Relative humidity in homes / Guides

Condensation on windows leads to mold & mildew in homes, ERV & HRV systems help
Ventilation

Ventilation & air exchangers

...ing indoor air quality and reducing total HVAC ratings and energy requirements. ERV technology is not only an effective means of reducing energy cost and heating and cooling loads, but allows for smaller equipment. Additionally, ERV systems allow for maintaining the ideal relative humidity of 40% to 50% in indoor hom...

What is Interstitial Condensation? (And how to stop it!)
Walls and Roofs

What is Interstitial Condensation in Walls or Roofs? (And how to stop it!)

...in winter when warm, moist, internal air from inside a structure finds its way into cold exterior walls, floors or roof and ceilings . It can also be caused in in summer months in conditions of high external humidity in combination with heavily air conditioned homes that have interior poly vapor barriers - but more of ...

Basement Design for walls prevents mold & midlew when renovating & finishing
Healthy indoor air quality

Basement renovations: How to prevent mold when finishing basements

...ing indoor moisture and the hidden moisture within basement wall assemblies will control the growth of indoor mold. According to the EPA , indoor relative humidity (RH) in homes should be kept below 60 percent - ideally between 30 percent and 50 percent, In addition to preventing mold forming, maintaining the correct...

Condensation on windows in our homes - why is it there? - how to stop it?
Walls and Roofs

Condensation on windows is a pain but is it a problem & how to stop it?

...in peace!) – Surprising how rarely Mom’s buy into this as a plan! Interestingly, up to half of the high humidity solution is changing personal habits in the home: Showering - The bathroom is the most humid place in the home, and something as simple as taking a shower releases huge amounts of humidity into the air...

Poly vapour barriers in air conditioned houses can cause mold and rot
Healthy indoor air quality

Why you should Never Install Air-Con in a Home with a Vapor Barrier

...increased interior Relative Humidity levels, and the combination of that added interior moisture and cold wall surfaces caused by thermal bridges in framing puts the paper surface of drywall at a severe risk of condensation in winter. The interior environment of homes has changed significantly in the last few decades...

Which Houseplants are Best to Clean Air & Remove Toxins?
Healthy indoor air quality

Which houseplants are best for purifying air? Ecohome investigates

...intaining health, succumbing to these internet myths and relying on plants to clean your air may worsen the indoor air quality in your home. It’s far better to follow practical and proven methods and guidelines, such as those laid out in home rating systems like LEED . One example of something the internet has spread a...

Problem areas of air leakage in a home and blower door test being cond
Air and vapour barriers

Airtight Construction of Homes is Essential: "Your house sucks." "Oh yeah? your house blows!"

...in temperature between inside and out, the greater the concern. Negative air pressure in houses in winter will draw in cold air , making your house feel drafty and increase your heating costs. The issue isn't about durability but rather comfort and cost due to heat and energy loss. Positive air pressure in a home i...

Natural Building Insulation Made of Grass - Eco-friendly, Green
Insulation and soundproofing

Non-toxic natural building insulation made of grass

...ing the carbon footprint of buildings. Finding natural ways to insulate a home is all well and good, but any natural building insulation needs to perform as well as the mainstream commercial alternatives if it is to be a viable player in the green home building industry. Organic insulation materials can, in some inst...

Frost in Attics: What causes Attic Ice? How to Fix it?
Roof assemblies - renovation

Why is there frost in my attic? Is ice in roofs a problem & How do I stop it?

...ing - Is the ceiling vapor barrier intact and doing its job? There are 3 different issues to check for and to deal with to fix the problem of ice buildup in an attic, and you really should work towards accomplishing all of them. 1. High humidity in homes First of all, if the relative humidity of air in your hom...

Skylights can be problematic in a high performance home
Windows and doors

Are skylights an asset or a liability?

...in mine. The problem with a skylight is that it presents an entirely new series of challenges for a building envelope. New homes have ceiling insulation starting around R40, and finding them as high as R60 and R70 is not that unusual anymore, nor is that much insulation overkill in a really cold climate. In contrast,...

Finished basements can lead to mold and mildew
Healthy indoor air quality

Why are basements moldy? How to fix or Prevent a Moldy Basement

...initial building costs, not future repair costs, energy performance or protecting the health of occupants by mitigating mold formation. They most certainly are not based on the laws of physics,that is the one thing we know for sure. 3) The cheapest way to insulate a basement is on the inside, and using finishing mate...