Paneling and Siding

PANELING AND SIDING

Founded in 1911 by Antone V. Beronio, Beronio Lumber has supplied fine wood products to architects and builders for over ninety years. From its original yard on Powell and Beach Streets on San Francisco’s bustling waterfront, Beronio sold lumber, millwork and mouldings to the contractors busy rebuilding the city after the devastating earthquake and fire of 1906. It was these proud craftsmen who created the rich architectural heritage for which San Francisco is famous today.

From the beginning, Beronio Lumber has offered high quality wood paneling and siding. Over the years we’ve amassed a wide assortment of patterns and profiles. This catalog includes snapshots of some of the many patterns and profiles presently in inventory. While we’ve tried our best to show representative pieces, it’s impossible for just one piece to convey the full range and depth of the natural characteristics found in a particular wood species or lumber grade. Naturally, it’s best to come and see for yourself which species and grade best meet your needs.

Can’t find something in this catalog that meets your needs? No problem. We look forward to working with you to produce a custom pattern or profile.

All patterns are subject to change without notice. Please check with Beronio Lumber before making final choices. PANELING AND WAINSCOTING

4 Wood paneling enhances any décor. Whether it’s smooth, textured, patterned, stained, tinted, waxed or natural, real wood has a unique look and radiates a warmth unmatched by other interior finishes. With so many options to choose from, how do you decide? We recommend Rob Thallon’s Graphic Guide to Interior Details published by The Taunton Press as a good introduction to millwork in general and to paneling in particular. Or, you might try the Western Wood Products Association’s idea booklet Real Wood Interiors—A Design Workbook. A great source for specific installation details is the book and companion video Trim Carpentry Techniques by Craig Savage, also from The Taunton Press. These books and more are available at our Marin Street store.

Naturally, most wainscot patterns serve equally well when used as wall or ceiling paneling. PANELING AND WAINSCOTING

J3 1 x 4 J3-C 1 x 4 Douglas Fir Alaskan Yellow C/Btr VG Clear TG C Solid TG VG

3/4” Thick 3/4” Thick 3-1/8” Face 3-1/8” Face

J4-C 3/8 x 4 J4-C 3/8 x 4 Cherry Bead Cherry V Reversible TG

5/16” Thick 5/16” Thick 3-1/8” Face 3-1/8” Face PANELING AND WAINSCOTING

J4-G 3/8 x 4 J4-G 3/8 x 4 Genuine Mahogany Genuine Mahogany Bead V Reversible TG

5/16” Thick 5/16” Thick 3-1/8” Face 3-1/8” Face

J4-M 3/8 x 4 J4-M 3/8 x 4 Maple TG Maple Bead Side V Reversible TG

5/16” Thick 5/16” Thick 3-1/8” Face 3-1/8” Face PANELING AND WAINSCOTING

J4-R 3/8 x 4 J4-R 3/8 x 4 Red Oak Red Oak Flat Sawn Bead V Reversible TG

5/16” Thick 5/16” Thick 3-1/8” Face 3-1/8” Face

J5 1 x 4 J5 1 x 4 Douglas Fir Douglas Fir C Solid VG TG Single Bead Face Double Bead Back

9/16” Thick 9/16” Thick 3-1/8” Face 3-1/8” Face PANELING AND WAINSCOTING

J5J 1 x 4 J5J 1 x 4 House White House White TG Bead TG V-Side

9/16” Thick 9/16” Thick 3-1/8” Face 3-1/8” Face

J6C 1 x 4 J6C 1 x 4 Red Cedar Clear Heart Red Cedar Clear VG TG Beaded Heart TG V-Side

5/8” Thick 5/8” Thick 3-1/8” Face 3-1/8” Face PANELING AND WAINSCOTING

J6J 1 x 4 J6J 1 x 4 FJ Pine FJ Pine TG Bead TG Bead V-Side

5/8” Thick 5/8” Thick 3-1/4” Face 3-1/4” Face

J6K 1 x 4 J6K 1 x 4 Pine/Spruce Appearance Pine/Spruce Knotty TG Beaded TG Bead V-Side

11/16” Thick 11/16” Thick 3-1/8” Face 3-1/8” Face PANELING AND WAINSCOTING

J15-DF 1/2 x 4 J15-DF 1/2 x 4 Douglas Fir Douglas Fir B VG Resawn TG B VG V/Smooth SE TG

