vex/' Vitifit.rf xt-Jiwi .v.w* PAGE 19 - PLAINDEALER - FRIDAY, MARCH 18.1983 I H M A FREE BROCHURE ENTITLED "HOW TO GET A GOOD SIDING JOB" is available from Alcoa Building Products, Inc. Experts answer frequently-asked questions about aluminum siding is Your Home Really covered? For nearly a quarter cen tury, Alcoa Building Products has been manufacturing high quality, low maintenance alu minum siding for America's homes. So it's not surprising that when homeowners have a question about their aluminum siding they turn to Alcoa for the answers. Recently, Charles Gindele, a staff engineer and consumer advisor at Alcoa, provided an swers to the questions home owners ask most often about aluminum siding. There's a fine dust or "chalk" on my siding. What causes this and is it normal? Oxidation, or "chalking," is a normal process whereby the pigment in siding gradu ally breaks down and releases microscopic particles. Siding is designed to oxidize very gradually so, if your siding "chalks" too quickly, you may want to check with your contractor. Oxidation is generally first noticed as a lightening in the color of the house, or when, in brushing against the house, one notices a fine dust on the hands or clothing. There's no way to prevent oxidation--it's a self-cleaning feature of the siding. Homeowners who have older siding can sometimes wash off the chalk and return the siding to its original color. Anyone just having his house sided should be aware that the color will change slightly over the years as the siding oxidizes. Is siding a good insulator? Even an uninsulated siding panel cuts down on air infiltra tion through cracks, around doorways and windows and in cornerboards. The air space created by applying an uninsu lated siding panel over a wall has an "R " value of about .75. (New home insulation stan dards in the north are R-19 for sidewalls, R-30 for attic ceil ings.) While .75 is not that high, it is a contribution to ward saving energy. Insulated siding panels have an "R" value of between 2 and 3. In addition, homeowners can select from a wide variety of sheathing products, which can be applied under siding, or can have stud spaces blown with an insulating material if the siding is going over wood clapboard. Insulated siding is usually a wise investment as the addi tional cost may be recovered in reduced energy usage. If / just moved into an alu minum sided home that needs a panel replaced, how can / tell the brand? If you don't know the name of the contractor who applied the siding, you may be able to make some observations that will help you determine the brand. For example: • While most manufactur ers make a woodgrain siding, the grains vary from brand to brand and you should be able to tell one from another. • On a smooth, eight-inch wide siding panel, check the thickness of the butt (bottom) edge; it will vary from % to % inch between brands. • A drip bead that deflects water off the surface is a dis tinguishing factor. It's gener ally located on the face of the panel, at the bottom, where it meets the butt edge. • Weep holes (most siding panels have them on the butt edge) are small openings that allow moisture to escape from behind siding. They vary in size and shape (round, trian gular, slotted) from brand to brand. They're also spaced differently--Alcoa, for exam ple, has round weep holes every 18 inches. • As a last resort, pry loose a small siding section and look at the color of the protective "wash coat" on the back; also look for a small logo on the back or on the top nailing hem. Can / repaint my alumi num siding? Yes--just be sure to prepare the surface for repainting by cleaning it of dirt and oxida tion. Any good exterior paint, preferably latex, will do. There's usually no need for sanding or priming. If chang ing color, you may need two coats. Though siding is a low- maintenance product, is there something / should do to main tain it? It's a good practice to wash down the siding with a deter gent solution ('/> cup detergent to three quarts water) once a year. This reduces the possi bility of mildew, enhances the appearance and prevents oxi dation from staining any nearby brick. A soft brush or sponge should be used to re move any dirt or mildew pres ent. Do you have any questions about aluminum siding? Alcoa will do its best to answer them. Write for more information to Alcoa Building Products, Inc., Two Allegheny Center, Pittsburgh, PA 152J2 and ask for the free brochure, "How To Get A Good Siding Job." rent soft\ PER MO. 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