TRY-TECH INDUSTRIES

Attaching Awning to Roof Overhang

Attaching to the Fascia is a popular installation option, especially for homes that have a low roof overhang height; another reason is for a seamless look where the patio cover is a continuation of the roof. If you have a low roof overhang attaching to the wall just does not allow enough patio cover height, however make sure you keep in mind that solid roof patio cover awnings require a roof slope of 1/2" per foot minimum; the farther your projection extends the lower the cover will become. Fascia boards are required to be of 2"x wood, more Fascia Board Installation information can be found below.

Is your Roof Eave strong enough?:

The aluminum awnings are designed to a specific live load or snow load per square foot and a wind factor in mph, the aluminum awning will potentially transfer that designed load to your homes eave overhang. Your eave overhang needs to be built strong enough to handle the additional stress the aluminum awning will place on it.

Some eave overhangs are strong enough to handle the aluminum awnings additional load and some are not; the list below displays the variables that determine if your eave overhang is strong enough based on the products IBC 2006 Engineering Report and you can apply your information to the eave overhang design table below.

  • Rafter Size
  • Rafter Spacing
  • Roof Overhang Projection
  • Size of Desired Awning Cover
  • Design Load
  • Wind Factor & Exposure

Solid Patio Cover Roof Eave Overhang Table based on IBC 2006 Engineering Report

Table below illustrates maximum patio cover projection to post line (L) see overhang drawing below. Note: The maximum patio cover projection does not include your house eave overhang projection;it is from the outside face of your fascia board to the first line of posts. The maximum patio cover projections are the cells below highlighted in blue in table below.

Roof Eave Overhang Table for: Classic "W" Patio Covers & Alumawood Newport Patio Covers

(See Alumawood Laguna Open Roof Arbor Lattice Table Below this table.)

 

 
Design Load

Live Load or
Ground Snow Load

House
Rafter Size

24" on Center Spacing or less.

House Eave / Roof Overhang Projection

(Distance from wall to outside face of fascia board.)

6"
12"
18"
24"
30"
 
10 lbs

per sq./ft.
Live Load /
Ground Snow Load
90 MPH Wind
Exposure B

2" x 4"
21'-0"
20'-9"
12'-0"
7'-1"
3'-8"
2" x 6"
21'-0"
21'-0"
21'-0"
21'-0"
17'-1"
2" x 8"
21'-0"
21'-0"
21'-0"
21'-0"
21'-0"
 
10 lbs

per sq./ft.
Live Load /
Ground Snow Load
90 MPH Wind
Exposure C

2" x 4"
21'-0"
19'-3"
11'-6"
7'-1"
3'-8"
2" x 6"
21'-0"
21'-0"
21'-0"
21'-0"
16'-7"
2" x 8"
21'-0"
21'-0"
21'-0"
21'-0"
21'-0"
 
20 lbs

per sq./ft.
Live Load /
Ground Snow Load
105 MPH Wind
Exposure B

2" x 4"
14'-0"
10'-4"
6'-0"
3'-6"
1'-10"
2" x 6"
14'-0"
14'-0"
14'-0"
11'-11"
8'-6"
2" x 8"
14'-0"
14'-0"
14'-0"
14'-0"
14'-0"
 
25 lbs

per sq./ft.
Live Load /
Ground Snow Load
105 MPH Wind
Exposure C

2" x 4"
13'-6"
9'-11"
5'-8"
3'-3"
1'-8"
2" x 6"
13'-6"
13'-6"
13'-6"
11'-5"
8'-1"
2" x 8"
13'-6"
13'-6"
13'-6"
13'-6"
13'-6"
 
30 lbs

per sq./ft.
Ground Snow Load
110 MPH Wind
Exposure C

2" x 4"
10'-7"
7'-7"
4'-3"
2'-3"
0'-0"
2" x 6"
10'-7"
10'-7"
10'-7"
8'-7"
5'-11"
2" x 8"
10'-7"
10'-7"
10'-7"
10'-7"
10'-7"
 
40 lbs

per sq./ft.
Ground Snow Load
Exposure C

2" x 4"
8'-10"
6'-1"
3'-1"
0'-0"
0'-0"
2" x 6"
8'-10"
8'-10"
8'-10"
6'-8"
4'-4"
2" x 8"
8'-10"
8'-10"
8'-10"
8'-10"
8'-10"
 
60 lbs

per sq./ft.
Ground Snow Load
Exposure C

2" x 4"
6'-5"
4'-0"
0'-0"
0'-0"
0'-0"
2" x 6"
6'-5"
6'-5"
6'-5"
4'-0"
2'-2"
2" x 8"
6'-5"
6'-5"
6'-5"
6'-5"
5'-11"

 

 

Arbor Lattice Roof Eave Overhang Table based on IBC 2006 Engineering Report

Table below illustrates maximum arbor lattice cover projection to post line (L) see overhang drawing below. Note: The maximum patio cover projection does not include your house eave overhang projection;it is from the outside face of your fascia board to the first line of posts. The maximum patio cover projections are the cells below highlighted in blue in table below.

