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New NY State Building Codes - Roofing
New York State recently adopted the National BOCA building codes. This
impacts New York State construction in several ways:
R907.3 - Recovering versus replacement
New roof coverings shall not be installed without first removing existing
roof coverings where any of the following conditions occur:
- Where the existing roof or roof covering is water-soaked or has
deteriorated to the point that the existing roof or roof covering is not
adequate as a base for additional roofing.
- Where the existing roof covering is wood shake, slate, clay, cement
or asbestos-cement tile
- Where the existing roof has two or more applications any type of
roofing.
Exceptions:
- Complete and separate roofing systems such as standing-seam metal
roof systems, that are designed to transmit the roof loads directly to
the building's structural system and that do not rely on existing roofs
and roof coverings for support shall not require the removal of existing
roof coverings.
- Metal paned, metal shingle, and concrete and clay tile roof
coverings shall be permitted to be installed over existing wood shake
roofs when applied in accordance with Section R907.4
R905.2.7.1 - Ice Protection
In areas where the average daily temperature in January is 25 degrees F
(-4 degrees C) or less or when Table R301.2(1) criteria so designates, an
ice barrier that consists of at least two layers of underlayment cemented
together or of a self-adhering polymer modified bitumen sheet, shall be used
in lieu of normal underlayment and extend from the eave's edge to a point at
least 24 inches (610 mm>) inside the exterior wall line of the building.
Feet of Ice Backup Protection to Meet NY State Building Code
(Backup protection is available only in 3 foot rolls)
|
Overhang
(Inches) |
Roof Pitch |
| 4/12 |
5/12 |
6/12 |
7/12 |
8/12 |
9/12 |
10/12 |
11/12 |
12/12 |
| 2 |
3' |
3' |
3' |
3' |
3' |
3' |
3' |
3' |
3' |
| 4 |
3' |
3' |
3' |
3' |
3' |
3' |
6' |
6' |
6' |
| 6 |
3' |
3' |
3' |
3' |
6' |
6' |
6' |
6' |
6' |
| 8 |
3' |
3' |
3' |
6' |
6' |
6' |
6' |
6' |
6' |
| 10 |
3' |
6' |
6' |
6' |
6' |
6' |
6' |
6' |
6' |
| 12 |
6' |
6' |
6' |
6' |
6' |
6' |
6' |
6' |
6' |
Actual Rafter Distance (Inches) From Eave to a Point Above 2'
From Outside Wall
|
Overhang
(Inches) |
Roof Pitch |
| 4/12 |
5/12 |
6/12 |
7/12 |
8/12 |
9/12 |
10/12 |
11/12 |
12/12 |
| 2 |
27.4 |
28.2 |
29.1 |
30.1 |
31.2 |
32.5 |
33.8 |
35.3 |
36.8 |
| 4 |
29.5 |
30.3 |
31.3 |
32.4 |
33.7 |
35.9 |
36.4 |
38.0 |
39.6 |
| 6 |
31.6 |
32.5 |
33.5 |
34.7 |
36.1 |
37.5 |
39.3 |
40.7 |
42.4 |
| 8 |
33.7 |
34.7 |
35.8 |
37.9 |
38.5 |
40.0 |
41.7 |
43.4 |
45.3 |
| 10 |
35.8 |
36.8 |
38.3 |
39.4 |
40.9 |
42.5 |
44.3 |
46.1 |
48.1 |
| 12 |
37.9 |
39.0 |
40.2 |
41.7 |
43.3 |
45.0 |
46.9 |
48.8 |
50.9 |