Is 3:1 plasterers/rendering sand to cement correct for the scratch coat and what about subsequent coats? What's the maximum thickness of scratch coat and top coats?If you go for this option you'll need to render the stonework first to give you a suitable surface. Having said that, there are proper ways to do it - a layer of Tyvek, staple on some. Mould & Mildew-Resistant. My sister had her coal cellar done last year, and the guy used Sika 1, then rendered and plastered over it. I plan to re-flaunch my chimney in April when weather improves. Overcoat 48-72 hours after application with any. Screwfix customers rate this product 4. 80. Anti-Crack Acrylic. Brickie might. 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. Is either expanding foam, or white silicone OK in this situation (inside of course, render with waterproof mix on the outside)? Cold & Heat-Resistant. Â, Dec 1, 2007. Waterproofs Plaster, Plasterboard, Plywood, Render & Concrete. , Feb 26, 2008. £179. it is a little tired in. Order online at Screwfix. Two thin render coats. As well as waterproofing, this product also helps to prevent condensation and efflorescence, keeping structures in great condition for longer. My builder is suggesting cutting 100mm of it away at the bottom to let it breath. This is to avoid spraying the chemicals which can then drift in. This would improve the temperature somewhat, reduce any condensation and also allow the wall to breathe thanks to the studded membrane. com. My qustion is: Will I need to use a (waterproofing?) additive to the render mix, particularly for the inside surfaces of the drain. Sika 1 Waterproofer is an aqueous solution containing complex colloidal silicates. 5 Ltr. Available in different variants, it is important that the right basecoat paint is chosen for the job. Over 40,000 products. 99Inc Vat. The pointing needs raking out 25mm deep, and re-pointing with a 4:1 sand & lime mix. 4 use mechanical fixings to fix this system to the wall. B) To seal around the bathtub - I am planning on using the Schluter Kerdi TS Bath and Shower Sealing Kit. Home Tags > rendering. 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. com. Reduces water penetration without acting as a vapour barrier. Low toxicity. Most if not all are painted with. Light grey colour when dry. Big Jumbo, Jul 27, 2009. Volume. com. Charlie Far!ey New Member. 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. View all: No Nonsense Water Seal. 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. The wall has been constructed out of 7n concrete breeze blocks and before i backfill i need to waterproof, it needs to be plant friendly. The render around the mock Tudor beams on the outside of a property I am looking at is cracked. If you wait then water will get in behind it and more and more will fall off. 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. Mix approximately 4 to 5 litres of water per 25kg bag using an electrically driven mixer until you achieve a workable consistency. Use it as a bonding agent, primer, sealer and. Thread. Home Forums > Screwfix Community Forum > Other Trades Talk > waterproofing internal rendering Discussion in ' Other Trades Talk ' started by woodburner , May 16, 2006 . . Designed for use in fully. Scud the wall first with 1:1 sand/cement next day dampen down before rendering with the hose, thermalite are a pig to render unless you are quick. We encourage you to debate the topics and issues of the day in a friendly manner, whether related to trade/DIY or not. ALlow to dry for 4 or 5 days and then finish with a render of 6:1:1 rendering sand:cement:lime. Low Odour & Solvented. B. Choose from rapid or fast set cement for small commercial or domestic jobs. Febtank Super is a high performance tanking slurry for masonry and concrete. Apply the render with a steel plastering trowel and scooping it from a plasterers hawk. Are there any issues with MDB's - i know thermalites are a pig but are these any easier?you will need to hack off the external render and re-render with sika No. This time, its butting up against 12mm plasterboard (painted) which was dabbed directly to the brick (no render). I've attached some images. 