Shiplap Siding standard pattern sample
A "Flush Joint" Square Edge profile
Ship Lap Siding is a type of Drop Lap siding with a tight "flush joint" profile. It is similar to tongue and groove but with a single over lap - usually 1/2" in depth but
can me more or less depending on the width of the board 6", 8", 10" or the shiplap profile selected.
Ship-lap siding can be installed horizontally or vertically with the edge of one board having a recessed area which receives the shaped top edge of the
board next to or below it, so as to exclude water during rainfall. In vertical applications, be sure to bevel cut the ends and install
the shiplap siding so water is directed to the outside.
Shiplap is known for its ability to form a tight seal while allowing the wood siding to "breath" with changes in season and humidity.
Unit Incense Cedar Shiplap Siding Square Edge
Red Cedar Shiplap Siding Square Edge - Installed
There are 2 standard Shiplap pattern profiles
1. Ship-lap Pattern: Square Edge
2. Ship-lap Pattern: Beveled Edge
"Shadow Gap" Profile
In the last few years a modification to the standard Shiplap "Flush Joint" profile has gained in prominance. Sometimes called Shadow Gap, Shadow Profile, Shadow Line, Small Reveal
and "Thin Line" this is a custom milled shiplap profile that includes a narrow gap where the boards overlap. When installed a "shadow" effect is created.
The diagram below outlines the joins between the installed boards. "G" is the custom milled gap which can vary based on the "shadow line" emphasis the customer is looking for -
but is usually narrow often only 3/16 - 3/8 inch.
"Shadow Gap - Shadow Line" a CUSTOM Milled Shiplap Pattern
1x6 Shadow Gap pattern
Near Clear Red Cedar Pre-Finished
Shiplap Siding TRUE Measure
You might be wondering why our Buffalo diagrams above have letters - A, B, C - instead of actual measurements. That is because siding measurements can vary from
mill to mill and lumber yard to lumber yard. Using letters allows us to confirm the TRUE dimensions with the mill before we sell to our customers.
NOMINAL SIZES are for identification only. Even though a pattern is called 1x6" or 1x8" that does not mean it measures 1 inch thick and 6 or 8 inches wide.
Nominal 1x6, 1x8 refers to the size before the pattern profile is milled and NOT the board's final finished or "dressed" dimensions.
A 1" NOMINAL is usually 11/16ths inch thick. A 6" NOMINAL shiplap pattern is usually 5 3/8 - 5 1/2" wide including the overlap which results in 4 7/8 - 5 1/8 inches of exposed face depending on lap depth.
An 8" NOMINAL shiplap pattern is usually 7 1/8 - 7 1/4" wide including the overlap which results in 6 5/8 - 6 7/8 inches of exposed face depending on the lap depth.
This is called the pattern's "exposure" - the visible part of the board when installed on your wall.
The Western Wood Products Association (WWPA) and California Redwood Association (CRA) diagrams below are industry pattern standards and display actual numbers but they are guidelines not milling requirements.
Over the years milled dimensions have shrunk (and continue to do so). Once you have calculated your project's SQUARE FOOT area
you need to get the true dimensions - especially the exposure - of the wood siding boards you are buying.
Read our Ship-lap SQFT to LFT Coverage and "Buyer Beware" warning to make sure you ask
the right questions BEFORE you BUY.
BEFORE: Rustic Indiana Horse Barn before remodel
AFTER: Red Cedar Shiplap Siding - Verticle Install
WWPA Ship-lap Siding - Paneling Pattern Diagrams
Helpful Pattern Glossary
(1) WWPA - SHIPLAP SQUARE EDGE 1/2 LAP
(2) WWPA - SHIPLAP SQUARE EDGE 3/8 LAP
(3) WWPA - SHIPLAP V2E 3/8 BEVELED EDGE 3/8 LAP
(4) WWPA - SHIPLAP WP-11 V2E 1/4 BEVELED EDGE 1/2 LAP
(5) WWPA - SHIPLAP V2E 3/8 BEVELED EDGE 3/4 CENTER V 3/8 LAP
(6) WWPA - SHIPLAP WP-7 V2E 1/4 BEVELED EDGE 1/2 CENTER V 1/2 LAP
(7) WWPA - SHIPLAP WP-9 ROUNDED EDGE 1/2 LAP 1/16 GAP
(8) WWPA - SHIPLAP WP-13 2" BEVEL TOP ROUNDED BOTTOM EDGE 1/2 LAP
Redwood Ship-lap Siding - Paneling Pattern Diagram
(1) REDWOOD CRA - SHIP LAP 761-763 SQUARE EDGE 1/2 LAP S2S
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Custom Milled 1x6 "Shadow Profile" Shiplap Clear Grade Cedar Pre-Stained Walnut - Long Island NY
SHIPLAP SQFT LFT Coverage
Ship-lap patterns are often sold by the linear (or lineal) foot. To figure out how many linear feet (LFT) you need you must multiply the square
foot area you plan to COVER by a linear factor based on the pattern width you have selected 6", 8", or 10".
The Lineal Foot Factor is derived by dividing 12 inches by the individual pattern's "exposed" face - the width that is
still visible after the siding boards are installed.
A) Calculate the square footage in walls: length x height = sq. ft.
B) Calculate, and then subtract, the square footage of openings
C) Add 10% to cover trim and waste = SQFT needed
D) Multiply SQFT result by the linear factor = LFT needed
BUYER BEWARE WARNING: The actual "dressed" widths and "Exposed Face" measurements below are suggested based on our
experience in the industry.
