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-The Project Gutenberg EBook of The Preservation of the Exterior of Wooden
-Buildings, by Allerton S. Cushman and Henry A. Gardner
-
-This eBook is for the use of anyone anywhere in the United States and most
-other parts of the world at no cost and with almost no restrictions
-whatsoever. You may copy it, give it away or re-use it under the terms of
-the Project Gutenberg License included with this eBook or online at
-www.gutenberg.org. If you are not located in the United States, you'll have
-to check the laws of the country where you are located before using this ebook.
-
-Title: The Preservation of the Exterior of Wooden Buildings
-
-Author: Allerton S. Cushman
- Henry A. Gardner
-
-Release Date: June 21, 2020 [EBook #62444]
-
-Language: English
-
-Character set encoding: ASCII
-
-*** START OF THIS PROJECT GUTENBERG EBOOK PRESERVATION EXTERIOR WOODEN BUILDINGS ***
-
-
-
-
-Produced by Charlene Taylor, Tom Cosmas and the Online
-Distributed Proofreading Team at https://www.pgdp.net (This
-file was produced from images generously made available
-by The Internet Archive/American Libraries.)
-
-
-
-
-
-
-
-
-THE INSTITUTE OF INDUSTRIAL RESEARCH
-
-
- Allerton S. Cushman, A. M., Ph. D., _Director, In Charge
- Division Metallurgical Problems_.
-
- Henry A. Gardner, _Assistant Director, In Charge Division of
- Paint Technology_.
-
- N. Monroe Hopkins, Ph. D., _In Charge Division of Electrical
- Engineering and Electrochemistry_.
-
- Chas. A. Crampton, M. D., Ph. G., _In Charge Division of
- Food and Drug Products_.
-
- G. W. Coggeshall, Ph. D., _In Charge Division of Mill
- Problems_.
-
- Chas. Baskerville, Ph. D., F. C. S., _In Charge Technology
- of the Rarer Elements_.
-
-
-Copyright, 1911, The Institute of Industrial Research
-
-
-
-
- THE INSTITUTE OF INDUSTRIAL RESEARCH
-
-
- THE PRESERVATION
-
- OF THE
-
- EXTERIOR OF WOODEN BUILDINGS
-
-
- BY
-
- ALLERTON S. CUSHMAN, Director
- THE INSTITUTE OF INDUSTRIAL RESEARCH
-
- AND
-
- HENRY A. GARDNER, Asst. Director
- IN CHARGE DIVISION OF PAINT
- TECHNOLOGY, THE INSTITUTE OF INDUSTRIAL RESEARCH
-
-
- [Illustration]
-
-
- WASHINGTON 1911
-
-
-
- WASHINGTON, D. C.
- PRESS OF JUDD & DETWEILER, INC.
- 1911
-
-
-
-
-
-PREFACE.
-
-
-For a number of years the writers have been making a study of
-industrial problems and have been publishing the information which they
-have acquired, regarding the value of various structural materials,
-for the benefit of consumers as well as producers. The Institute
-of Industrial Research has received so many requests recently for
-information in regard to just what paints should be selected for the
-protection and decoration of houses and other buildings that it has
-seemed best to sum up the subject in the form of a special pamphlet
-or bulletin. It is only after years of investigation work carried on
-by the authors, both separately and in co-operation, that any review
-of the work has seemed possible, for only recently have the results
-of tests carried on in a number of different localities seemed to
-justify a definite opinion in regard to the best selection of exterior
-paints. No attack on any one paint material is here included, but the
-value of each has been carefully weighed, and the attempt is made
-to discuss them in the light of experience and knowledge. It is the
-authors' intention in this bulletin to put into the hands of architects
-and paint users who may not be thoroughly familiar with the technical
-properties of paint materials, information which will enable them to
-make a proper and intelligent selection of paints for the preservation
-and decoration of the exterior of wooden buildings.