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. You can use metal beads for all windows and angles and drip beads for your bell. Most external decorative renders are painted, most have a combined waterproofer and plasticiser addidive in last coat. We would like to show you a description here but the site won’t allow us. Lead-Free. He advised waterproof PVA. For use on solid substrates such as brickwork, blockwork and concrete, in moderate exposure conditions. Product code: 252325. i dont really want to strip it all off and start again as im sure there is something i can do with it and with a bit of luck the answer will be in hear with all the tradesmen. blertsville, Jul 4, 2011. • Drying time of around three to four hours. K Rend). The render would or should have had a waterproofer added to the mix when rendered so it will be waterproof, as the render is new it is not necessary to apply a stabilising solution first, just use a hand brush to go over the surface to remove any dusty muck off the surface. im rendering onto concrete blocks on the outside of my new shed/workshop. . Question is 1. Hi there, I need to find a suitable, waterproof render for a wetroom. Features include multi-pockets, adjustable designs and reflective tape so that you can be seen. use feb rendamix with your render (also sold by screwfix) this helps waterproof the render you can render down to the ground but I would advise a gap between 1/2 to 1" with a flare at the bottom to push any rain away from the brick the gap. Does this sound good to you. OP, Now I can see why the fire wall and the stack have been rendered. £3. Glazing and frame sealants come in a variety of acrylic and silicone based sealants, used to keep your home free from water ingress. The range has been hand selected from established brands, who manufacture durable products. 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. Screwfix Community Forum. com. 3/when dry, three coats bitumen. For External Use. The exterior is rendered and i'm pretty sure its trapping water in the walls and just driving it in. These products are suitable for use on a variety of materials and can be applied by hand with minimal tools. The render goes right down to the ground outside. 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. Stores are open 7 days a week. We're getting a lot of confusing/conflicting information regarding painting it: How soon can it be painted (weather permitting of course, it's in Brecon) Sandtex tell me their products aren't compatible with PVA, therefore not to use it. I have used a slurry coat first of. 99. com. 99 Inc Vat. 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. No waterproofer in render scratch coat. 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). 99Inc Vat. Discussion in 'Painters' Talk' started by Joelfc89uk, May 24, 2018. EVeryone seems to have their own opinion and hardly. Jesus some ridiculous answers. Stops freeze thaw damage. I know when we do the top coat it's gonna suck the moisture out like crazy. Rendering of chimney. Heat-Resistant. I'm having to strip back and re render the walls where the shower is going as the plaster is poor and has been sealed with pva i think. Sika Proof improves the impermeability and absorption. 5m x 0. Reduce cracking and shrinking when mortaring with this SBR bonding agent from Everbuild. Screwfix Community Forum. Hi, I have an 1910 solid brick, no cavity built house that is all pebble dashed. Read more. FREE next day delivery available, free collection in 1 minute. FREE next day delivery available,. Click & Collect in as little as a minute. He came back and redid that area, and it leaks there worse than ever - it's just like a sponge. 2: Hydrophobic Coatings. Use a mixer and measure quatities using a bucket for consistency. When this is complete, lay the concrete floor with the membrane overlapping the tanking by a generous margine. Extremely durable and will adhere to any substrate for filling and repairs with no depth limit. Ideal for use on swimming pools, water tanks, ponds, below ground concrete, as well as for render and floor screeds for water resistant applications. 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. G4 Pond Sealer Clear. In 20 years of building and renovating, it has never been mentioned in our business. Let it dry for a couple days. Click & Collect. #2. Ok, I don't know what mix to use, whether to use PVA, or how much waterproofer to add - although all that stuff must be out on the interweb. giving a lighter easier to work gauge of mortar. Time is of the essence as access is via scaffold in my neighbor's yard and they want it gone. Sets in 20 minutes. Weber One Coat Base Render 25kg. FREE Click & Collect within 30 minutes. 49. 2 coats. AC50 Trade Acoustic Adhesive & Sealant 900ml. The. Suitable for new or renovated substrates, either unpainted or painted: gypsum plaster, old painted surfaces, cement, concrete, breeze blocks, bricks, stones, glass and glazed tiles. Show More. 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. 