シップラップ計算機
複数壁対応、実効重ね幅計算、目地幅調整、釘本数算出、2D割付プレビューを備えた高精度木材積算ツール。
1 壁の寸法
ヤード・ポンド法 (フィート/インチ)2 開口部と窓・ドアの控除
余分な木材発注を防ぐため、ドアや窓の面積を差し引きます。
No openings added. (Full wall area calculated)
3 板の規格と目地形状
4 張り方向・下地間隔・ロス率
必要材料の見積もり
*Planning Disclaimer: Fastener counts, adhesive tubes, and cost estimates are rules of thumb for planning purposes. Verify exact counts and local building codes prior to purchasing.
シップラップとは？重なり代が重要な理由
本物のシップラップ（相欠き羽目板）は、両端に段差加工が施された板です。下段の段差に上段の板を重ねることで、防水性と美しい陰影ラインを作り出します。
約13mm（0.5インチ）の重ね代があるため、壁に仕上がる有効幅は板の全幅よりも狭くなります。
Stainable, natural grain, interior accent walls
Ultra-smooth, zero knots, budget painted walls
Moisture & rot resistant, siding & baths
100% waterproof for showers & wet siding
断面・重ね代シミュレーター
シップラップの必要枚数計算 5ステップ
プロが実践する5つのステップ。各ステップをクリックすると詳細な計算式と図解が表示されます。
Measure Gross Wall Dimensions
Measure the total width and height of each wall in feet and inches. Multiply Width × Height to establish the total gross square footage before deductions.
設置場所別の施工ガイドと注意事項
部屋を選択して、防火基準、湿気対策、必要な金物規格をご確認ください。
Fireplace Accent Walls & TV Surrounds
National Fire Protection Association (NFPA 211) mandates a minimum 6-inch non-combustible setback (stone, tile, or cement backerboard) between the fireplace firebox opening and combustible wood shiplap. For gas or electric fireplaces, consult manufacturer zero-clearance specs before installing.
呼称寸法（規格）と実寸法の比較表
木材は製材前の寸法で呼ばれます。断面図をクリックすると有効寸法を確認できます。
5⅜" Actual Width • 4⅞" Exposed Face
Planed down to 5.375" actual width. The ½" rabbet joint reduces exposure to 4.875", creating the benchmark American farmhouse look.
| Nominal Size | Actual Width | Overlap | Exposed Face | Coverage (8ft) | Boards / 100 sq ft | Best Application |
|---|---|---|---|---|---|---|
| 1×4 | 3.500" | 0.500" | 3.000" | 2.00 sq ft | 50 | Wainscoting, mudrooms, compact bathrooms |
| 1×6 | 5.375" | 0.500" | 4.875" | 3.25 sq ft | 31 | Standard accent walls, fireplaces, most popular |
| 1×8 | 7.250" | 0.500" | 6.750" | 4.50 sq ft | 23 | High ceilings (9ft–12ft), master bedrooms, exteriors |
| 1×10 | 9.250" | 0.500" | 8.750" | 5.83 sq ft | 18 | Grand open living rooms, barn conversions, rustic |
| 1×12 | 11.250" | 0.500" | 10.750" | 7.17 sq ft | 14 | Two-story foyers, commercial lobbies, modern wide-plank |
釘の長さと下地への打ち込み深さシミュレーター
板の反りを防ぐため、下地の間柱へ25mm以上の留め付け深さが推奨されます。
Adjust Framing & Fastener Length
Finish Nails
Optimal holding strength for solid wood planks without splitting thin tongue profiles.
Brad Nails
Leaves tiny holes for quick wood filler touch-up. Always combine with construction adhesive.
304 / 316 Fasteners
Mandatory for outdoor shiplap and cedar siding to prevent black tannin rust staining.
Worked Example: 12' × 8' Wall with 2 Windows
Here is the exact mathematical step-by-step trace our calculator performs so you can verify the results by hand.
