Map cracking is similar to crazing except that it is usually deeper – sometimes going right through the plaster – and the hexagons of the pattern may measure are more than an 1/2 inch across. If necessary, glass fibre tissue can be applied during the painting operation. However, the good news is that craze cracks are of relatively little importance, they do not open and close with time, and can be covered using a reasonable quality paint. Crazing often occurs within a few hours of the plaster being applied to the wall and cracks may hardly be visible until dust or moisture makes them noticeable. They are usually the result of over-trowelling a rich mix – one with a high cement content – or using sand containing an excessive amount of dust: more than 15% by mass passing a 0.075 mm sieve. Craze cracks are usually very fine and shallow and do not extend through the whole depth of the plaster. Non-structural cracking is a network of fine cracks, usually in a hexagonal pattern, which typically measures between 7/32″ and 5/16″ across each hexagon. Here we discuss perhaps the most obvious defects in portland cement plastering: cracks – those that are non-structural and the more challenging and nasty type: structural cracks. How can a property owner be sure that the plaster provided by the building contractor is acceptable, and if not, what can be done about it? It’s not a simple question to answer. If the area you’ve worked on it larger than 2 inches, you may find it necessary to repaint the entire wall.įollowing these eight steps will restore a smooth, even finish to your walls.A Variety of Factors Can Cause Plaster Cracks #8 Use primer (if necessary) and paint matching your wall to finish the repair. #7 If the opposite is true and the spackling has depressed slightly after drying, apply additional spackling using your putty knife and let it dry, until the patch is even with the wall surface. If you used vinyl spackle for a larger hole or imperfection, you will need to sand the area. You might find this necessary if the spackled area is slightly raised from the wall, or if it is uneven. #6 Sand the area if necessary after the product dries. #4 Scrape away excess compound from the wall, using your putty knife at a 90 degree angle to the wall. Remember to close your container of putty as soon as you’ve removed what you need, as it dries quickly. Use the putty knife at a 45 degree angle and smooth putty over the area do this several times until the hole is filled. Instead focus on filling the specific hole with just the amount of putty necessary. Do not slather the compound over the damaged area. Be careful to only apply as much putty as you need to patch the area. #3 Apply a small amount of spackling using a putty or drywall knife. ![]() Wipe down the area again after removing any protrusions around the hole, to remove dust. You can use a putty knife to do this, or a fine-grit sandpaper will work well if there is not a lot of protruding material around the hole. Remove as much of this as possible to create the smoothest edge possible before patching. Often, a hole will have some areas around it which are fragmenting and protruding outward from the wall. It dries fast (30 minutes) and is undetectable under one coat of paint after being smoothed with a putty knife. Spackling plus Primer is useful if you have decided to repaint the entire wall. To apply, layer ¼ inch at a time and let the spackling dry (1-5 hours) before applying the next layer. Vinyl Spackling is best for slightly larger cracks and holes, up to ¾ inch deep. These are best for holes no deeper than ¼ inch and no greater than 1 inch across. Lightweight Spackling products are fast-drying with little to no shrinking and a smooth finish. Spackling compounds come either powdered, which you mix with water before using, or in a paste form, which is more convenient and commonly used: Plaster walls must be repaired with a plaster product. Use spackling compounds to patch small nail and screw holes, or small imperfections. Patching Compound: Spackling compounds are made from gypsum plaster and adhesive. Knives with a flexible edge are used to seal around drywall tape. To repair nail holes and other imperfections, use a knife with a sharp, hard edge. As a rule, the larger a space you are repairing, the larger a knife you will need. Choose Your Productsĭrywall / Putty Knife: Putty knives are adequate to repair small nail holes, where you will need a drywall knife to cover larger imperfections in the wall. You can repair nail holes, screw holes, cracks, dents, and larger holes using a spackling compound before you paint. ![]() It is one of the easiest home improvement projects you can do to greatly improve the appearance of your home. Covering nail holes before painting revitalizes and freshens a space.
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