1/2” Thick 1/2” Thick 3-1/4” Face 3-1/4” Face

J16V 1/2 x 6 J20 1 x 8 Douglas Fir VG Alpine Knotty Smooth T&G Country Beaded TG

1/2” Thick 11/16” Thick 5-3/16” Face 6-3/4” Face PANELING AND WAINSCOTING

J21 1 x 6 J21 1 x 6 Alpine Knotty Pine V-Side Beaded TG

11/16” Thick 11/16” Thick 5” Face 5” Face

J23J 7/16 x 4 J24 1 x 6 Pine FJ Primed Douglas Fir B (10% C) Bead-Wall TG VG Clear Square Edge TG

13/32” Thick 3/4” Thick 3” Face 5-1/4” Face PANELING AND WAINSCOTING

J25 1 x 6 J29-J 3/4 x 6 Douglas Fir B (10% C) House White VG Clear “Eased Beaded TG Edge” TG Special Order

3/4” Thick 23/32” Thick 5-1/4” Face 5-1/8” Face

J29-J 3/4 x 6 J46 W 1 x 6 House White Red Cedar V-Side VG TG “Channel Reveal” Special Run

23/32” Thick 11/16” Thick 5-1/8” Face 4-7/8” Face PANELING AND WAINSCOTING

J46 DF 1 x 6 J47 4 x 8 Douglas Fir Arauco Clear Beaded Plywood C VG TG “Channel Reveal” 2” OC Smooth Plybead Special Run

11/16” Thick 5/16” Thick 4-7/8” Face 48” Wide Panel 2” Pattern Repeat

J48 4 x 8 J53 2 x 6 Victorian Beaded Plywood SPF Select Deck Knotty Unfinished TG V

3/16” Thick 1-7/16” Thick 48” Wide Panel 5” Face 1-9/16” Pattern Repeat PANELING AND WAINSCOTING

J54 4 x 8 J55 4 x 8 MDF Preprimed MDF Preprimed Nantucket Harbor Bead Bead 3" OC (1/4") 1-1/2" OC (1/4")

1/4” Thick 1/4” Thick 48” Wide Panel 48” Wide Panel 3” Pattern Repeat 1-1/2” Pattern Repeat

J2-12 1 x 12 J57 1/2 x 6 #1 Knotty Pine AZEK PVC Beaded TG Colonial Bead TG (18' Only) Special Order

11/16” Thick 1/2” Thick 10-5/8” Face 5-1/8” Face PANELING AND WAINSCOTING

J57 1/2 x 6 J58 2 x 6 AZEK PVC Beaded TG Douglas Fir Select Struct “V” (18' Only) V-Side Face / “SE” Back

1/2” Thick 1-7/16” Thick 5-1/8” Face 5” Face

J63 1 x 3 J63C 1 x 3 Douglas Fir C VG Red Cedar Clear “Screenwall” VG “Windscreen”

3/4” Thick 11/16” Thick 2-1/2” Face 2-1/2” Face (Not including gap) (Not including gap) PANELING AND WAINSCOTING

J74C 1 x 4 J74DF 1 x 4 Red Cedar Douglas Fir C VG Clear VG “Windscreen” “Screenwall”

11/16” Thick 3/4” Thick 3-1/2” Face 3-1/2” Face (Not including gap) (Not including gap)

J74K 1 x 4 W504 1 x 6 SPF Appearance Windsor One “Screenwall” Beaded Wainscot (SPBC6)

3/4” Thick 23/32” Thick 3-1/2” Face 5-1/8” Face (Not including gap) PANELING AND WAINSCOTING

W504 1 x 6 Windsor One Beaded Wainscot V-Side (SPBC6)

