Specifying Siding - Products
& Sizes
Table 1. Size differential Between
Unseasoned and Dry Lumber
Nominal
Dimension (in.) |
Size Differential Between
Unseasoned and Dry Lumber
After Surfacing (in.) |
| 1-1/2 or less |
1/32 |
| 2 to 4 |
1/16 |
| 5 to 7 |
1/8 |
| 8 or more |
1/4 |
Table 2. Western Red Cedar Products
| Product |
Thickness inches
(nominal) |
Width inches
(nominal) |
Grade |
Grading Rule Paragraph |
| NLGA |
WWPA |
WCLIB |
Bevel Siding
Clear |
1/2, 3/4 |
4, 6, 8, 10 |
Clear V.G. Heart
A
Rustic
B
C
Proprietary
|
201a
201b
201d
201c
201e
n/a |
21.11
21.12
n/a
21.13
21.14
n/a |
106-aa
106-a
n/a
106-b
106-c
n/a |
| Knotty |
5/8, 11/16 3/4, 7/8 |
6, 8, 10, 12 |
Select Knotty
Quality Knotty
Proprietary
|
205a
205b
n/a
|
30.22
30.23
n/a
|
111-e
111-f
n/a |
| Knotty-Rabbetted |
3/4, 5/4 |
6, 8, 10 |
Select Knotty
Quality Knotty
|
205a
205b
|
30.22
30.23
|
111-e
111-f |
| Knotty-Wavy Edged |
7/8 |
10, 12 |
Select Knotty
Quality Knotty
|
205a
205b
|
30.22
30.23
|
111-e
111-f |
Pattern Siding
Clear |
1 |
4, 6, 8 |
Clear Heart
A
B
|
200a
200b
200c
|
20.11
20.12
20.13
|
102-b
102-c
102-d |
| Knotty |
1 |
4, 6, 8, |
Select Knotty
Quality Knotty
Standard and Better
Proprietary
|
204a
204b
114a,b,c
n/a
|
30.22
30.33
n/a
n/a
|
111-e
111-f
118-a,b,c
n/a |
| Clear Finish |
1/2, 1, 5/4, 2 |
2, 3, 4, 6, 8, 10, 12
|
Clear Heart
A
B
|
200a
200b
200c
|
20.11
20.12
20.13
|
102-b
102-c
102-d |
| Boards |
1 |
2, 3, 4, 6, 8, 10, 12
|
Select Knotty
Quality Knotty
Standard and Better
|
204a
204b
114a, b, c
|
n/a
n/a
30.50
(118-a, b, c)
|
111-e
111-f
118a, b, c
|
| Fence Boards |
1 |
6, 8, 10 |
Select Knotty
Quality Knotty
Rustic
|
210a
210b
n/a
|
n/a
n/a
n/a
|
117-a
117-b
117-c |
| Roof Decking |
2, 3, 4, |
6, 8 |
Select
Commercial
|
127b
127c
|
55.11
55.12
|
127-b
127-c |
Outdoor Decking
Clear |
5/4, 2 |
4, 6 |
Architect Clear
Custom Clear
Contractor Clear
|
n/a
n/a
n/a
|
n/a
n/a
n/a
|
n/a
n/a
n/a |
| Knotty |
5/4, 2 |
4, 6 |
Architect Knotty
Custom Knotty
Contractor Knotty
|
n/a
n/a
n/a
|
n/a
n/a
n/a
|
n/a
n/a
n/a |
Paneling
Clear |
1/2, 1 |
4, 6, 8 |
Clear Heart
A
B
|
200a
200b
200c
|
20.11
20.12
20.13
|
102-b
102-c
102-d |
| Knotty |
1/2, 1 |
4, 6, 8 |
Select Knotty
Quality Knotty
|
204a
204b
|
n/a
n/a
|
111-e
111-f |
| Garden Lumber |
2, 3, 4
2, 3, 4
|
2, 3, 4,
6, 8, 10, 12
|
Appearance
Standard and Better
Appearance
No.2 and Better
|
n/a
122b,c
n/a
124a,b,c
|
n/a
40.11,
12
n/a
62.10, 11, 12
|
n/a
122-b, c
n/a
123-a, b, c |
| Timbers |
5, 6, 8, 10, 12 |
5, 6, 8, 10,12 and wider |
Appearance
Standard and Better
|
n/a
131a,b,c
|
n/a
80.10, 11, 12
|
n/a
131-a, b, c |
Structural
Timbers |
5, 6, 8, 10, 12 |
5, 6, 8, 10, 12
*Width more than 2" greater than thickness
|
*no.2 and Better |
130a,b,cc |
70.10, 11, 12 |
130-a, b, cc |
Notes:
- Siding is available kiln-dried or air-dried
with smooth or saw-textured surface. Factory
primed siding is also available.
- Paneling is available kiln-dried with smooth
or saw-textured surface.
- Grade descriptions are given in NLGA, WWPA,
and WCLIB grading rules. Grade descriptions
of proprietary products are available from the
manufacturer.
|
Table 3. Sizes of Rough Western Red
Cedar
| Thickness (in.) |
1 |
1-3/4 |
2 |
3 |
4 |
6 |
8 |
10 |
12 |
14 |
| Width (in.) |
2 |
4 |
6 |
8 |
10 |
12 |
14 |
|
|
|
Table 4. Sizes of Dressed Western
Red Cedar
| Item |
Thickness (in.) |
Width (in.) |
| Nominal |
Actual |
Nominal |
Actual |
| Dry |
Green |
Dry |
Green |
| Boards |
1
1-1/4
|
11/16
1
|
3/4
1-1/32
|
2
3
4
6
8
10
12
|
1-1/2
2-1/2
3-1/2
5-1/2
7-1/4
9-1/4
11-1/4
|
1-9/16
2-9/16
3-9/16
5-9/16
7-3/8
9-3/8
11-3/8
|
| Garden Lumber |
2
3
4
|
1-1/2
2-1/2
3-1/2
|
1-9/16
2-9/16
3-9/16
|
2
3
4
6
8
10
12
|
1-1/2
2-1/2
3-1/2
5-1/2
7-1/4
9-1/4
11-1/4
|
1-9/16
2-9/16
3-9/16
5-9/16
7-3/8
9-3/8
11-3/8
|
| Timbers* |
5
6
8
|
|
4-1/2
5-1/2
7-1/2
|
5
6
8
|
|
4-1/2
5-1/2
7-1/2
|
*Surfaced timbers 10" and larger available only on
special order. Confirm before specifying. |
