£13. Click & Collect. Brick waterproofer to help prevent damp on bricks & masonry. Go all over it and knock off the loose stuff. You can sand down the corners as far as poss and put a few coats of red oxide or any other number of magical rust cures, I've done it a few times, it will buy you a year or two. com. Applying the board directly onto the membrane with thin adhesive and mushroom fixings. £21. 49. £ 24. Don't try and apply render in one coat it will only sag and probably fall off wall. Developed to repair damaged masonry between brick and stonework. 99 Inc Vat. 3N dense concrete blocks. Then sharp sand fine, lime, cement in 6: 1: 1 ratio as top coat. ★★★★★ ★★★★★. Discussion in 'Builders' Talk' started by Victor Lek, May 24, 2022. Will this be enough. com. Styrene-free, vinylester-hybrid, high performance mortar for the most demanding requirements. Extremely durable and will adhere to any substrate for filling and repairs with no depth limit. Roughly 1 of cement, 1 of lime, 4 of sand (usually sharp), below dampcourse, no need for waterproofer (some put it in anyway-also helps spreadability). Delivery. The problem I am having is that the waterproofer in the scratch coat is not allowing the finished coat to go off for up to 8 hours ( wall in shade. Sika Bond SBR+ Waterproof Bonding Agent and Mortar Sika Bond SBR+ is a one component, water based, general purpose, styrene butadiene rubber emulsion bonding agent and mortar admixture. Can anyone suggest a good product to prevent/reduce water penetration that can be applied over the existing render, preferably by the builder who did the first render as obviously he wants a satisfied customer. Sandtex Ultra Smooth Masonry Paint Pure Brilliant White 10Ltr (23771) (573) compare. It is all studded then waterproof membrane & has expanded mesh over it and then its rendered. Rub up the render with a plastic or wood float ( an off-cut of 2" x 4" will work as a float trowel) and tile straight on to it. Domestic & commercial use. . You could remove all the damp affected render and plaster back to stone and then render with a 4:1 mix of sand and NH lime. Add for Delivery. 5 Ltr. #3. )As long as you have good key you could get away with one coat say 10 mm thick. £8. Ideal for locations such as basements and cellars or for external coating for concrete, brick, block and bonded renders. It incorporates a Polymer bonding aid allowing the results. £17. The paint has been fine until this very wet spring, when it started to bubble and peel in large random areas. 5:1:1/2 Good gritty sand, (or plastering/rendering sand) cement, lime, in two coats, scratch first coat, no pva just well dampened walls. 5 Ltr. Slow setting time makes it ideal for covering large areas in one application. Apply Water Seal directly onto damp surfaces to provide long lasting waterproof protection within hours. Screwfix Community Forum. This will depend on the surface of which it's being applied and the strength of hold required. final coat of render needs to. If you do not want to change the appearance of these walls then use a masonry waterproofer (two coats). This sealant is suitable for for repelling water on porous surfaces. I have seen many threads about lime / no lime and whether you should waterproof on the scratch coat / finish coat etc etc. Weber One Coat Base Render 25kg. £6. Discussion in 'Painters' Talk' started by Joelfc89uk, May 24, 2018. May produce an allergic reaction. Cement mix and mortar mix are ideal for a large selection of tasks including pointing brickwork and stone, repairing concrete and render and filling holes or setting posts. Page 1 of 2 1 2 Next > Thread Replastering around doorframe with very uneven brick walls. Add 1 cup of a waterproofing render mix per bucket full of water you mix. Login to save for later. G4 Pond Sealer is a moisture cured polyurethane which forms a non-porous seal on concrete rendered ponds, G4 pond sealer uses the moisture in the air and the render to harden, G4 pond sealer can be applied to slightly damp surfaces, but it is important that the render is sufficiently dry to be porous so as to enable the first coat of G4 pond sealer to bond and obtain a. If I render with febond sbr sand and cement render then I can use 10mm travertine tiles. No waterproofer in render scratch coat. Primer paint is required as an undercoat before applying the upper layers to any surface. But