If you see it necessary you may need to roughen the brickwork up a bit to give the bricks more of a key for the plaster to grip to, but only you can make this decision. If you are going over bare brickwork, then dampen down the bricks to kill some of the suction and make sure that you rake out the mortar joints by about 10 to 12mm to give the heat resistant render something to really bite into. A rule of thumb is 200ml of water to every kilo of material.ġkg Of Heat Plaster needs 200mls of waterġ0kg Of Heat Plaster needs 2 liters of waterĢ0kg Of Heat Plaster needs 4 liters of water Mix the Vitcas Fireplace Render with cold water, I know it sounds obvious but you would be surprised, and this guide should give you an idea of how much water you will need to add to get it to the right consistency. The ones I have done in the past I would take off the existing plaster and reset my float beads then apply the Vitcas Heat Resistant render and then blend sand and cement into the Vitcas render. Once again use your common sense and if in doubt you can do the whole fireplace to be sure but you will be throwing money away unnecessarily. This tends to be inside the fireplace and around the front up to about 300mm. You don’t have to use Vitcas on the whole chimney breast unless the heat will exceed around 50☌, Just use it on the sections of the fireplace that are going to get hot. The Vitcas Fireplace Render is going to be in most cases used as a scratch coat for the finishing heat plaster unless the temperature is going to exceed 650☌ then you will have to make do with just the render finish. The other Vitcas Heat plaster is the finishing plaster that is only resistant up to 650☌ We are going to be talking about two of the products that Vitcas supply, the first one is Vitcas Fireplace Render, and this is the one to use where it is going to get really hot, and I mean up to the temperature of 1400☌. I am going to go quickly over the process that Vitcas suggest and hopefully will be able to shed some light on what to do. If a job is worth doing it is worth doing right, and that is why using Vitcas Heat resistant plaster is the way to go. I have seen it used hundreds of times by builders especially, who think it will be fine, but the reality is it is not the right product. Fireline plasterboard is designed to slow down the spread of fire, and it is not heat resistant. One myth that always makes me laugh is that plasterers and the public think that fireline plasterboard is ok to use in a fireplace where a log burning stove is to go. The biggest manufacturer of heat resistant plaster Vitcas has come on board the plasterers forum and plasterers news to help us educate the plastering world about heat resistant plasters and how they should be used. One of the biggest questions that come up on the plasterers forum and also via email over the last few years has been about using heat resistant plaster and more specifically plastering around a wood burning stove.
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