-
-
-
-
-The Preservation of the Exterior of Wooden Buildings
-
-
-_Lumber and its Relation to Paints_: The proper choice and treatment of
-lumber is one of the most important problems which the builder as well
-as the painter has to face. When about to build a dwelling, barn, or
-other structure made principally of wood, the question is sure to arise
-in regard to what variety to select so as to get the maximum service
-and money value. The locality in which the structure is to be built
-must often have a bearing upon this question. While it is true that the
-painting of each type of wood demands the special consideration of the
-painter, it is also true that the study of paints for wood protection
-points toward the production of a paint that will give satisfactory
-results under all conditions and on all grades. It is the writers'
-opinion that a paint may be made that will be perfectly well suited
-for the preservation of every species of wood, provided the paint is
-properly treated in the hands of the skillful and intelligent painter,
-who can produce lasting results on almost every type by varying the
-proportion of thinners and oil in the various coats. The painter who
-uses the same paint on soft pine, and again on hard pine, without
-making a special study of how to reduce the priming coat for the hard
-pine, will be likely to get inferior results on the latter. In case
-of failure, the natural impulse is often to place the blame upon the
-paint, whereas the real responsibility may rest upon the painter's lack
-of knowledge.
-
- Note.--For a more detailed account of the lumber question,
- see "Modern Lumber as a Problem for the Painter," read by
- John Dewar, at the Convention of Master House Painters' and
- Decorators' Association of Pennsylvania, January, 1911,
- Pittsburg, Pa.
-
-
- Photographs Showing Different Forms of
- Decay Exhibited by Improperly
- Made Paints
-
-[Illustration: Blistering]
-
-[Illustration: Chalking]
-
-[Illustration: Checking]
-
-[Illustration: Cracking]
-
-[Illustration: Scaling]
-
-[Illustration: General Disintegration]
-
-_Signs of Paint Failure_: Those who are responsible for the care and
-maintenance of property are familiar with the condition of surface
-presented by almost all wooden buildings or structures which have been
-improperly painted with inferior paints. "Chalking" or "flouring"
-are terms used to describe the condition of a paint surface which
-has deteriorated within the paint film. The formation of minute
-fissures, generally spoken of as "checking," as well as the effects
-best described as cracking, scaling, peeling, and blistering, are
-other signs of failure which cause paint coatings to present an
-unsightly appearance, and which point inevitably either to the use of
-improperly made paints or to improper application. The cause of these
-conditions is not difficult to understand when even a brief study of
-the character of the materials entering into the composition of a paint
-has been made. It is, however, a fortunate circumstance that the proper
-admixture of different types of pigments enables us to correct the
-strong tendency exhibited by special pigments to rapidly deteriorate
-in an oil film. This point will be more fully discussed in a later
-paragraph.
-
-
-_Requisites of a Good Paint_: Progressive manufacturers are aiming to
-produce a paint which will show, under the widest range of conditions,
-good hiding power, adhesiveness, freedom from internal strains,
-permanency of color, relatively high imperviousness to moisture,
-sufficient elasticity to prevent scaling or cracking when subjected
-to expansion or contraction, and freedom from the chemical action
-which results in deep checking or excessive chalking. Such a product
-as this cannot be attained, in the writers' opinion, by the use of
-any one pigment in linseed oil. In order to meet all the demands as
-stated above, there should be in an economical and durable paint a
-proper percentage of the various pigments which, united, will tend to
-correct each other's faults, and thus produce a durable paint coating
-of maximum efficiency.
-
-
-_The Composition of Paints_: As is well known, a paint is a mixture of
-one or more pigments and a vehicle which acts the part of the spreading
-and binding medium. Up to the present time the vehicle portion of
-paints has generally been made of linseed oil, admixed with some
-volatile thinner, such as turpentine. The subject of oils and paint
-vehicles will be discussed more fully later on.
-
-
-_Physical Properties of Pigments_: The pigment portion of a paint
-for use on barns and farm buildings may, if desired, be composed
-of properly selected iron oxides or other colored pigments, even
-containing in some cases a moderately high percentage of silica, clay,
-or other inert materials, and give perfectly satisfactory results. For
-the preservation and decoration of dwellings, however, the pigment
-portion of paints is generally made as a whole or in part of the more
-expensive white pigments, such as white lead and zinc oxide. The
-relative values and properties of these white base pigments will now be
-taken up.
