Illinois Roofing License IDFPR #19HC00108700 · GAF Certified Contractor
Most Illinois roofing happens between April and November – but if your roof fails in January, waiting until spring isn’t always an option. Cold weather roofing is technically possible and sometimes necessary, but it has real tradeoffs that homeowners should understand before committing to a winter install. This guide covers when winter roofing makes sense, what changes about the installation, and how Trill Roofing handles cold-weather work.
Why temperature matters
Asphalt shingles have a thin strip of factory-applied adhesive on the underside. When shingles are installed and exposed to warm sun, the adhesive softens and bonds the shingle to the one below. This seal-down is what keeps shingles from blowing off in wind events.
The seal-down process requires:
- Direct sunlight for several hours
- Ambient temperatures above ~40°F
- A few consecutive days without precipitation or freezing temperatures
When these conditions aren’t present, the seal strip stays inert and the shingle doesn’t bond properly. In Illinois winter – typically December through March – those conditions are rare.
The cold weather installation problem
Two specific issues come up in cold weather roofing:
1. Cracking shingles. Asphalt becomes brittle in cold weather. Below about 40°F, shingles can crack along the nailing zone when bent or nailed. Architectural shingles (thicker, with polymer modification) handle cold better than 3-tab. Below 25°F, even architectural shingles can crack during install – manufacturers recommend not installing at all below this temperature.
2. Seal strip won’t activate. Without seal-down, shingles are held in place only by the nails. Single-shingle wind tolerance drops dramatically – a 130 mph rated shingle might lift in a 30 mph gust if the seal hasn’t activated.
The combination means cold-installed shingles need additional steps to perform their full warranty rating.
Hand-sealing – the cold weather mitigation
When roofing must be done in cold weather, hand-sealing is the standard mitigation:
- After shingles are nailed, apply 4-6 quarter-sized dabs of roofing cement to the underside of each shingle along the seal strip zone
- Press the shingle down to bond with the one below
- Repeat for every shingle on the roof
This manually creates the bond that the seal strip would have created in warm weather. It’s labor-intensive (adds 30-50% to install labor) but produces a roof that performs to the manufacturer’s wind rating.
Trill Roofing hand-seals every cold-weather install when ambient temperatures are below 40°F during installation. This is a non-negotiable spec – we won’t install in cold weather without hand-sealing because the result wouldn’t perform.
When to schedule cold weather roofing
Reasons to do a winter roof install:
- Active leak from storm damage – emergency response, can’t wait until spring
- Insurance claim deadline pressure – some claim approvals have time-limited completion requirements
- Buying or selling the home – closing dates that don’t accommodate spring timing
- Mortgage or lender requirement – refinance or new mortgage requires roof in good condition
Reasons to wait:
- The roof is functional and there’s no urgent leak
- You can do a temporary repair (tarp, patch, hand-seal individual problem spots) until spring
- The cold-weather install premium (hand-sealing labor) is a meaningful budget concern
What winter installation actually involves
A Trill Roofing winter install differs from a spring install in several ways:
- Weather monitoring – we only install on days that are at least above 25°F and not forecasted for precipitation within 48 hours
- Hand-sealing every shingle as we install it
- Roofing cement and adhesives stored warm (in the truck) and used quickly before they thicken in cold air
- More frequent breaks for crew (cold is physically draining)
- Salt or sand on walking surfaces (icy decking is dangerous)
- Possible install delays if weather window closes mid-job
Cost premium over spring/summer installation: typically 10-20%, primarily from the hand-sealing labor.
Temporary measures while waiting
If your roof needs eventual replacement but you can wait until spring, temporary measures during winter:
- Tarp emergency leaks – heavy-duty plastic tarps secured with battens prevent further water entry until repair
- Pipe boot replacement – single-component repairs in mild winter weather are feasible
- Roof rake snow load – pull snow off the lower 3-4 feet of the roof from the ground to prevent ice dams
- Insulation top-up + air sealing – attic work that addresses ice dam root causes is winter-compatible
Call Trill Roofing at (618) 304-7094 if you have an active winter leak – same-day tarp response and free post-leak inspection.
Spring is the right time when possible
For non-emergency work, spring (April-May) is typically the best time to schedule:
- Warm enough for proper seal-down
- Before summer heat (which slows install crews and stresses materials)
- Before storm season (June-August events frequently shift scheduling)
- Contractor availability is highest in spring
Schedule your spring 2026 install now to lock in the early window. Free inspection at /free-inspection/.
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