23/32” Thick 5-1/8” Face

17 SIDING

Wood has been used as siding for centuries. It provides weather protection Even if your design calls for something apart from the commonplace or and insulation in a wide range of siding types and patterns affording traditional, there are a few things to always keep in mind when selecting unlimited design possibilities. When properly installed and maintained, wood siding. Narrower patterns shrink and swell in width less than wider 18 wood siding will provide decades and decades of service. The ancient temples ones and thus are less likely to cup and split as the ambient environment of Japan, the 12th century stave churches of Norway, and the colonial cycles between wet and dry. Thicker patterns have less tendency to cup or houses of New England attest to the longevity of a well designed and split than thinner ones. Vertical grain siding is roughly twice as properly constructed wood building. dimensionally stable as flat grain siding, so it holds paint better and longer, and is much less likely to cup, split or exhibit raised grain. Clear grades of For best performance, it’s important to select a siding type and pattern that siding always outperform knotty grades. Bevel, Dolly Varden, and Channel is suited to your local climate. In addition to appearance, several things Rustic siding patterns allow for more dimensional change without adversely must be considered when determining the wood species, the lumber affecting siding appearance than do drop and tongue & groove patterns. grade and the siding pattern that’s best for your project. Will the building Most wood siding is installed horizontally. Vertically installed siding is a be subject to driving rain or to hot, dry winds? How wide are the roof special case that often warrants the use of higher grade siding and more overhangs? Will the siding be installed horizontally or vertically? What kind careful installation. All other things being equal, siding patterns that are of finish will be applied to the siding? narrower, thicker and made from clear, vertical grain lumber always While choosing the right siding may sound complex, a lot of it is just perform best. common sense. Wood has been the siding of choice in the United States for The performance of even the best grades of wood siding can be undermined over 300 years, so there are countless examples to be seen. Take a walk by improper installation and poor maintenance. Fortunately, there are around you own neighborhood. What siding types and patterns have several excellent guides that spell out how wood siding should be installed traditionally been used? Do they complement the buildings’ design? How and maintained to ensure best performance. We keep on hand for distribution are they holding up? The beautiful painted Victorian houses that grace the to customers copies of the Western Wood Products Association’s Natural Bay Area attest to the natural longevity of painted siding of redwood and Wood Siding Selection, Installation & Finishing and the California Redwood western red cedar. Association’s Siding Patterns and Applications. The Canadian Wood SIDING

Council’s Wood Reference Handbook is without equal as a general guide to and bottom to keep out insects. Used in the wetter regions of Europe with the use of wood in building construction. We stock and recommend The great success for more than 30 years, rain screen siding is gaining Builder’s Guide to Mixed Climates by Joseph Lstiburek. acceptance in North America. Installation details can be found in ‘Rain- 19 Screen Walls: a Better Way to Install Siding’ in the February/March 2001 Poor performance of siding is most often caused by building design flaws, issue of The Taunton Press’ Fine Homebuilding Magazine. improper installation, and inadequate maintenance. Compared to the traditional “energy wasters,” today’s energy-efficient houses present a particular challenge to the performance of wood siding. The main *Western red cedar, redwood, and Alaskan yellow cedar are rich in natural organic compounds difference is that the walls of older houses are leaky, warm and forgiving called extractives. These compounds impart to these woods their color, aroma and decay resistance. Sometimes, when these woods get wet, the extractives migrate to the surface and of getting wet, while those of new houses are tight, cold and unforgiving. cause discoloration. These spots are natural, unavoidable, and tend to lessen in intensity over The result is that wood siding on new houses that gets wet stays wet time. longer and often accumulates enough moisture to cause problems such as extractive staining*, mildew and peeling paint.

These and other moisture-caused problems in wood siding can be avoided by installing siding according to the rain screen principle. Traditionally, wood siding is installed directly over sheathing and housewrap, with no gap between the two. With the rain screen principle, siding is installed on furring strips or over a 3-dimensional plastic mesh to create an air space between siding and sheathing and housewrap. The air space allows water vapor to escape from the rear of the siding as well as from its face. "Rain screen" siding dries quickly after getting wet, so it doesn’t stay wet long enough for problems to arise. Furring strips, which are about 1/4 inch thick, are located over framing members. The air space is screened at the top NATURAL LUMBER SIDING AND SOFFIT

K31 1 x 8 K31 1 x 8 Redwood Select Heart Redwood Select Heart Smooth Face Sawtex Face

11/16” Thick 11/16” Thick 7” Face 7” Face

K33 1 x 6 K33 1 x 6 Redwood Select Heart Redwood Select Heart Sawtex Face TG Smooth Face V-Side

11/16” Thick 11/16” Thick 5” Face 5” Face NATURAL LUMBER SIDING AND SOFFIT

K40V 5/8 x 4 K40V 5/8 x 4 Western Red Cedar Clear Western Red Cedar Clear Heart (10% B) Vertical Grain Heart (10% B) S TG Smooth V Sawtex Face TG Face

