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. EVeryone seems to have their own opinion and hardly. Most external decorative renders are painted, most have a combined waterproofer and plasticiser addidive in last coat. £11. 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. £8. Ive been told 3:1 (2 parts sharp, 1 part builders sand) and not as wet as mortar for bricklaying. the case is, it is a kitchen area, i have plastered 4 walls, 3 dried completely. Go all over it and knock off the loose stuff. 2017 #2. If the wall is dry (unlikely this year!) lightly damp it without soaking it completely before applying the. You can do it. thanks, I keep reading that you shouldn't use cement render when a wall is built with lime or cob but because it will not breath but it has already been hard rendered on the outside so therefore it is already been. Page 1 of 2 1 2 Next > Thread Replastering around doorframe with very uneven brick walls. apply the sand and cement to above 1/4 inch of the existing. K Rend). May produce an allergic reaction. What depth should the battons for the scratch coat be? I was looking at 10-15 mm deep off the wall. 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. Product code: 139057. Ricky Johnson New Member. 99Inc Vat. 99 Inc Vat. , Apr 8, 2005 #2. The original poster asked if there was any reason he should not add lime to a mix with a waterproofing plasticiser additive and not as you are labouring under the impression of, a waterproofer anda plasticiser, nor any. horses for courses, take your pick!! good luck. 99. The old injection attempt has not worked, and neither has the inside attempt to render to 1m ht. • Drying time of around three to four hours. Then enjoy! I’ve done an extension and due to the nature of the land, now the door of the extension will be about 50cm above the grass of the garden. Water & Weather-Resistant. For Interior & Exterior Use. Hundreds of stores Nationwide. This coat should be applied while the first coat is still. 99Inc Vat. 90 Ex VAT. Can be applied onto a damp. Asked at the garden centre, what to do to stop it soaking in. I am after some advice if poss. Product Type. Not available for delivery. 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. shazauk New Member. Less water in your mix, by making sure the plas does its intended job gives a lighter easier to spread render and will also float much earlier and will also rule off with ease which means it will hardly even need a float. com. Glazing and frame sealants come in a variety of acrylic and silicone based sealants, used to keep your home free from water ingress. Render using Lime mortar. com. Click & Collect. FREE next day delivery available, free collection in 1 minute. I have been trying to use sand and cement with waterproofer (everlast) to level it out but unsure if I'm doing it right. waterproof render. Ideal for Use in Basements/Cellars but may also be Used as an External Coating for Concrete, Brick, Block & Bonded Renders. Waterproof render (sika 1) on the walls and d&d insulated plasterboard. Adhesive can be manufactured from a range of substances, with each having different properties. Suitable for a Variety of Applications. I know I need to attach mesh to the surface, but a friend has told. 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 (insisted upon by the local councils conservation officer. Just. For Indoor Use. 50/Kg)Product Details. 7 litres of SBR per 25kg bag of cement to give a totally waterproof render. Hi i've built some raised flower beds / planters out of dense concrete blocks. Choose from rapid or fast set cement for small commercial or domestic jobs. 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. Delivery 7 days a week 60 days free credit available. 14th edition, Oct 12, 2017 #1. The rest of the building had bell beading so it was only about a 4 metre section I had to do. Thanks for the help Alastair. Ideal for Use in Basements/Cellars but may also be Used as an External Coating for Concrete, Brick, Block & Bonded Renders. Im nervous about it cracking so please can you confirm the correct mix to use. This is especially important if you apply a thick traditional multi-coat plaster. 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. oh! and ladies. Dow 791 Weatherproof Silicone Sealant Anthracite 310ml (44836) (42) compare. Applying the board directly onto the membrane with thin adhesive and mushroom fixings. You might wonder why you need two (or more) coats. Not available for delivery. Tarmac One Coat Render is a pre blended render that can be applied in one coat for patch repairs or larger rendering projects. That's not to say lets seal the moisture in the bricks. Delivery Next day available. 4-1 first coat and 5-1 second coat 3-1 is to strong it will be to brittle and might crack. 1. 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. Single application waterproofing compound for emergency repair and general maintenance of most roof types. B) To seal around the bathtub - I am planning on using the Schluter Kerdi TS Bath and Shower Sealing Kit. Water Seal. 