I need to use a bunch of this product this spring to patch up some holes in
my cabin where the carpentryship wasn't exact. I notice they have two
formulas, one expanding more than the other one.
Tips on usage appreciated.
In some places, the gap is up to an inch. Would I be better to poke
shredded fiberglass in there using a dowel as a poker, then seal it with
Great Stuff? Or even seal it with a nice shade of caulking? Or fill it
mostly with Great Stuff, then smooth or cut smooth, then caulk over for a
Probably going to use a couple of dozen cans in all. It depends on how much
I fill up with shredded glass first, or just use the foam for the entire
void. What would you do?
The big issues with "Great Stuff" are...
Wear gloves and clothes that you won't mind tossing when you're done. It is
near impossible to get off of skin and even harder to get out of fabric. Do not
be tempted to shape it like caulk. Let it harden and then "shave" excess off
with a razor knife.
The power of the expanding foam CAN damage stuff. Be conservative. It can
crack drywall and bow metal thresholds enough that the door rubs.
If you are really going to use large quantities, get into the
commercial size stuff.
This system requires that you have cleaner for the gun. The
advantage is that you do not use up the entire can. I buy the
door and window product to avoid collateral damages. Triple
expanding can be deadly depending on the situation.
A live Singing Valentine quartet,
There's three types - Cracks/Gaps in the red can, Big Gaps in the black can
and Doors/Windows in the blue can.
I've found if you fill a big area with the Big Gaps stuff (2" x 5" x 22") it
cures and then over the next couple of weeks shrinks and leaves an 1/8" -
1/4" gap all the way around. The Door/Windows version cures to a harder
skin than the Cracks/Gaps plus doesn't push very hard against things so I've
settled on that kind.
For air sealing, lay a bead down all the way in and let it expand. Put in
less than you think you need until you get the hang of how much it expands.
Put some insulation on top of that if you want after it cures.
For void filling, I've found the best bet is to fill as much as possible
with a piece of XPS foam board (the pink stuff at Home Depot). Cut a piece
so there is a 1/4" gap all the way around, put it in the gap and foam around
it. Nothing magic about the 1/4" number - that's the size of the dispensing
Comes off your skin easily with acetone. Of course, acetone isn't
particularly good for you so wear thin gloves if you got 'em. My work
clothes have paint, caulk and glue on them so I can't tell if I ever got any
GS on it.
When in doubt, read the instructions on the can.
If you are just going for air sealing
Yeah, I found a couple of partially used cans in the shed from the previous
owner, and no way to get any more out of that spout. I figured getting it
all ready and using whole cans start to finish. It is 7.2 miles down to the
hardware store from my cabin, not bad. The next settlement is 30 miles from
I'm ending up with a small hardware store up there, but every time I can go
scrounge something and save a trip to town, I have to high five the nearest
Since this is just an option question, I dislike "great stuff" I've
had much better results with the latex competitor. The stuff doesn't
over expand, and cleans off clothes.
As for a finish, I've heard people tooling it(razor scraper) after it
cures and painting the stuff.
BTW, for larger gaps you can use backer rod with caulk, instead of
tom @ www.BlankHelp.com
I think you are talking about the DAP product. I've used both. The DAP latex
material is a little softer and less dense than Great Stuff. Depending on what
you plan to put on top of the foam (if anything), Great Stuff provides a
slightly stronger base for material like plastic wood.
I would use backer rod if you want to confine where you squirt the
stuff. In the future you might want to check the expanding foam that
is latex based. It cleans up with soap and water, and can be painted
Just thinking out loud....
tom @ www.YourMoneyMakingIdeas.com
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