5/8” Thick 5/8” Thick 3-1/2” Face 3-1/2” Face

K42V 1 x 6 K42V 1 x 6 Western Red Cedar Clear Western Red Cedar Clear Heart (10% B) Vertical Grain Heart (10% B) Vertical Grain Sawtex Face TG Smooth V Face

3/4” Thick 3/4” Thick 5-1/4” Face 5-1/4” Face NATURAL LUMBER SIDING AND SOFFIT

K50V 3/4 x 6 K55V 1/2 x 4 Western Red Cedar Clear Redwood Clear Heart VG Sawtex Bevel VG Resawn SE TG Special Order

11/16” Thick 7/16” Thick 5” Face 3-1/4” Face

K55V 1/2 x 4 K58V 1 x 6 Redwood Clear Heart Redwood Clear Heart VG Resawn SE Smooth V TG VG R/S TG (11/16” Net) Special Order Resawn Special Order

1/2” Thick 11/16” Thick 3-1/4” Face 5-1/8” Face NATURAL LUMBER SIDING AND SOFFIT

K58V 1 x 6 K59 1 x 6 Redwood Clear Heart Western Red Cedar VG R/S TG (11/16” Net) Tight Knot TG Resawn Side Smooth Special Order

11/16” Thick 11/16” Thick 5-1/8” Face 5-1/8” Face

K59 1 x 6 Western Red Cedar Tight Knot TG Smooth Side

11/16” Thick 5-1/8” Face PRIMED HOUSE RED SIDINGS

24 The patterns featured here are those most commonly used in the Bay Area over the past 150 years. Found on everything from elegant Victorians to the sidewalls of refined buildings of the 1920’s and 30’s in such areas as Piedmont, Pacific Heights, and St. Francis Woods, they provide the ideal means of cladding a building in harmony with the neighborhood’s existing architectural style.

The bulk of the details are stocked in premium quality fingerjointed western red cedar or redwood. The sidings contain a large percentage of vertical grain stock for maximum dimensional stability and better overall performance. Unless otherwise noted, each board is finished on all sides with two coats of a premium stain-blocking primer that improves topcoat performance. The combination of predominantly vertical grain and the two coats of primer greatly minimizes the chance of grain raising and extractive staining. PRIMED HOUSE RED SIDINGS

K1-8J 1 x 8 K1-10J 1 x 10 House Reds House Reds VG FJ-EG Primed “Cove” VG FJ-EG Primed “Cove”

11/16” Thick 11/16” Thick 7” Exposed Face 9” Exposed Face

K4-6J 1 x 6 K4-8J 1 x 8 House Reds House Reds VG FJ-EG Primed “V” VG FJ-EG Primed “V”

11/16” Thick 11/16” Thick 5” Face 7” Exposed Face PRIMED HOUSE RED SIDINGS

K4-10J 1 x 10 K5-8J 1 x 8 House Reds House Reds VG FJ-EG Primed “V” Primed Siding Channel Rustic

11/16” Thick 11/16” Thick 9” Exposed Face 7” Exposed Face

K5-10J 1 x 10 K6J 1 x 10 House Reds House Reds VG FJ-EG Primed “Channel” VG FJ-EG Primed “Triple Lap”

11/16” Thick 11/16” Thick 9” Exposed Face 9” Exposed Face PRIMED HOUSE RED SIDINGS

K9-SJ 7/8 x 8 K10-SJ 7/8 x 10 House Reds House Reds FJ/EG VG (10% FG Dev) FJ/EG VG (10% FG Dev) Smooth Bevel Smooth Bevel

7/8” Thick 7/8” Thick 7” Exposed Face 9” Exposed Face

K14C 1/2 x 6 K45J 1 x 4 House Reds House Reds FJ/EG VG FJ VG “Clapboard” Bevel “Belgium Shiplap” SE Acrylic Primed