Given Parameters:
材質別価格と施工費用の目安
樹種によって費用は大きく異なります。シミュレーターで予算を試算してください。
Calculate Total Room Budget
| Wood Species / Material | Material ($/sq ft) | 100 sq ft DIY | 100 sq ft Installed | Recommended Usage |
|---|---|---|---|---|
| Primed MDF Shiplap | $1.50 – $2.25 | $200 – $275 | $450 – $675 | Interior painted accent walls, budget remodels |
| Pine / SPF (Knotty) | $2.20 – $3.50 | $270 – $400 | $520 – $800 | Rustic stained walls, farmhouse look |
| Poplar / Select Pine | $3.75 – $5.00 | $425 – $550 | $675 – $950 | High-end smooth painted finishes, zero knot bleed |
| Western Red Cedar | $5.50 – $8.50 | $600 – $900 | $850 – $1,300 | Exterior siding, bathrooms, covered porches |
| Cellular PVC / Composite | $5.00 – $7.50 | $550 – $800 | $800 – $1,200 | 100% waterproof exterior, zero maintenance |
| Reclaimed Barn Wood | $8.00 – $14.00 | $850 – $1,450 | $1,100 – $1,850 | Authentic rustic texture, vintage character |
端材ロスと束単位切り上げシミュレーター
間柱ピッチに満たない端材が再利用できない理由と、最適な予備枚数の求め方を解説します。
Simulate Board Cuts on 16" Studs
Simple Rectangular Walls
Standard interior accent walls with 1 or zero openings only generate 5–8% real offcut waste. Adding a 10% factor ensures you have spare boards to cull knot defects.
Ceilings, Bathrooms & Siding
Ceilings and walls with multiple windows require frequent end cuts around trim and light fixtures. An extra 15% allowance prevents mid-project supply runs.
Diagonal & Herringbone
Diagonal 45-degree installations create triangular cutoffs at every wall edge. Triangular offcuts cannot be flipped over because the rabbet groove face is reversed.
16" Stud Span Rule
Offcuts shorter than 16 inches cannot span across two wall framing studs and must be discarded as scrap.
Retail Pack Rounding
Shiplap is sold in 6-board bundles. Always round up to full bundles to avoid lot-matching color variations.
Natural Lumber Culling
Real wood bundles contain 3–5% bowed planks or loose knot holes that should be culled before installation.
カラーシミュレーターとコーキング施工基準
人気カラーを試着し、割れを防ぐためのコーキング推奨箇所を確認してください。
Select Finish & Color
Best all-round designer finish. Provides clean shadow gap contrast with easy wipe-down durability.
Pre-Paint Tongue Lips
Always prime and paint rabbet grooves before nailing. Prevents unpainted wood strips from appearing during winter wood shrinkage.
Knot Bleed Sealer
Apply a shellac-based primer over pine knot clusters to prevent yellow resin tannin bleed-through on white paint.
Satin Sheen Advantage
Satin enamel balances soft architectural shadow lines with wipe-down washability for long-term durability.
シップラップ vs 目地あき vs 本実 vs 押縁板壁
4つの壁面木製パネル工法を断面図と施工性で徹底比較。
Opposing Rabbet Overlap Joints
Milled with matching ½-inch L-shaped steps on opposite edges. Boards rest over each other to form a tight, overlapping moisture barrier with subtle rustic character.
| Feature | Standard Shiplap | Nickel Gap | Tongue & Groove (T&G) | Board & Batten |
|---|---|---|---|---|
| Joint Design | Opposing Rabbets (½" lap) | T&G with ⅛" reveal built-in | Interlocking Tongue & Groove | Flat boards + vertical battens |
| Shadow Gap | Tight flush or slight bevel | Crisp ⅛" intentional shadow | V-groove or flush bead | High-relief 3D batten projection |
| Water Shedding | Superior (overlapping shingle action) | Good (exterior siding certified) | Excellent (tight interlock) | Good (caulk battens on siding) |
| Blind Nailing | Yes (45° nail through top lip) | Yes (through tongue shoulder) | Yes (100% concealed fastener) | No (face-nailed battens) |
| Avg Material Cost / sq ft | $2.00 – $4.50 | $2.50 – $5.00 | $2.25 – $4.75 | $1.75 – $3.50 |
| Installation Difficulty | Beginner / DIY friendly | Beginner / Fast alignment | Intermediate (tight seating) | Beginner (simple square cuts) |
入隅・出隅・巾木・コンセントボックスの納め方
細部の美しい納まりがプロの仕上がりを作ります。断面詳細図をご確認ください。
Square 1×1 Backer Corner Block
Install a square 1×1 or 1×2 wood corner cleat vertically in the inside drywall corner first. Butt your horizontal shiplap boards directly against this cleat for clean square terminations.
Inside Corners
Butt joint with 1×1 corner cleat, or caulk a tight butt joint with paintable acrylic.
Outside Corners
Precision 45° miter cuts glued with CA glue, or cover with an L-shaped solid corner moulding.
Door & Window Casings
Install casings that are at least 1/8" thicker than shiplap (minimum 3/4" to 1" casing).