it has no brick exterior wall. 2) Fit a bellcast. Bonding is not a good idea on external walls, it attracts water to it. #2. £27. Overcoat with any. It seems a lot of dampness for such a small amount of cracking but I suppose this is the best place to start to reduce the. If you bought the paint you can get a refund on it. 99Inc Vat. As well as offering protection, exterior wall paint improves the appearance of a property by brightening it up and bringing it back to life. 90m x 50mm. cautious New Member. ssss64 New Member. OR 5:1 Good gritty sand, (or as above) cement and a bit of plastisizer in first coat (again scratched) then Rendamix in. Weather-Resistant. The waterproofer acts as a plasticiser also, in fact with a rather coarse sand it is a far better plas than plas! A 10-15mm floating coat is good, use a length of 2x1 roof lath to rule it straight then when it has taken up enough float it all filling in all the slacks (holes) then finish with a damp rung out sponge (optional). Delivery 7 days a week 60 days free credit available. cement board and the masonry wall must be wiped down to. Click & Collect in as little as a minute. Leaving me a few mm to be skimmed. 5 Ltr. but the property is in a really exposed position in the Penninnes, built of sandstone, it is grade 2 listed, and the mortar it is pointed with. Bostik Cementone General Purpose Mortar 5kg. Big Jumbo, Jul 27, 2009. ★★★★★ ★★★★★. Is unibond OK 2. Mix approximately 4 to 5 litres of water per 25kg bag using an electrically driven mixer until you achieve a workable consistency. Currently in Stock. Waterproof render for external earth retaining garden wall!!! Discussion in 'Builders' Talk' started by oggie78, Apr 7, 2009. At minimum, the rear of HardieBacker® 250. Is there anything I can do now. Ricky Johnson New Member. My builder is advising to render and d&d, but this seems like more work to me for no real reason. He uses plastering sand and cement mixed at a 3:1 ratio with waterproofer added, no lime or plastisiser. Construction Project Manager, May 29, 2015. £ 27. Sika Bond SBR+ Waterproof Bonding Agent and Mortar Admixture - 25L (6) £99. So it'll be damp from behind (penetrating damp) and damp from below (rising damp), so not much to be gained by. Generally, 5 litres of SBR per 25kg bag of cement in an external render for an area of normal exposure. Good luck. Suitable for a Variety of Applications. 99Inc Vat. VAT. Weber One Coat Base Render 25kg £18. The Screwfix Community Forum strives to be a friendly and supportive place, where you can share your expertise, ask others for theirs, and enjoy ‘socialising’ online with people who share a common interest. If you really want belt and braces, then seal it with a clear sealer, then you won't have to paint it every few years. com. Render up to (or very slightly below) the damp course, finishing with a 25° slope down and outwards from the dpc. Hi Guys. Click & Collect. However as an temporary repair would it be OK to remove the loose render, apply unibond and then use Waterproof cement from Evo-stik - idea being this sets in 20 mins. 40 per KG. I'm putting a corner shower into the bottom floor (concrete pad) of my house. RECOMMENDATIONS:Alchemy Plastering. Using colour dyes to a render coat would not work because the colour would fade over time even if you did achieve a uniformed initial colour when batching up. setting manholes and repairing rendering and floor screeds. For Interior & Exterior Use. Choose from top trade brands. Screwfix Community Forum. put your water in the mixer and then add a shovel of lime ,let it mix up for a minute and add 6 shovels of sand, half a bag of extra special cement and another 6 shovels of sand. Ideal for internal and external use as a waterproof render, it is suitable for use on walls prior to plastering and on floors prior to self-levelling. My sister had her coal cellar done last year, and the guy used Sika 1, then rendered and plastered over it. Then sharp sand fine, lime, cement in 6: 1: 1 ratio as top coat. The old one is of crumbling brick and an (equally crumbling) smooth cement render. Provides superb weather protection for bricks, mortar and concrete. Apply a bitumen or Pitch Epoxy coating from the outer edge of your 'slope' all over the existing dpc and up the wall 150mm. I intend to stipple a further slurry of Unibond, cement and sharp sand before I render the