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. Hydrated Lime seems to be disappearing, I know several places around here no longer stock it. Screwfix Community Forum. Click & Collect. Nail straight pieces of timber vertically & horizontally as required to external corners, window & door reveals. £179. Weber One Coat Base Render 25kg £18. Live in an old stone cottage,just chopped a load of original lime/horsehair plaster off some of the kitchen walls,rendered it couple off weeks ago with 1st coat 3 sharp 1 soft 1 cement and redermix aditive,put the soft in as did a 3. 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. Light Grey. Evening guys. It has many uses, and is suitable for most porous. Buy Cement Mix at Screwfix. Forms a transparent, waterproof barrier. Most external decorative renders are painted, most have a combined waterproofer and plasticiser addidive in last coat. Coverage per Litre: 6m²/Ltr. It is only about 2 months old is it possible I can have a a company in to lay k-rend straight onto the render?The plas will work its way into the mix and soften down the mix as it turns. I would appreciate a little advice on the making of the waterproof render,thanks. For extra certainty use a render bonding agent such as Sika Rendagrip as a priming coat. Designed to be used for plasterboard internal corners. 99 Inc Vat Click & Collect Not available for delivery Buy Bonding Agents at Screwfix. 45/Kg) Once that dries, I can then apply 2 coats of render (scratch + 2nd coat). The wall is hollow concrete block, backfilled with concrete and reinforced to some rather substantial footings. KA Tanking Slurry is the complete crystalline solution to waterproofing masonry and blockwork. Use a waterproofer additive. unless you do a lot of good drainage behind it and seal it with something more waterproof than render. The earth is retained in the garden with another wall. Thompson's Water Seal uses a unique micro silicone emulsion to stop water penetration. Covers approx. You could have asked the plasterer to add a waterproofer to the render mix, but it's obviously too late now. Protecting from rain, frost, ice and snow, this product is ideal for providing extra protection to your home's exterior. PVA is a water-insoluble resin which is typically white at the point of application, but dries colourless and has a high bonding strength. 5 Ltr. Float at 5:1:1 Builders sand : OPC : LIME with waterproofer in the water How does that sound? 2. Is either expanding foam, or white silicone OK in this situation (inside of course, render with waterproof mix on the. 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. It's like comparing a totally waterproof jacket costing £500 with a 'showerproof' jacket costing £25. Click & Collect. The proceedure is:-. I intend on having the front of the wall rendered so it is important that it is sealed correctly. Step 6 – Apply First Coat of Render to Wall. Mould & Mildew-Resistant. Wait a few minutes, feel the pva. 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. Most if not all are painted with mansonry paint, (Specialist applications excepted, eg. We are ready for your call 24/7. External wall is rendered. Reduces water penetration without acting as a vapour barrier. If you arent going to paint over it then put the water proofing agent in the top coat. Render mix. today he's applying top coat with no waterproofer. Screwfix Community Forum. Anyone able offer advice on what type of paper i need as I can only find something called tyvek and the images seem to be using it. So I. General purpose, solvent-based. Inc. Can be used for rendering, roughcast, pebble dashing, harling and above ground waterproofing. com. I'm quite a confident diy'er and wanting to try rendering a garden wall for the first time. Delivery. For Interior & Exterior Use. Hmmm, that could look impressive. Need to render an external wall or building? The Everbuild 507 Rendagrip bonding agent will help ensure your render sticks firmly to the desired surface. I know this is not the best route to go in waterproofing a wall normally. Features include multi-pockets, adjustable designs and reflective tape so that you can be seen. 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. Cement based coating for preventing water and damp penetration in walls and floors. fillyboy Screwfix Select. 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. DIY_Has123, Feb 3, 2021. 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. The old one is of crumbling brick and an (equally crumbling) smooth cement render. 