CAULKING SEAL THE DEAL
For the most part, latex-based caulkings tend to release less toxins during application and initial drying than their solvent-based counterparts.
But the verdict is still out about how latex products impact air quality over the long term. It’s important, however, with both paints and caulkings, never to use exterior products indoors. The level of off gassing is likely to be much higher for exterior products.
There’s also the question of durability. While 100% silicone caulk produces strong initial off gassing (some of which is from vinegar in the mix) it’s also likely to perform better than an acrylic-latex based product, particularly in wet areas.
As you can see, choosing a green paint or adhesive is not always as easy as reading a label. You have to shop carefully, understand how and when this product should be applied, and weigh whether the product’s air quality benefits are as good as they sound. GB
GLOSSARY OF TERMS KNOW THE LINGO
> Volatile Organic Compounds (VOCs)
Toxic ingredients common in paints, adhesives, and many household items that are released into the air.
> Hazardous Air Pollutants (HAPs)
These substances were listed in the 1990 Clean Air Act Amendments. Here’s the EPA list:
http://www.epa.gov/ttnatw01/187polls.html
> Alkyd
Commonly referred to as “oil based,” this type of coating is typically higher in VOCs than water-borne paint, containing a petroleum-based solvent and a binder of synthetic resin.
> Acrylic Latex
This widely used finish uses water as a solvent, and tends to be lower in VOC content than alkyd products, although it may offgass more slowly.
> Breathe
How well a paint allows water vapor to pass through it without blistering or failing.
> Back Priming
Coating the back or hidden face of siding or trim prior to installation as an added measure of protection from moisture.
LOW-EMITTING MATERIALS:
PAINTS AND COATINGS REQUIREMENTS
For architectural paints, coatings and primers applied to interior walls and ceilings, these are the Green Seal standards for VOC content limit (in grams per liter).
Flat finishes: 50g/L
Non-flat finishes: 150 g/L
For anti-corrosive and anti-rust paints applied to interior ferrous metal substrates, the limit is somewhat higher: 250 g/L
For clear wood finishes, floor coatings, stains, sealers and shellacs applied to interior elements, the VOC content limit is as follows:
Clear wood finishes: 350 g/L for varnish and 550 g/L for lacquer
Floor coatings: 100 g/L
Sealers: 250 g/L for waterproofing sealers; 275 g/L for sanding sealers; 200 g/L for all other sealers
Shellac: 730 g/L for clear and 550 g/L for pigmented; Stains: 250 g/L
Source:
www.leeduser.com
11.2011
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