3N dense concrete blocks. Buy Cement Mix at Screwfix. all the best. I will be hacking off and re rendering the whole house, The time between hacking off and rendering, will the house be no longer “waterproof” and get damp inside if it rains?I've done some DIY plastering, but have no knowledge of rendering, so would anyone be able to help me out with some info, please? The bathroom walls were originally rendered half-way up, and its so hard to remove, I would like to leave the existing rendering in place and just add new render the remaining top half. 4/immediately the last coat is on and while still wet, blind with sand. This is especially important if you apply a thick traditional multi-coat plaster. 1. gauge everything put the water in the mixer then add the lime to the. Daveukleics Member. A. Went on white. Bostik 1kg Cementone Colours for Cement - Buff (47) £9. Screwfix Community Forum. PVA wall first. FREE next day delivery available, free collection in 1 minute. 1. Ideal for Use in Basements/Cellars but may also be Used as an External Coating for Concrete, Brick, Block & Bonded Renders. Hi Guys. Not available for delivery. drill driver, Jun 21, 2005. I will be using metal studs to make the framework and lining it in OSB3. Screwfix customers rate this product 4. Sika Waterproof Coating Grey 5kg (83502) (67) compare. Effective sealer for waterproofing damp walls. Waterproof PVA. Home Forums > Screwfix Community Forum > Builders. She got the guy back and he said 'oh well, it hasn't worked, you need the place tanking which. Long-lasting immediate fix. Covers approx. The wall is not tanked with any waterproof membrane. £3. Is vital that the waterproofer is added in the correct amounts according the the manufactures instructions. 250 cement board. There are many external finishes - Finedown (smooth as in photos), Tyrolean, Pebble dash etc. Morning all, I'm looking to render 3 garden walls, all made from 7. If you use an oil based paint, thin it 50/50 and use that as a cover coat. Sharp sand coarse and fine, lime and cement in 2 : 2: 1 :1 ratio for bottom coat ( scratch ) coat, with waterproofer. but the render is now well past its sell by date & is dropping off in lumps. What mortar mix, 3:1? ArthurFirstly internal walls do not need rendering with sand and cement but a base coat of plaster is used instead such as Bonding or Browning. The fact that it's a retaining wall means that it's going to be damp, almost by definition. It has many uses, and is suitable for most porous. Wall fillers and flexible fillers create a clean smooth and professional finish. The render on your house has cracked due to a number of reasons, it could of been done in poor weather, or not enough mechanical key. Sika Proof Liquid Waterproofing Admixture is a general purpose, ready to use, economic waterproofing admixture for mortars and concretes. 90min Approximate Setting Time. Render, Bricklaying and Floor Screeds. Thanks for the help Alastair. A complete crystalline solution for waterproofing masonry and blockwork. com. The render would or should have had a waterproofer added to the mix when rendered so it will be waterproof, as the render is new it is not necessary to apply a stabilising solution. Wait a few minutes, feel the pva. Cmd38 New Member. very big difference. Victor Lek Member. 1. Screwfix Community Forum. They do say that a suitable bonding agent could be applied prior to the render scratch coat. The correct method is as follows:- 1st coat (scratch coat) 3:1 sharp sand with waterproofer and scratched. These can be used for a range of projects, whether it is to create a flat a smooth surface with a compressive strength, preventing water and damp penetration in walls and. 2. PermaSEAL Renovating Plaster Bucket 20Kg. #2. It's like comparing a totally waterproof jacket costing £500 with a 'showerproof' jacket costing £25. FREE Click & Collect within 30 minutes. From waterproof adhesive to glass adhesive, it is important to choose the right glue for the job. The product can also be used to protect retaining wall structures. Good Luck. View all: Bostik Cement Mix. waterproofing paint. Depending on the ratio you used for waterproofer/water in your mix you should find that the render is virtually weatherproof. • Air entraining plasticiser • Prevents shrinking and cracking during curing • Water reducing • Chloride freeMortar plasticiser for stronger, easier to use brick and block-laying mortar. Can anyone give me advice on rendering over Medium Density Blocks for an external garage. com. ★★★★★ ★★★★★. horses for courses, take your pick!! good luck. Then sharp sand fine, lime, cement in 6: 1: 1 ratio as top coat. 5 Ltr. Seeking a bit of advice, been waiting for my plasterer to come and do my external rendering. Cold & Heat-Resistant. Most external decorative renders are painted, most have a combined waterproofer and plasticiser addidive in last coat. It sets to a rock-hard finish and can be overcoated in 24 hours. £13. Evening guys. Render up to (or very slightly below) the damp course, finishing