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. Order online at Screwfix. You could have asked the plasterer to add a waterproofer to the render mix, but it's obviously too late now. Extremely durable and will adhere to any substrate for filling and repairs with no depth limit. It is supplied in the form of a deeply penetrating cream that is applied to the wall surface using a roller or brush. Phil the Paver Screwfix Select. Softwashing is the best way of cleaning your render. Is either expanding foam, or white silicone OK in this situation (inside of course, render with waterproof mix on the. Forms a transparent, waterproof barrier. FREE next day delivery available, free collection in 1 minute. Â, Dec 1, 2007. 1:20 rather than the more dilute 1:40 option. Often soft in texture, when applied these substances harden. You shouldn't use PVA for external render however they do make an external grade one but this isn't necessary. 3N dense concrete blocks. 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 scratch will turn to dust when it dries out too fast. Masonry cream is snake oil, it does nothing. 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. unless you do a lot of good drainage behind it and seal it with something more waterproof than render. The lime render was there for a reason, its breathable, lobbing in cement isn't a good idea, it may cause problems with moisture depending on the wall, you can buy a lime render mix. May produce an allergic reaction. 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. #3. 69. The wall is hollow concrete block, backfilled with concrete and reinforced to some rather substantial footings. Light grey colour when dry. Come back the next day if you like, and see what sort of waterfall you have running down the back of the wall. com. PAGE 1 OF 2. My builder is advising to render and d&d, but this seems like more work to me for no real reason. DIY_Has123, Feb 3, 2021. it is a little tired in. 45/Kg) Once that dries, I can then apply 2 coats of render (scratch + 2nd coat). 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. 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. (£1. 7 litres of SBR per 25kg bag of cement to give a totally waterproof render. FREE Click & Collect within 30 minutes. 49. Its faced brickwork which has been painted, plan is to bead it, mesh it ist coat 4:1 with waterproofer 2nd coar 5:1 no waterproofer. Generally, 5 litres of SBR per 25kg bag of cement in an external render for an area of normal exposure. Discussion in ' Builders' Talk ' started by roger waters, Sep 11, 2006 . 99Inc Vat. Buy Aggregates & Chemicals at Screwfix. 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. Show More. Good Luck. com. There are various types for different applications, including quick single coat options. View all: No Nonsense Water Seal. The traditional two coat rendering on a porous surface, i. Home Forums > Screwfix Community Forum > Builders' Talk > Rendering. Seeking a bit of advice, been waiting for my plasterer to come and do my external rendering. 49Inc Vat. Search Activating the button will move focus to the expanded search input fieldContains primer, coating and waterproof jointing tape. I have seen many threads about lime / no lime and whether you should waterproof on the scratch coat / finish coat etc etc. i have a freshly scoured brick wall, having recently removed half an inch of old powdery paint layers. I'm no pro on this, but have done a lot of research into it. The real question is is galvinised mesh ok. PermaSEAL Renovating Plaster Bucket 20Kg. 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. 5 kg. 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. 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. Can anyone give me advice on rendering over Medium Density Blocks for an external garage. 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. Designed to be used for plasterboard internal corners. B) To seal around the bathtub - I am planning on using the Schluter Kerdi TS Bath and Shower Sealing Kit. 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. waterproof finish of say, a gloss paint, and finding that underneath is very soluble. 8m)above newly-fitted french doors to render. So it'll be damp from behind (penetrating damp) and damp from below (rising damp), so not much to be gained by. KIAB, Sep 18, 2015. (76 products) Aggregates and Chemicals are the components of a composite material which will resist stress providing a bulk to the composite material. Order online at Screwfix. When dry paint to match. South Gloucestershire Technical Advise Leaflet : Lime Render 2 Introduction Render was originally used to provide a protective covering to stone or brickwork. Seeking a bit of advice, been waiting for my plasterer to come and do my external rendering. 