I have waterproofer and unibond. Considering the size of the job I'll just use the stuff from Screwfix for this. 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. Also for repairing cracks and damaged stone edges. 99Inc 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. • High water and rain resistance • Water reducing • Provides long term water protection• Chloride free New Sika sku available (code 98821)Long term water protection to mortar, concrete and rendering. Â New Member. 1. Scrape off as much as you can and let it dry-out naturally, which could take a long time, before attempting to redecorate. Screwfix customers rate this product 5/5. £6. Render Waterproofer. PVA is a water-insoluble resin which is typically white at the point of application, but dries colourless and has a high bonding strength. My question is what do I need to do to the surface to prime/seal it before the top coat? I intend to finish off with a Dulux exterior weathershield paint. Then simply follow the manufacturer's painting guidelines perfectly. 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. Provides perfect adhesion without the use of a primer, even on damp substrates. Fast-Drying. com. Ideal for emergency repairs, filling and patching. FREE next day delivery available, free collection in 1 minute. 35°C. , Feb 26, 2008. Using a small grinder, cut out all loose chunks of render - & open all sketchy cracks. Cut back on the admix a little, mix it up stiffish then allow the drum turn for five minutes and let the admix do its stuff, the mix will reach a nice wet consistancy after a few minutes. i have a freshly scoured brick wall, having recently removed half an inch. Everbuild’s Black Jack paint is perfect for. 88 Inc VAT-+ Add to Basket. . I am after some advice if poss. View all: No Nonsense Water Seal. 99Inc Vat. This is an interior wall but yes its a wall with a window and other side is exterior. Ideal for locations such as basements and cellars or for external coating for concrete, brick, block and bonded renders. Just soak the walls with a hose pipe scratch with a mix of 4:1 plastering sand : opc and float with 5:1:1 plastering sand : opc : lime, with waterproofer dosed in your butt. The range has been hand selected from established brands, who manufacture durable products. , Apr 8, 2005 #2. I use to put waterproofer in both coats, but some peeps on do scratch coat. Delivery. Buy Fixings & Fastenings at Screwfix. 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. The correct method is as follows:- 1st coat (scratch coat) 3:1 sharp sand with waterproofer and scratched. Weather-Resistant. chillimonster Screwfix Select. Most can be used on all common surfaces, and as a decorative trim or door paint. waterproof finish of say, a gloss paint, and finding that underneath is very soluble. 90m x 50mm. com. If the wall is dry (unlikely this year!) lightly damp it without soaking it completely before applying the. Ideal for emergency repairs, filling and patching. 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. ★★★★★ ★★★★★. Exterior decorators acrylic for sealing around exterior window and door frames in most building substrates. Adheres to damp masonry and is weather-resistant. 2017 #2. £13. 3N dense concrete blocks. Order online at Screwfix. He rendered approx two square mtres at a time before applying dash. the problem comes because one of the old walls has the damp course below of extension. Let it dry for a couple days. com. Delivery. co. For Cement Based Mixes. Can be applied onto a damp. Hi, My extension was built and rendered using a sand/cement render around 4 years ago. com. 1. Mix approximately 4 to 5 litres of water per 25kg bag using an electrically driven mixer until you achieve a workable consistency. 4m²/Ltr. ★★★★★ ★★★★★. yesterday morning i put on a scratch coat, with rendering sane and castle cement ( ordinary portland cement it say in the bags) i used a 5-1 mix and i mad sure but using buckets, normally i would cut a bag in. Light Grey. 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). Don't use sharp, builders merchants do plastering sand just tell them thats what you need. Our team of experts are on hand to help you at every step of the process. 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. dougalhouse Member. Need some professional advice on waterproofing my 3ft garden flowerbed retaining wall. The biggest problem with a single-skin external wall is condensation which most people confuse with rising damp. AC50 Trade Acoustic Adhesive & Sealant 900ml. good heavy scratch will help to reduce the suction, dont leave the floating coat after the scratch too long, very important that you reduce the suction or your. Hi, I wonder if anyone can help/ offer some advice as we’re at our wits end. 8. com. Should be ok to overpaint SBR with masonry paint. 