with a 25° slope down and outwards from the dpc. External wall is rendered. Come back the next day if you like, and see what sort of waterfall you have running down the back of the wall. Covers up to 4m². You would usually add waterproofer to the scratch coat (base coat), & again to final/floating coat (top coat). PAGE 1 OF 2. Choose from rapid or fast set cement for small commercial or domestic jobs. As well as offering protection, exterior wall paint improves the appearance of a property by brightening it up and bringing it back to life. DIY_Has123, Feb 3, 2021. What depth should the battons for the scratch coat be? I was looking at 10-15 mm deep off the wall. Home Forums > Screwfix Community Forum > Builders' Talk > Is Artex Render Waterproof? Discussion in 'Builders' Talk' started by DIYDave22, Nov 8, 2023 at 5:34 PM. 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. Sets in 20 minutes. dj. i have a freshly scoured brick wall, having recently removed half an inch. Product code: 252325. Covers Approx. For Interior & Exterior Use. As per usual there are so many different videos etc on the web it can get confusing. I'm not expecting a smooth 'craftsmans' finish as other areas of render have a rough finish but look perfectly acceptable once painted. Suitable for the damp proofing of interior masonry wall surfaces. Over 40,000 products. One idea was maybe to do a slurry of waterproofer and render and paint in on with a brush and once that becomes tacky, to add the 1st coat / scratch coat? Not sure what product to use though for waterproofing purpose, pls advise! Cheers. UK call centre ready for your call 24/7. Out of stock. The paint has been fine until this very wet spring, when it started to bubble and peel in large random areas. Universal Protector Water-Repellent Spray. Order Bostik SBR Admixture White 5Ltr at Screwfix. Hello. Mastercrete has improved resistance to the cracks caused by freeze/thaw attack when compared to traditional cement. Leaving me a few mm to be skimmed. Ideal for emergency repairs, filling and patching. do i need to apply a thick scratch coat beforehand?? I was thinking of just applying a thin waterproofing mortar just to smooth pores in the block, joints etx, and apply this acryllic on top of. Don't try and apply render in one coat it will only sag and probably fall off wall. Click & Collect in as little as 1 minute. I use to put waterproofer in both coats, but some peeps on do scratch coat. com. Tarmac One Coat Renders can be applied with a trowel of float. Frame sealant is flexible and designed to withstand UV, weather and water exposure. 99. Buy Cement Mix at Screwfix. Overcoat 48-72 hours after application with any standard water-based masonry paint or mineral. 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. qwas123 Screwfix Select. Applied waterproof PVA. Buy Ready Mixed Plaster at Screwfix. KIAB Super Member. 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. Waterproof render for external earth retaining garden wall!!! Discussion in 'Builders' Talk' started by oggie78, Apr 7, 2009. Product Type. This is called Feeze-Thaw action, which allows more water in, gradually. Sharp sand coarse and fine, lime and cement in 2 : 2: 1 :1 ratio for bottom coat ( scratch ) coat, with waterproofer. Product code: 139057. hi what is the best mix ratio for rendering internal wall . There's render up to about one metre all the way around the room, then its a 'board & dab' job up to the ceiling. 400 ml. Weberend One-Coat Base Render (OCR) is a versatile pre-blended single coat application render, ideal for rendering brickwork, blockwork and concrete. Delivery 7 days a week. I’m doing the patio and the intention is to fill the void. 24 kg. Tapes suitable for a range of materials stocked. Phil. Click and collect in as little as 1 minute. 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. Should you wish to brighten up these surfaces then use the Weathershield masonry paint system (old render may require a coat of stabilising solution first). Handyandy - really Mr. 40. Just wanted to check what mixture of sand/cement I need to use for the render for this? is it Scratch coat of 4:1 sharp sand to cement and then top coat of 5:1 sharp sand to cement? Do I need to do any waterproofing? Looking to get something like in the attached. com. Try on a couple of places (bottom of wall more likely to have weak adhesion). #2. p) may be an overkill but this is how <u>PROPER</u> tanking should be done and hey better overkill now than taking it. For Interior & Exterior Use. Easy returns, with 30 day money back guarantee. ★★★★★ ★★★★★. Most external decorative renders are painted, most have a combined waterproofer and plasticiser addidive in last coat. Extremely durable and will adhere to any substrate for filling and repairs with no depth limit. However on the upside the materials that are available mean that working with sand and cement with added lime and waterproofer (for the record) and the ability to ashlar, and form all manner of quoins and window reveals/bands etc take far more skill than the average. waterproofing paint. There is a white crystal deposit under left on the exposed render. 