1/2” Thick 11/16” Thick 4-1/2” Exposed Face 3-3/16” Exposed Face

CEDAR SHINGLES

Wood shingles have a special warmth and elegance and a classic architectural parallel joints between shingles are desired, our KS 14 Rebutted and 29 look that speaks of quality, taste, and timelessness. No other cladding Rejointed shingles are an ideal choice. All sides and ends of R&R shingles offers nature’s own formula for unrivaled, weather-defying protection and are machine trimmed to have parallel edges that meet at 90 degrees. The insulation that ensures that your investment will last and last. We stock faces have been sanded smooth, providing an ideal surface for finishing. Stave Lake #1 Blue Certi-Label™ shingles in both Western Red Cedar and Five-X R&R’s are available in both Red Cedar and Alaskan Yellow Cedar for Alaskan Yellow Cedar. All of our shingles are 100% heartwood, 100% clear, those who prefer a lighter colored shingle. We also stock 18” perfections and 100% vertical grain. Beronio is proud to be an associate member of the for those jobs where a larger scale is preferred. Cedar Shake & Shingle Bureau and supports the bureau’s dedication to We stock Fanci-Butt red cedar shingles in all of the popular designs. rigorous quality control and technical support. Shingle selection, installation, Whether you’re looking for Fishscale, Round, Diagonal, Arrow, Diamond, finishing details, and other information is available at www.cedarbureau.org. Half-Cove, Hexagonal, Octagonal, or Square, we have the profile in stock We inventory a wide array of shingles. The most popular is the standard, that makes your project unique. unseasoned KS 10 16” (Five-X) sidewall shingle, which has an A-grade face and butt. 16” Five-X shingles are 2/5 of an inch thick at the butt and are typically installed with 5” of wood exposed to weather. Where tight-fitting, CEDAR SHINGLES

KSP 1 Shakertown KS 10 Shingle Panel 16” Red Cedar Unseasoned “A” Butt

8-1/4” x 96” Panel 7” Exposed Face

KS 10D Bundle Dipped KS 13 Special Order 16” KD Red Cedar Stave Lake, Fire Treated Special Order CEDAR SHINGLES

KS 14 KS 18D Red Cedar 16” Red Cedar KD Rebutt/Rejointed Sanded Rebutt/Rejointed Face Sanded Factory Sealed with Cabot Clear Oil Special Order

KS 99 R&R also available as 18” Perfections Rebutt/Rejointed Sanded FSC Certified Special Order

Look for FSC-marked products

KS 16 KS 30 16” KD Red Cedar 16” Alaskan Yellow Cedar 1 Coat Cabot VG R&R's Bleach/Weather Stain Special Order Special Order

Note: Shown aged 6 months Southern Exposure PLYWOOD SIDING

32 Versatile, economical, and relatively easy to install, plywood siding has been used for decades. We proudly stock K-Ply’s Western Red Cedar plywood siding and Roseburg Forest Products’ Breckenridge plywood siding.

K-Ply panels feature a naturally durable western red cedar face and back. Our stock grade is 303:18S which allows up to 18 small solid knots and/or knot holes that have been filled with a cedar-toned filler. Panels with clear faces are available on a special order basis. Beronio Lumber also carries K- Ply’s unique Panel 4 which features a face composed of 4-inch-wide clear red cedar strips. Panel 4 offers the look of 1 x 4 T&G lumber siding with the installation ease of plywood.

Breckenridge is Roseburg Forest Products’ premium grade plywood siding. Produced from selected face veneers with specific grain characteristics, it stands apart from typical Douglas Fir plywood siding. The carefully selected faces create a dimensionally stable panel that has no major visual distinction between sapwood and heartwood, resulting in a more uniform grain that enhances the appearance and longevity of applied finishes. For best performance, Roseburg recommends that the siding be finished with a solid color acrylic coating. Among all of the wood-base sidings, plywood siding is the most maintenance-intensive. PLYWOOD SIDING

KPB KPB-8 19/32” Breckenridge™ Hardwood Plain 19/32” Breckenridge™ Hardwood 8” Face SL Groove SL KPB-3 11/32”

KPC-3 KPC8-5 11/32” Red Cedar Select Knotty Grade 19/32” Red Cedar Select Knotty Grade Plain SL 8” Groove KPC-5 19/32” Red Cedar Select Knotty Grade Plain SL

HARDIPLANK

Hardiplank is a new lap siding product that combines the durability 35 of fiber-cement with the look of wood. Manufactured from Portland cement, sand and wood fiber, the siding is durable, economical, and comes factory-primed. Hardiplank will not rot, is immune to permanent water damage, is not attacked by insects, holds paint extremely well, carries a Class A fire rating and is backed by a 50-year limited transferable warranty when installed in accordance with the manufacturer’s instructions. While no synthetic siding is an exact match for traditional wood siding, James Hardie’s textured products harmonize with traditional architecture.

