The most energy-efficient option is the only way to go, even if it is the most expensive. Research is the key to success, and you need to do your homework.ĭon’t skimp on price. Heat pump versus oil? Add natural gas to this question. Look for a link to the “Delaware Project.” Obviously, it’s difficult seeing behind the walls when this is done, but qualified and experienced insulation contractors are very good at it.Īt the website I found a great video series that demonstrates the technique. This has to be done very carefully, so the insulation is evenly distributed and doesn’t settle in one place. The method I’ve seen most often is blowing cellulose insulation into a hole punched into the plaster wall. But my efforts didn’t seem to make either house more energy-efficient. In the house that had an attic, I insulated the floor there. It was most often used from the 1700s to the early 1900s, before being supplanted in building projects by more modern gypsum plaster and plasterboard. Two of the houses I have owned had plaster walls, and I tried to seal gaps where the walls met the floors and the roof, to reduce air intrusion. Lath and plaster is a traditional building technique and finishing process for interior dividing walls and ceilings. I don’t subscribe to this I’m just sharing. ![]() These walls were designed to breathe, meaning that they provide more than enough ventilation to prevent growth of mold. Some old-house experts have told me over the years that thick plaster walls and the wood lath underneath are thicker than most drywall. I assume that is not part of your overall plan, however. ![]() Many homeowners do this as part of remodeling projects, since the walls have to be ripped into anyway. It is possible to insulate lath and plaster walls.
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