35°C. Is there anything I can do now. Suitable for a Variety of Applications. Completed an extension last summer and the exterior walls were cement rendered the usual way with waterproofer etc. Can be applied onto a damp. DIY_Has123 Active Member. From what I’ve read on this very helpful forum, it’s a water/salt problem. 90 Ex VAT. Render up to (or very slightly below) the damp course, finishing with a 25° slope down and outwards from the dpc. You've done the right thing by removing the render to above the DPC, if yo rendered the lower apart again you'd have to leave a 1" gap which would fill with crud and lead to the DPC being bridged again. Apply a bitumen or Pitch Epoxy coating from the outer edge of your 'slope' all over the existing dpc and up the wall 150mm. Screwfix Community Forum. UK call centre ready for your call 24/7. Pieces in Pack/Case. Discussion in 'Builders' Talk' started by questioner, Jul 6. you can hose down the scratch coat just before you. Suitable for 127mm Wide Coving. This is the only part on the whole house which shows this and I belive I. 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. Adheres to damp masonry and is weather-resistant. Coverage: Approximately, 1 litre of SBR per sq metre at. We encourage you to debate the topics and issues of the day in a friendly manner, whether related to trade/DIY or not. Extremely durable and will adhere to any substrate for filling and repairs with no depth limit. Available in a variety of options. VAT. 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. Light grey colour when dry. 3-layer spun-bonded waterproof membrane with excellent tensile and tear strength. Order online at Screwfix. waterproofing paint. Interior Wood Paints. B. Contains primer, coating and waterproof jointing tape. 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. Mix was about the same consistensy as for laying bricks. In terms of damage to your external walls, if any water that has gotten into your brickwork freezes, it will expand outwards within the brick, creating cracks (or more cracks) in your brickwork. Rendering of chimney. The fine aggregates are suspended in a unique. 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. Create a smooth base. I usually rule it off,fill the hollows and then leave it until it starts to get firm (dependent on the background I know). Product Details. 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. 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. If you bought the paint you can get a refund on it. Hazardous Product – Not available for Mail Order/ TCND outside of Mainland UK. Done a good job apart from i didn't put waterproofer in. B&L, Choose one or the other. Microseal Technology. Choose this handy pre-mixed sand and cement render from Weber to cover brickwork, blockwork, concrete and other suitable surfaces. Find directions and contact info, read reviews and browse photos on their 411 business listing. Can be brushed or spray applied. )As long as you have good key you could get away with one coat say 10 mm thick. 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. dj. It sets to a rock-hard finish and can be overcoated in 24 hours. Choose from rapid or fast set cement for small commercial or domestic jobs. com. (former damp problems)And install 22mm insulated plasterboard over that. Primer Not Required. 50/Kg)Product Details. Can I tile onto render that has been made up with plastering sand and Sika1 waterproofer or should I plaster then tile?but im having a nightmare. But i have a job to do, and i am considerong using sbr bond on it first, as im always interested in new methods. Everbuild Solvented Grab Adhesive 350ml (6048H) (245) compare. Chemical dpc's are used as a cost cutter and are not really as good as people make you believe. £13. I have followed the general advice given, 4 : 1 sharp sand / cement with the recommended amount of combined water-proofer / placterciser for good measure for the scratch coat. Ideal for emergency repairs, filling and patching. 