HOWEVER individual mills often have their own pattern standards
which vary from the norm. When you get ready to buy be sure to ASK for the exposed width to make sure you are
buying enough to complete the job!
SHIPLAP Siding Coverage Factors*
|Nominal Width||Dressed Width||Exposed Face||Linear Ft Factor|
|6" ||5 3/8" ||4 7/8" ||2.46|
|8" ||7 1/8" ||6 5/8" ||1.81|
|10" ||9 1/8" ||8 5/8" ||1.39|
* assuming 1/2" board overlap
Example of 1x8" Pattern Coverage estimation: If you are siding four walls 8 feet high by 40 feet long with 8" wide SHIPLAP
boards and you allow 10% of the total square feet for openings, you would need approximately 2300-2350 linear feet:
SQFT AREA: 4 * 8 * 40 = 1280 SQ FT - 128 (10% openings) + 115 (10% trim/waste) = 1267 SQ FT
8" Ship-lap Pattern: 1267 SQ FT * 1.81 linear factor = 2293.3 LFT
Western Red Cedar Select Tight Knot Shiplap Pattern - UnFinished mill sample closeup
Help Us Answer Your Questions
Because we are committed to answering every request, our phones ring off the hook. In order to make sure you get the attention
you deserve, we ask that you help us help you.
When you call our toll free line you will be asked a few questions to confirm if we can truly help with your project.
If it looks like we can we will set up project consultation with a sales expert.
This a 15 minute free consultation. If our products and services are a good project match, we will also give you a verbal "ball park" price and total cost estimate
to help you plan your project costs.
BEFORE we can give you a Ball Park Price we will need to know the approximate square feet required and the
Ship to location (city, state, zip). This information is used to make sure everyone who makes an appointment
receives the advice and customer service we have promised. Your information will not be shared or sold.
CONTACT Buffalo Lumber
ABOUT Buffalo Lumber
Square Edge Shiplap "Customer Select" Grade Cedar Pre-Stained Sycamore - Rustic Barn in Maine
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| BEV || Beveled |
| BEV || SDG Beveled siding |
| BS || Both sides |
| CB || Center Beaded |
| CB1S || Center bead one side |
| CB2S || Center bead two sides |
| CG || Center groove |
| CG2E || Center groove two edges |
| CLG || Ceiling |
| CM || Center matched |
| CS || Caulking seam |
| CSG || Casing |
| CV || Center Vee |
| CV1S || Center vee one side |
| CV2S || Center vee two sides |
| D2S || Dressed two sides |
| D4S || Dressed four sides |
| DB || CLG Double-beaded ceiling |
| DB || PART Double-beaded partition |
| DBL || T&G Double tongued & grooved |
| D&CM || Dressed & center matched |
| DKG || Decking |
| D/S,DS || Drop Siding |
| D || S/L Double shiplap |
| DVJM || Double vee-jointed matching |
| D&M || Dressed and matched |
| E || Edge |
| EB1S || Edge bead one side |
| EB2S || Edge bead two sides |
| E&CB2S || Edge & center bead two sides |
| EV1S || Edge vee one side |
| EV2S || Edge vee two sides |
| E&CV1S || Edge & center vee one side |
| E&CV2S || Edge & center vee two sides |
| EE || Eased Edges |
| EG || Edge (vertical) grain |
| EM || End matched |
| EV || Edge vee |
| FE || Feathered edge |
| FG || Flat (slash) grain |
| FLG || Flooring |
| F&G || Feathered & grooved |
| G1E || Grooved one edge |
| HB || Hollow back |
| MG || Mixed Grain |
| N || Nosed |
| N1E || Nosed one edge |
| N2E || Nosed two edges |
| OS || One side |
| PAT || Pattern |
| P1E || Planed one edge |
| P2E || Planed two edges |
| P1S || Planed one side |
| P2S || Planed two sides |
| P4S || Planed four sides |
| P1S1E || Planed one side one edge |
| P2S1E || Planed two sides one edge |
| P1S2E || Planed one side two edges |
| PAR || Planed all 'round |
| PART || Partition |
| PE || Planed edge |
| PPE || Planed plain edge |
| PSE || Planed square edge |
| PSJ || Planed and square jointed |
| PTG || Planed tongued and grooved |
| R&B || Rabbet & bead |
| R/F || Resawn/Rough Face |
| Rabbeted || Bevel siding with rabbet (notched cut) on bottom edge |
| S || Side, Surfaced |
| SB1S || Single bead one side |
| SDG || Siding |
| SG || Slash (flat) grain |
| S/L, || or SL Shiplap |
| SQ || Square |
| STPG || Stepping |
| S&E || Side & edge (surfaced on) |
| S1E || Surfaced one edge |
| S2E || Surfaced two edges |
| S1S || Surfaced one side |
| S2S || Surfaced two sides |
| S4S || Surfaced four sides |
| S1S&CM || Surfaced one side & center matched |
| S2S&CM || Surfaced two sides & center matched |
| S4S&CS || Surfaced four sides & caulking seam |
| S1S1E || Surfaced one side one edge |
| S1S2E || Surfaced one side two edges |
| S2S1E || Surfaced two sides one edge |
| S4SEE || Surfaced four sides eased edges |
| T&G || Tongued and grooved |
| TG&B || Tongued, grooved, and beaded |
| TG&V || Tongued, grooved, and vee-jointed |
| T1E || Tongued one edge |
| UE || Unedged |
| V2E || Beveled V on two Edges |
| V4E || Beveled V on four Edges |
| VG || Vertical grain |
| VJM || Vee-joint matching |
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