![]() Pairing the right plaster and blueboard together matters to plasterers, so if you are thinking of installing your own blueboard and have a plaster finish it, make sure you consult them before buying materials. Each company’s product has slightly different properties when it comes to how they are applied and worked to a finish. There are several different types of plasters and several manufacturers of blue board. Preexisting surfaces that are structurally sound can be coated with a bonding agent and resurfaced with two coat plaster. There are also other substrates that plaster can be applied to such as steel mesh, or wood lath as seen with the old horsehair plaster, which may be required if your property is listed as a historical landmark building. You cannot use joint compound to finish blueboard. Blue board must be used with one coat plastering and is the preferred substrate for two coat plastering although sheetrock can also be used with two coat plaster but it does represent additional challenges to the plasterers. This suction action is an important property when it comes to troweling the plaster smooth and makes life much easier for plasterers when compared to plastering over other surfaces. Unlike sheetrock, the paper on blueboard is very porous which creates a suction on the wet plaster thus drawing the wet plaster into the pours for still greater bonding. The paper has also been treated with bonding agent, again to improve plaster bonding to the paper. When plaster is applied these microfibers become imbedded in the plaster for greater adhesion. Patches, and overlays can take several days because drying must occur between coats of Joint compound and before sanding.īlueboard is covered in a paper that is feltier or more fibrous. Overlays take slightly less time then two coat. ![]() Patches, and overlays depending on square footage can usually be finished the same day. Patches, and overlays depending on square footage can be usually be finished same day. Some plaster finishes can be mimicked but tend to look amatuerish compared to plaster. Primarily popcorn and knock down, which advertise the fact it is a lower quality sheetrock system. Lowest / well known to have joints and screw areas visible after painting depending on light Non-setting have lots of shrinkage as it dries and the bigger the fill the worse the shrinkage and resulting cracking. Varies Setting joint compounds have low shrinkage. Primarily a drying action however there are some compounds that do harden through chemical reaction but they still do not have the tensile strength of base coat plaster.īest Base coat is more like cement and when struck with a steel trowel it will generate sparks. Sheet rock, some painted surface but has a higher rate of separation from surface depending on paint and other variables.īest especially when resurfacing entire walls and ceilings, deep or irregular patches, curved surfaces Government building regulations frequently dictate when and where which type of drywall and how many layers of drywall must be used.īlue board, Sheetrock, Steel mesh lath along with most surfaces treated with bonding agent including paint brick, concrete, cinder block and wood lathe for historical landmarks designated homeīlue board, Most dry surfaces treated with bonding agent, however if large areas Kal-Kote highly recommended. This core is then wrapped in various types of paper depending on what it is used for. Other materials such as fiberglass fibers for strength, or water resistant compounds for green board can be added to the gypsum. Drywall consists of a core made mostly from a soft mineral called gypsum. The two standard sizes for drywall are 4 by 8 foot and 4 by 12 foot sheets, but they also come in other dimensions. The thickness of drywall ranges from one quarter inch all the way up to one inch for specialty uses such as in elevator shafts. There is even drywall specifically used for exterior ceilings. Other categories of drywall include fire code rated, high strength and light weight. The most common three types of drywall are sheetrock, blueboard and green board, also known as moisture resistant board. Technically the word drywall includes a wide range of products. The word drywall is commonly used mistakenly by the general public when talking about sheetrock, which is normally finished by using joint compound.
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