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. Is Artex Render Waterproof? Discussion in 'Builders' Talk' started by DIYDave22, Nov 8, 2023 at 5:34 PM. Im an old skool plasterer ( 34 years old ) And when i am rendering i use sand,cement and waterproofer/feb. 41 Per unit £1. Extra Rapid Cement is supplied in weatherproof and tear-resistant plastic bags. Screwfix Community Forum. Sika Waterproof Coating Grey 5kg (83502) (68) compare. • Apply in temperatures from +5°C to +25°C. If you arent going to paint over it then put the water proofing agent in the top coat. This time, its butting up against 12mm plasterboard (painted) which was dabbed directly to the brick (no render). £ 14. Login to save for later. I wouldn't bother with grinding the wall either just scratch 4-1-1 sand-cement-lime with waterproofer. Nail straight pieces of timber vertically & horizontally as required to external corners, window & door reveals. . 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. It is a solution for nothing. 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). Primer Not Required. So you need to fit a waterporoof membrane undernearth your inner skin over the studding. com. Screwfix Community Forum. Stormdry Masonry Protection Cream is a colorless waterproofing cream for application to brick, stone, mortar, render and masonry. Delivery Next day available. 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. For a clear coating over bricks to allow. 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. So I think the order from inside to outside should be:- inner skin, waterproof membrane, studding, insulation, blockwork and then your render. 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. Ask a question. Screwfix customers rate this product 4. Wire brush the exposed walls to be sure that there is no mould on the. This Everbuild 402 Water Seal is a sealant that stops water wear on brickwork, stone masonry, concrete, pebbledash and other exterior walls. 8. Extremely durable and will adhere to any substrate for filling and repairs with no depth limit. Order Fabsil Universal Protector Water-Repellent Spray 400ml at Screwfix. Waterproofing Block Building. koolpc and SeaJay like this. For interior and exterior floor and wall installations. EVeryone seems to have their own opinion and hardly. 25 Year Waterproofing from a Single Coat . Using 4 :1 first coat and 6:1 second with waterproofer. Suitable for new or renovated substrates, either unpainted or painted: gypsum plaster, old painted surfaces, cement, concrete, breeze blocks, bricks, stones, glass and. The Bonding coat should not be allowed to dry before application of the render or plaster. Im asking for some advice on the best way to repair this. Mixing: Add the SBR undiluted to the mix and then adjust the consistency with clean water. On dense, less absorbent brickwork or render, coverage of the brick waterproofer can be increased by up to 10m² per litre. Overcoat 48-72 hours after application with any standard water-based masonry paint or mineral. This would be better off in plastering forum. PVA Sealers. 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. Exterior decorators acrylic for sealing around exterior window and door frames in most building substrates. Mix it at 5-1 sand - cement with waterproofer. 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. It has many uses, and is suitable for most porous. Delivery. Buy online & collect in store in as little as 1 minute. ★★★★★ ★★★★★. If you are going ot paint it, use a. 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. Thermalite hedge their bets somewhat on their finishes section. Forms a transparent, waterproof barrier. 4 use mechanical fixings to fix this system to the wall. High bond strength. 4:1 with morticiser for scratch you can float next day with 5:1:1 sand, cement, lime + waterproofer in water butt. poolthetool is spot on. Hang on, it's going white again. Buy Cement Mix at Screwfix. Hi i've built some raised flower beds / planters out of dense concrete blocks. Read more. 99 Inc Vat. SKIP19C THOMPSONS WTRSEAL ULTRA WTRPRFG. Sandtex masonary paint is top notch, waterproof and flexible so as long as its put onto a good base (hence the Satabliser solution first), it would do the job and look great. Single application waterproofing compound for emergency repair and general maintenance of most roof types. today he's applying top coat with no waterproofer. Considering the size of the job I'll just use the stuff from Screwfix for this. This would improve the temperature somewhat, reduce any condensation and also allow the wall to breathe thanks to the studded membrane. 