-
-
-_White Leads_: White lead, either of the corroded or sublimed type, is
-perhaps the most generally used of all the white pigments as a paint
-base. Corroded white lead is a basic carbonate of lead, while sublimed
-white lead is a basic sulphate of the same metal. Both of these types
-are white, and admirably adapted as painting materials. They take
-relatively the same amount of oil and spread easily, producing paint
-films which are highly opaque and which, therefore, hide efficiently
-the surface upon which they are placed. Sublimed white lead is a
-relatively finer pigment than corroded white lead, and seems to show
-a tendency to chalk to a greater extent upon exposure to the weather.
-Corroded white lead is more alkaline, however, than sublimed white
-lead, and when used alone with linseed oil generally shows a tendency
-to chalk to a considerable extent in a short time and to show deep
-checking, thus permitting the admission of moisture. The alkaline
-nature of this pigment produces considerable action upon certain
-tinting colors and results in fading or darkening, when mixed with
-delicate greens or blues.
-
-The use of white lead has been condemned in some parts of this country
-as well as abroad, because of its alleged poisonous properties. While
-it is true that lead poisoning may occasionally occur in some factories
-where the workman and his conditions are not properly safeguarded, it
-is, nevertheless, a fact that lead poisoning very seldom occurs among
-painters of experience and cleanly habits. Carelessness in mixing
-white lead is, fortunately, a practice almost obsolete among modern
-painters. The use of paints already ground in oil by means of machinery
-to a pasty condition, allowing easy working and reducing, obviates the
-danger of lead poisoning from any such cause as this, even though the
-percentage of lead in such paints is in preponderance. Recent efforts
-that have been made by the legislatures of certain States to brand
-lead paints as poisonous are not only unnecessary, but show a complete
-ignorance of the problem.
-
-
-_Zinc Pigments_: Another pigment which has proved itself of great
-value to the painter is zinc oxide. The use of this pigment may be
-said to have almost revolutionized the paint industry of the world,
-and its increased consumption during the last ten years is sufficient
-evidence of its value as a painting material. Zinc oxide is produced
-by oxidation and sublimation of zinc ores and is not only extremely
-fine, but of great whiteness. It has good hiding power, although not
-quite so great as that shown by the white leads. It tends to produce
-a glossy surface, making it especially valuable for use on interior
-work and in enamels. When used alone it has the effect of hardening
-the oil film in which it is enveloped, and upon long exposure causes
-cracking and scaling. However, when the sublimed or corroded white
-leads are properly combined with zinc oxide, a more durable surface is
-produced, the shortcomings of each pigment being overbalanced by the
-good properties of the other. The proper combining properties of zinc
-oxide with white lead may be said to vary between 20 to 55 per cent
-of zinc oxide for paints designed for exterior use. In the opinion of
-the authors, lead and zinc pigments in the above percentage, properly
-blended and ground, make paints of far better wearing value than can be
-produced with either white lead or zinc oxide used alone.
-
-
-_Zinc Lead_: Zinc lead, a pigment sublimed from mixed lead and zinc
-ores and containing about equal proportions of zinc oxide and lead
-sulphate intimately combined, as well as leaded zinc, a produce
-similarly produced, but with the zinc oxide running about 75 per cent,
-are white base pigments of value, which are used to a considerable
-extent. They are generally slightly off color, however, and are
-therefore used most largely in paints which are to be tinted in various
-colors.
-
-
-_Lithopone_: Lithopone, a pigment produced by precipitation, and
-consisting of zinc sulphide and barium sulphate, is of great value in
-the manufacture of interior paints. On account of its liability to
-darken and disintegrate, however, it is seldom used on exterior work,
-although recent tests have shown that when used in combination with
-zinc oxide and whiting, it gives very promising results.
-
-
-_Crystalline Pigments and Their Use_: Barytes (barium sulphate), silex
-(silica), whiting (calcium carbonate), gypsum (calcium sulphate),
-asbestine (silicate of magnesia), and China clay (silicate of
-alumina) are white crystalline pigments which, when ground in oil,
-become transparent. All of these pigments possess the property of
-strengthening a paint film made of white lead and zinc oxide, and often
-increase the durability of such a paint. Barytes, silica, and China
-clay are especially valuable for this purpose. Asbestine, because of
-its needle-like structure and low gravity, prevents settling and acts
-as a reinforcer of paint films. Whiting or calcium carbonate should be
-used when zinc oxide is in excess in a paint, so that the hardness of
-the paint may be overcome.