wall to make it suitable for applying tiles in the shower area. First time doing render and there will be soil behind the wall but only to a depth of 300-400mm, should the back be left unrendered but with some waterproofing and drainage? Also thinking of putting some dpm behind the bottom of render as in attached pics or is this overkill! Any helpful suggestions welcome, thanks in advance!hi all,my mate wants me to re-render his damp bathroom. I understand that the waterproofer will do what it says on the tin, but only if in the first coat and then covered by another coat of render. FREE next day delivery available,. render SamBeevor96__ New Member Renovating an old cottage which has penetrating damp, looking to apply an internal sand and cement render adding thermoseal/waterproofer to stop the damp coming through. KA Tanking Slurry is the complete crystalline solution to waterproofing masonry and blockwork. • High performance waterproofer. Evening guys. PAGE 1 OF 2. What do you reckon is the prime time to float finish render. water ,once the sand and cement is added let it MIX!don't take it out because it looks ok,let it mix dont start rendering until the second mix is ready. Suitable for new or renovated substrates, either unpainted or painted: gypsum plaster, old painted surfaces, cement, concrete, breeze blocks, bricks, stones, glass and. 35°C. Covers Approx. Can any EXPERIENCED plasterer advise if I can render over existing multi finish plastered wall with sand and cement (with added waterproofer) to level it out as its bowed? I don't want to use browning or bonding as it sucks moisture and this is an exterior solid non cavity wall. I'm no pro on this, but have done a lot of research into it. If it could be dug down far enough then a waterproof render might be enough hallbeck, Jan 24, 2007 #3. com. K Rend). 202 Integral Liquid Waterproofer is a liquid additive that provides long term water protection to mortar, concrete and rendering. Remove as much dust as you can and apply a decent coat , you may want to apply a second , then throw sand over the area of bitumen this will help key the render , the next day apply a scratch coat over area and leave until dry , apply top coat of render and set to finish. From what I’ve read on this very helpful forum, it’s a water/salt problem. Need to render an external wall or building? The Everbuild 507 Rendagrip bonding agent will help ensure your render sticks firmly to the desired surface. I use to put waterproofer in both coats, but some peeps on do scratch coat. uk. FREE next day delivery available, free collection in 1. G4 Pond Sealer Clear. Corrosion-Resistant. he says his shower has been leaking against the wall to which it is mounted. Glazing and frame sealants come in a variety of acrylic and silicone based sealants, used to keep your home free from water ingress. It sets to a rock-hard finish and can be overcoated in 24 hours. im rendering onto concrete blocks on the outside of my new shed/workshop. Buy Jointing Tape at Screwfix. The DPC is there to stop raising damp, the rendering should be waterproof so it's not going to cause a raising damp issue, lots of houses have render right down to the ground level, though a lot of them will have a kicker plinth at the point of DPC to stop rain water running down the wall beyond the DPC, this. Unibond PVA is renowned for being the only BBA accredited PVA in the UK, and we stock Unibond super PVA with a high bond strength for gluing ceramic tiles, carpets, plaster and much more. 4m²/Ltr. Covers approx. Sets in 20 minutes. £ 28. Often soft in texture, when applied these substances harden. com. Delivery. The fine aggregates are suspended in a unique waterproof polymer to ensure easy application by roller or brush. Apply with Brush or Roller. this mock tudor job i am doing has part of the render overlapping the lead flashing along the biottom. 2017 #2. Furthermore, the stabilising solution and PVA will both act to keep any moisture within the concrete, hence why you experiencing problems. it is a little tired in. Do I have to waterproof the blocks first or use a waterproofer in the render?As expected all the windows seem to be missing the silcone and allowing water to get in. 93. FREE next day delivery available, free collection in 1 minute. Render - smooth finish. VAT) Quick. giving a lighter easier to work gauge of mortar. South Gloucestershire Technical Advise Leaflet : Lime Render 2 Introduction Render was originally used to provide a protective covering to stone or brickwork. 