Scratch coat is 1 part cement, 1 hydrated lime, 5 plastering sand, with fibreglass mesh embedded. 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. VAT. com. If I render with febond sbr sand and cement render then I can use 10mm travertine tiles. It produces a superior. Masonry cream is snake oil, it does nothing. Add for Delivery. right quick little question, got to render gable end of a house. Creates smooth, easy to work with mortar. Screwfix customers rate this product 4. • Air entraining plasticiser • Prevents shrinking and cracking during curing • Water reducing • Chloride freeMortar plasticiser for stronger, easier to use brick and block-laying mortar. 5mm thick maybe more on old uneven walls it has a waterproof addative in the mix. £9. Quick-Dry Stabilising Solution. If in the top coat the waterproofer or water resistance(r) may/fail and then damp has every chance of getting through. Completed an extension last summer and the exterior walls were cement rendered the usual way with waterproofer etc. 99. 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. Order Fabsil Universal Protector Water-Repellent Spray 400ml at Screwfix. don't pva the wall either first coat with waterproofer in and second coat with waterproofer in also. 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. KA Tanking Slurry is the complete crystalline solution to waterproofing masonry and blockwork. 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. UK call centre ready for your call 24/7. com. Use plasticiser on both coats. Reduces water permeability. She got the guy back and he said 'oh well, it hasn't worked, you need the place tanking which. Screwfix customers rate this product 5/5. 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. 4-1 first coat and 5-1 second coat 3-1 is to strong it will be to brittle and might crack. 3. the rendering is the easy bit. 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). Screwfix - Rapid-setting waterproof cement. Can anyone give me advice on rendering over Medium Density Blocks for an external garage. Click & Collect. I will be using metal studs to make the framework and lining it in OSB3. Waterproofs Plaster, Plasterboard,. Overcoat 48-72 hours after application with any standard water-based masonry paint or mineral. Go all over it and knock off the loose stuff. Then sharp sand fine, lime, cement in 6: 1: 1 ratio as top coat. By getting the finish coat on within 8. £ 14. If you are in a bit of a wild area, then consider epoxy - two-pack - masonry paint. General purpose, solvent-based. 3-layer spun-bonded waterproof membrane with excellent tensile and tear strength. Delivery Out of stock for delivery. Rake out the brickwork joints (say 5mm) to give the render something to 'hang on' to. Add for Delivery. 4:1 with morticiser for scratch you can float next day with 5:1:1 sand, cement, lime + waterproofer in water butt. The Sandtex Brickwork Waterproofer & Protector provides a clear waterproof protective layer for bare brickwork. £3. I know this is not the best route to go in waterproofing a wall normally. 80. Been a plasterer /damproofer for 28 years and yes you can use SBR and Paint over it but will need to give a sand or LIGHT. Cementone Freeflo Plasticiser is a retarding waterproofer and plasticiser. Order online today. I have been quoted between £600-£800 to re render the shed (just got the one quote so far so I have no idea if I can get this done cheaper)Installation on brick walls. Discussion in 'Builders' Talk' started by Gary hunt, Oct 23, 2016. Cemenmt render will dmage the wall eventually - its not ok to do it. Big Jumbo, Jul 27, 2009. Contains primer, coating and waterproof jointing tape. 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. giving a lighter easier to work gauge of mortar. Need to paint render which was applied about 4 years ago apparently with waterproofing element included. Thermalite hedge their bets somewhat on their finishes section. Ideal for use on swimming pools, water tanks, ponds, below ground concrete, as well as for render and floor screeds for water resistant applications. rogerk101 Screwfix Select. Touch-Dry in 6 Hours, Fully Dry in 24 Hours. The wall has a cavity with no insulation and about 150mm above the damp course. (£5. Use stainless steel bellcast/render stop beads as req. Order No Nonsense Anti-Crack Acrylic White 310ml at Screwfix. Don't try and apply render in one coat it will only sag and probably fall off wall. Use a coat of 2:1 sand cement with waterproofer followed by a 3:1 and then a 4:1 (all with w. This would be better off in plastering forum. ★★★★★ ★★★★★. Mix it strong say 3:1:1 or 3:1 plus plasticiser. 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. Scratch coat is 1 part cement, 1 hydrated lime, 5 plastering sand, with fibreglass mesh embedded. The front apex has often shown signs of water ingress as the mortar lines underneath are often visible after heavy rain. com. 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. Delivery Next day available. The render on the outside should waterproof the wall anyway. Primer Not Required. 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. Was going to brush over the cut end with SBR slurry then render, just wondered on this small area can I just use 1 coat, 5 sharp sand / 1 cement with a splash. Provides superb weather protection for bricks, mortar and concrete. Delivery. Water vapour permeable. Render thickness seems to be between 5 and 10 mm. Pieces in Pack/Case. When diluted with water it produces a gauging solution for improved adhesion, workability and waterproofing of mortars and cementitious mixes. Only way to test if it's still wet is with a moisture meter. #2. I’m doing the patio and 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}. com. Damp walls can cause salt deposits to appear – these can blow your plaster. Buy Fixings & Fastenings at Screwfix. VAT. Mix approximately 4 to 5 litres of water per 25kg bag using an electrically driven mixer until you achieve a workable consistency. Everbuild’s Black Jack paint is perfect for. 6 January 2021 at 10:22PM. 