Most helpful positive review
69 of 70 people found the following review helpful
Great Stuff Pro is the real thing
on January 17, 2012
Hi, in addition to being a homeowner DIYer, I have several BPI certifications and teach residential and commercial energy conservation, which includes air sealing and insulation. If you are considering using mono-component foam for more than one very small job, be aware of a few related facts. Firstly, mono-component spray foam expands very little, no matter what kind you buy. If you need more expansion, you have to get a bi-component product such as Tiger Foam (to spray wall cavities or rim/band joists). Secondly, the spray bottles you buy at the Home Depot should be used all at once and not stored for a long time before using or they get clogged. This is true even for the ones rated "reusable". Thirdly, these products are typically not fire-rated. Dow Great Stuff Pro needs its own dispenser gun. You can get the least expensive of the 3 which costs around $30 and will last you a long time if used correctly. Hence, this product is more expensive at the beginning but it has the following advantages: the foam is fire-rated; MUCH better dispensing control in terms of bead size and consistency; no overspraying when you release the trigger; the same bottle can officially stay on the gun for 1 month but users report that they are having no problems after 6 months. Two final points: spray foam is the best air sealer and insulation on the market but is expensive. For larger jobs such as open wall cavities, consider laying down no more than 1" of foam first and then adding much less expensive bat insulation on top of it. Do not underestimate how wickedly sticky this stuff is. DO NOT get it on your (good) clothing, skin, hair, glasses, etc or else. I found that Amazon is the right place to get foam and gun in terms of price and availability.
This foam cures with the moisture in the air. In dry weather, moist (not soak) the cavity you want to fill with a light spray of water before applying the foam. You will get twice as much expansion and no voids.