Elements of a Healthy
This article is designed to give the reader a general overview of what materials and practices go into a Healthy House. This list is not all inclusive, but it concentrates on what is widely available in Nova Scotia. Although it is important to look at both the inside and outside of houses, I will focus on the elements of the inside, the living envelope. One caveat when using this as a guide is that you must always test the materials to see if you (or your co-habiters) are sensitive to them BEFORE you install them.
When considering the costs and benefits of renovating an existing house to become a healthier house, you should first consider the materials used on the largest surface areas (i.e. floors, walls and ceilings). Also, on the priority list are safeguarding the bedrooms, where people spend one third of their lives.
The following sections are explanations of healthier building material options for the major parts of the house.
Carpet holds dust, dust mites, mould and bacteria. It is also difficult to clean and in most cases off gasses chemical fumes (the infamous “new carpet” smell). The CBS program Street Stories included a segment about the hazards of carpets about a year or so ago. It included an experiment performed by a laboratory which tested the reactions of mice when air was blown over new carpet from which the mice had to breathe. Within 24 hours, all of the mice were dead or severly crippled. The US Environmental Protection Agency removed carpets from all of its offices, but stopped short of announcing it as a danger to human health.
Cushion flooring off gasses VOC’s and is not recommended.
Walls & Ceilings
Wallpaper is generally not very good because of the off-gassing of chemicals found on the surface. Water-based stenciling is very acceptable for decorating.
Healthier countertop materials include Corian (a solid polymer which can have any scratches sanded off), granite or ceramic tile on exterior grade plywood (exposed plywood would have to be sealed).
Shelving material recommended for use includes solid hardwood, exterior grade plywood encased by arborite or epoxy-coated wire (Lee Rowan is a popular brand of this type of shelf).
The stove should
be vented directly outdoors.
Mould is major problem here (see CMHC Mould article), as well as radon, which is a radioactive gas emitted from the ground. Parts of Nova Scotia are high risks areas for radon, including parts of Halifax.
Consult the Department of Energy, Mines and Resources for more information. You can also have your basement tested for radon (some of the companies advertising in this publication offer radon testing).
If you wish
to go with a basement, make sure it is well sealed at all the joints and
around plumbing drains (no part of the ground should be exposed).
A proper vapor barrier should be installed below the concrete floor.
Also, make sure there is adequate ventilation to exhaust the expected moist
air or else you will run into a mould problem which can be difficult to
get completely rid of.
Carbon monoxide is an invisible, ordorless gas which can kill when it is present above certain levels and can cause flu-like symptoms over extended periods due to continued low level exposure. As furnaces age (or furnaces without adequate air supply), they tend to burn less effectively and are more of a risk to emit noxious gases.
Electric baseboard can act as a dust collector and burns dust and dust mites when the heat comes on.
Ideally, you want a house that does not require a chimney (i.e. no fireplace, furnace or wood stove).
Contrary to popular belief, ventilation is not the panacea for air quality problems. You must first eliminate as many offending materials as possible, and then the remainder you encapsulate (seal) or ventilate.
Consider switching to unscented products. A lot of hospitals, schools, office buildings, churches are initiating Scent-Free policies (see Scent-Free list in this issue). This is in response to the growing evidence that scented products adversely affect air quality, much in the way second-hand smoke does (i.e. both involve chemical emissions).
Any paint cans or other potentially harmful items should not be stored in the living envelope (this includes basements) as they have the potential for leaking fumes, even if they are covered.
There is limited amount of space to cover a topic such as this, so if you wish to get more details, consider ordering some of the literature provided by the CMHC (see advertised list).
and Audrey Barrett, of Healthy Homes Consulting, teach courses on this
subject and are highly recommended (coming from a person who has taken