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. Buy Fixings & Fastenings at Screwfix. Screwfix Community Forum. Corrosion-Resistant. ALlow to dry for 4 or 5 days and then finish with a render of 6:1:1 rendering sand:cement:lime. Heat-Resistant. Is there anything I can do now. FREE next day delivery available, free collection in 1 minute. Screwfix - Rapid-setting waterproof cement. There are many external finishes - Finedown (smooth as in photos), Tyrolean, Pebble dash etc. com. OK. Wet room Kits consists of a mix of products which are needed when creating an open plan showering area. PAGE 1 OF 2. £17. This time, its butting up against 12mm plasterboard (painted) which was dabbed directly to the brick (no render). Delivery Next day available. For Interior & Exterior Use. Frame sealant is flexible and designed to withstand UV, weather and water exposure. 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. Product Type. Render up to (or very slightly below) the damp course, finishing with a 25° slope down and outwards from the dpc. Masonry cream is snake oil, it does nothing. 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. 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. 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. Because it's durable, weather-resistant and breathable, Weber one coat render is particularly useful for outside areas that are exposed to the weather, like garages, conservatories or garden walls. Buy Plastering items from Screwfix. The old injection attempt has not worked, and neither has the inside attempt to render to 1m ht. Ricky Johnson New Member. It incorporates a Polymer bonding aid allowing the results. £21. The wall has a cavity with no insulation and about 150mm above the damp course. Sets in 20 minutes. the waterproofer will not work!!!!!the top coat must be at least 6 parts WASHED sharp sand 1 part lime 1 part cement {opc}. High Bond Strength. blertsville, Jul 4, 2011. com. The rendering is falling off because it is dead and no longer adheres to the surface of the wall. Waterproofing Block Building. Ideal for emergency repairs, filling and patching. 49. You can use this all-in-one primer and sealer to form a waterproof layer on outdoor surfaces such as concrete, lightweight. qwas123 Screwfix Select. • High performance waterproofer. 5 Ltr. This Everbuild 402 Water Seal is a sealant that stops water wear on brickwork, stone masonry, concrete, pebbledash and other exterior walls. giving a lighter easier to work gauge of mortar. Volume. Delivery Next day available. Hi Guys. A couple of potential problems come to mind; concrete on a stud wall will almost certainly crack and fracture over time - I think. Fixing sheets with tile adhesive, step 1. Colour coded for easy identification. 3) waterproof paint the bottom exposed brick. 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. Order online at Screwfix. 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. 99 Inc Vat. waterproof render. £ 14. View all:. com. com. 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. you will then have a render. I’ve done an extension and due to the nature of the land, now the door of the extension will be about 50cm above the grass of the garden. Order online at Screwfix. Discussion in 'Builders' Talk' started by questioner, Jul 6, 2007. com. I intend on having the front of the wall rendered so it is important that it is sealed correctly. £9. Pieces in Pack/Case. 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). and the level of the intended patio is a brick above the existing damp course in that specific wall. This process is best carried out using a pumping system and water fed pole with a brush attachment. 99 Inc Vat. £49. 5 kg. Creates smooth, easy to work with mortar. Use on brick, concrete and stone. I wouldn't re-render - leave the bricks open to the air. Volume. com. 99. 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. First of all you need to get the mix right first coat needs to be 4-1-1, 4 sand 1 cement and 1 lime and 1 cup of waterproofer. Find your nearest Screwfix store and up to date opening times. 99. weakening its bond with the brickwork/render. Fischer FIS V Zero 300T Injection Mortar 300ml (498HL) compare. 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. Handyandy, Oct 23, 2005. FREE Click & Collect within 30 minutes. For easy application Tarmac One Coat Renders contain polymers. 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. Additional information. He advised waterproof PVA. Ask a question. Thanks. 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. 48. Light grey colour when dry. Applied waterproof PVA. 99Inc Vat. 40 per KG. I don't trust my builder and although he assured me he put waterproof additives within the render I do not believe him. 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. 99Inc Vat. Once dry then add a cup full per mix of neat sealer in the water. From what I’ve read on this very helpful forum, it’s a water/salt problem. The formula is solvent-free, making it more environmentally friendly by reducing pollution. Screwfix customers rate this product 4. Add for Delivery. Order Sandtex Quick-Dry Stabilising Solution 5Ltr at Screwfix. Charlie Far!ey New Member. 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. 