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-   -   Fire Taping In Cold Weather (https://www.contractortalk.com/f49/fire-taping-cold-weather-414681/)

mrcat 01-08-2019 03:36 PM

Fire Taping In Cold Weather
 
So I have about 48' of drywall seams that need to be fire taped Thursday before we can frame a garage.

Temps Thursday morning are starting out in the low 20's (Fahrenheit for you Canucks :laughing:) and falling into the teens by night.

Can I put the drywall up, put some plastic up, and run a heater under there for a hour and a half or so and use 20 min mud, then start framing in the afternoon? How long does the hot mud need to be kept above freezing?

I was going to use this stuff, https://www.amazon.com/EZ-Taping-Sys...ire+tape&psc=1 but then saw on the label it needs to be a minimum of 50 degrees to be installed...

Tinstaafl 01-08-2019 06:42 PM

One thing to keep in mind is that while hot mud hardens quickly, the full curing process takes much longer. Just how long, I dunno--but I bet it's more than a couple of hours.

Big Johnson 01-08-2019 07:23 PM

In cold weather during gypsum panel joint finishing, a minimum surface, water, mix and air temperature of 45 °F must be maintained until joints are completely dry. Adequate ventilation shall be provided to carry off excess moisture.


https://www.usg.com/content/dam/USG_...ittal-J17A.pdf


In my experience even 5 minute can take overnight to fully dry, depending on thickness. A thin coat under tape is probably at least 8 hours at 50°

SmallTownGuy 01-08-2019 07:27 PM

yup. Water isn't gonna evaporate any faster just because the mud has set.

hdavis 01-08-2019 08:43 PM

If the tape just needs to be stuck onto a 50F surface, I'd probably try a seaming iron or a heat gun.

mrcat 01-08-2019 10:34 PM

Thanks guys.

I'm thinking I'll go with the ez tape stuff, tarp the wall, and run the space heater under there for a couple hours while we are framing the garage walls, then stick the tape on, and start setting trusses.


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MarkJames 01-08-2019 10:39 PM

I'm guessing it wouldn't hurt to store the tape on a warm dashboard, etc.

mrcat 01-08-2019 11:29 PM

Quote:

Originally Posted by MarkJames (Post 7450725)
I'm guessing it wouldn't hurt to store the tape on a warm dashboard, etc.

Yup, I've got a couple warm boxes in the trailer for the battery chargers, it'll be in one of those. [emoji106]

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artinall 01-14-2019 03:01 PM

Quote:

Originally Posted by Big Johnson (Post 7450447)
...In my experience even 5 minute can take overnight to fully dry, depending on thickness. A thin coat under tape is probably at least 8 hours at 50°

Whoever came up with those minute ratings must have been a politician-in-training.

They often take multiples of stated time periods. Even in low humidity, proper mix, mid-to-high ambient temps

Big Johnson 01-14-2019 06:26 PM

Quote:

Originally Posted by artinall (Post 7454799)
Whoever came up with those minute ratings must have been a politician-in-training.

They often take multiples of stated time periods. Even in low humidity, proper mix, mid-to-high ambient temps

It’s the amount of time before they can be top coated. I still wouldn’t top coat anything after only 5 minutes.

blacktop 01-17-2019 10:59 AM

Quote:

Originally Posted by Tinstaafl (Post 7450405)
One thing to keep in mind is that while hot mud hardens quickly, the full curing process takes much longer. Just how long, I dunno--but I bet it's more than a couple of hours.

Ive seen heavily coated beads with 20 min take days to cure . With proper heat.

mrcat 01-17-2019 06:21 PM

Just to follow up on this, I ended up setting the last truss 1 1/2" away from the house, and once the garage was closed in, tarped off the first 8' and ran the space heater in there for a couple hours, and stuck the ez tape on.
Worked pretty good.

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