1. With 10mm for the scratch coat and 8mm for the top coat. PVA sealer is an extremely versatile, odourless, waterproof and non-toxic adhesive that is suitable for a multitude of tasks and requirements. Prop the hose up splashing against the wall and go and have a cup of tea. For picking up 1" use two coats of 1/2" each. Totally forgot as was so busy myself and only had a spare few days to do it. The earth is retained in the garden with another wall. Light grey colour when dry. When dry paint to match. fillyboy Screwfix Select. Thread by: Crooky, Jul 4, 2021, 2 replies, in forum: Builders' Talk. Use on Plasterwork, Skirting Boards, Windows & Door Frames. £59. Home Forums > Screwfix Community Forum > Builders' Talk >I will need to clean the base coat which is solidly attatched to the block wall and scratch it, probs with a grinder and apply a new top float coat using a mix of sand / cement / waterproofer and maybe lime as per this sites recomendations. 1/5. Grey colour when dry. I'm painting a house at the moment and the customer wants a more long term solution so I'm cutting away 4" of render either side of the corner. View all: Bostik Cement Mix. 8/5. I've panelled it off with 3/4" exterior ply, fitted a stop-bead (or whatever it's called) along the bottom edge, and am now looking for advice on how to prepare the surface for rendering, please. I have hacked off crumbling old plaster to expose old brickwork and breeze block walls and I have primed the surface with 1:5 mix of Waterproof Unibond. Suitable for 2. Been in exact same position 20 years ago, building control wasn't happy with the so called waterproof render on a small extension, I had to run a disc cutter along the line of the damp coarse and fill it with mastic. Is either expanding foam, or white silicone OK in this situation (inside of course, render with waterproof mix on the outside)? Cold & Heat-Resistant. Hundreds of stores nationwide. If you are going ot paint it, use a. dougalhouse Member. How many coats do you reckon fort he top coat?Water resistant bonding agent for external rendering and screeds; Admixture for concrete repair and tile fixing mortars; For improving resistance to abrasion, chemicals and oils; Reduced shrinkage and cracking; Improved workability, waterproofing and mechanical properties; Approx consumption : 5 - 7 Litres per 25Kg cementOrder online at Screwfix. £3. Is it okay to press on with the inside works (batten out, 25mm celotex and 12mm plasterboard) before the rendering is complete? The renderer is proposing to do a scratch coat and then a top coat with waterproofer mixed in, and then it will be painted with something like Dulux Weathershield. £9. gauge everything put the water in the mixer then add the lime to the. The biggest problem with a single-skin external wall is condensation which most people confuse with rising damp. The process involves using a detergent to chemically clean the render using next to no pressure at all. A friend has given me some acrylic render (premixed tubs 25kg) which is a topcoat, and more than enough to do the job. 7/5. Interior Wood Paints. Buy Cement Mix at Screwfix. 99 Inc Vat. Inc. cautious New Member. Thompson's Water Seal uses a unique micro silicone emulsion to stop water penetration. Pieces in Pack/Case. Hi, I am going to render round the bottom of the bay windows, would it be a good idea to use integral waterproofer? One of the bays is north facing. Mix approximately 4 to 5 litres of water per 25kg bag using an electrically driven mixer until you achieve a workable consistency. 2/ render the walls. com. 2nd coat (floating coat) 4:1 sharp sand with waterproofer as above etc. Any recommendations based on the wall being made from dense blocks?If you were re-rendering the house you wouldnt put a waterproofer on first. com. You shouldn't use PVA for external render however they do make an external grade one but this isn't necessary. I know this is not the best route to go in waterproofing a wall normally. The wall has a cavity with no insulation and about 150mm above the damp course. , Feb 26, 2008. Only way to test if it's still wet is with a moisture meter. This Everbuild 402 Water Seal is a sealant that stops water wear on brickwork, stone masonry, concrete, pebbledash and other exterior walls. DIY_Has123, Feb 3, 2021. Sikagard Facade makes walls and. ex. Waterproof. com. 2 apply a suitable rendering adhesive (Powerwall make one but so do others it is like a polymer based tile adhesive) 3 bed a fibre glass mesh in the adhesive and trowel flat. Can any EXPERIENCED plasterer advise if I can render over existing multi finish plastered wall with sand and cement (with added waterproofer) to level it out as its bowed? I don't want to use browning or bonding as it sucks moisture and this is an exterior solid non cavity wall. Show More. Â New Member. 