What Separates A Good Spray Foam Insulation Job From A Bad One
Good material sprayed badly is still a failed spray foam insulation job, and the failure looks identical to the homeowner: the foam shrinks, a smell will not go away, and it pulls back off the framing. None of that is the insulation's fault.
Three things decide it, and all three happen before anyone sees a finished wall. The two components have to meet in the right ratio, which means equipment that is maintained and monitored rather than assumed. The substrate has to be above the insulation's minimum temperature, measured at the surface and not at the room. And the depth has to be checked as it goes on, not estimated afterwards.
Ask any spray foam insulation contractor you are considering how they handle those three. The answer tells you more than anything on a website, including this one.
Buildings In This City Are Not Standard
A good deal of the housing here went up after the fire of 1877, when this was already a century-old port. That housing tends to be tall, narrow, close together, often balloon framed, and frequently built on a slope.
Those buildings have vertical air paths inside the walls running from the cellar to the roof, chimney chases that were never sealed, and foundations of stone or rubble that were never meant to be dry.
Then there is the bay. Roughly seventy days of fog a year keeps the outdoor air close to saturated for long stretches, which means every air leak is a moisture path as well as a heat loss, in whichever direction the air happens to be going that season.
Neither of those things is in a manufacturer's installation guide. They are the reason a specification written for an inland subdivision does not transfer here.
How We Price
We price everything in one visit. We measure, look at what is already in place, read the substrate temperature, and check where the damp actually is rather than where it is assumed to be.
Then we write one specification with the insulation, the depth and one figure on it. That figure does not move afterwards, and there is no charge for the estimate.
If spray foam insulation is the wrong answer we will tell you, even when the right answer is a smaller job than the one you called about. Air sealing a ceiling and topping up what is already up there is sometimes the honest recommendation, and we would rather give it than sell a job that does not earn its price.
What We Will Not Do
We will not quote an assembly R-value without stating the depth it assumes.
We will not spray over failed spray foam insulation, or over batt and loose fill.
We will not spray onto a substrate that is below the insulation's minimum temperature because the crew is already on site and it is inconvenient to come back.
We will not leave you to discover the covering requirement after the job is finished.