Board and batten siding (C) Daniel Friedman Guide to Wood Siding: Choices, Installation, Maintenance
     


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Wood siding materials, wood types, grades, moisture content, profile images: this article discusses choices of wood siding materials for buildings: shingles, clapboards, and wood product grades and appearance profiles.

This article series discusses best practices construction details for building exteriors, including water and air barriers, building flashing products & installation, wood siding material choices & installation, vinyl siding, stucco exteriors, building trim, exterior caulks and sealants, exterior building adhesives, and choices and application of exterior finishes on buildings: paints, stains.

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Guide to Wood Siding Products on buildings: Choices, Installation, Maintenance

Suffolk Resolves House (C) Daniel FriedmanAdapted/paraphrased with permission from Best Practices Guide to Residential Construction. Steven Bliss.

Solid wood siding materials (clapboards, drop-leaf or novelty siding, wood shingles, vertical wood siding, board and batten, etc.) have been used for hundreds of years and remain popular in many sections of the United States and other countries despite their need for regular refinishing.

Our photo of a wood clapboard-sided home (left) shows the Daniel Vose house, referred to historically as the Suffolk Resolves historic home (1774) relocated to Milton MA.

[Click to enlarge any image]

(More about this building is at ARCHITECTURE & BUILDING COMPONENT ID.)

Article Contents

In the Northeastern U.S., the most popular wood siding profile remains a simple bevel siding, or “clapboard.” In the western states, heavier profiles such as channel rustic are more common.

Plywood building siding products such as "T-111" grooved siding products installed in 4' x 8' sheets has been widely used throughout the U.S. since the 1970's.

Examples of Wood Siding Products & Materials - Board & Batten Siding; Clapboard Siding

Board and batten siding (C) Daniel Friedman Board and batten siding (C) Daniel Friedman

Above left, traditional board and batten siding (Pleasant Valley, NY) traditionally used on barns. Battens are nailed over gaps between vertical board siding, taking care to nail only on one side to avoid splitting.

Above right: wood clapboards installed rough-side out for a more rustic look and one that according to some, may provide better paint adhesion. See PAINT FALURE, DIAGNOSIS, CURE, PREVENTION

Board and batten siding (C) Daniel Friedman Short clapboard siding on an expanded but antique barn in Herefordshire, England, UK (C) Daniel Friedman

Above left, 1960's vintage aluminum siding installed over pre-1900 wood clapboard siding in a New York Home in the U.S.

At above right [click to enlarge] is an interesting use of wood clapboards on an antique barn in Herefordshire, England in the U.K. These clapboards are nailed to the interior side of vertical rough-hewn barn beams supporting the wall structure. You can see that the original barn was expanded on its right side using concrete blocks.

Plywood & T111 Siding

T-111 siding photo (C) Carson Dunlop Associates Plywood T111 type grooved siding (C) Daniel Friedman

Our closeup of T-111 type plywood siding (left) is provided courtesy of Carson Dunlop Associates.

At above right we show weathered plywood grooved siding (popularly called "T-111") on a 1980 constructed addition that by 2000 showed uneven weathering.

At Building Sheathing Wrap - House Wrap Installation, Purposes, Guide is a photo of this same building addition under construction twenty years previously.

Hardboard Siding: Abatibi, Boise Cascade, JamesHardie, HardiePlank,

Board and batten siding (C) Daniel Friedman Board and batten siding (C) Daniel Friedman

Above left, Masonite-type wood product siding: hardboard. Above-right HardiePlank wood siding with some peeling stain concerns. Details are at JamesHardie HardiePlank Siding. Also see

SIDING HARDBOARD
  Abatibi Siding Claims
  Boise Cascade Siding Claims
  JamesHardie HardiePlank Siding
  Masonite Siding Claims

Wood Shingle Siding Types

Board and batten siding (C) Daniel Friedman Board and batten siding (C) Daniel Friedman

Above left, wood shingle siding, Two Harbors MN. At above right this 1960's ranch home in New York was sided with brushed cedar shingle siding.

Wood Species Choices for Wood Siding: properties of cypress, red cedar, redwood, pine, spruce siding/shingles

Brushed cedar shingles (C) Carson Dunlop AssociatesRed cedar remains the wood siding material of choice due to the natural decay resistance of the heartwood and its attractive appearance when stained or finished clear.

Other decay-resistant woods are popular in the regions where they are produced: for example, redwood on the West Coast and cypress in the Southeast and Gulf Coast.

On projects where premium wood species are not affordable, builders also use a wide variety of softwoods, including pine and spruce, which are not naturally resistant to decay.

While most suppliers of wood siding now recommend back-priming and priming of cut ends, these details are even more critical with the less decay-resistant species.

Our photograph of brushed wood cedar shingle siding (above) on a Canadian home was provided by Carson Dunlop Associates.

Grading Methods for Wood Siding Products

Since wood siding is a nonstructural application, grading is generally for appearance only and is not governed by building codes. Most western species used for siding are graded according to one of the established grading agencies such as the Western Wood Products Association (WWPA). Still, manufacturers are free to name the grades as they choose for marketing purposes.

So one company’s “Select” grade may be quite different from another’s. For this reason, it is best to examine the material before specifying or purchasing.

Premium Grades of Wood Siding

Western woods are generally labeled either premium or knotty grades. Premium grades have more heartwood and fewer defects and are typically kiln dried.

The highest grades of cedar are typically

  • Clear VG (vertical grain)
  • Heart and
  • Clear Heart.

Premium grades for other western woods include

  • C Select,
  • D Select,
  • Superior, and
  • Prime.

Knotty Grades of Wood Siding

In general, “sound tight knots” or “select tight knots” (STK) indicates that there are no knots that will come loose or affect the performance of the siding.

Other common designations are Select Knotty, Quality Knotty, 2 & Better Common, 3 & Better Common, and NPS (no prior selection).

Since there are no uniform standards for these designations, an inspection of the material is important.

Moisture Content Targets for Wood Siding on buildings

Ideally, the siding should be installed at close to its equilibrium moisture content for the local climate (see Table 1-2 below). In general, unseasoned or green wood is shipped with a moisture content of greater than 19%. Air-dried or kiln-dried siding is shipped with a moisture content of 15 to 19%. In western woods, dry has a different meaning for premium and knotty grades.

Table of wood moisture content targets (C) Wiley and Sons - S Bliss

[Click to enlarge any image]

In premium wood siding grades, dry means that the siding has no more than 15% moisture content. In knotty grades, dry means that the moisture content does not exceed 19%. Dry siding stored on the site (stickered if possible) will usually acclimate to local conditions in a week to 10 days. Unseasoned wood may need 30 days or longer to acclimate.

Wood siding profiles (C) Wiley and Sons - S BlissImages of Wood Siding Profiles: Bevel, Rabbeted Bevel, Shiplap, Tongue & Groove, Channel Rustic,Board & Batten

Because horizontal profiles naturally shed water, they resist water leakage better than vertical profiles.

Also vertical wood siding is prone to wick up moisture from the bottoms of the boards, particularly where there is snow buildup or splashback.

Diagonal siding is the most prone to leakage since water is conducted down the joints to window headers and other possible entry points. The most common profiles with typical installation details are shown in Figure 1-7 above.

[Click to enlarge any image]

-- Adapted with permission from Best Practices Guide to Residential Construction

 

Continue reading at WOOD SIDING INSTALLATION or select a topic from the More Reading links shown below.

Also see SIDING WOOD, FAILURES OVER FOAM BOARD.

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SIDING, WOOD PRODUCT CHOICES at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.

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