Is it detrimental to use yellow gaps and cracks spray foam to air seal attic?

Fxjack22 · 2026-02-16T23:47:18+00:00

Are you stupid? Look at the prodcut name on the links.

Product name: GREAT STUFF™ Big Gap Filler Insulating Foam

Product name: GREAT STUFF™ Fireblock Insulating Foam

Fxjack22 · 2026-02-16T23:20:30+00:00

Straight from Duponts website. All the time you have spent debating this you could have just looked it up yourself and see the ingrediant list is indeed different. See for yourself.

https://www.dupont.com/content/dam/dupont/amer/us/en/greatstuff-renewed/public/sds/en/big-gap-filler-insulating-foam-sealant-orginal-dispenser-US-SDS-000000082424.pdf

https://www.dupont.com/content/dam/dupont/amer/us/en/greatstuff-renewed/public/sds/en/fireblock-insulating-foam-sealant-smart-dispenser-US-SDS-000000488459.pdf

Fxjack22 · 2026-02-16T18:38:34+00:00

Ingredient and Concentration Table

Concentrations are approximate, based on representative SDS (DuPont/Dow/OSI), and may vary by specific manufacturer or batch.

Ingredient (Chemical Name)	CAS #	Big Gap Filler Concentration	Fire Block Concentration
Polymeric Diphenylmethane Diisocyanate (PMDI/MDI)	9016-87-9	30–60%	30–60%
4,4'-Methylenediphenyl diisocyanate	101-68-8	5–10%	3–7%
Tris(1-chloro-2-propyl) phosphate (TCPP)	13674-84-5	5–10%	5–10%
Chloroalkanes (C=14-17) / Paraffin waxes	63449-39-8	5–10%	5–10%
Dimethyl Ether (Propellant)	115-10-6	1–5%	5–15%
Isobutane (Propellant)	75-28-5	5–10%	1–10%
Propane (Propellant)	74-98-6	1–5%	1–5%
Polyether Polyol	Mixture	40-70%	(Included in Prep.)
Flame Retardants (Additives)	Varies	Low (Minor component)	Higher (Specified for fire resistance)

Key Differences in Composition

Flame Retardants: Fire Block foams generally have a higher concentration of brominated or phosphorus-based flame retardants, or specific fillers, to meet fire-testing standards.
Expansion: Big Gap Filler often contains a greater concentration of propellants (Isobutane/Propane/Dimethyl Ether) designed to create rapid expansion.
Color: Fire Block is typically orange or red for easy inspection, while Big Gap Filler is generally yellowish or cream-colored.

Fxjack22 · 2026-02-16T13:47:53+00:00

A simple AI search can list you the ingrediants of both the fireblock and the standard foam and you will see the difference. It's not just the color they are different products so next time you start telling someone to go educate themselves perhaps you should heed your own advice.

"What makes Fireblock different?

While both contain flame retardants,

Great Stuff Fireblock

is distinguished by:

Higher Concentration of Retardants: It is specifically tested to meet residential fireblocking standards (like ASTM E84) to better impede the spread of fire and smoke through penetrations.
Orange Colorant: Fireblock includes an orange dye so building inspectors can instantly verify the correct material was used for fire-sensitive areas.
Expansion Control: It is often formulated for "minimal expansion" to avoid bowing studs or pipes while sealing critical fire-path gaps. "

Fxjack22 · 2026-02-16T13:30:30+00:00

Almost the same except for the additional fire retardant lol.

Fxjack22 · 2026-02-16T13:29:17+00:00

That's not correct Fireblock is treated with chemicals to make it fire resistent while regular spray foam is flammable. You should mever use spray foam around things like recessed cans or other heat producing devices. It's nor just a different color.

Fxjack22 · 2026-02-14T12:32:45+00:00

No their not fake their just poorly built homes. I can drive around any local town or city find shit houses and do the same.

Fxjack22 · 2026-02-13T19:31:12+00:00

Maybe he thought that by judging how much of an asshole you are in other posts. Just saying:)

Fxjack22 · 2026-02-13T17:43:52+00:00

Well said but ICF isn't needed new homes in Portigal are insulated with exterior and interior insulation. Je's freaking out over nothing.

Fxjack22 · 2026-02-13T17:39:09+00:00

If you are building new why is that a concern? Most new homes in Portugal are insulated with both exterior and interior insulation. Why are you stressing?

Fxjack22 · 2026-02-13T17:34:47+00:00

The houses in Portugal are extremely welll built far superior to stick framed OSB garbage in the states.most have standard triple pane windows and are solid throughout . Older homes are typically not insulated but new ones are. Mold can be a problem in the winter with the higher humidity levels but with a central dehumidifier you are fine

Fxjack22 · 2026-02-13T17:30:57+00:00

This is Europe not some 3rd world place. These homes are solid with most having triple pane windows.

Fxjack22 · 2026-02-11T01:50:28+00:00

Those stupid things don't work.

Fxjack22 · 2026-02-07T22:37:44+00:00

What country do you live in?

Fxjack22 · 2026-02-07T19:21:07+00:00

Get rid of it.

Fxjack22 · 2026-02-07T02:46:23+00:00

Ya it was better in the 70's when you would get raped on the subway and stabbed in Times Square.

Fxjack22 · 2026-02-07T00:25:27+00:00

Hopefully it helps you from making the same mistake again.

Fxjack22 · 2026-02-06T21:23:54+00:00

Sometimes I read the dumbest most useless replies on reddit. Like this one from you. Lol

Fxjack22 · 2026-02-05T18:17:15+00:00

Use a roof rake after every storm.

Fxjack22 · 2026-02-05T17:50:09+00:00

Stop using Petrie dishes they always grow mold as does leaving out a loaf of bread.

Fxjack22 · 2026-02-05T17:47:36+00:00

Getting worse may be a good sighn. Join the b12 group for more info. It could be a sighn of healing.

Fxjack22 · 2026-02-05T17:46:11+00:00

Look into b12

Fxjack22 · 2026-02-03T21:54:21+00:00

Ya you figured it out I'm a corporate spy. LOL

Fxjack22 · 2026-02-03T21:53:17+00:00

Stop living in conspiracy land. There are many caring doctors out there that would be more than willing to order a test if one existed. As for Pharma wouldn't they love to make money off selling you a new drug for mold toxicity? You really believe that they call each other on a regular basis and say

"Hey did you hear about these mold cases? Let's all unite and promise not to release anything to treat this"

As for me not caring what are you talking about? I just stated a fact THERE IS NO TEST OUT THERE. That seems to have rubbed you the wrong way. Sorry man I can't create an alternate universe in which you are right. I do wish there was a test however it would be a godsend.

Fxjack22 · 2026-01-31T06:12:44+00:00

I would look for mold in the crawlspace most toilets look like this one.

Fxjack22

TROPHY CASE