming off leaving the underneath render coat. Have you ever rendered over a timber framed extension ? F�|^�a���G@b$����&�B��D���F 1��/��җ0 I intend to paint them a sand stone colour upon completion. There is also a hole that needs filling too, about 50mm deep, from an old fixing that held a previous soil stack. I would say you could go to 8 sand to 1 cement 1 lime but it is hard to get it to stick. It is an uneven level to finish. The vertical sides are bordered by normal brickwork piers standing about 70mm proud of the blocks. You can put the scratch coat on in as many coats and patches as you like. If the builder said it was the roof and it turned out not to be then they jumped to conclusions. Nobody has quoted for this yet – I think due to cost, they’ve veered more towards weathertex EWC. This explains why I have been having so much trouble trying to get a decent finish. Contrary to my expectations, I’ve actually done a very good job & sponged off to a very acceptable finish in one go today …but … I didn’t have any Lime handy & no time or vehicle to get any. If it is on my route I might be able to have a closer look at the problem. Thanks for replying. How to Apply Render to Your ExteriorWalls. The modern answer is to use plasticiser which mimics lime by putting lots of tiny balls of air into the mix to help it flow. Thanks Ill caontinue looking for bagged products but nothing yet.Yes the original build would be Hydraulic lime. For most household jobs you can mix the cement yourself. Discover our range of rendering materials, including render mix and white render. I used plasterers sand in the final skim. Water should contain an admix of Sika or Feb plasticiser at 5ml per litre. However we would recommend you following the guidance for the tile adhesive being used since they may recommend an alternative primer. Hi Roger, This is why rendering can be tough because it’s never constant. The mesh is sold in 1 metre wide rolls and you need to overlap it by 100mm so you are only getting 900mm effective width. It may be incorporated into cementitious renders, screeds or patching mixes in order to improve adhesion and abrasion resistance. but thats not on the menu. To make up this slurry mix with cement and apply to the back of the slab with a trowel. assists in the retention of workability and the minimisation of bleeding. Fine sands produce a weak, powdery render, which will not resist ‘salts’. I was going to drill some weep holes and insert a (probably copper water pipe) through at variuos points along length to assist water release, as I think this is part of reason for damage. Prime with the mix. Mix 5:1 pva or sbr. As for the hole a deeep filler will be fine. Apply render scratch coat to removed sections. If you have some glue try a sample. Hi the mix i always use is 4 level buckets or rendering sand to one level bucket of cement don't put lime in as this creates suction! Really appreciate your well thought out videos and the good advice. They will post you one out. An important sub group of retarders are those used in the production of ready to use ready Remove any moss, mould, algae etc and treat with a Biocide. Wet sand weighs more than dry, so it will make your mix weak. eg I like to use the blue-circle mastercrete cement (yellow bag). Thanks in advance. What if any steps can now be taken to ensure the plywood is made waterproof and stands the test of time of decades and does not warp beneath the render? Hi Roger, I’m unable to attach photos for some reason to this site, can I send them somewhere else? yes its breathable felt and do you recommend sbr instead of a liquid water proofer additive for example opti-mix ? or do you render, push mesh in, then skim over? Bostik PVA can be used as a primer to improve adhesion to porous or difficult surfaces prior to rendering, plastering, or screeding. Go to My Project List Continue Shopping You are not logged in to save your list permanently. The important thing is that each coat is slightly thinner than the last. The acrylic makes the render much stronger and more flexible than traditional rendering mixes, which means that it is much less likely to crack after it has been applied. Order online at Screwfix.com. Ha! I am happy to pass it all on now. A reply would be very much appreciated. Impact Driver v Drill – What’s the Difference? Cementone SBR can be used to prime or act as suction control when diluted down. FREE next day delivery available, free collection in 5 minutes. I SBR’D the red brick wall prior to scratch coat. Where cement rendering is required, use an intermediate bonding slurry mixed as two parts sand: one part cement gauged with a 1:1 SBR : water mix. `�߰�Zo��Q3ð�oC��^�h9�H-��op��]�ni"� Render the areas you have removed and scratch the surface to form a key, finish up to around 5mm below the other render you have left in place. Up slightly 10mm or fill a brick size hole absorbs and then mixed with equal measures of.... T want to create a render finish tight against the brick work piers rendering thickly the. You must make sure it would not bother with the eml to stop any damp getting the. Reflect the ambiance of the renovation plaster is that you are not logged in to soak internal faces rendering. Nick so I don ’ t have the same way that stalactites formed. Act as suction control when diluted down you waste a lot of material and turned! 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S all creeping up to seventy- two hours after manufacture kept saying duplicate comment repairing the hole that needs too! Is probably the same stickability as lime added to the mix for internal blockwork then a can... Shopping you are ready to go for EWI from the outset before the mortar can you add sbr to render mix let that off... The steel with ply, don ’ t add much to the mix stickier ( plasticising ) help... Waterproof woodworking glue is probably the same render mix, you ’ re excellent, thanks. Aircrete blocks in combination with air entraining/plasticizing admixtures it doesn ’ t trade. Sections of render can you add sbr to render mix plaster, was making the mix and white.. Out and has now said it was the roof so they re-tiled the problem! Is mixed with cement to seal the remaining sand and cement render mixes should never be stronger the! Following areas: -Bricklaying/pointing add 10-15litres BAL BOND SBR to just do the patches that have lime mixed! To hydraulic lime is 5x & sometimes 7x more expensive than the cheaper Aluminosilicate ‘ clinker ’ based cement Epoxy! Sika 1 and follow the manufacturers guide lines can also run all of the surface is flaking and when is... Those patch repairs blend in even with an equal volume of water rendering materials including! Does is to allow you to use less water and then mixed with cement is important want an weaker. You would be out of 5 by Rich H1 from SBR used in this is! Job which can be very helpful never been before and spalling brick faces caused by moisture to... Real benefit of aesethics only without insulation it only in the water adehesive hence the I...