-
-A white paint must be possessed of sufficient opacity to efficiently
-hide the surface upon which it is placed, when three coats are applied
-for new work or two coats for repainting work. Mixtures of the white
-leads and zinc oxide, with the latter pigment running not over 55 per
-cent, will easily produce such a result and wear well. It is generally
-deemed advisable, however, by most manufacturers to take advantage of
-the excessive opacity of such mixtures, which allows the introduction
-of moderate percentages of those inert pigments which give greater
-strength and other desirable features to a paint. The percentage of
-natural crystalline inert pigments to add to a white paint made of
-lead and zinc must, however, be moderate and insufficient to detract
-materially from the hiding power of the paint.
-
- Note.--Pigments such as silica, barytes, China clay, and
- asbestine are thoroughly inert. Recent investigations have
- proved that they accelerate the drying of linseed oil, but
- this is not due to any chemical action they exert, but rather
- to their physical action in distributing the mass of oil in
- which they are ground, and thus allowing a greater surface to be
- exposed to the oxygen of the air.
-
- It is also possible that some of the inert pigments may stimulate
- oxidation by catalytic or contact action, although they are not
- chemically active in themselves.
-
-
-_White-Paint Formulas_: From these conclusions which have come
-from wide experience in the testing of paints under actual service
-conditions, there can be recommended to the buyer of paints and to the
-manufacturer and master painter those machine-mixed paints in white,
-made by reputable manufacturers, the composition of which will show a
-mixture of white lead and zinc oxide, with the latter pigment within
-limits of between 15 to 55 per cent, and especially the same mixtures
-reinforced with the moderate percentage of crystalline inert pigments
-referred to above.
-
-Tinted paints possess greater hiding power than white paints, and
-the above proportions would be somewhat changed for a tinted paint
-containing any percentage of coloring material. Tinted paints are,
-moreover, far more serviceable than white paints, as will be shown
-later.
-
-
-_Mill vs. Paddle_: The mixtures under consideration should be ground
-in linseed oil by the manufacturer, through stone or steel mills, to
-a very fine condition, as it is only through proper grinding that the
-pigments can be properly blended. The mixing of paint by hand is,
-fortunately, to a large extent a thing of the past. The uneven lumping
-of hand-mixed paints are often the cause of their failure. Such ancient
-and crude practice should be avoided by every painter, for it is more
-economical to obtain semi-paste paints, properly ground by machinery,
-to such a condition that they may be easily broken up and tempered.
-Such paints may be reduced to the proper consistency with oil and
-volatile thinner for application to any kind of wood.
-
-In the opinion of the writers, a majority of the paints sold by
-reputable dealers and made by reputable manufacturers in this country
-are not only made from the best linseed oil and highest-grade pigments
-obtainable, but are put up in a form ready for the painter to thin down
-with full oil or turpentine reductions, either for priming work or to
-be used without reductions for finishing coats. The large metropolitan
-painter who wishes to make his own tints and shades may, however,
-prefer to have his mixed pigment paint ground by the manufacturer in
-heavy paste form for certain purposes.
-
-
-_Results of Field Tests_: A careful analysis of the results of field
-tests which have been carried on in different parts of the country
-would be far too voluminous for insertion in this bulletin. The
-official findings of special committees of inspection have already been
-published in special reports. Whereas there may still remain ground
-for some difference of opinion in regard to the interpretation of the
-results obtained on the various test fences, there can be no doubt that
-considerable information of the highest value has been yielded, both
-to the producers and consumers of paints. One of the principal results
-obtained from these tests has led to the opinion expressed above by the
-writers, that better results can be obtained by a proper mixture of
-selected pigments than by the use of any one pigment in linseed oil.
-This conclusion has also been reached by engineers of the United States
-Navy, and, as a result, the specifications of the Bureau of Yards and
-Docks for paints made of straight white lead and oil have recently been
-changed to call for white lead combined with upwards of 50 per cent
-of zinc oxide. Many engineers and master painters have interpreted the
-results of the tests in the same way, and the attention of the authors
-has been called to a number of opinions which show that the tendency
-of demand among those who are properly informed is for a high-grade
-combination type of paint rather than for any single pigment paint.
