What is the R-rating on this?

Hi Dave! The initial R-value is 4.3 per inch and the aged R-value is 3.7. Good luck with your project!

Is closed or open cell foam?

Hi Meggi, This is a closed cell foam.

can this be used to fill holes between dry wall and hardwood, then covered with molding? Will the foam crack if a nail goes into it?

This is the perfect place to use this foam! I did this in my own home recently when we were installing new baseboard. You can apply the foam in the gap, and like others said be careful about overfilling because it does expand quite a lot. I also highly recommend buying our Cleaner / Amazon # B0002YWRG4 because you can spray this on a paper towel and clean up foam when it's still wet. It's a useful product for any project using GREAT STUFF foams. Don't worry if it puffs out too much, you can cut, sand, caulk or paint this foam once fully cured/dry. The foam will not crack if you nail through it but it also is not structural so you'll need to make sure you're nailing the molding into the wall. Good luck with your project!

is it safe around a hot baseboard heater pipe coming into the room through the floor?? thats where mice get into the rooms from under the floor

I looked at the can and it doesn't really say. The stuff before it cures is full of flammable gas but it doesn't say anything about keeping the cured material from heat. Now, that being said, (I'm putting on my professional chemist hat) Great Stuff is a polyurethane. And polyurethanes are flammable. So, I would be concerned if the area got very hot, say over 150F. Hope this helps.

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157911 Insulating Foam Sealant, 20 Ounce, Ivory

Product ID: 10613960

Details

Brand
Great Stuff
Item Weight
1.3 pounds
Item dimensions L x W x H
2.75 x 2.75 x
Material
Polyurethane
Style
Gaps & Cracks

💧Waterproof & moisture-resistant seal

🧱Expands to fill gaps up to 1 inch

🛠️20 oz can with precision straw applicator

$38.93

Duties & taxes included

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Sold byAmazon British Virgin IslandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛡️ Seal smart, save energy, and stay ahead of the draft game!

EFFORTLESS PRECISION - Straw applicator ensures easy, mess-free application in tight or hard-to-reach spaces.
SEAMLESS ENERGY SAVER - Creates airtight, moisture-proof seals that slash drafts and boost insulation.
DURABLE WEATHERPROOF - Polyurethane foam resists water and condensation, maintaining performance year-round.
VERSATILE IVORY FINISH - Blends naturally with most surfaces for a discreet, professional look indoors and out.
TRUSTED INDUSTRY STANDARD - Meets ASTM C-920 for reliable, long-lasting sealing performance.

Great Stuff 157911 is a 20-ounce polyurethane insulating foam sealant designed to fill gaps up to 1 inch, creating durable, waterproof, and airtight seals that improve energy efficiency and prevent drafts. Its ivory color blends seamlessly with most surfaces, making it ideal for both interior and exterior use. Equipped with a precision straw applicator, it offers easy, mess-free application and meets ASTM C-920 standards for professional-grade performance.

Specifications

ASIN	B0002YX98O
Best Sellers Rank	#6,957 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #15 in Industrial Joint Sealants
Brand Name	Great Stuff
Color	Ivory
Compatible Material	Polyurethane
Customer Reviews	4.5 4.5 out of 5 stars (1,907)
Global Trade Identification Number	00074985001567
Included Components	Expanding foam sealant
Item Dimensions	2.75 x 2.75 x 9.5 inches
Item Form	Foam
Item Type Name	Insulating Foam Sealant
Item Weight	1.3 pounds
Manufacturer	Great Stuff
Material Type	Polyurethane
Model	157911
Number of Items	1
Number of Packs	1
Part Number	157911
Style Name	Gaps & Cracks
Supported Standards	ASTM C-920
Surface Recommendation	Wood
UPC	074985001567
Unit Count	20 Ounce
Warranty Description	Warranty
Water Resistance Level	Waterproof

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