99Inc Vat. . Pieces in Pack/Case. poolthetool is spot on. In my experience you can take of the damaged parts and patch in, but personally I would take it all off and start again, making sure that a good key is achieved in the scratch coat (1st coat of render). Light Grey. Scratch the coats with a scrating tool looks a bit like a large afro comb or make one with a bit of batten and some nails. A nightmare rendering on smooth lightweight blocks, hate it. Cold & Heat-Resistant. One Coat Render can be used For interior and exterior use and has been formulated for single coat. One Coat Render is a high quality, pre-blended formulation, for single coat application reducing total drying time. 96 per L . Screwfix customers rate this product 4. Mix it strong say 3:1:1 or 3:1 plus plasticiser. Hazard safety codes: R22, R36, R38. Often soft in texture, when applied these substances harden. Mr. Handyandy, Oct 23, 2005. £7. Do i use waterproofer in both the base render and top render? My plan was to prime the brick first with 3:1 unibond and then 1:1 unibond as i offer up the base render. Walls are old super dense concrete blocks. waterproofing paint. I then intend to paint on something called a cementone aquaprufe, which is a cold applied bitumen to the wall, and then finally dot and dab standard 12. p) may be an overkill but this is how <u>PROPER</u> tanking should be done and hey better overkill now than taking it. 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. Tarmac One Coat Render is a pre blended render that can be applied in one coat for patch repairs or larger rendering projects. Rake out the brickwork joints (say 5mm) to give the render something to 'hang on' to. Fast-Drying. Buy Cable Sleeving at Screwfix. Click & Collect in as little as a minute. Provides a hard wearing, protective layer on wood, metal and cement. Apply directly to damp surfaces. giving a lighter easier to work gauge of mortar. 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. Screwfix customers rate this product 4. £179. Order Bostik General Purpose Mortar Grey 5kg at Screwfix. She got the guy back and he said 'oh well, it hasn't worked, you need the place tanking which. VAT) Quick. This would be better off in plastering forum. £12. 54 Inc VAT. dj. ex. Im nervous about it cracking so please can you confirm the correct mix to use. It Is single skinned and with render onto boards which were lined with fibreglass mesh. Click & Collect. 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. ★★★★★ ★★★★★. My sister had her coal cellar done last year, and the guy used Sika 1, then rendered and plastered over it. PAGE 1 OF 2. Microseal Technology. 2. common sense tells you that this system will go nowhere and it wont. Primer Paints. Order online at Screwfix. SBR modified render will probebly be good enough soverine chemicals also do a product called K11 I think never used it but told by one who had it worked a treat,Otherwise, admixes can give some increased protection against water ingress for external render, or try a cement based render for the inside bay, which should keep water at bay moreso than plaster. £18. Screwfix customers rate this product 4. blertsville, Jul 4, 2011. The wall is hollow concrete block, backfilled with concrete and reinforced to some rather substantial footings. very big difference. Low Odour. Cmd38 New Member. The fine aggregates are suspended in a unique waterproof polymer to ensure easy application by roller or brush. This ready to use Sikagard facade from Sika is a water based impregnation emulsion. Fine. 250 cement board. Never heard of the 4 weeks / mould thing before. Two thin render coats. Will this be enough. koolpc and SeaJay like this. + fill all gaps with new expanding foam. Write a review. Still I`d be interested to hear other peoples approach. 25 Year Waterproofing from a Single Coat . Render up to (or very slightly below) the damp course, finishing with a 25° slope down and outwards from the dpc. Neville the tap dancing gibbon, Sep 2, 2006. Buy Roof Repair Products at Screwfix. 25 Inc Vat. Volume. Â, Dec 1, 2007. These products are suitable for use on a variety of materials and can be applied by hand with minimal tools. Try on a couple of places (bottom of wall more likely to have weak adhesion). For Fixing, Sealing & Binding. Screwfix customers rate this product 4. UK call centre ready for your call 24/7. Best chech out the additive that has been used with the manufacturer. 99 Inc Vat. He advised waterproof PVA. We stock Everbuild PVA, ideal for use as a contractors PVA due to its high strength. It will also be 'attacked' on its front face if the render is in contact with the soil/lawn - so it might be best to have a 100mm gravel trench at the foot of the wall (or. ★★★★★ ★★★★★. 5Kg. Hi Guys. Is vital that the waterproofer is added in the correct amounts according the the manufactures instructions. Customer lives close to coast will the salt in the air have any impact on my. Rapid-setting waterproof cement. PVA wall first. Will depend on the type of silicon, and will only work with oil based paint. Mix it at 5-1 sand - cement with waterproofer. They have for example render products which are waterproof, yet breathable. 30 day money back guarantee. com. In December I had a 2 foot earth retaining wall built in my garden to separate the garden from the patio. For a clear coating over bricks to allow. In fact, cracks are still appearing now, nearly a year on. Delivery 7 days a week 60 days free credit available. 