Electrical Outlets
NEC 314.20 requires non-conductive box extender rings to bring outlets flush with wood face.
Interior Accent Walls vs. Exterior Siding Rules
Exterior shiplap requires specialized weather-resistive barriers, drainage gaps, and corrosion-resistant fasteners.
Interior Installation Protocol
Living rooms, bedrooms, ceilings- ✓ Direct Drywall Install: Nail directly into wall framing studs with 16ga/18ga brads.
- ✓ Adhesive Boost: Apply construction adhesive in an S-bead pattern on every board.
- ✓ Acclimation: Store wood inside the room for 48 to 72 hours prior to nailing.
Exterior Siding Protocol
Exterior cladding, sheds, porches- ✓ House Wrap WRB: Must have a continuous Weather-Resistive Barrier before boards.
- ✓ Stainless Steel Nails: Always use 304/316 stainless ring-shank nails outdoors.
- ✓ Lapping Direction: Always install horizontal siding starting from the bottom upward.
天井高に応じた板幅シミュレーター
板の幅によって部屋の天井が高く見えたり落ち着いて見えたりします。
8-Foot Ceiling Proportions
In standard 8ft ceilings (96 inches), 1×6 shiplap (4.875" reveal) creates exactly 20 horizontal courses, producing the classic balanced farmhouse proportion without feeling overcrowded.
Small Spaces & Powder Rooms
Best for cozy powder rooms, laundry rooms, entryways, and historic Victorian restorations where smaller repeating lines add texture without overpowering small spaces.
Industry Standard Benchmark
The industry benchmark. Accounts for over 70% of residential accent walls because it balances visual weight perfectly in rooms between 8ft and 10ft ceiling heights.
Great Rooms & High Ceilings
Wider boards visually stretch walls horizontally, making large living rooms and high entries feel grounded and architecturally refined.
品質管理・施工前チェックリスト
失敗を防ぐため、施工準備が完了した項目をチェックしてください。
Frequently Asked Questions
Answers to the most common questions about shiplap calculation, joinery math, and installation techniques.
木工・造作用語インタラクティブ辞典
アルファベットやキーワードで木工用語や規格を検索できます。
Acclimation
The mandatory process of storing unfinished wood boards inside the installation room for 48 to 72 hours so internal moisture content balances with ambient humidity.
Blind-Nailing
Driving a finish nail at a 45-degree angle through the upper tongue or rabbet lip so the fastener head is completely concealed by the next overlapping board course.
Board & Batten
A traditional siding or wall cladding system consisting of wide vertical planks with narrow vertical wood battens covering the seams between planks.
Box Extender Ring
A non-conductive plastic or metal extension sleeve fitted inside existing electrical outlet/switch boxes to bring receptacle faces flush with wood wall coverings (NEC 314.20).
Caulking
Applying flexible acrylic latex sealant to inside corners, window casings, and baseboards to seal perimeter transitions before painting.
Course
A single continuous horizontal (or vertical) row of shiplap boards spanning across a wall or ceiling.
Exposed Face
The visible finished surface width of a shiplap board once it is installed and overlapping with adjacent boards. Nominal 1×6 has a 4.875" exposed face.
Furring Strips
Narrow wood battens (typically 1×3 or 2×2) fastened to masonry, basement concrete, or uneven drywall to create a level, plumb framing grid for shiplap nails.
Linear Feet (LF)
The total length of lumber boards laid end-to-end in feet, calculated by dividing required board area by exposed board width in feet.
MDF (Medium Density Fiberboard)
An engineered wood product made of wood fibers glued under high pressure. Highly dimensionally stable with ultra-smooth paint surfaces, but vulnerable to liquid water.
Nickel Gap
A contemporary cladding profile featuring an intentional 1/8-inch (thickness of a US nickel) shadow reveal between boards with straight vertical shoulders.
Nominal vs. Actual
The difference between rough lumber naming (e.g. 1×6) and the actual planed dimensions after sawmill drying (0.688" × 5.375").
Rabbet Joint
An L-shaped step or recess cut along the edge of a wood board. Standard shiplap features two opposing rabbets that overlap.
Tongue & Groove (T&G)
An interlocking wood joint system where a protruding ridge (tongue) on one board fits tightly into a matching groove on the adjoining board.
Wainscoting
Wooden wall paneling covering the lower one-third to one-half of an interior wall, traditionally capped with a chair rail and baseboard.
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Thomas is a licensed finish carpenter and architectural woodworker with over 18 years of experience framing and installing interior millwork. Formulas audited against AWCI and standard NWFA milling standards.