-
-
-_Color_: The selection of the color for a dwelling or other structure
-is a matter that depends largely upon the good judgment and taste of
-the owner, combined with the advice of the painter. One point, however,
-should be impressed upon the mind of both, namely, that PRACTICALLY
-ALL SHADES OR TINTS MADE UPON A GOOD WHITE PAINT BASE, THROUGH THE USE
-OF PERMANENT TINTING COLORS, WILL BETTER WITHSTAND EXPOSURE TO THE
-ATMOSPHERE THAN THE WHITE BASE USED ALONE. Owing to the cheerful
-effect produced by the use of white paint on dwellings, a very large
-quantity of white will continue to be used. If these white paints are
-designed in line with the suggestions brought out above--that is to
-say, if the white lead bases are properly reinforced with zinc oxide
-and other pigmentary materials--better results will undoubtedly be
-obtained, as far as appearance and durability is concerned, than if
-white lead had been used alone. The consumer should remember, however,
-that more durable results will be obtained by the use of tinted paints.
-
-
-_Reductions and Thinners_: Turpentine, with its sweet odor, high
-solvent action, and wonderful oxidizing value, has always taken first
-place among the volatile liquids used for thinning paints. Wood
-turpentines, produced from the steam distillation of fine-cut fat
-pinewood or from the destructive distillation of stumpage and sawdust,
-have been refined in some cases, by elimination of odor and toxic
-effects, to such purity that they are equally as good as the purest
-grades of gum turpentine, and their use is bound to increase in the
-paint industry.
-
-The painter and manufacturer have come to understand that certain
-grades of asphaltum and paraffine distillates are equally as
-satisfactory as turpentine for use in paints for exterior purposes.
-Those volatile oils which are distilled from crude oil with either
-a paraffine or asphaltum base and possessed of boiling point, flash
-point, color, and evaporative value approximating similar constants of
-turpentine, are excellently suited to partly, and in some cases wholly,
-replace turpentine in exterior paints. A little additional drier added
-to paints thinned with these materials will cause oxidation to take
-place in the proper time.
-
- * * * * *
-
-Prominent master painters[A] have shown that benzol, a product obtained
-from the distillation of coal tar, differing from benzine, a product
-obtained from the distillation of petroleum, is a valuable thinner to
-use in the reduction of paints for the priming of resinous lumber such
-as cypress and yellow pitch pine. The penetrating and solvent value of
-benzol is high, and it often furnishes a unison between paint and wood
-that is a prime foundation to subsequent coatings, preventing the usual
-scaling and sap exudations, which often appear on a painted surface.
-Because of the great solvent action of benzol, however, this material
-should never be used in the second and third coatings. These facts will
-doubtless interest the Southern painter, who has so much wood of a
-refractory nature to paint.
-
-[A] Dewar, Titzel _et al._
-
-
-_Oils_: The increasing cost of linseed oil has raised the interesting
-question as to whether or not it is good practice to use an admixture
-of other oils in connection with it, in high grade paint coatings.
-Strong differences of opinion will probably be found in regard to this
-question, and undoubtedly further investigation work is necessary in
-order to decide it. A number of different oils have been proposed for
-the purpose, of which, perhaps, soya bean oil is the one which has been
-most prominently discussed. No definite formulas, however, should be
-recommended until the results of investigations which are now being
-carried on are in hand. A systematic series of test panels is now
-being erected in Washington, D. C., on the grounds of The Institute of
-Industrial Research, which are designed to gather data covering just
-this point.
-
-The flax crop conditions have been most discouraging during the past
-two years, and the natural shortage of seed has caused a rise in the
-price of linseed oil, which has necessitated a rise in the price
-of paint. The added protection to be secured, however, through the
-frequent application of paint far outweighs any increased cost which
-has been caused by the rise in price of the raw commodities entering
-into the composition of paint.
-
- * * * * *
-
-
-
-
-
-
-
-
-
-End of the Project Gutenberg EBook of The Preservation of the Exterior of
-Wooden Buildings, by Allerton S. Cushman and Henry A. Gardner
-
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