Cavity walls were first used in Greco-Roman times but re-emerged in the late 19th century and became widespread in the 1920s. Originally developed to prevent moisture from penetrating solid walls, they became the standard for UK housing after 1945. Metal wall ties connecting the two skins emerged in the late 19th century.
Homes built before 1929 all tend to have solid walls, as cavity walls had not been invented. Homes built between 1930 and 1939 may or may not have solid walls. This is when cavity walls were becoming more popular but not yet "the norm". Very few homes were built 1939 to 1945 due to the second world war.
Older homes (circa 1920 – 1980)
These houses often have a cavity wall with a total thickness of approximately 26 centimeters. The cavity itself is on average about 6 centimeters wide.
In general, houses built from the 1990s onwards have wall insulation to keep the heat in. But if your house is older than that, it might not have any wall insulation. Here's our guide on cavity wall insulation: what it is, if it's suitable for your home, its benefits and how to get it.
Typically, houses built in the 1950s were solidly constructed of masonry but have little or no insulation, narrow cavity or cavity block walls, single glazing and leak energy, however, the are usually worthy candidates for sustainable renovation and energy efficiency upgrades.
Does cavity wall insulation need to be renewed? Cavity wall insulation usually lasts 25 years or more. Still, it may need replacement due to material degradation, moisture damage, structural changes, increased energy bills, or visible issues like dampness and mould.
Putting it in Perspective: Adjusting for Inflation
While the nominal price difference between a 3-bedroom house in 1950 and a 3-bedroom house in 1960 appears significant, it's important to consider inflation. Using a historical inflation calculator, that $7,400 in 1950 equates to roughly $90,000 in 2023 dollars.
The short answer is: it can last anywhere from 20 to 100 years, depending on a range of factors from the materials used to how well it was installed and maintained. In many cases, cavity wall insulation can last the entire lifespan of your property, especially if installed by qualified professionals.
Factors that decrease property value the most fall into three main categories: location issues, structural damage, and poor neighborhood conditions. These factors can collectively slash a property’s value by 5% to 30% or more.
Foam insulation is a common target because it's easy for them to chew through. The material offers little resistance, allowing mice to create tunnels or nests within the insulation. But mice aren't just interested in chewing for the sake of it—they're also drawn to the warmth and shelter insulation provides.
How age affects insulation performance: Older homes built in the 1970s or earlier need to have their insulation replaced, especially if the insulation hasn't been replaced since. Common types of insulation in older homes include old fibreglass batts, cellulose, rockwool, foil, sawdust, wool, and polyester.
Brick pattern – If all the bricks in the wall are laid lengthways (stretcher bond), it usually indicates a cavity wall. Solid walls often show alternating short and long ends of bricks (English bond or Flemish bond).
A photo I took comparing new 1/2” drywall (left of door frame) to 50's-60's era interior walls. I believe it's 3/8th” gyprock lath, with a healthy layer of plaster over top (maximum thickness 5/8” at points).
Meanwhile, the least desired home styles appear to be shipping container homes and tiny homes, the study finds.
Yes, cellulose insulation significantly deters mice when compared to traditional materials like fiberglass. It acts as a physical and chemical barrier in a few key ways:
You can legally sell a home with asbestos, but you must follow disclosure laws. Removing asbestos is not always required, but it may help with the sale. It's possible to sell as-is, especially to investors or buyers willing to take on the project.
The Amish control mice through non-chemical, self-sustaining methods, relying on active trapping, natural scent repellents, and structural exclusion. Rather than using commercial poisons, they focus on physical barriers and natural predators to keep rodent populations in check.
Rats are a primary food source for a wide variety of animals. Their most significant natural and artificial predators include:
Because spray foam can trap moisture, hide the condition of the roof, make it difficult for surveyors to inspect, which means risks like timber decay, dry rot, and not forgetting increased fire risk. If you've got it or you're buying a property that does, this is something you need to know upfront.
Since demand outweighs supply, housing prices are higher, and homes sell faster. Meanwhile, the worst months to sell a house are November through March or during the fall to winter, when potential buyers are preoccupied with holiday plans. Sellers should expect lower sales prices and higher DOM during these months.
As of 2023, China has one of the highest home ownership rates in the world, with 90% of urban households owning their homes.
The biggest red flag in a home inspection is compromised structural integrity, frequently caused by hidden water damage or foundation issues. While minor electrical or plumbing fixes are easy to manage, structural failures compromise the safety of the entire home and can cost tens of thousands of dollars to repair.
What time of year is Insulation cheapest?
The healthiest, non-toxic insulation for your home is natural sheep's wool or hemp insulation. These materials contain no chemical binders or formaldehyde, actively regulate indoor humidity to prevent mold, and do not off-gas.
It's recommended to leave an air gap insulation of at least 25mm or 1 inch for the walls and ceilings. This should be enough to allow for ventilation and prevent moisture buildup. The same rule may be applied when using foil insulation. On roofs, the air gap should be larger, typically around 50mm or 2 inches.