90. Whether you’re looking to stop a leak, repair an existing roof, or fit a new roof, Bostik has a solution to support the step-by-step process of your next waterproofing project. View all: Sika Waterproof Sealants. Click & Collect. That allows the material to be worked easier but as you may be aware render doesnt take a lot of working before it falls off the wall. ★★★★★ ★★★★★. 99 Inc Vat. I’m leaning more towards K rend, as it’s silicone and. ie. Suitable for new or renovated substrates, either unpainted or painted: gypsum plaster, old painted surfaces, cement, concrete, breeze blocks, bricks, stones, glass and. K Rend). 90 Ex VAT. What depth should the battons for the scratch coat be? I was looking at 10-15 mm deep off the wall. FREE next day delivery available, free. waterproof render. This coat should be applied while the first coat is still. Apply the render with a steel plastering trowel and scooping it from a plasterers hawk. The bottom line is you require a waterproof wall; your solution of replacing the existing render with new would still require a waterproof paint, so go the whole hog and improve the insulation value of your wall, you will still get your new render be it 50mm further out, the bonus is you will save on your heating cost by reducing the heat loss. The inside of the wet solid walls seems to covered in wet sand and a black paint type substance as in the photos. Â , Jan 25, 2008For 'normal' render this would be a day or more, but with SBR in the mix, it should be no MORE than 8 hours? I assume that if you did leave it a day between scratch and finish coats, when using SBR in the render, you should prime the scratch coat surface before applying the finish coat with SBR slurry mix. Extra grip, render bonding agent that contains a fine aggregate to provide an improved mechanical key before applying render on external concrete, blockwork or brick. Screwfix customers rate this product 4. Tapes suitable for a range of materials stocked. At certain points the garden is upto a foot higher than. PermaSEAL 3 Damp Proof Membrane Kit 10m². The internal walls are damp from floor to ceiling and I am told by a specialist damp firm that the damp is due to the cracking. There is a white crystal deposit under left on the exposed render. Suitable for interior and exterior use. oh! and ladies. You capture lots of potential issues in one go, including new ties and new DPC, and probably the opportunity for some insulation. Provides a hard wearing, protective layer on wood, metal and cement. Stops freeze thaw damage. 4/immediately the last coat is on and while still wet, blind with sand. In the presence of water these swell and block the capillaries and pores in the applied sand / cement renders, screeds and mortar to provide an effective barrier against the transmission of liquid water with a proven track record for over 100 years. Product Type. Deme23 New Member. If others have done it - then they have done the wrong thing. With top trade brands available, offering great quality products, you'll be able to continue working even on the. I have asked a local builder to re-read our chimney as it was badly cracked and had started to let water into the loft. I have waterproofer and unibond. Cmd38 New Member. Product code. 4m²/Ltr. Delivery Next day available. Sika Proof Liquid Waterproofing Admixture is a general purpose, ready to use, economic waterproofing admixture for mortars and concretes. £13. Breathable masonry paint is essential for waterproofing your exterior bricks while allowing moisture to escape from inside your house. It Is single skinned and with render onto boards which were lined with fibreglass mesh. The rest of the garage walls are rendered and painted and I would like to know if I can render over the blocks. Phil the Paver, Nov 22, 2014. This can take from between 24 hours up to two days, depending on humidity, temperature, and airflow around the building. £30. £9. Use on brick, concrete and stone. Find your nearest Screwfix store and up to date opening times. I usually rule it off,fill the hollows and then leave it until it starts to get firm (dependent on the background I know). #4. Out of stock. Fine. Dow 791 Weatherproof Silicone Sealant Anthracite 310ml (44836) (42) compare. Our team of experts are on hand to help you at every step of the process. 