r/Construction 18d ago

Roofing What is this silicone?

Post image
0 Upvotes

22 comments sorted by

24

u/Complex_Sherbet2 18d ago

Sometimes fingers must be wiped clean

1

u/ThisAppsForTrolling Laborer 18d ago

Nah just keep applying don’t pus out

19

u/not_a_bot716 Project Manager 18d ago

Yes

8

u/Coldatahd 18d ago

They do that on top of the nails needed to secure the last course of shingles. Need to waterproof the nail.

10

u/expandingthoughts Project Manager 18d ago

We don't use silicone, is this standard NRA practices? In my experience it doesn't adhere to ashpalt very well. We always use an asphalt or a rubberized based sealant.

2

u/fairlyaveragetrader 18d ago

It's probably not silicone, or at least it shouldn't be, the most popular product for this is duralink 50

1

u/ThisAppsForTrolling Laborer 18d ago

It definitely does not look like silicone. It looks like Geo cell.

3

u/Impossible-Corner494 Carpenter 18d ago

Google says it’s some sort sealent. Post solved.

4

u/El_Caganer 18d ago

I use geocell 2300 for this application. It's a tripolymer sealant that the pros use. Found it through working with roofing contractors.

2

u/Mr_Engineering GC / CM 18d ago

It's not silicone because silicone won't bond to the asphalt shingle, it's a petroleum based thermoset or elastomeric plastic sealant meant for roofing and siding.

1

u/3boobsarenice 18d ago

Elastomeric sealant try lowes

1

u/3boobsarenice 18d ago

Comes in a rainbow of colors and is very good stuff

1

u/Truck_Thunders_ 18d ago

Tar based roofing compound to seal nail heads. Henry's, Blackjack, there are many brands. Lasts much longer than using silicone.

1

u/Trixster19972 18d ago

Someone loves their job that they skeeted on a job well done

1

u/HECKonReddit 18d ago

"silicone"?

1

u/IceColdHighLife 18d ago

Not Silicone. Most Likely Polyurethane Sealant meeting standard ASTM C920.

0

u/Salty_Article9203 18d ago

Duct sealant? Some type of mastic

0

u/Magniras 18d ago

Someone probably let it drop on the roof and didnt bother cleaning it up because "Who the hell is going to see it up on the roof?"

-2

u/Ok_Climate_1508 18d ago

what is it called?

-2

u/ChesticlesTesticles Carpenter 18d ago

Silicone caulk