More often than not they wrongly assume the mix was too weak, or too strong. Over four years ago I repaired about two metres of roof verge using a mix of 4 sharp sand to one of cement. I know you may be thinking does anyone really go to this much trouble over sand for goodness sake? When handling roof cement, wear gloves to keep it off your skin. Yes it’s not nice to work in, but the chances are that any substrate you are working with will be inherently damp. In this video I will take you through a few basic steps and quickly talk about different grades of sand. A sandy substrate can occur very often with brickwork or ridge tiles. 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….) All building sands are not created equal. I used this mix because as a complete roofing novice I happened on to this site:- Normal warm dry weather – Slightly overcast or weak sun, no showers, not too hot, and not freezing. 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. © 2020 Fixmyroof.co.uk - Privacy & Disclosures - Contact. Of course, you can’t use roofing cement for just anything, but on the other hand, it is a rather multi-purpose product. Sometimes work schedules or a long hot summer (occasionally they do happen) means that work has to press on regardless. 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. Plasticiser – Febmix , there’s a good reason it’s referred to as the original… its been around ages and it works. The most common being a plasticiser like ‘febmix’, this works by creating millions of tiny bubbles in the mix, this process is called ‘entraining’. Obviously we don’t bond mortar to plastic as a general rule in the building trade, but a situation where a bad substrate may arise could be the following…. 834 roof tile cement mix products below Roof Tile Metal Building Materials Prices … A: The cement mix is not for re pointing, rather you use the ROOFBOND Flexible Pointing to do the re pointing, as it is flexible which resists cracking and bonds very well to the tiles, so you are not going to have to re point it as often as cement pointing. Cold weather – Late autumn and winter in the UK. Often a mix made with sharp sand is used for other building jobs such as screeding floors, but it can be unusable and too harsh for any sort of detail work, like the pointing or relaying of ridge tiles. A quick word of caution, using an additive isn’t a guarantee of an magically improved mix or an excuse to be negligent with the basics. If you’re using this in any capacity it normally means you are a professional, by that I mean that time is money and you can’t wait, or it’s an emergency. Ridge tiles – Here are two separate properties with the same roof tiles, and roughly the same year. Cement ratios – If you look closely you will see that the same sand cement ratio has probably been used for the chimney that was used for the rest of the house, which is only 9 years old. Personally I don’t do that, but you have to respect that kind of dedication. It should have the consistency of heavy cream. What happens is that not only has the brick or tile become very dry making it absorb water like a sponge, but the hot sun and ambient heat evaporates the water away from it and into the air, leaving it thirsty for more water, and so on. I can guarantee without any real experience or knowledge anyone can mix cement mortar that on first sight will look the business. Spot mix – A simple mix on a plastic re-usable mixing spot. As a rule of thumb anything below 5 degrees centigrade and you are asking for trouble with mortar or concrete. A ‘key’ – Here you can see the depth that the cement mortar has receded, if you can poke your fingers in 5 – 10mm + often that would be considered a large enough gap to accept fresh mortar and provide ‘a good key’ without additional measures, such as grinding out the old mortar with a chasing tool. Other important factors for good quality mortar are listed below…. Working in the rain with a mortar mix will not only be miserable but is totally impractical, especially on a roof. The conditions are now good for working with sand and cement mortar mixes. Watching the weather forecast on the television the evening before doing any cement or mortar work will pay dividends here. Developed in conjunction with roofing professionals for a reliable and durable product that supports roof applicators' product quality guarantees. Check out our range of Roof Tile Pointing products at your local Bunnings Warehouse. Modern roof cement will NOT contain asbestos. If you can afford to wait for perfect, or near perfect weather conditions it’s a good idea to try. Search Products. Bucket Mix – Everyone should know how to do one of these, it’s simple, cheap and useful. Fine building sand – A highly processed fine sand like those often found in large DIY chains can be just the job for brickwork pointing, brickwork repairs, or thinly re-bedding ridge tiles onto slate as an example. Sometimes if the original mortar mix has been cement weak, compromised by poor additives or other factors, it may not only be weak, but start to crumble and return back to a sand like state. Common building sand, often referred to as a ‘soft building sand’ may make the mortar nice to use for trowel work, and it can often feel a bit like mud, so it sticks to a trowel great. HENRY HE208R042 Gal Patch Roof Cement. Gorilla Waterproof Patch & Seal Tape 4" x 10' Black, (Pack of 1) 4.4 out of 5 stars 7,370. Combining these things doesn’t guarantee success with hard glazed surfaces, but it sure improves your chances. Sharp sand, or washed sand as it is often known fits the bill here. On the old roof the verge mortar had clearly been repaired many times due to cracking and falling out. Typically they may have done small repair works around the home like pointing gaps in crazy paving, only to find it has cracked or crumbled on them at a later stage. If you were to consider an old fashioned lock and key, now you imagine the key entering the lock and turning 90º left or right into a position where if you tried to pull the key out it would be stuck, if you can achieve that basic principle with a nice strong mortar it will be very hard to remove, even if the adhesive bond isn’t as good as it should be. Mortar should not be stronger than the material that you are working with as a rule of thumb. If you were to rule out all mortar related jobs on all showery days, most professional roofers would have a huge backlog of work, and angry customers. A dry surface like bricks or concrete tiles will draw moisture from your mortar (sucking off), and this in normal conditions may be bearable. If the mix is too strong as for instance with a 2 : 1 mix, not only may it dry too fast especially in sunny conditions, but any natural movement of the roof as seen with expansion and contraction won’t be catered for. Always a problem – A good mortar mix with fine and coarse particles, cement additive for increased bond, a nice key and a cool day. Are there any special values on roof cement & patches? These of course are my personal tips learnt over the years, or gleamed from others in the trade, both success and failure have shaped this article. In this article I’m going to tell you how to mix a simple cement based mortar with standard off the shelf building sands, make it strong, resistant to cracking, and get it to stick. This is a beginners guide to pointing up. Plastic roofing cement is designed to avoid cracking in cold weather and to resist melting in high temperatures, but like most roofing materials, it can deteriorate and its … the brickwork or roof tiles. This ratio of sand to cement is ideal for exposed areas such as the roof, without being stronger than the bricks or ridge tiles you are working with. Sands can also be mixed together on occasion to get the best of both worlds. The good news is it is still as solid as a rock. This means a mix made with a standard building sand with small fine particles in a large dollop, will want to shrink and crack as it cures. The exact same thing in an old wall handling roof cement already applied to allow more working time to 10! Fits the bill here – I know this is never good for sand cement. You through a few basic steps and quickly talk about different grades sand... That was starting to crumble and not freezing roofer, builder, plasterer or renderer may their... 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