Sheet vinyl & linoleum floors, some with asbestos?
Non-resilient floor coverings
Wood flooring
Carpeting in buildings
Laminate floors, wood floors, tile floors, wall to wall carpeting
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Here we provide a guide to identifying different kinds of flooring materials in buildings and we include articles on individual flooring type inspection, diagnosis, & repair. The age of a building can be determined quite accurately by documentation, but when documents are not readily
available, visual clues such as those available during a professional home inspection can still determine when a house was built. In this article we list some helpful
clues to answer the question "how old is the house?" and we provide photographs of key visual
clues useful for determining the age of a building.
Guide to Inspection & Diagnosis of Flooring Materials in Buildings
Resilient Floor Coverings Used in Buildings
Resilient floor coverings include organic flooring materials such as asphalt tile, cork tile, linoleum, rubber flooring, vinyl tile, vinyl sheet flooring.
Asphalt Tile Flooring - 1920 - 1960 (est)
Asphalt floor tiles are 9" square (or other sized) tiles which used asphalt as the main binding material. the original asphalt tiles were produced only in dark colors because asphalt was a main ingredient.
The black tiles shown at left were not dated and may be a newer product, but in general, if you find very old black floor tiles they are probably an asphalt-asbestos product.
Rosato indicates that the first publicized asphalt tile installation was in 1920 in New York City's Western Union office. The product was very successful and by 1936 over four million square yards of asphalt floor tiles were being sold annually.
By 1940, 5% of floor coverings sold in the U.S. were asphalt tile. -- Rosato In 1920 asphalt roofing manufacturers, who had been using asphalt and fiber binders to make asphalt roofing shingles for some time, tried to develop a rigid product that could be a substitute for (more costly) slate roofing. The material did not perform acceptably as a roof covering, but it led to the development of asphalt floor tiles.
At AGE of a BUILDING - how to determine in our section titled Flooring Materials we discuss the eras during which various flooring materials were first used in modern buildings and how to use these to help identify the age of a building.
Asphalt Floor Tiles Pose an Asbestos Risk
Asphalt-asbestos floor tiles were produced at first in dark colors using a heavy asphalt binder combined with a very high percentage of asbestos filler fibers. It would be uncommon to find these floors still in use today, but if you encounter black or very dark asphalt floor tiles they are probably very high in asbestos fibers. We discuss floor tiles as an asbestos fiber source in buildings in more detail at Floor Tiles Containing Asbestos where we elaborate the concerns about asbestos used in the manufacture of asphalt-based floor tiles.
Colors & Composition of Asphalt Asbestos Floor Tiles
Asphalt -asbestos tiles manufactured early in their life (1920's) were either black, near black, brown, or a gray-brown tone. Brown asphalt-asbestos tiles were made by substituting gilsonite as a binder. In both cases the tiles were hardened by evaporating a solvent used in the fabrication process, or by cooling of hot asphalt used in the mixture.
Gilsonite could be used to produce a wider range of mixtures, but required some asphalt as a softener. Dark vinyl-asbestos tiles used, for example, a mixture of 40 parts asphalt or gilsonite, 60 parts asbestos floats, 30 parts powdered limestone, and pigments (parts by weight). Another typical mixture cited by Rosato contained 70% asbestos fiber
Cork Flooring Tiles
Cork floor tiles were considered a warm, quiet, but less durable resilient floor covering than some of its competitors. It was sold often for use in residential dens, family rooms, or other warm, low-traffic areas, and it may have been popular (research needed) for use in areas where workers had to spend long periods standing - where it would have competed with rubber floor coverings. In 1952 cork flooring sales made up 2% of total floor tile sales. -- Rosato p88.
Vinyl Asbestos Floor Tiles - 1930 - 1976 (est)
Vinyl floor tiles, including vinyl-asbestos floor tiles and homogenous vinyl floor tiles (non-asbestos product) are almost as old as asphalt floor tiles. By the early 1950's in the U.S. vinyl tile floor products were more popular than asphalt-based flooring. The reason is pretty obvious.
Asphalt-based flooring as it was originally produced used heavy asphalt products which meant that the floor tiles could be made in dark colors only. Soon after asphalt-asbestos floor tiles were marketed manufacturers heard from their buyers that consumers wanted lighter floor tiles and tiles of varying color and pattern.
Organic resin vinyl increased in popularity for this reason, but slowly. By 1952, the production of vinyl plastic floor tile sales in the U.S. was about half the volume of asphalt floor tiles, selling 35 million square yards.
