![]() ![]() ![]() Gypsum plaster is similar to plaster of Paris but contains a different type of gypsum that doesn’t shrink as much when it dries. However, it shrinks as it dries and cracks may occur in the plaster due to this shrinkage, especially if there is a difference in temperature between the inside and outside of the building. It dries quickly and is reasonably strong when dry. It is easy to apply and can be tinted if desired. Plaster of Paris is the most commonly used material. ![]() There are several materials used in plastering. It is often confused with plastered walls, but the difference between the two techniques is that skim coating only involves applying a thin layer to the top. Skim coating is a process that involves applying a thin layer of plaster to the surface of a wall or ceiling. Skim coating plaster is a simple and inexpensive solution to create a smooth, professional finish. Shall not be under any legal liability of any kind in respect of orĪrising out of the content of this guide.Skim coat plastering walls and ceilings to give a smooth finish. Guarantee the suitability of any recommendations made in this manual and The use of any of the materials or methods recommended in this manual orįor any consequences arising out of their use. Copyright © Paul Harper DIY Plastering 2015 No part of this online plastering guide may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise without the prior permission of the author. Then once you are a bit more familiar with plastering the fixing of angle beads will be a lot easier.Īll rights reserved. If you have a wall with no external corner plaster this first – angle beads are explained later. If you have an external corner on your wall then your first job is to fix an angle bead on the corner – this will give you a straight edge to work to whilst also setting the thickness for the whole. Sometimes the thickness will be set for you – if you have a door lining in the wall, then the backing coat should finish flush with this lining. The thickness of backing coat will depend upon the wall you are working on. If the wall you’re plastering is flat and has no cables that need to be buried you may be able to apply a coat of 10mm or less. Therefore a skim coat should be sufficient.Īverage thickness of a backing coat is 10 to 12 mm thick. Previously Plastered Surfaces - for example – when the wallpaper has been removed in old houses the wall behind although flat may be in too poor a condition to apply paint. If for some reason the plasterboard is not flat then a backing coat of ‘Bonding Coat’ can be applied. Plasterboard walls - the plasterboard acts as the backing coat as it is totally flat. It is not designed to flatten, but is literally just a smoothing off coat. The skim coat is applied to the backing coat at a thickness of 2-3 mm. The skim (finish) coat is responsible for smoothness.Ī smooth finish is obtained by applying a skim coat of finish plaster. The purpose of the backing coat is to achieve a totally flat surface – it doesn’t matter how rough it is as long as it is flat. The backing coat is responsible for flatness. If right to left is stated then a left handed person will find it easier to reverse this to left to right). If you are left handed simply reverse them. The directions of application in this manual apply to people that are right handed. If after having a go something does not make sense or you just can’t seem to get the results you want then use the Help Section. The best approach is to have a go – this is sometimes the only way some aspects of this guide will make sense (see practice page). The first wall you plaster may take all day – but taking the time to ensure your technique is correct will mean your speed rapidly increases. This does not mean you will become a plasterer overnight but you should be able to plaster a wall to a professional standard. The method has been proven during training courses to be the most successful format for complete beginners to achieve a professional finish. This plastering guide will take you through each stage of plastering.
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