absorbed by nylon or wool fiber. The reaction to humidity or moisture is greater with level loop nylon carpet because the yarn is BCF (Bulked Continuous Filament). That is to say, the yarn is made up of continuous filament fiber which you can compare to fishing line; long lengths of unending fiber in the carpet, running from one end to the other. Think of it like this; carpet made with continuous filament level loop yarn is like a chain link fence. When you grab one section of the fence; the entire fence moves. If the carpet is cut pile
the reaction is much less, think of this type of carpet as a picket fence. When you grab it, only one picket is affected as the sections are not connected. That covers simply, the moisture and humidity affect part. Temperature will affect the backing and on most tufted carpet the primary backing is woven polypropylene
and in many cases, so is the secondary backing. As mentioned earlier, polypropylene is not affected by moisture but it is affected by temperature. So if you have both the moisture in play and temperature you can have a very active and reactive carpet on the floor. If flooring material is not acclimated in the
space prior to installation it can create fits for the installation contractor and the end user. Acclimation, which is a very controversial and contestable
subject, means the flooring material has had an opportunity to relax in the installation space. The space should be at the temperature and humidity it would be when occupied by human beings. This is a bone of contention in the industry
and with end users, general contractors, architects and designers. The issue is going to exist as long as projects are “Fast Tracked” and people conform to and
employ “green initiatives.” This means the space may not have fully operational HVAC (heat and air) until the C of O (Certificate of Occupancy) is furnished, which can’t be done until the space is inhabitable. The space can’t be deemed inhabitable until it can accommodate occupants, which puts things in a Catch 22position. In other words we’re trying to put the cart before the horse which creates all kinds of problems and not just for the flooring material but other materials in the space as well. The other issue that has a tremendous affect on the flooring material and the installation is moisture in the substrate. This is actually a problem that has reached epidemic proportions of flooring failures and it is very misunderstood and mystifying to the point of being unbelievable. Moisture in concrete, which is always present regardless of how old the concrete is, moves in and out of the concrete. The moisture moves from high pressure to low pressure, so when the HVAC system cycles there is moisture vapor movement in and out of the concrete. As the temperature and humidity vary in a space the
movement of moisture does to, this is the law of physics at work. To deny this science is like denying human beings breath. Concrete should be thought of as a living organism. It is affected by changes in the environment. As moisture vapor moves in or out of concrete it affects the flooring material applied to it. If the flooring material is permeable, like broadloom carpet, the moisture vapor can move through the carpet. In this process the moisture vapor brings with it the alkalinity inherently in the concrete. The alkalinity of concrete is at least 12.5 ph. more