We discuss vinyl-asbestos floor tiles as an asbestos fiber source in buildings in more detail at Floor Tiles Containing Asbestos where we elaborate the concerns about asbestos used in the manufacture of vinyl based floor tiles that used high levels of asbestos fibers as a filler material and to provide other properties to that product. More photos of vinyl asbestos floor tiles, including microphotographs of vinyl-asbestos floor tiles can be seen at our article at Floor Tiles Containing Asbestos.
Sheet Flooring Materials That Indicate Age of a Building
Here is a photograph of an early (pre-vinyl) continuous floor covering, ca 1900, in an 1840 historic Vermont house.
Note the fabric backing of the flooring material.
Here we discuss various common flooring materials (rough wood, finished wood, parquet, carpeting,
linocrusta, sheet vinyl, and other items as they assist in determining the age of a house or other building.
Linoleum Sheet Flooring As an Indicator of Building Age - 1890 - 1960 (est)
The resilient flooring product shown at left was made in the late 1990's and is not an asbestos concern, though in this case the flooring was damaged by water and movement of a cabinet.
According to Rosato, "The original resilient floor coverings were developed during the latter part of the Nineteenth Century by Frederick Walton.
The original covering was linoleum for use as a floor decking on British naval ships." The composition of the original products included asphaltic binders to which an asbestos filler was added by mixing on a rubber mill.
List of Non-Resilient Floor Coverings Used in Buildings
Non-resilient floor coverings used in buildings that can assist in determining the age of a structure include bamboo, brick, concrete, stone, and a wide variety of wood products.
Laminate Wood & Plastic Flooring Products
The laminate wood flooring shown at left was buckled and destroyed by flooding caused by a leaky heating pipe. As we discussed with traditional wood flooring above, severe flooding or installation errors can lead to total loss of the finish floor system.
Contemporary snap-together flooring products that resemble wood or other surfaces, but are made of plastic, and other pre-finished and ready-to-assemble wood flooring products are a much more modern product.
Pergo (TM) laminate flooring, for example, was developed by Pergo AB, a Swedish company founded around 1890 as a vinegar manufacturer. Product development for Pergo laminate flooring began in 1977 and was first brought to the market in 1984. Pergo laminate flooring was first sold in the U.S. in 1994.
It's safe to say that if you see a Pergo product in building in U.S. the flooring was installed no longer ago than 1994. But because this product is has been widely used as a renovation material installed atop older pre-existing finish floor surfaces, one should not presume that the product age is the same as the building age unless the floor was installed as original material - that is, unless it was not installed over an older floor covering.
Just seeing Pergo TM laminate flooring over a plywood subfloor is not sufficient data to conclude the age of a home. Older carpeting may have been removed to expose a plywood subfloor over which the laminate flooring was then installed.
Wood Flooring Inspection, Diagnosis, Repair
Wood flooring, one of the most warm and beautiful materials that can be placed in a home (OPINION-DF) needs to be installed following proper practices.
The gaps that appeared in the wood floor shown at left were caused by installation of the floor in a new home, over radiant heat tubing, and without allowing the flooring to reach a proper moisture level before it was nailed in place.
Extreme buckling can cause an upwards explosion of a wood floor when flooring is exposed to flooding or prolonged leaks.
This severe buckling wood floor damage can occur even at much smaller increases in interior moist sure if a tongue and groove wood floor is improperly installed - leaving inadequate free space margin around the floor perimeter.
See Wood Floor Types for a catalog of types and ages of wood flooring.
See Wood Floor Damage for details of types of damage to wood flooring and for a description of wood floor repair approaches.
Tile Floor Inspection, Diagnosis, Repair
Cracked floor tiles like this can be diagnosed in order to decide if the cracking shows a serious structural problem, inadequate floor support, mechanical damage, or as in this case, damage from a loose, rocky toilet.
More Places to Look for Hidden Mold in Buildings includes a discussion of how even a slight slope in a tile bathroom floor leads to bath leaks under and behind bathroom vanity cabinets and floor trim, and we discuss how to prevent this problem
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Rosato: Asbestos products and their history and use in various building materials such as asphalt and vinyl flooring includes discussion which draws on Asbestos, Its Industrial Applications, D.V. Rosato, engineering consultant, Newton, MA, Reinhold Publishing, 1959 Library of Congress Catalog Card No.: 59-12535 (out of print).
Pergo AB, division of Perstorp AB, is a Swedish manufacturer or modern laminate flooring products. Information about the U.S. company can be found at http://www.pergo.com where we obtained historical data used in our discussion of the age of flooring materials in buildings.
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