On January 5, 2021, construction began on the rooftop of Shinan Hyundai Apartment.
It was the coldest time of the year, and the roof to be waterproof was 5,661 ㎡ .
Resident Representative Meeting, did not wait for the spring and finished on February 4, .
Shinan Hyundai Apartment Pre-construction — Rooftop with worn urethane and rainwater
After the construction of Shinan Hyundai Apartment — Closed 5,661 ㎡ during the month of January
It's not just about this site.
Owellsteel On the homepage portfolio, Site where construction began between December and February Lee There are several places up to the apartment, government offices, factories, and performance venues.
Is it possible to waterproof the rooftop in winter? Based on these sites, we have outlined what should be checked if at all possible.
Why we postpone waterproofing to spring in winter
In the
waterproofing industry, the "No waterproofing in winter" has been through horses for a long time.
This horse is not wrong based on painted and hardened waterproof .
- coatings do not harden well
Paint waterproofing materials such as urethane can cause curing to slow down if the temperature is low and remain defective without properly hardening. - based water becomes a problem
If frost and snow melt water are painted on the remaining base, the adhesion is weakened and it is easy to swell later. - Once painted does not end
I have to paint multiple layers and wait for each layer to harden, so the construction period will be longer after a cold day.
winter process — coating waterproofing has to wait for each layer to harden, but prefabricated assemble the finished panel
So even if there is a leak in winter, "Let's do it in spring" often postpones construction.
The problem with
is that the leakage doesn't stop in between.
Sminned water in the cracks freezes and increases in volume, spreading the cracks further, Whenever the accumulated snow melts, water enters the same spot.
What's different about
prefabricated steel waterproofing
ROOFGUARD is a rooftop assembly of factory-made steel panels.
There is no process waiting for the
film to harden, as it is not a painted film at the site, but a finished and incoming panel.
The existing waterproof layer is also constructed on top of it without removing it.
Factory-made waterproof panel is put down on the roof and assembled.
panel and secure with nut
Of course, winter doesn't mean you can't work on it any day.
Since
panel fittings use silicon and primer at the bottom of the wall, recommends resting from work and rescheduling on snowy, rainy, or severe cold days.
And after finishing the construction, Refrain from using the rooftop so that the silicone hardens for about 7 days of the environments.
If you factor those two things into your schedule, Winter can also be constructed without being too different from other seasons.
Sites constructed in the middle of winter
| Xuanzang | Use | Water-proof area | Conventional waterproof layer | Construction Period |
|---|---|---|---|---|
| Shinan Hyundai Apartment | Condominium | 5,661 ㎡ | urethane coating | 2021.1.5 ~ 2.4 |
| Gimcheon City Hall | Business Facility | 1,097 ㎡ | Pressed Concrete | January 7, 2020 - January 1, 2020.9 |
| vow | Factory | 990 ㎡ | urethane coating | Feb.1-2.6, 2019 |
| Daepoong Industrial Complex Public Wastewater Treatment Facility | Resource Circulation Facility | 864 ㎡ | urethane coating | 2023.12.8 ~ 12.15 |
| Yeoju Public Postpartum Culinary Center | Neighborhood Living Facility | 802 ㎡ | Pressed Concrete | 2026.2.24 ~ 2.26 |
| Voice Group School Food Support Center | Neighborhood Living Facility | 683.04 ㎡ | Combined Sheet | 2025.2.4 ~ 2.28 |
| Daegu Opera House (stage area) | Culture · Assembly Facility | 626.2 ㎡ | urethane coating | 2025.12.3 ~ 12.5 |
| Young Dream House, Sangju-si | Business Facility | 451.8 ㎡ | Pressed Concrete | 2025.2.14 ~ 2.18 |
| Hyundai Mifo Apartment | Condominium | 208 ㎡ | urethane coating | 2023.12.29 ~ 2024.1.2 |
| Sihwa Plant | Factory | 203.6 ㎡ | urethane coating | 2024.1.20 ~ 2.3 |
| Asan City Living Resource Treatment Plant | Resource Circulation Facility | 164 ㎡ | Pressed Concrete | 2025.12.10 ~ 12.11 |
Owellsteel website portfolio standard, some of the sites that started construction in December-February. The construction period covers the entire site schedule.
building types and existing waterproof layers are unique.
Let's take a look at some
pictures.
Gimcheon City Hall — January, 1,097 ㎡ in three days
From 7 to 9 January 2020, Gimcheon City Hall Rooftop 1,097 ㎡ in three days Closed.
The existing waterproof layer was covered with a green coating on the pressed concrete. There was a long steel awning structure above the rooftop.
The structure was left intact, with panels underneath and around it.
— Wrapped rooftop under awning structure before Gimcheon City Hall construction
After Gimcheon City Hall construction, — closed 1,097 ㎡ for three days in January
Daegu Opera House — December, the stage area of the venue
From December 3 to 5, 2025, Daegu Opera House Stage Area Rooftop 626.2 ㎡ was constructed.
Leaking water on the stage of
venue directly damages the performance and equipment.
Cracked and excited urethane rooftop covered with panel after three days of .
Daegu Opera House Stage Area Before Construction — Split and Exciting Urethane Rooftop
After construction of Daegu Opera House stage area, — finished 626.2 ㎡ in three days
Hyundai Mipo Apartment — Five Days Over the Sun
Hyundai Mipo Apartment Beginning on December 29, 2023, and ending on January 2, 2024, It was construction.
It was a holiday weekend, but the construction was completed in five days according to the weather.
Before construction of Hyundai Mifo Apartment — Green Urethane Rooftop
After construction of Hyundai Mifo Apartment
Sihwa Plant — In January, a factory rooftop lined with facilities
Sihwa Plant From January 20 to February 3, 2024 It was constructed.
There were steel fixtures lined up on one side of the rooftop. The appliance has been finished by aligning the panels along the perimeter without moving them.
Before construction at Sihwa Plant — Urethane Paint Rooftop
sihwa factory, the — facility is left intact and the finish is
.
Cold-resistant waterproof layer or
winter construction is possible, its waterproof layer endures winter is a different story.
The
ROOFGUARD waterproof panel has undergone the following tests in accordance with KS standards:
- Pitcher's test after low-temperature treatment
Water did not seep in after 168 hours of treatment at minus 20°C. - Freeze-thawing Pitcher's test after 300 cycles
After 300 cycles of freezing and melting, water did not seep in. - Conjugation performance test after repetition of extreme temperature
The bonding performance of the joint was confirmed even after processing between 140 ℃ and minus 30 ℃.
COLD TEMPERATURE · Freeze-thawing · Summary of extreme temperature repeated test results
The panels are made of POSCO's high corrosion-resistant alloyed plated steel sheet (PosMAC 1.5), Fixed bracket and middle bracket contract with temperature · to hold the expansion work for which it is designed..
It is not a structure that freezes, melts repeatedly and splits like a film. 
Panel joint cross-section — bracket holds the panel and prevents deformation due to shrinkage · expansion with temperature
Winter is not the season for leaks.
While the snow melts and freezes repeatedly, the damage is rather large.
"Let's do it in the spring," before procrastinating, Is there a way to build it now? We encourage you to check it out first.
Owellsteel has been constructing apartments, government offices, and factory rooftops even in the middle of winter.
We'll take a look at the site conditions and weather to give you a timeline. Free on-site quote .
Rooftop Steel Waterproofing Co., Ltd. Owellsteel
- Main Phone: 1522-5582
- Email: owellsteel@naver.com
- Homepage: owellsteel.com