Roof Eave Overhang Table for: Alumawood Laguna Open Roof Arbor Lattice

(See Standard Aluminium & Alumawood Newport Solid Roof Table Above.)

 

 
Design Load

Live Load or
Ground Snow Load

House
Rafter Size

24" on Center Spacing or less.

House Eave / Roof Overhang Projection

(Distance from wall to outside face of fascia board.)

6"
12"
18"
24"
30"
 
10 lbs

per sq./ft.
Live Load /
Ground Snow Load
90 MPH Wind
Exposure B

2" x 4"
21'-0"
20'-9"
12'-0"
7'-2"
3'-9"
2" x 6"
21'-0"
21'-0"
21'-0"
21'-0"
17'-2"
2" x 8"
21'-0"
21'-0"
21'-0"
21'-0"
21'-0"
 
10 lbs

per sq./ft.
Live Load /
Ground Snow Load
90 MPH Wind
Exposure C

2" x 4"
21'-0"
19'-3"
11'-6"
7'-2"
3'-9"
2" x 6"
21'-0"
21'-0"
21'-0"
21'-0"
16'-7"
2" x 8"
21'-0"
21'-0"
21'-0"
21'-0"
21'-0"
 
20 lbs

per sq./ft.
Live Load /
Ground Snow Load
105 MPH Wind
Exposure B

2" x 4"
14'-0"
10'-4"
6'-0"
3'-7"
1'-10"
2" x 6"
14'-0"
14'-0"
14'-0"
11'-11"
8'-7"
2" x 8"
14'-0"
14'-0"
14'-0"
14'-0"
14'-0"
 
25 lbs

per sq./ft.
Live Load /
Ground Snow Load
105 MPH Wind
Exposure C

2" x 4"
15'-4"
11'-4"
6'-6"
3'-9"
1'-11"
2" x 6"
15'-4"
15'-4"
15'-4"
13'-0"
9'-3"
2" x 8"
15'-4"
15'-4"
15'-4"
15'-4"
15'-4"
 
30 lbs

per sq./ft.
Ground Snow Load
110 MPH Wind
Exposure C

2" x 4"
12'-10"
9'-3"
5'-1"
2'-9"
0'-0"
2" x 6"
12'-10"
12'-10"
12'-10"
10'-5"
7'-3"
2" x 8"
12'-10"
12'-10"
12'-10"
12'-10"
12'-10"
 
40 lbs

per sq./ft.
Ground Snow Load
Exposure C

2" x 4"
9'-7"
6'-7"
3'-5"
0'-0"
0'-0"
2" x 6"
9'-7"
9'-7"
9'-7"
7'-3"
4'-8"
2" x 8"
9'-7"
9'-7"
9'-7"
9'-7"
9'-7"
 
60 lbs

per sq./ft.
Ground Snow Load
Exposure C

2" x 4"
6'-5"
4'-0"
0'-0"
0'-0"
0'-0"
2" x 6"
6'-5"
6'-5"
6'-5"
4'-1"
2'-2"
2" x 8"
6'-5"
6'-5"
6'-5"
6'-5"
5'-11"

Securing Fascia Board to House Rafters per 2006 ICC Engineering:

The Patio Cover will need to attach to a 2"x Fascia board and if you do not have a Fascia board one will need to be installed and the Fascia board needs to be properly secured to the Rafters of your Roof Overhang.

The ICC 2006 Engineering Report # 1398 calls for three 5/16" Lag Screws to be bolted through the 2"x Fascia board into the house rafters.

A34 Clip Note: While this is an engineered design we still believe and recommend the use of the A34 Clips. The A34 Clips are cheap and is the old design use by the now outdated ICBO Engineering Report; the A34 Clips create a mechanical connection. Using two 3/8" Bolts into the end grain of your house rafters is an engineered design however doesn't have the tried and true reputation of using the A34 Clips.

The A34 Clips can be purchased locally and are very inexpensive; the A34 Clips attach to the back side of fascia board and side of rafter; if you have a closed soffit this will pose some issues for installing the A34 Clip however if you have a closed soffit please contact us for possible options.

Note: As the image below shows the new 2009 ICC Engineering Report #1398 call for a 20 gauge Steel Bracket like the A34 clip instead of using the three 5/16" lag screws.

Image displays a cantilevered post design, same concept applies to non-cantilevered post designs.

Fascia Eave Attachment Drawing
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