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Date:
Project:
Subject:
july 25, 20L9
62 Sweeetgrass Drive, Aspen Glen, Carbondale, CO
Attic Venting Calculations
Dear Building Department Officials;
Minimum Reouired Vent Aree Calculation
The attic areas at the subject property are as follows;
246L sqft at the front half of the residence
3752 sq ft at the rear half
6213 sq ft total attic area
Divide the attic area by 150 renders minimum attic vent area of 42 sq ft
Note: at least 50% of the venting must be located within 36" of the ridge (21- sq ft min)
Venting Areas As lnstallgd (see accompanving roof plan for vent locations)
Ridge Vent width
L. 4"
2. (not exposed)
3. 4"
4. 3.5"
5. (not exposed)
6. 4"
7. 4"
8. 4"
2'
9. (not exposed)
vent area (sq ft)
2.0
-0- (No value given)
5.6
L.5
-0- {No value given)
1.5
3.0
1.5
.75
-0- (No value given)
L3.7 sq ft
6.4 so ft
length
6'
3'
77'
4.5'
5',
4'
9'
4'
4',
5'
L0. 4u 4.5' 1.5
1"L. (not exposed) 6.5' -0- (No value given)
L2. (no ridge vent found) -0- (No value given)
1"3. 4" 5' 1".5
L4. 4" ].8' 6.0
Ridge vent total area 24.8 sq Ît (59% of required)..................24.8
lurtle" vents- 8 total @ 50 sq in = 400 sq in 2.8 sq ft.......2.8
Soffit Vents (4 " diam = value of .08 sq ft)
Lower soffit vents L72x .A8 =
Upper soffit vents 80 -O8 =
Soff¡t vent total 20.1- so ft.20.L
TOTALATTICVENTS 47.7 sqft
by; Curt Architect, NCARB
Esperanza Architecture & Construction Consulting, lnc. 239 Goose Lane, Carbondale, CO 81 623