How often does a Ottumwa roof freeze and thaw in a year?

Roughly 82 times. Each cycle expands and contracts the membrane, seams, and flashings on a Ottumwa, IA commercial roof, which is why monolithic systems outlast seamed ones here.

What design wind speed applies to commercial roofs in Ottumwa, IA?

The governing numbers for Ottumwa, IA are a 110 mph ASCE 7 basic wind speed at Exposure C. ASCE 7 does not use "zones"; it uses a wind speed and an exposure category, and both should be confirmed with the local building department before specifying.

What is the average annual snowfall in Ottumwa, IA?

About 24 inches a year (NOAA 1991-2020 normals). What matters on a flat roof is where that snow drifts and how it melts, not just the total.

What is A-1 Roofing's response time in Ottumwa, IA?

Our target is 24 business hours for a first response in Ottumwa. Active leaks are prioritised ahead of scheduled assessments.

What snow load and wind speed do Ottumwa, IA building codes assume?

Ground snow load of 20 psf (ASCE 7-22 regional estimate, tied with Iowa City for the lowest of the 11 cities; verify with local building department or ASCE Hazard Tool.) and a 110 mph design wind speed at Exposure C (Regional Central Plains estimate, 105 to 115 mph range; verify with ASCE 7 Hazard Tool or local building official.). Treat both as the starting point and confirm them with the Ottumwa building department.

When can coating and foam work be done in Ottumwa, IA?

The frost-free window in Ottumwa, IA runs from about April 29 to October 7, 181 days. Silicone and foam both have minimum substrate temperatures, so most full-system work is booked inside it.

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Commercial roofing on site in 24 business hours across Ottumwa, IA

Humid continental with 82 freeze-thaw cycles in southeastern Iowa's food processing and manufacturing anchor.

Ottumwa, Iowa41.020°N 92.411°WA-1 Roofing dispatch

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Dispatch Notes for Ottumwa

01
Ottumwa is at the edge of A-1's southeastern Iowa coverage zone, with response from the Waterloo-Des Moines corridor covering the market
02
A local farm-equipment plant produces planting equipment and has a large industrial building footprint with low-slope manufacturing roofing requirements
03
The local pork processing facility is one of the largest such operations in Iowa, with specialized condensation and drainage requirements from refrigerated processing environments
04
Coverage area: Ottumwa's commercial roofing base spans a revitalized, high-traffic downtown Main Street district, a rail-served industrial and commercial zone, and a busy Highway 34 retail strip, a mix of low-slope downtown commercial roofs and larger-footprint retail and industrial roofs along the highway corridors.

Large-scale pork processing, a farm-equipment manufacturing plant (planter manufacturing), regional healthcare, and retail in southeastern Iowa.

Sectors Served

01food processing

02manufacturing

03healthcare

04retail

05agriculture

Climate at a Glance

Freeze-thaw: 82est. / yr
Avg snowfall: 24in
Avg July high: 86°F
Design wind: 110mph
Last spring frost: April 29
First fall frost: October 7
Freeze-free days: 181days

Wapello County carries a FEMA National Risk Index tornado score of 81.8, the second-lowest tornado score of the 11 counties in this brief, with overall county risk in the 65th percentile nationally. Statewide hail, roughly 2 to 4 days per year and generally milder in the southeast than the northwest, and the Iowa May through August severe season both apply.

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Ottumwa, IA · 41.020°N 92.411°W · A-1 Roofing dispatch

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Load specs · Ottumwa structural profile

Ground snow load20psf

ASCE 7-22 regional estimate, tied with Iowa City for the lowest of the 11 cities; verify with local building department or ASCE Hazard Tool.

Design wind speed110mph

Regional Central Plains estimate, 105 to 115 mph range; verify with ASCE 7 Hazard Tool or local building official.

Local roofing reference

Ottumwa roofing facts

06 data points

01How often does a Ottumwa roof freeze and thaw in a year?: Roughly 82 times. Each cycle expands and contracts the membrane, seams, and flashings on a Ottumwa, IA commercial roof, which is why monolithic systems outlast seamed ones here.
02What design wind speed applies to commercial roofs in Ottumwa, IA?: The governing numbers for Ottumwa, IA are a 110 mph ASCE 7 basic wind speed at Exposure C. ASCE 7 does not use "zones"; it uses a wind speed and an exposure category, and both should be confirmed with the local building department before specifying.
03What is the average annual snowfall in Ottumwa, IA?: About 24 inches a year (NOAA 1991-2020 normals). What matters on a flat roof is where that snow drifts and how it melts, not just the total.
04What is A-1 Roofing's response time in Ottumwa, IA?: Our target is 24 business hours for a first response in Ottumwa. Active leaks are prioritised ahead of scheduled assessments.
05What snow load and wind speed do Ottumwa, IA building codes assume?: Ground snow load of 20 psf (ASCE 7-22 regional estimate, tied with Iowa City for the lowest of the 11 cities; verify with local building department or ASCE Hazard Tool.) and a 110 mph design wind speed at Exposure C (Regional Central Plains estimate, 105 to 115 mph range; verify with ASCE 7 Hazard Tool or local building official.). Treat both as the starting point and confirm them with the Ottumwa building department.
06When can coating and foam work be done in Ottumwa, IA?: The frost-free window in Ottumwa, IA runs from about April 29 to October 7, 181 days. Silicone and foam both have minimum substrate temperatures, so most full-system work is booked inside it.

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