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. Corrosion-Resistant. 12-16m²/Ltr. If the wall is wet, not sure trapping the damp in the wall in under new. Time is of the essence as access is via scaffold in my neighbor's yard and they want it gone. Order online today. 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. My sister had her coal cellar done last year, and the guy used Sika 1, then rendered and plastered over it. Hi handy 007 1/2. Sandtex Ultra Smooth Masonry Paint Pure Brilliant White 10Ltr (23771) (573) compare. Low Odour & Solvented. remove all dust. 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. 4 use mechanical fixings to fix this system to the wall. #2. Delivery. 5/5. Hello. Waterproof. Protect your outdoor surfaces from the weather by coating them with black bitumen paint from Everbuild. Contact the team today by calling 0161 509 9009 or emailing info@emperorpaint. Hang on, it's going white again. With regards the tile adhesive Devils advocate is sound advice. 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. Order online at Screwfix. UK call centre ready for your call 24/7. Buy. 5/5. Do what the gardener should have done. Add 1 cup of a waterproofing render mix per bucket full of water you mix. Should be ok to overpaint SBR with masonry paint. Hi, I wonder if anyone can help/ offer some advice as we’re at our wits end. At present it’s a thin coat of sand and cement mix with metal beading that’s rusty, on top of Accrington brick. today he's applying top coat with no waterproofer. Click & Collect. 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. Victor Lek Member. Neosparks, May 30, 2006. 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. ** 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. You can use any Render bonding or gripping to prep & fix all render patches - use Polyurethane sealant for filling the recently opened cracks. Sharp sand coarse and fine, lime and cement in 2 : 2: 1 :1 ratio for bottom coat ( scratch ) coat, with waterproofer. 25 Year Waterproofing from a Single Coat . Screwfix Community Forum. 1st coat scratch 1:1:4 (OPC:lime:sand), 2nd coat 1:1:5. OR 5:1 Good gritty sand, (or as above) cement and a bit of plastisizer in first coat (again scratched) then Rendamix in. Bricks are non porous, that's why houses are made of them. The process involves using a detergent to chemically clean the render using next to no pressure at all. £3. I would get your render on soon so the block work can dry out. £2. Discussion in 'Builders' Talk' started by questioner, Jul 6. Home Forums > Screwfix Community Forum > Builders' Talk > Render Waterproofer. Domestic & commercial use. Covers up to 4m². Order online at Screwfix. Inc. 3N dense concrete blocks. Recycled Polypropylene Construction. The front apex has often shown signs of water ingress as the mortar lines underneath are often visible after heavy rain. waterproofing paint. . External wall is rendered. Crack & Frost-Resistant. 3-layer spun-bonded waterproof membrane with excellent tensile and tear strength. Screwfix Community Forum. co. Suitable for brush application only. £ 52. Over 40,000 products. Buy 3 for £11 - View Offer. dj. dougalhouse Member. more damp comes through i would like to waterproof the render. £8. Available in a variety of options. 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. Give them a good scrub or pressure wash and tidy up the pointing. Home Forums > Screwfix Community Forum > Painters' Talk > Painting render. Screwfix - Rapid-setting waterproof cement. 8. 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). Weberend One-Coat Base Render (OCR) is a versatile pre-blended single coat application render, ideal for rendering brickwork, blockwork and concrete. giving a lighter easier to work gauge of mortar. Waterproofs Plaster, Plasterboard, Plywood, Render & Concrete. 5°C. com. It's all more controllable, and the 'plaster' ain't setting before your very eyes sending you into a blind panic. Thermalite hedge their bets somewhat on their finishes section. These products enable a way to effectively aid in water removal as well as keeping other area’s watertight. If you are in a bit of a wild area, then consider epoxy - two-pack - masonry paint. Waterproofs Plaster, Plasterboard, Plywood, Render & Concrete. Order online at Screwfix. If in the top coat the waterproofer or water resistance(r) may/fail and then damp has every chance of getting through. The correct method is as follows:- 1st coat (scratch coat) 3:1 sharp sand with waterproofer and scratched. But I'll have a go. Mr. Product Type. 1. final coat of render needs to. Click & Collect in as little as 1 minute. Apply with Brush or Roller. 6/5. View all: Bostik Cement Mix. 2. My idea is to remove the lose render from around the window (as I have started to do already) + remove any old foam. The pointing needs raking out 25mm deep, and re-pointing with a 4:1 sand & lime mix. Will this be enough.