Sold in panels, James Hardie’s Shingleside combines the look of an authentic wood shingle with the ease of panel installation. Shingleside is backed by a limited 30-year warranty. Unfortunately, factory-priming is not yet available for Shingleside.

Information on the entire line of James Hardie siding products, as well as installation and finishing instructions can be found at www.jameshardie.com. PRIMED FIBER - CEMENT SIDINGS

KH-9 KH-8C 9-1/4” Hardiplank Smooth 8” Hardiplank Factory Primed Preprimed Smooth Lap Colonial Lap

5/16” Thick 5/16” Thick 8” Exposed Face 6-3/4” Exposed Face

KH-8CR KH-8 8” Hardiplank Primed Colonial 8-1/4” Hardiplank Smooth Rough Sawn Preprimed Smooth Lap

5/16” Thick 5/16” Thick 6-3/4” Exposed Face 7” Exposed Face PRIMED FIBER - CEMENT SIDINGS

KG-1 GAF Weatherside Fiber Cement Shingle

12” x 24” 11” Exposed Face

37 FINISHES FOR WOOD SIDING

Selecting the right finish for your wood siding is critical to maintaining equal, coatings last longest on a building’s northern exposure and on 38 its appearance and performance over time. For information beyond those parts of a building that are sheltered from rain. what is presented in this primer on finish types, we recommend The Finishes can be applied to new wood siding in a factory or on site. Forest Products Society's Finishes for Exterior Wood as an excellent Because of its many advantages, factory-finishing of siding is fast overall guide. becoming the norm. Here, all sides of every piece of siding—face, back, Paints, solid-color stains, clear coatings, water repellents, and edges, and ends—are machine-coated with a primer and, if desired, with semitransparent stains are applied to wood siding to enhance its one or more topcoats. Because the siding arrives at the jobsite already appearance and to protect it from the elements. These and other finishes backprimed and topcoated, field finishing costs are reduced or eliminated, are classified as either film-forming or penetrating. Both types can be and the siding has instant protection from the elements. Site-cut edges either water-borne (also known as latex) or oil-base. Upon drying, film- and ends, of course, must be re-primed before siding is installed. forming finishes—primers, paints, solid-color stains, and clear Likewise, the back, edges, and ends of new bare wood siding that will be coatings—coalesce into a thin continuous sheet that sits on top of the finished in the field should be primed before siding is installed. The face wood. Of all coating types, film-forming finishes provide the greatest should be primed within two weeks of the siding being installed, protection to wood by virtue of the physical barrier they pose to the otherwise it will have to be lightly sanded to remove contaminants and to elements. Penetrating finishes, on the other hand, do not form surface reactivate the wood for good adhesion. Such surface preparation is, of films, but rather are absorbed into the wood. Water repellents and course, not possible with roughsawn siding. Best adhesion is achieved on semitransparent stains fall into this category. Effective in controlling both smooth and rough siding when finishes are worked into surface surface checking, penetrating finishes do not stop wood from weathering. irregularities by brushing. Finishes applied on-site by spraying or rolling should be back-brushed for this reason. The type of finish, the properties of the wood to which it is applied, local climate, and directional exposure influence the performance and FILM-FORMING FINISHES longevity of coatings applied to exterior wood products. All other things PRIMERS—Applied to bare wood in advance of paints and solid-color being equal, paints last longest, followed closely by solid-color stains, stains, a primer creates a smooth base for the topcoat to adhere to, and with semitransparent stains, water repellents, and clear coatings all serves as a chemical barrier between the wood and the topcoat. Best about an equally distant third. All other things being equal, finishes last performance is obtained with a primer that contains a fungicide to stop longest on vertical grained surfaces of low density softwoods whose mildew and a stain-blocker that prevents water-soluble extractives in moisture content stays below about 16 percent. All other things being wood from discoloring topcoats. CLEAR COATINGS—Essentially paints without pigment, varnishes, urethanes, and other clear coatings require frequent maintenance. The sun’s ultraviolet rays pass through these transparent finishes and slowly degrade the wood. In usually two years or less, even the toughest clear finishes often crack and peel. Additives that block or absorb ultraviolet light slightly lengthen the service life of clear coatings. Best performance is obtained by applying a “paintable” water repellent to the bare wood, followed by three or more coats of finish.

