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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Gaps & Cracks 20 oz Insulating Foam Sealant

Gaps & Cracks 20 oz Insulating Foam Sealant

Product ID: 81431292

Details

Brand
GREAT STUFF
Item dimensions L x W x H
7 x 7 x 24.1
Item weight
20 Ounces
Material
foam
Style
Compact

💨Waterproof & airtight seal

🔥Flammable aerosol, handle with care

🧱Expands to fill gaps up to 1 inch

HK$903

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Description

🛠️ Seal smart, save energy, and never let a crack cramp your style!

COMPACT POWERHOUSE - 20 oz can delivers 591 ml of high-performance foam, perfect for multiple projects without constant refills.
TRUSTED INDUSTRY STANDARD - Meets ASTM C-920 standards, giving you professional-grade reliability and durability.
BUILT TO WEATHER THE STORM - Waterproof and airtight formula locks out moisture and air, boosting your home's energy efficiency.
SEAL EVERY CRACK LIKE A PRO - Expands on contact to fill gaps and cracks up to 1 inch wide, ensuring no draft or pest gets through.
VERSATILE SURFACE COMPATIBILITY - Works seamlessly on walls, sinks, tiles, and floors—your all-in-one sealing solution.

GREAT STUFF Gaps & Cracks 20 oz Insulating Foam Sealant is a professional-grade expanding foam designed to fill and seal gaps up to 1 inch wide. Waterproof and airtight, it enhances energy efficiency and blocks moisture, air, and pests. Compact and versatile, it meets ASTM C-920 standards and works on multiple surfaces including walls, sinks, tiles, and floors.

Specifications

ASIN	B0002YX98O
Best Sellers Rank	775,576 in DIY & Tools ( See Top 100 in DIY & Tools ) 6,265 in Sealers
Brand	GREAT STUFF
Colour	Multicolor
Compatible Material	Glass
Customer Reviews	4.5 4.5 out of 5 stars (1,811)
Global Trade Identification Number	00074985001567
Included Components	Expanding foam sealant
Item Dimensions	7 x 7 x 24.1 centimetres
Item Form	Foam
Item Weight	20 Ounces
Manufacturer	Great Stuff
Manufacturer Part Number	157911
Material	foam
Model Number	157911
Number of Items	1
Number of Packs	1
Style Name	Compact
Supported Standards	ASTM C-920
Surface Recommendation	[At least some of: Wall, Sink, Tile, Floor]
UPC	074985001567
Unit Count	591.47 millilitre
Water Resistance Level	Waterproof

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HK$903

Duties & taxes included

In stock

Sold byAmazon Hong KongDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Hong Kong.

Secure transaction

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