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Insulating your exterior plaster and lath walls is both possible and beneficial - not just for lower energy bills but also for added sound absorption and improved indoor air quality. This will help keep the insulation in place for years to come. Secure ItĪfter cutting to size, secure the insulation with pins or masonry tacks or plastic anchors that are inserted with a hammer drill into the mortar joints of your brick or stone wall. Make sure you leave gaps at the top and bottom of each sheet in order to prevent moisture build up. Using a measure and razor knife, cut the insulation to fit snugly inside the cavity. Both materials can be cut and installed easily in the wall’s cavity. The two most common types of insulation for lath walls are fiberglass and mineral wool. Here’s how you do it: Choose Your Insulation The answer is: Yes, absolutely! Insulating lath walls is a popular way to make an older home more energy efficient. When it comes to insulating a lath wall, you might be asking yourself, Is it possible? Can I get my exterior plaster and lath walls insulated? So when considering insulation for an exterior plaster wall, consider using lath wall insulation as an effective solution. Comfort – An even temperature throughout your home means more comfort for you and your family.You won’t hear as much of what goes on outside your home as before. Noise reduction – When you have insulated lath walls, sound-proofing your home becomes much easier.That means your wallet will thank you too! Energy savings – With insulation creating a buffer, you’ll waste less energy due to heating and cooling needs.Temperature regulation: – Insulation provides a barrier against outside temperatures, and helps keep your home cooler in summer and warmer in winter.There are some benefits to having insulated lath walls: This creates an airtight seal against the weather. You may have heard about lath walls, a construction technique that dates back to the Middle Ages, but did you know that these walls can be insulated? Yes! Lath walls are made from strips or sheets of wood or metal that are nailed to the frame, and then plaster is applied between the lath. If such cracks are found, seal them up with caulk or expandable foam insulation to keep your walls adequately insulated for maximum energy efficiency. Once done, these holes can be filled and sealed with stucco or other fillers.įinally, if you have an exterior plaster and lath wall that is already insulated, it’s important to make sure it stays that way by checking for cracks or openings in the walls where air could be getting through. This process requires drilling small holes in the exterior wall at regular intervals, which are then filled with cellulose insulation. This process requires removing the old lath and plaster, adding new batt insulation and then re-installing the lath and plaster over it.Īnother option is to blow cellulose insulation into the wall cavities. The most common way is to add insulation materials between the laths. If you’re looking to insulate exterior plaster and lath walls, you have a few options. To get both advantages-insulation and esthetic appeal-you may want to consider other materials, such as drywall with foam board insulation on top. Without insulation, exterior plaster and lath walls do little to protect your home from temperature fluctuations or sound pollution from outside sources. While it looks nice, this type of wall isn’t insulated and lets air pass through, causing your home to lose heat or air conditioning on especially hot or cold days. Next comes a layer of plaster, which is applied over the lath strips.įinally, the outside layer is covered in a textured material like stucco to protect it from the elements. The interior layer is usually made of wood lath, an array of narrow strips of wood that’s attached to the studs in a wall frame.
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Exterior walls constructed with plaster and lath are composed of multiple layers. If you’re looking to understand exterior walls, it helps to know the basics of plaster and lath walls.