Make sure that your sand is suitable for the task in hand, keep your mortar fresh and in good condition, and don’t allow your substrate to be too dry if possible. With large thick mortar, standard fine building sand does not always have the varied particle size and shape to give it enough strength, and will benefit from being a sharper building sand or having sharp sand added if this is the case. In the large picture you can clearly see there was no ‘key’ for any pointing to grip onto. The mix we used for the first layer was a 1:1 of water and acrylic, and then mix in your portland cement. Sometimes I get asked by home owners why my mortar doesn’t crack or crumble, and how it stays stuck. If you are doing any sort of pointing up, ridge tile bedding, or any sort of mortar work it can dry out too fast and be damaged, crack, or crack away from what you’re trying to bond the mortar to. Search Products. Here are two videos of how to mix a cement mortar. Safety Data Sheet This new roof is 2 months old, and you can see shrinkage cracks on the joints. Best sand for mortar – Three different commonly available sands, each will make a mortar with differing properties. An example of this would be for instance if we were doing a small bucket mix with a brick layers trowel… 1 third trowel of quick drying, 2 thirds standard OPC and three full trowels of sand, which still gives a ratio of 3 to 1, but depending on the weather a drying and working time of 20 mins +. In the case of pointing ridge tiles not only will the fresh mortar not bond to the sandy face properly, but often the sand will get between the roof surface and mortar making that bond to the surface of the roof ineffective. Great for brickwork, chimneys or roof details like flashings. The mix wants to be pretty liquid for this first coat, so that it penetrates (but doesn’t fall through) the fabric. Spot mix – A simple mix on a plastic re-usable mixing spot. As we are using rock sand it will take more time to cure cement as concrete. The cement concrete is a mixture of cement fine aggregate, coarse aggregate and water. Roofs and chimneys are exposed to the elements, so a stronger mix is required to stop wear like this. Plasticises, improves bond and frost proofs all in one. Because your roof must endure extreme weather conditions, coatings applied to it will wear over time. This is the thickest part of the mortar where fine ‘soft builders sand’ couldn’t cope. PILOT® – Plastic Roofing Cement is an asphalt based pliable plastic roofing cement used on damp as well as dry surfaces. I cannot say for sure that it weakens the mix prematurely, and would probably be sued if I did. Let’s take a look at some important factors that will directly affect the quality, bond, and longevity of your mortar or roofing mortar. © 2020 Fixmyroof.co.uk - Privacy & Disclosures - Contact. Another roofer, builder, plasterer or renderer may have their own opinions, or other great nuggets to share particular to their trade. Playing with the amount of quick drying and standard cement will accelerate or delay the drying process. Instant roof repair is another alternative to roofing cement that has been developed for a specific function – to repair leaks and cracks in roofs, concrete and more. This denser topping layer distributes floor loadings and prevents surface damage and abrasion. Often though, mortar has to be used on a roof in a larger mass, this could be large gaps in brickwork for pointing, deep wide chases, or re-laying ridge tiles onto a thick bed of mortar or onto small profiled roof tiles. I used this mix because as a complete roofing novice I happened on to this site:- Shop QUIKRETE 80-lb Gray Type-M Mortar Mix in the Mortar Mix department at Lowe's.com. Water is also added to the mix to activate the cement and make the whole mixture harden; Concrete: Although concrete uses similar base materials to mortar (cement, sand etc….) Developed in conjunction with roofing professionals for a reliable and durable product that supports roof applicators' product quality guarantees. Mixing a small sand and cement bucket mix like this by hand is not only fast, but very cheap for small DIY jobs around the house. Glazed substrates are what they sound like, if the surface is glazed or fired smooth any minute roughness in the surface is normally lost. Plastic roof cement is ideal for many roof repairs and for stopping roof leaks around vent pipes, spouts, valleys, skylights, gutters and chimneys. For most applications, the topping mix should consist of 65mm (2 ½ inches) of 1:4 sharp sand/cement by volume screed laid over the set vermiculite concrete. The good news is it is still as solid as a rock. So big mixes are out when working with this. Sands can also be mixed together on occasion to get the best of both worlds. The main benefits are that the mortar becomes more workable with a trowel and flows better allowing it to squeeze into finer details whilst using less water. It’s not cheap but is highly rated by the trade. No cement no matter how strong will stick to this substrate. As a rule of thumb anything below 5 degrees centigrade and you are asking for trouble with mortar or concrete. Wetting the bricks or tiles you are working with repeatedly with a hand held water sprayer can be an option on certain jobs, but on very hot days the surface temperatures can be too great for this to be effective. It works well when used before laying ceramic tiles, carpet, lino and more. Mortar should not be stronger than the material that you are working with as a rule of thumb. If this isn’t the case, often after the subsequent pointing of the ridges without a good key or quality sand cement mix, the result will be it falling out and down the roof very prematurely. Rain and showers – There’s a lot of this type of weather in the UK. Not only does this give you greater control, but is cheaper too. This is a beginners guide to pointing up. In these circumstances you may need to make sure you have plenty of depth in the chase to make any pointing repair effective, and larger chases may benefit from a sharper type building sand also. When a ridge or hip tile is bedded onto the roof, the thickness of the mortar bed determines how high the ridge tile will sit above the roof tiles, the bigger the distance is between the ridge and the roof, the more mortar mass it will take to fill the gap. The thickness of your mortar increases so will the chances of cracking with building... Areas put jute bags, durability and flexibility consider an S.B.R additive Styrene... 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