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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Great Stuff 157911 Insulating Foam Sealant, 20 Ounce, Ivory

Product ID: 10613960

Details

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

💨Creates airtight, moisture-resistant seal

🧱Expands to fill gaps up to 1 inch

🛠️20 oz can with precision straw applicator

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¥6035

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛡️ Seal smart, save energy, and never let a draft cramp your style!

SLEEK IVORY FINISH - Blends naturally with most surfaces for a clean, professional look indoors and out.
SEAL EVERY CRACK LIKE A PRO - Expands seamlessly to fill and insulate gaps up to 1 inch, blocking drafts and moisture.
BUILT TO LAST RAIN OR SHINE - Waterproof polyurethane formula ensures long-lasting protection against air and moisture.
ENERGY EFFICIENCY GAME CHANGER - Creates a durable, airtight barrier that slashes energy loss and keeps your space cozy.
EFFORTLESS PRECISION APPLICATION - Comes with a straw applicator for smooth, mess-free use in tight or hard-to-reach spots.

Great Stuff 157911 Insulating Foam Sealant is a 20-ounce polyurethane foam that expands to fill gaps up to 1 inch, creating an airtight, moisture-resistant seal. Designed for both interior and exterior use, it improves energy efficiency by preventing drafts and condensation. The included straw applicator ensures precise, easy application, while its ivory color blends seamlessly with most surfaces. Waterproof and durable, this foam sealant is a trusted solution for professional-grade insulation and air sealing.

Specifications

ASIN	B0002YX98O
Best Sellers Rank	#2,243 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #4 in Industrial Joint Sealants
Brand Name	Great Stuff
Color	Ivory
Compatible Material	Polyurethane
Customer Reviews	4.5 4.5 out of 5 stars (1,892)
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	20 Ounces
Manufacturer	Great Stuff
Material Type	Polyurethane
Model	157911
Number of Items	1
Part Number	157911
Style Name	Gaps & Cracks
Supported Standards	ASTM C-920
Surface Recommendation	Wood
UPC	074985001567
Unit Count	20.0 Ounce
Warranty Description	Warranty
Water Resistance Level	Waterproof

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