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. Ensure wall is sound, clean and ready to receive HardieBacker®. Suitable for a Variety of Applications. Softwashing is the best way of cleaning your render. apply the sand and cement to above 1/4 inch of the existing. unfortunately came home yesterday and all covered in scratch coat with no waterproofer. Bostik Waterproof Cement Grey 10kg (58196) Bostik Waterproof Cement Grey 10kg. High bond strength. Will not corrode steel reinforcement (brick ties etc. 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. 5mm² Cables. com. I’m doing the patio and the. i know its best to take the wall back to brick,but should i add a waterproofer to the floating coat (common sense says yes) as per external render,and if so what type? i have'nt been. Forms a transparent, waterproof barrier. Click & Collect. Product Details. com. South Gloucestershire Technical Advise Leaflet : Lime Render 2 Introduction Render was originally used to provide a protective covering to stone or brickwork. Customer lives close to coast will the salt in the air have any impact on my. ssss64 New Member. Order Bostik SBR Admixture White 5Ltr at Screwfix. Masonry cream is snake oil, it does nothing. Scratch coat is 1 part cement, 1 hydrated lime, 5 plastering sand, with fibreglass mesh embedded. Home Forums > Screwfix Community Forum > Painters' Talk > Painting render. Finish second coat with sponge or wooden float. For picking up 1" use two coats of 1/2" each. Hazard safety codes: R22, R36, R38. 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. This waterproofer penetrates deep into the brickwork whilst still allowing the surface to breathe. 1. Prepare walls by straightening them out with a two coat render system and a waterproofer agent added to mix. Click & Collect. com. £9. You capture lots of potential issues in one go, including new ties and new DPC, and probably the opportunity for some insulation. Expect someone to come along with more modern alternatives. BEfore dry (as the instructions suggest), I was then going to render to approx 10mm with a 5:1 rendering sand:cement mix with a waterproofed within. Normally you put on a scratch coat of 4 sand to 1 cement ( plastering sand ) with feb, 2nd coat, float coat 5 sand to 1 cement, feb plus water. To ensure thorough waterproofing of your exterior walls, you need a coating that will actively repel water. Â New Member. 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. com. Interior Wood Paints. Discussion in ' Builders' Talk ' started by Fussy Spark, Dec 27, 2020 . As the title suggests is artex that you use to decorate ceilings waterproof?chillimonster Screwfix Select. Ideal for emergency repairs, filling and patching. Suitable for ceramic, porcelain and non-moisture. Primer Not Required. Suitable for a Variety of Applications. Contact the team today by calling 0161 509 9009 or emailing info@emperorpaint. The pointing needs raking out 25mm deep, and re-pointing with a 4:1 sand & lime mix. Delivery. Screwfix customers rate this product 4. PVA sealer is an extremely versatile, odourless, waterproof and non-toxic adhesive that is suitable for a multitude of tasks and requirements. Good shout? Also, not location of air bricks. Buy Roof Repair Products at Screwfix. You use a wire scratcher to form a key in this while its wet to form a good key for your second coat. Bostik Roof Repair Compound Black 1kg (57518) Bostik Roof Repair Compound Black 1kg. The paint has been fine until this very wet spring, when it started to bubble and peel in large random areas. 1 Year Guarantee. If it's a cavity, before you go down the render route, go find a builder and ask him how much to rebuild the outer skin of the end gable wall. com. 3. Order Sandtex Quick-Dry Stabilising Solution 5Ltr at Screwfix. 1. I have used a slurry coat first of. Pieces in Pack/Case. Insulates and protects wiring. Suitable Application. . Order No Nonsense Anti-Crack Acrylic White 310ml at Screwfix. Odourless & Solvent-Free. I have seen many threads about lime / no lime and whether you should waterproof on the scratch coat / finish coat etc etc. As it dries then rough up the surface to match the surrounding render. 5°C. I am after some advice if poss. shazauk New Member. 6/5. A waterproof render is more a damp proofer than a waterproofer.