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). Jesus some ridiculous answers. As the title suggests is artex that you use to decorate ceilings waterproof?chillimonster Screwfix Select. Render, Bricklaying and Floor Screeds. Product Type. Ask a question. Fill holes and cracks with ease, suitable for many applications. Then sharp sand fine, lime, cement in 6: 1: 1 ratio as top coat. #2. Fischer FIS V Zero 300T Injection Mortar 300ml (498HL) compare. I've slapped a PVA solution to brickwork on internal walls prior to render, I GUESS that this situation is no different. The PVA glue can be dilated up to 5:1 with water for maximum use. £49. £ 14. Will not corrode steel reinforcement (brick ties etc. For picking up 1" use two coats of 1/2" each. This is to avoid spraying the chemicals which can then drift in. ex. com. Waterproof. Change the physical properties of building chemicals to suit the job. PVC Construction. 5/1 sand & cement if the house is that old i would add a waterproofer too. sharp is for screeding. Wait several hours until the coating of Primer G is completely dry. Any thoughts anyone? Plumbcrazy,. KA Tanking Slurry is the complete crystalline solution to waterproofing masonry and blockwork. 1/ clean all walls of loose material. 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. com. Dow 791 Weatherproof Silicone Sealant Anthracite 310ml (44836) (42) compare. Best chech out the additive that has been used with the manufacturer. TDav Member. 99Inc Vat. I would get your render on soon so the block work can dry out. Domestic & commercial use. 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. Construction Project Manager, May 29, 2015. Scrape off as much as you can and let it dry-out naturally, which could take a long time, before attempting to redecorate. Febtank Super. 99 Inc Vat. Is unibond OK 2. He came back and redid that area, and it leaks there worse than ever - it's just like a sponge. Will fill without depth limit and repair without formwork. Currently in Stock. Hi, I wonder if anyone can help/ offer some advice as we’re at our wits end. View all: Bostik Specialist Paints. No waterproofer in render scratch coat. Ideal for locations such as basements and cellars or for external coating for concrete, brick, block and bonded renders. Discussion in 'Builders' Talk' started by Pagloss, Apr 6, 2006. The proceedure is:-. com. Free returns. Latest Offers At Screwfix. 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. ssss64 New Member. Home Forums > Screwfix Community Forum > Painters' Talk > Painting render. Order online at Screwfix. #2. 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). com. com. There are only three walls as it backs on to to a neighbours shed. 95 Ex VAT. 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. Low Odour. weakening its bond with the brickwork/render. too much suction 4:1 will do you. . Don't try and apply render in one coat it will only sag and probably fall off wall. I wouldn't re-render - leave the bricks open to the air. Home Tags > waterproofer. Ideal for use on swimming pools, water tanks, ponds, below ground concrete, as well as for render and floor screeds for water resistant applications. The waterproofs range offers you a selection of colours and sizes to suit your needs while keeping you dry throughout your working day. I'd get rid of the rusted steel regardless of what you do (unless you tile) as it will bleed through render etc BMC2000 , Oct 10, 2017Hah. alrite mate, if the blocks bricks are sound(no cracks in joints or the bricks)you should wet down the surface(not to much)then scratch coat using a waterproofer and plasticiser,either when this has took up enough or the next day apply second coat again using plasticiser and you should be ok!(plasticiser helps retain air in the mix and. Most can be used on all common surfaces, and as a decorative trim or door paint. Try on a couple of places (bottom of wall more likely to have weak adhesion). For Cement Based Mixes. 1 waterproof additive put into the mix, only other option to guarantee know more damp is th hack off internal plaster work, apply vandex over all exposed brickwork, sand cememnr then plaster, damp will be gone for ever. Strong fibreglass mesh tape that helps reinforce plaster coating and protects it from cracking. Water & Weather-Resistant. Also with spring weather being variable in temperature, would you recommend covering. Not available for delivery. 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. £30. Apply a bitumen or Pitch Epoxy coating from the outer edge of your 'slope' all over the existing dpc and up the wall 150mm. Phil the Paver, Nov 22, 2014. Handyandy Screwfix Select. Many can be painted over to match the colour of your windows or frames. only one left wet. Cement based coating for preventing water and damp penetration in walls and floors. the problem comes because one of the old walls has the damp course below of extension. 