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. Discussion in ' Builders' Talk ' started by roger waters, Sep 11, 2006 . Product Type. The pointing needs raking out 25mm deep, and re-pointing with a 4:1 sand & lime mix. Substrates which are highly absorbent or gypsum must be pre-treated with Primer G (usually diluted with water at a ratio of 1:1 or 1:2 to ensure thorough penetration). Is either expanding foam, or white silicone OK in this situation (inside of course, render with waterproof mix on the. the waterproofer will not work!!!!!the top coat must be at least 6 parts WASHED sharp sand 1 part lime 1 part cement {opc}. Water Seal. £ 24. 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. 1. Ask a question. Order online today. 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. Extra Rapid Cement is supplied in weatherproof and tear-resistant plastic bags. Additional information. If you don`t want waterproofer at least use a plasticiser or lime. Brickie might. We would like to show you a description here but the site won’t allow us. For Fixing, Sealing & Binding. From what I’ve read on this very helpful forum, it’s a water/salt problem. 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. Mix was about the same consistensy as for laying bricks. VAT £6. I’m doing the patio and the intention is to fill the void. com. View all: Bostik Specialist Paints. 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. RECOMMENDATIONS:Alchemy Plastering. KA Tanking Slurry is the complete crystalline solution to waterproofing masonry and blockwork. 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. When this is complete, lay the concrete floor with the membrane overlapping the tanking by a generous margine. 99 Inc Vat Click & Collect Not available for delivery Buy Bonding Agents at Screwfix. Order online at Screwfix. Mr. The inside of the wet solid walls seems to covered in wet sand and a black paint type substance as in the photos. Home Forums > Screwfix Community Forum > Painters' Talk > Painting render. Ricky Johnson New Member. £21. Provides superb weather protection for bricks, mortar and concrete. Hazardous Product – Not available for Mail Order/ TCND outside of Mainland UK. Fischer FIS V Zero 300T Injection Mortar 300ml (498HL) compare. £9. I have heard i need building paper and mesh before i render. 1 Year Guarantee. 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. South Gloucestershire Technical Advise Leaflet : Lime Render 2 Introduction Render was originally used to provide a protective covering to stone or brickwork. weakening its bond with the brickwork/render. Tapes suitable for a range of materials stocked. The pointing needs raking out 25mm deep, and re-pointing with a 4:1 sand & lime mix. 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. Applying the board directly onto the membrane with thin adhesive and mushroom fixings. The the final coat - 5 sand 1 cement NO WATERPROOFER just feb. uk. FREE next day delivery available, free. Frame sealant is flexible and designed to withstand UV, weather and water exposure. Option No. Order online at Screwfix. There are many external finishes - Finedown (smooth as in photos), Tyrolean, Pebble dash etc. DIYDave22 New Member. As the title suggests is artex that you use to decorate ceilings waterproof?chillimonster Screwfix Select. 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. I have used a slurry coat first of. Supplied in a graduated bucket. Use it as a bonding agent, primer, sealer and. Product code. At minimum, the rear of HardieBacker® 250. Completed an extension last summer and the exterior walls were cement rendered the usual way with waterproofer etc. 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). It sets to a rock-hard finish and can be overcoated in 24 hours. 5 apply new finish. #10. 99 Inc Vat. Order online at Screwfix. 50/Kg)Product Details. Using 4 :1 first coat and 6:1 second with waterproofer. Sika Bond SBR+ Waterproof Bonding Agent and Mortar Admixture - 25L (6) £99. Bostik Roof Repair Compound Black 1kg (57518) Bostik Roof Repair Compound Black 1kg. Handyandy Screwfix Select. The paint has been fine until this very wet spring, when it started to bubble and peel in large random areas. It's like comparing a totally waterproof jacket costing £500 with a 'showerproof' jacket costing £25. Designed to function against water penetration in various conditions, it can be used in foundation slabs, tunnels,. Product code: 252325. 90min Approximate Setting Time. Covers up to 4m². Febtank Super is a high performance tanking slurry for masonry and concrete. Need to paint render which was applied about 4 years ago apparently with waterproofing element included. For extra certainty use a render bonding agent such as Sika Rendagrip as a priming coat. Secondly, if you did render them then a finish coat of plaster would be nigh on impossible to get right as sand would inevitably break away from the render into the top coat as the plaster is applied. com. Pay your way. Once Stormdry has been applied to the wall surface in a single coat and will permeate deeply before curing to form a. Search Activating the button will move focus to the expanded search input fieldContains primer, coating and waterproof jointing tape. ★★★★★ ★★★★★. 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. With 10mm for the scratch coat and 8mm for the top coat. Question is 1. that's why i am kind of believe the exterior wall is vulnerable to weather conditions. G4 Pond Sealer Clear. Everbody have different ideas for the perfect render mix, I usually do 1st coat (scratch coat) 3:1 sharp sand with waterproofer, 2nd coat (floating coat) 4:1 sharp sand with waterproofer. 