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. Is vital that the waterproofer is added in the correct amounts according the the manufactures instructions. IKOpro Synthaprufe Trade is easy to apply and provides damp proofing for concrete floors, foundations and masonry walls below, at or above ground level. We are ready for your call 24/7. • Apply in temperatures from +5°C to +25°C. 5mm plasterboard to the wall, and then skim. FInish with horizontal scratches for a key. 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. £ 28. PAGE 1 OF 2. 'A' way to do it is this. Can be used for rendering, roughcast, pebble dashing, harling and above ground waterproofing. This time, its butting up against 12mm plasterboard (painted) which was dabbed directly to the brick (no render). I know I need to attach mesh to the surface, but a friend has told. Not available for delivery. 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. Will this be enough. 2nd coat (floating coat) 4:1 sharp sand with waterproofer as above etc. Seeking a bit of advice, been waiting for my plasterer to come and do my external rendering. Buy Aggregates & Chemicals at Screwfix. Coverage per Litre: 6m²/Ltr. Currently in Stock. Provides perfect adhesion without the use of a primer, even on damp substrates. ★★★★★ ★★★★★. View all: Mapei Shower Waterproofing Kits. 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. 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. i now have to patch it up, about a 2 inch strip. Tarmac Once Coat Render is a pre blended render, just add water to apply. 99 Inc Vat. Contains primer, coating and waterproof jointing tape. The wall is not tanked with any waterproof membrane. 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. 2 coats. ex. com. Discussion in ' Builders' Talk ' started by Fussy Spark, Dec 27, 2020 . 3) Use an additive in a render mix, like SBR to act as a total waterproofer for walls and ceiling, then lay the concrete floor as above. Soudal Repair Express Plaster Filler White 250ml (125RG) (4) compare. com. 95 Ex VAT. Try on a couple of places (bottom of wall more likely to have weak adhesion). Will not corrode steel reinforcement (brick ties etc. 1. The render goes right down to the ground outside. 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. 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. For Interior & Exterior Use. £13. £9. too much suction 4:1 will do you. Protect your outdoor surfaces from the weather by coating them with black bitumen paint from Everbuild. Screwfix Community Forum. Goddo New Member. com. It has many uses, and is suitable for most porous. Use a waterproofer additive. So it'll be damp from behind (penetrating damp) and damp from below (rising damp), so not much to be gained by. FREE next day delivery available, free collection in 1. 69. PayPal accepted online. 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. Overcoat with any. #2. Or it could look like an unfinished wall (which, of course, it is ) I think it looks good in these photos. A couple of potential problems come to mind; concrete on a stud wall will almost certainly crack and fracture over time - I think. Shapeable to Repair Without Formwork. I am after some advice if poss. 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. Delivery Next day available. Covers up to 4m². 5055492702975. Order online at Screwfix. Applied waterproof PVA. Login to save for later. Im an old skool plasterer ( 34 years old ) And when i am rendering i use sand,cement and waterproofer/feb. Sealing porous areas and extending coverage with paint sealer will ensure a longer lasting coat. Order Sandtex Quick-Dry Stabilising Solution 5Ltr at Screwfix. Suitable for 2. It incorporates a Polymer bonding aid allowing the results. Sets in 20 minutes. The proceedure is:-. I've heard bad things about Sika, re: not being suitable for moxing in a cement mixer: online at Screwfix. . Stores are open 7 days a week. you. 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. 250 cement board. Screwfix Community Forum. Ka Tanking Slurry Waterproofing Solution Grey 25kg. 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. 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. 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. Home Tags > rendering. very big difference. 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. Screwfix Community Forum. FREE next day delivery available, free collection in 1 minute. Hundreds of stores Nationwide. We stock Everbuild PVA, ideal for use as a contractors PVA due to its high strength. 5 Ltr. 8m)above newly-fitted french doors to render. Often soft in texture, when applied these substances harden. 1. 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 the wall is wet, not sure trapping the damp in the wall in under new. 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. Recycled Polypropylene Construction. This is your 'drip-tray' separating the above and below dpc areas. 1. I intend to apply sandtex stabilising solution and then sandtex fine texture paint which say's it has a breathable waterproofer in it. the. Login to save for later. (£1. As the title suggests is artex that you use to decorate ceilings waterproof?chillimonster Screwfix Select. 1. Not available for delivery. He ended up really busy so we decided i'd. That will last. You should have. A-. The shed is 5m x 2m high & has 2 end walls about a metre wide. He rendered approx two square mtres at a time before applying dash. No waterproofer in render scratch coat. Phil the Paver, Nov 22, 2014. the problem comes because one of the old walls has the damp course below of extension. Mould & Mildew-Resistant. The earth is retained in the garden with another wall. For Indoor Use. Suitable for brush application only. PVA sealer is an extremely versatile, odourless, waterproof and non-toxic adhesive that is suitable for a multitude of tasks and requirements. 