Air quality today
3 years ago
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HRV and air quality
Comments (13)This is an old thread, but since it's been resurrected, I thought some additional information would be helpful. Residential indoor air quality standards are evolving--as they should. Energy conservation goals are driving the construction of "tighter" homes which can result in elevated concentrations of moisture and indoor pollutants. Ventilation strategies need be implemented to deal with each. Strategies such as opening windows and turning on fans may be helpful for rapidly ventilating a living space following an event that generates smoke or an unpleasant odor (like when I'm doing the cooking, for example) or to deal with high relative humidity following an event like a shower or to provide short duration make up air for a high-capacity range hood. But, unless you live in a climate where you can live with open windows year 'round, it's not the best strategy to deal with a continuous source of indoor pollutants as is the case with chemical off-gassing of construction materials, and furnishings. Nor is it the best strategy if outdoor air pollutants (e.g., pollen) are a problem for one or more occupants. In those cases, a controlled mechanical ventilation designed for the specific purpose is a better strategy. With respect to formaldehyde, guidelines vary from country to country, but most suggest around a 0.1 ppm maximum concentration to preclude health issues. If you know the average concentration in your home and the volume of the conditioned living area, you can calculate the supplemental ventilation rate required to keep it under 0.1 ppm. That said, if the main contributor to the problem is localized (e.g., new kitchen cabinetry) the average ventilation rate is of less interest than the local (i.e., kitchen) ventilation rate--especially if you spend a lot of time in your kitchen. The required local ventilation rate should decrease over time as the rate of off gassing declines. Depending on the design of your home, the existing HVAC system, and the particular ventilation strategy, you may be able to use a single mechanical ventilation system or you might need one specific to the kitchen area and another for other areas of your home. I think you'll be well served to consult a HVAC design professional with experience designing and implementing ventilationsystems. That's not likely to be the same guy who services your HVAC equipment or the local sales guy....See MoreMarmoleum/Cork air quality, formaldehyde (UF), VOCs, and finish
Comments (3)Update after speaking with Forbo Product Support: After reading the Click MSDS, I noticed "polymerized resin" is the first ingredient. I explained to Forbo Support that urea formaldehyde (UF) is a polymerized resin and asked if Marmoleum Click was NAUF (no added UF). The technical support gentleman responded that the top linoleum layer contains very simple, natural ingredients and NAUF, but that if I'm concerned with the UF content of the HDF core of the Click, I should stick with Marmoleum sheeting or tiles, which use a zero VOC and NAUF glue. (Even so, I'm not crazy about all that glue.) I'm keeping these Marmoleum Click floors out of my home because I think that there is a strong possibility of UF in the HDF core and the very long duration of UF off gassing. I asked about the top coating and Support said that UV cured acrylic is one of the safest top coatings; a purely bio-based coating would likely lower flooring durability. I asked about the floor finish to recoat or restore the factory finish: it was recommended to use Forbo's Floor Finish every five to ten years, so chemical concerns shouldn’t be a major issue. Eh. A quick note: Cork flooring products OFTEN contain UF. Cork is essentially bark that's been glued back together. A really nice flooring option if it was actually NAUF. Be Careful: There are certain flooring supply websites that advertise their cork flooring as NAUF or no-added formaldehyde, when in fact the manufacturer of the product lists it differently. CHECK OUT THE MSDS OR OTHER DOCUMENTS TO VERIFY!! EG: Amormim provides a DECLARE label for its cork flooring products on its website: Amormim clearly and ethically lists its ingredients, "Urea, polymer with formaldehyde." I’ve seen two online sellers that list this very product as NAUF or no-added formaldehyde. Personally, I’ve had no success finding NAUF cork flooring, click or glue-down. Not purchasing either of these green flooring types out of regard for indoor air quality. I do hope manufacturers continue their shift away from the cheaper UF resins. For now, I'll stick with 100% naturally oiled solid wood (e.g., tung, linseed, not sure yet) and porcelain tiling with zero or ultra-low VOC installation materials. I’ve read that porcelain (v. regular ceramic tiles) is cost-effective because it generally lasts many more years, reducing installation/demolition costs over time. (btw: use best practices to control air quality if you're cutting tile or ripping up tile made with quartz (crystalline silica)). Hope this helps!...See MoreAir Quality Issue Rolled Ins in Attic with Ceiling Deflectors Heat/AC
Comments (3)I just recently added rolled insulation to that same side of the house to combat the blast of cold air that comes through the bathroom exhaust vent - which really did not block the draft as I had expected and hoped (I even added a vent damper) Remove the vent cover & post a picture. You may have cold air coming in around the vent housing if there is a sloppy cut out and the perimeter of the housing isn't sealed....See MoreCode Red Air Quality
Comments (67)Chicago area is 'yellow', but NW Indiana and parts of Wisconsin are still 'orange'. We're promised rain Saturday night into Sunday. Long time no rain other than one 20 minute shower earlier this week. May was 2nd driest in history, and drought is continuing into June. There's a wet spot in the lawn. When we called the irrigation company they said they aren't making appointments for repairs. I'm hoping our landscaper still know a guy who knows a guy....See More- 3 years ago
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