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How thick should spray foam insulation be sprayed?

Updated: 01/04/2016
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Answer: It depends on the application. Most attics/ roof decks get 5 inched of open cell while most walls get about 3 _ 3 ¹/2 for open cell . If it's closed cell you typical get about 2 inch .
Poly Energy
Answer: Depends on use area
S&B Property Inspections LLC
Answer: 6 inches
Michael J West Dreamkeeper Home Inspections Inc
Answer: Per inch and is usually sprayed between 2 to 3 inches thick resulting in an r value 14-21
Pinkerton Inspection Agency LLC
Answer: There are many variables to the thickness it should be.
Mountain View Inspection Services
Answer: Spray foam insulation should be a maximum of 5 and 1/2 inches.
Answer: 14 to 16 inches thick in the rafters.
Heritage Inspectors
Answer: That would depend on where it is located and the brand and chemical makeup of the insulation.
Moran Property Inspections
Answer: 2 to 4 in.
Professional Home Inspections
Answer: Normally the insulation depth is about the same as wall thickness.
Kairos Home Inspections
Answer: As thick as it should be to properly seal.
Royalty Home Solutions, Inc
Answer: Depends on the R-value you should spray up to an R30 for walls
Able Home Inspections
Answer: not sure
Thomas Property Services llc
Answer: 2"
Allied Services Home Inspection
Answer: As needed to Revalue need and depth of lumber.
Millyard Home Inspection
Answer: As thick as the rafter valley
Ray Inspection Services Corp
Answer: Thick enough to fill the void.
Brewer Contract Consulting
Answer: 2-4"
Anthony Quarato home inspections
Answer: Depends on the manufacturers directions.
Best Choice Inspections
Answer: Depends on location & Applicatin
KJ Wood Home Inspections
Answer: 3 to 5 inches
At Ease Home Inspection
Answer: Follow manufactures instructions.
Home Inspection Solutions
Answer: Depending on areas, attic or walls. Attic 14 to 16" for a good r-rating
Answer: It should be applied to the proper thickness per R-value guidelines.
J. Michael Simon, LLC
Answer: This question is too relative to answer accurately. It depends on the space being filled and the application. Also, even the foam type that is designed to expand less for door and window application, does expand some, so care should be taken.
Nicholas Home Inspection & Maintenance, Inc.
Answer: 2 inches
Answer: Read manufacturer label
A Better Choice Home Inspection, Co
Answer: Proper thickness per Code R-value requirements.
Epoch Property Inspections
Answer: refer to the manufacturer's specifications
A Balance Home Inspection
Answer: Usually sprayed between 2 to 3 inches thick resulting in an R-value between 14 and 21.
Eagles Eye Home Inspection,LLC
Answer: depending on the desired R-Value
Thomas Property Services
Answer: Open-cell foam reaches a point of diminishing returns at around 5" That threshold is even lower for closed-cell foam, which experiences diminishing returns at around 3" or 4”
NH Roof Consulting & Inspection
Answer: For code: 3" in walls and 7" in ceilings or cathedral ceilings (Maine Code)
Weather Seal Spray Foam Solutions
Answer: depends
OnSite Home Inspection, LLC
Answer: 6-8 inch
All Season Home Inspections
Answer: 6 to 12 inches
Superior Home Inspection Services LLC
Answer: 3-4 inches
G M M Property Inspections
Answer: Unknowed
MJL Home Inspectors
Answer: The R-Value is dependent upon coverage and thickness of material used.
Certipro Home Inspections
Answer: 3 inches in exterior walls and about 7 inches in attics
Smith Insulation
Answer: No more than 6'
Answer: it depends on where the spray foam is being used.
JKM Home Inspections
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