48. FREE next day delivery available, free collection in 1 minute. Suitable for brush application only. Product information. 96 per L . Hi i've built some raised flower beds / planters out of dense concrete blocks. Use a coat of 2:1 sand cement with waterproofer followed by a 3:1 and then a 4:1 (all with w. I want a rustic finish which is why I'm not going for tiles, and ideally would like something like lime render but would like to know if their are any waterproof plasters / cement or whether you can use what you like but simply give it 2/3 coats of a suitable varnish. Buy 3 for £11 - View Offer. Many thanks!The problem here, is that the render will be 'attacked from behind' by damp from within the beds - unless you're provided adequate drainage for the trapped water in the beds. It is only about 2 months old is it possible I can have a a company in to lay k-rend straight onto the render?The plas will work its way into the mix and soften down the mix as it turns. I’ve done an extension and due to the nature of the land, now the door of the extension will be about 50cm above the grass of the garden. I added Sika MaxMix concentrated integral waterproofer, but not sure I used enough as I added it to the gauging water and not the weight of the mix and the sand was damp. more damp comes through i would like to waterproof the render. Waterproofs Plaster, Plasterboard,. com. Water vapour permeable. Wet room Kits consists of a mix of products which are needed when creating an open plan showering area. Can be used to seal joints between tiles, stone and brick slips and pointing around lead flashing. Volume. Waterproof render (sika 1) on the walls and d&d insulated plasterboard. You could have asked the plasterer to add a waterproofer to the render mix, but it's obviously too late now. dj. dougalhouse Member. My qustion is: Will I need to use a (waterproofing?) additive to the render mix, particularly for the inside surfaces of the drain. Covers approx. Use stainless steel bellcast/render stop beads as req. I now have a choice, either to continue with the original plan (not so keen on that idea now) or to re-point the worst bits and then apply a waterproof lime wash. Suitable for Water, Oils & Chemicals. Phil the Paver, Nov 22, 2014. £8. Neville the tap dancing gibbon, Sep 2, 2006. £ 28. Will not corrode steel reinforcement (brick ties etc. Easily secure a wide range of applications in place. blertsville, Jul 4, 2011. Volume. Click and collect in as little as 1 minute. sharp is for screeding. • Gives coverage of approximately 2 – 4 m² per litre per coat. Order online today. Render, Bricklaying and Floor Screeds. I would have used a 'Monocouche Render' like Weberpral M, or K Rend both are coloured all the way through, available in many colours, saves painting. Screwfix Community Forum. The 2nd. If you are in a bit of a wild area, then consider epoxy - two-pack - masonry paint. Order online at Screwfix. Contains 1,2-benzisothiazol-3 (2H)-one and reaction mass of 5-chloro-2-methyl-2Hisothiazol-3-one and 2-methyl-2H-isothiazol-3-one (3:1). Will depend on the type of silicon, and will only work with oil based paint. 45 Inc Vat. Screwfix customers rate this product 5/5. #9. Thermalite hedge their bets somewhat on their finishes section. Also for repairing cracks and damaged stone edges. View all: Bostik Cement Mix. For Interior & Exterior Use. 2 coats of 1:4 cement:sand render with waterproofing admix, first (scratch) coat 12 - 15mm with scratches to gove a key to the finish coat 5 - 8mm, 24 hours in between coats. . damp down the area your about to work on to get rid of the dust. com. From waterproof adhesive to glass adhesive, it is important to choose the right glue for the job. Wall fillers and flexible fillers create a clean smooth and professional finish. e. too much suction 4:1 will do you. Mr.