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USA & Canada
Western Red Cedar Lap/Channel Siding
Introduction
Channel (a.k.a. Lap) Siding is a popular type of siding and is used whenever a rustic appearance is desired. A versatile siding, it can be installed vertically, horizontally or diagonally. In channel siding the profile of each board partially overlaps that of the board next to it creating a channel that gives shadow line effects, provides excellent weather protection and allows for dimensional movement.
Grades
Lap/Channel Siding Grading
Lap sidings are normally supplied in a variety of patterns either green (unseasoned) or dry in clear or knotty grades and with a smooth or saw textured face.
Channel siding is normally supplied in unseasoned knotty grades. The face side is saw textured. Commonly available sizes are 1″x6″, 1″x8″, and 1″x10″. Clear grades are manufactured to order.
Please visit the Siding Grades page for more photos of various siding grades.
Coverage
Lap/Channel Siding Coverage
Lap Siding Coverage Table for Green (Unseasoned) Siding
| Nominal Width (in.) | Dressed Width (in.) | Exposed Face Width (in.) | Linear Feet Factor | Board Feet Factor |
|---|---|---|---|---|
| 6 | 5-1/2 | 4-3/4 | 2.53 | 1.27 |
| 8 | 7-3/8 | 6-5/8 | 1.81 | 1.21 |
| 10 | 9-3/8 | 8-5/8 | 1.39 | 1.16 |
Specifications
Lap/Channel Siding Specifications
The following information is required when specifying lap siding products:
| Specification Information Required | Sample Specification |
|---|---|
| Species: Western Red Cedar | WRCLA Western Red Cedar |
| Product Pattern and Intended Use: Siding is used as an exterior cladding to provide both weather protection and architectural style. The designer may choose from a variety of lap siding patterns specified by name or pattern number. | Lap Siding Pattern WP11 |
| Size: Specify the nominal size of the product. | 1 x 6″ |
| Grade: The grade of the product governs its overall quality. Refer to WRCLA specification literature or grading agency rule books for available grades. | Select Knotty |
| Grading Agency Paragraph: To ensure that the product meets a written standard, an agency grade paragraph should be referenced. | NLGA para. 204a |
| Moisture Content: Specify whether the product is to be green (unseasoned) or kiln-dried. | Green |
| Surface to be exposed: Specify the application orientation to assist the supplier in shipping the right product for the job. | Sawn face |
| Quantity: Express in linear feet the quantity required. | 2,000 linear feet |