PENETRATING FINISHES

WATER REPELLENTS—Used on exterior wood that is otherwise unfinished, water repellents retard absorption of liquid water by wood, causing dew, rain, and snow melt to bead on the surface where it can harmlessly evaporate. Effective in limiting warping, surface checking, and end splitting, these penetrating finishes do not prevent wood from turning gray. Most water repellents are oil-based; some contain a fungicide to discourage mildew. Applied liberally by brushing or spraying, water repellents are readily absorbed into smooth and rough wood. Because water repellents applied to otherwise unfinished wood remain effective for only 1 or 2 years, they must be reapplied regularly. So-called “paintable” water repellents are applied directly to bare wood before the primer to enhance the performance and longevity of paints and solid-color stains by reducing extractive staining, and blistering and peeling. PAINTS—Paints are opaque coatings that, in addition to their decorative SEMITRANSPARENT STAINS—An excellent choice for roughsawn or 39 function, protect wood by blocking the sun’s ultraviolet rays, repelling weathered wood, semitransparent stains impart color to wood without liquid water, retarding the absorption of water vapor, and preventing hiding its natural texture. If used on new smooth wood, only a single coat erosion. For each wet coat applied, a dry film 2 or 3 mils thick (1 mil of semitransparent stain should be applied initially. Otherwise, a film may equals 0.001 inches) is left behind. Oil-base paints generally have lower form; surfaces may appear glossy and later begin to flake because of permeability to water vapor and are less flexible over time than water- smooth wood’s inability to absorb the second coat. Additional coats can borne paints. As a consequence, oil-base paints are more susceptible to be applied once smooth surfaces have become more absorptive after cracking and peeling occasioned by swelling and shrinking of the weathering for 1 or 2 years. Semitransparent stains provide to wood only underlying wood. Performance and longevity of paints can be enhanced slightly more protection from the elements than water repellents. by treating bare wood with a “paintable” water repellent prior to priming. Reapplication is usually necessary every 3 to 4 years. Paint’s best performance is obtained when two topcoats of 100 percent acrylic latex paint with fungicide are applied over a primer containing fungicide and stain-blocker. Depending on local climate and severity of exposure, such a system should give 7 to 10 years of good performance before refinishing is needed.

SOLID-COLOR STAINS—Solid-color stains are essentially thin paints, with a one-coat dry film thickness of about 1 mil. The thinness of the film permits both liquid water and water vapor to pass more easily into and out of the wood. Though some solid-color stains can be applied directly to bare wood, most benefit from being applied over a compatible primer containing fungicide and stain-blocker. Application of a “paintable” water repellent prior to priming further improves performance and longevity. As with paints, best performance is achieved with a three-coat system of primer containing fungicide and stain-blocker and two top coats of 100 percent acrylic latex solid-color stain with fungicide. Depending on the environment, this system should give 3 to 7 years of satisfactory service before maintenance is required. SIDING: INSTALLATION DETAILS

A rainscreen installation uses furring strips, or breather mesh, to maintain an air space behind the siding. The air gap provides improved drainage, better drying, reduces the chance of rot, increases the service life of the coating system, and is generally much easier on the siding by allowing it to “breathe.” The technique was first developed in the wet climates of Northern Europe and Canada in an effort to help accomodate siding problems caused by modern “air-tight” construction. The results have been dramatic. Now, the “rainscreen” system is beginning to gain acceptance in North America. We do not have the training to design entire systems. The panels depicted here are presented to show how the system works in principle, and are not intended as specific designs. The Building Science Corporation (www.buildingscience.com) contains a wealth of information regarding “rainscreen” design and is a great source for more specific details.

40 Shingle Board Showing Edge Profile of Above Panel Construction Rainscreen with siding and 3/8” ply furring “Home Slicker” strips NOTES 2525 MARIN STREET SAN FRANCISCO, CA 94124 TEL: 415-824-4300 FAX: 415-824-3706 WWW.BERONIO.COM