8/5. White sand can be bought in15kg bags and gauged with snow cem white cement and hydrated lime for a perfectly white finish, but even so in time this will discolour and fade and will. 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. FREE next day delivery available,. For Interior & Exterior Use. Breathable masonry paint is essential for waterproofing your exterior bricks while allowing moisture to escape from inside your house. Crack & Frost-Resistant. 45/Kg) Once that dries, I can then apply 2 coats of render (scratch + 2nd coat). fillyboy Screwfix Select. Use a mixer and measure quatities using a bucket for consistency. It's all more controllable, and the 'plaster' ain't setting before your very eyes sending you into a blind panic. com. . You can do it. I have a small area (2. waterproofing paint. Forms a transparent, waterproof barrier. Covers up to 4m². For Interior & Exterior Use. Should be ok to overpaint SBR with masonry paint. Learn more about Graphic Design Architectural Rendering | Victoria, BC. Suitable for a Variety of Applications. com. If you bought the paint you can get a refund on it. Wait several hours until the coating of Primer G is completely dry. Choose this handy pre-mixed sand and cement render from Weber to cover brickwork, blockwork, concrete and other suitable surfaces. 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. Render - smooth finish. The moisture will force its way out eventually. Stormdry Masonry Protection Cream is a colorless waterproofing cream for application to brick, stone, mortar, render and masonry. It sets to a rock-hard finish and can be overcoated in 24 hours. Thistle One Coat Plaster 7. 49Inc Vat. 5 apply new finish. The pointing needs raking out 25mm deep, and re-pointing with a 4:1 sand & lime mix. com. Click & collect in stores nationwide. If you don`t want waterproofer at least use a plasticiser or lime. For Cement Based Mixes. 1:20 rather than the more dilute 1:40 option. Available in a variety of options. Does any one else have the nightmare of render falling off in patches once the. 99Inc Vat. I would get your render on soon so the block work can dry out. Currently in Stock. Tags:. After starting he informed me that. The wall has a cavity with no insulation and about 150mm above the damp course. Hi, My extension was built and rendered using a sand/cement render around 4 years ago. Thanks for the help Alastair. Suitable for ceramic, porcelain and non-moisture. you can hose down the scratch coat just before you. I have seen many threads about lime / no lime and whether you should waterproof on the scratch coat / finish coat etc etc. Water & Weather-Resistant. 2017 #2. Perhaps just get a small bag of sand & cement from a plumbers supplies and after gluing up the patch (Pva or SBR etc) then fill and level off with the mortar. FREE Click & Collect within 30 minutes. Hi, My extension was built and rendered using a sand/cement render around 4 years ago. I’m leaning more towards K rend, as it’s silicone and. £17. Buy online & collect in hundreds of stores in as little as 1 minute! 30 day money back guarantee. 1/5. ★★★★★ ★★★★★. Hi i've built some raised flower beds / planters out of dense concrete blocks. 30 day money back guarantee. UK call centre ready for your call 24/7. This not painted at the time as suspected water ingress problem however this issue now resolved. External wall is rendered. Silicone render and waterproofing for penetrating damp. £179. com. If you are going ot paint it, use a Stabiliser solution first to prime the render then apply two coats of a good masonary paint and you shouldn't have any problems. Nail straight pieces of timber vertically & horizontally as required to external corners, window & door reveals. I use to put waterproofer in both coats, but some peeps on do scratch coat. £ 28. View all: Thompsons Water Seal. 50/Kg)Product Details. #10. Click & Collect. Buy Cement Mix at Screwfix. Product Type. Evening guys. A. 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. For the coloured top finish you require you use coloured sand and not coloured cement. 14th edition, Oct 12, 2017 #1. Sika Waterproof Coating Grey 5kg (83502) (67) compare. 4m²/Ltr. 8/5. Discussion in 'Builders' Talk' started by questioner, Jul 6. 1-2hrs Approximate Setting Time. Hmmm, that could look impressive. I’m doing the patio and the intention is to fill the void. Low toxicity. Order online at Screwfix. 1 remove lose stuff. £ 21. Order Bostik SBR Admixture White 5Ltr at Screwfix. On dense, less absorbent brickwork or render, coverage of the brick waterproofer can be increased by up to 10m² per litre. today he's applying top coat with no waterproofer. Softwashing is the best way of cleaning your render. Depending on the ratio you used for waterproofer/water in your mix you should find that the render is virtually weatherproof. Key products in the Bostik waterproofing range include: Flexacryl - a flexible, single coat compound for immediate waterproofing over most conventional roofing substrates. Volume. Screwfix Community Forum. 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. PVA Sealers. Low Odour & Solvented. PVA sealer is an extremely versatile, odourless, waterproof and non-toxic adhesive that is suitable for a multitude of tasks and requirements. 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. 96 per L . Handyandy - really Mr. 5 kg. 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. Furthermore, the stabilising solution and PVA will both act to keep any moisture within the concrete, hence why you experiencing problems. Sika Proof Liquid Waterproofer 5L £7. Is there anything I can do now. setting manholes and repairing rendering and floor screeds.