Humans aren’t good “talking” thermometers, because we “feel” thermal conductivity. Want proof? As my college physics prof often told us, you’d rather the outhouse had a wood seat than a porcelain one on a cold night (even though they’re the same temperature)!
Picture this: you’ve been tagged to design the building envelope for the next national institution. Maybe it’s an addition to the Smithsonian, or a presidential library. In any case, you are building for posterity, and this thing has got to last. What do you do?
The challenges are great for building envelopes, which must keep the water, air, vapor, and heat of the surroundings from affecting the interior space. But despite all the possible combinations of climate to be found in North America, there is one basic design that works from sea to shining sea.
Water, air, and vapor are harder to quantify than heat which is why the code spends less time discussing them. But if your wall fails to control them, all the insulation in the world won’t help.
The evidence supporting the effectiveness of NFPA 285 is very strong and history bears out this conclusion. Since its introduction in 1988, the NFPA 285 test has remained relatively unchanged, and 30 years of use has generated no evidence of any life safety deficiencies.
A question has arisen regarding the use of NFPA 285 and ASTM E84 in the context of IBC Section 2603.9, Special Approval. Specifically, there is difference between the 2012 and the 2015 versions of the International Building Code (IBC) due to a change in language during the 2015 code development cycle.
There has been recent confusion over the following section of the building code regarding “exterior wall coverings” in Types I and II construction, this article provides code references and resources to clarify the intent of the code.
The evidence supporting the effectiveness of NFPA 285 is very strong. Moreover, history bears out this conclusion as found in this report sponsored by DuPont.
To facilitate greater depth of knowledge and understanding about how to use CI to its greatest benefits, the https://continuousinsulation.org website was developed to provide extensive counsel on a variety of topics related to commercial and residential use of CI in construction.
Sometimes called the “perfect wall,” this design puts all the control layers (for temperature, moisture, air, and water vapor) on the outside of the wall, thereby protecting the structure. The only variable for this design is the thickness of the exterior continuous insulation.