45 Inc Vat. Building a stud wall with a damp-proof membrane and insulating it. 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. 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. Discussion in 'Builders' Talk' started by Gary hunt, Oct 23, 2016. If you don`t want waterproofer at least use a plasticiser or lime. Acrylic frame sealant is ideal for internal use to fill. Covers up to 4m². Dig out the soil behind the wall, put a sheet of dpm against the wall, drill through the wall at low level every metre and fit a pipe to act as a drain hole, part fill the trench with grave, put soil in the rest, trim the dpm to ground level and re-render. Over 40,000 products. Inc. Home Forums > Screwfix Community Forum > Builders. Weather-Resistant. (£1. Will depend on the type of silicon, and will only work with oil based paint. 5. the waterproofer will not work!!!!!the top coat must be at least 6 parts WASHED sharp sand 1 part lime 1 part cement{opc}. Tarmac Once Coat Render is a pre blended render, just add water to apply. 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. In December I had a 2 foot earth retaining wall built in my garden to separate the garden from the patio. We were looking at using a product like K-rend up to the coping stones. Write a review. Reduces water penetration without acting as a vapour barrier. Ricky Johnson New Member. View all: Mapei Shower Waterproofing Kits. It incorporates a Polymer bonding aid allowing the results. Discussion in ' Builders' Talk ' started by Fussy Spark, Dec 27, 2020 . It's like comparing a totally waterproof jacket costing £500 with a 'showerproof' jacket costing £25. Waterproof render for external earth retaining garden wall!!! Discussion in 'Builders' Talk' started by oggie78, Apr 7, 2009. 99. Light Grey. The paint has been fine until this very wet spring, when it started to bubble and peel in large random areas. View all: Bostik Specialist Paints. DIY_Has123, Feb 3, 2021. If you use an oil based paint, thin it 50/50 and use that as a cover coat. I don't trust my builder and although he assured me he put waterproof additives within the render I do not believe him. Its a painted concrete block wall, about 60m by 2m. 48. gauge everything put the water in the mixer then add the lime to the 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. com. I would check adhesion using a piece of rubber, the type used for door stops (screwfix p118), glue it with superglue (allow to cure) rip it off and see what gives. Ideal for emergency repairs, filling and patching. 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. PVA is a water-insoluble resin which is typically white at the point of application, but dries colourless and has a high bonding strength. Damp walls can cause salt deposits to appear – these can blow your plaster. Low Odour. Simple to use, just mix with water. PVA sealer is an extremely versatile, odourless, waterproof and non-toxic adhesive that is suitable for a multitude of tasks and requirements. When diluted with water it produces a gauging solution for improved adhesion, workability and waterproofing of mortars and cementitious mixes. I know this is not the best route to go in waterproofing a wall normally. Suitable Application. View all: Bostik Cement Mix. com. Waterproof a leaking roof. Use on exterior house and building walls, on concrete and brick built surfaces. Product code: 252325. 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. Order online at Screwfix. Product code. Coverage per Litre: 6m²/Ltr. I'm not expecting a smooth 'craftsmans' finish as other areas of render have a rough finish but look perfectly acceptable once painted. waterproof render. Sika Bond SBR+ Waterproof Bonding Agent and Mortar Admixture - 25L (6) £99. With 10mm for the scratch coat and 8mm for the top coat. I've attached some images. Dried clear. Bostik Cementone General Purpose Mortar 5kg. Volume. Dow 791 Weatherproof Silicone Sealant Anthracite 310ml (44836) (42) compare. Scratch coat @ 4 to 1 & Top coat @ 5 to 1, I like to add fibre (adfil) to mix, gives a bit of reinforcing, prevents cracking,etc. It’s in such bad shape that you can push your finger quite easily into it and it comes away like wet sand. I know I need to attach mesh to the surface, but a friend has told. Adheres to damp masonry and is weather-resistant. Overcoat with any. that's why i am kind of believe the exterior wall is vulnerable to weather conditions. Ready to Use. Use stainless steel bellcast/render stop beads as req.