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. Will fill without depth limit and repair without formwork. I have been trying to use sand and cement with waterproofer (everlast) to level it out but unsure if I'm doing it right. If you bought the paint you can get a refund on it. the waterproofer will not work!!!!!the top coat must be at least 6 parts WASHED sharp sand 1 part lime 1 part cement{opc}. (the actual water drainage path, which looks like its made of half a sewer pipe is actually in good condition, so its only the. FREE next day delivery available, free collection in 1 minute. FREE next day delivery available, free collection in 1 minute. Most external decorative renders are painted, most have a combined waterproofer and plasticiser addidive in last coat. So I think the order from inside to outside should be:- inner skin, waterproof membrane, studding, insulation, blockwork and then your render. Volume. ** Edit ** just ordered the Screwfix stuff as the reviews looked really good and now I've got the say-so from Vinn that it'll work then that'll do for me!Order online at Screwfix. Apply with Brush or Roller. This is especially important if you apply a thick traditional multi-coat plaster. rogerk101 Screwfix Select. Click and collect in as little as 1 minute. Delivery Next day available. Does any one else have the nightmare of render falling off in patches once the. Give them a good scrub or pressure wash and tidy up the pointing. This'll make sure it's drawn into the render to provide a nice primed surface. High performance waterproof treatment for exterior. Phil the Paver Screwfix Select. Choose this handy pre-mixed sand and cement render from Weber to cover brickwork, blockwork, concrete and other suitable surfaces. £17. 25 Year Waterproofing from a Single Coat . This not painted at the time as suspected water ingress problem however this issue now resolved. 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. Login to save for later. Screwfix - Rapid-setting waterproof cement. but the render is now well past its sell by date & is dropping off in lumps. Scratch coat is 1 part cement, 1 hydrated lime, 5 plastering sand, with fibreglass mesh embedded. 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. 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. There are various types for different applications, including quick single coat options. 99Inc Vat. 80. €28. By getting the finish coat on within 8. The wall is an external leaf, subject to high prevailing salty winds and has had dampness for years. You might wonder why you need two (or more) coats. com. Not if you’re using lime, paint a waterproofer on after Watch the weather, spray bottle at the ready keep it damp, and don’t curse when the scratch coat cracks Abrickie , May 21, 2020Plumbcrazy New Member. Run a hose against it. 99 Inc Vat. Sika Proof Liquid Waterproofing Admixture is a general purpose, ready to use, economic waterproofing admixture for mortars and concretes. Home Forums > Screwfix Community Forum > Builders' Talk > Waterproofing. I know this is not the best route to go in waterproofing a wall normally. Designed to be used for plasterboard internal corners. Temporary repair required because house goes on market in 10 days time and I dont think I will be able to get anyone in before then (Oxford). On dense, less absorbent brickwork or render, coverage of the brick waterproofer can be increased by up to 10m² per litre. Ask a question. INNER WORLD DESIGN & BUILD LIMITED. You can do it. 99. Over 40,000 products. I'm not expecting a smooth 'craftsmans' finish as other areas of render have a rough finish but look perfectly acceptable once painted. Time is of the essence as access is via scaffold in my neighbor's yard and they want it gone. Ive been told 3:1 (2 parts sharp, 1 part builders sand) and not as wet as mortar for bricklaying. Float at 5:1:1 Builders sand : OPC : LIME with waterproofer in the water How does that sound? 2. com. 400 ml. This is called Feeze-Thaw action, which allows more water in, gradually. 8. This process is best carried out using a pumping system and water fed pole with a brush attachment. . They do say that a suitable bonding agent could be applied prior to the render scratch coat. Do what the gardener should have done. whats a good method to clean off the scratch coat which has been exposed for some years and is. Sanitary Fixings Kits. 4 use mechanical fixings to fix this system to the wall. . 49Inc Vat. Can anyone tell me which is the best silicon based waterproofer they have used for waterproofing an exterior stone wall. Out of stock. Total Product Weight. blertsville, Jul 4, 2011. This would improve the temperature somewhat, reduce any condensation and also allow the wall to breathe thanks to the studded membrane. 95 Ex VAT. Tarmac One Coat Renders can be applied with a trowel of float. Delivery Next day available. FREE next day delivery available, free collection in 1 minute. Advice on mix varies. Click & Collect. 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. The proceedure is:-. Bonding is not a good idea on external walls, it attracts water to it. 40. I've slapped a PVA solution to brickwork on internal walls prior to render, I GUESS that this situation is no different.