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Your home. Better understood.

A better-insulated home starts here.

Know where spray foam fits, what to check first, and when another approach makes more sense.

Plan my project New to spray foam? Start here
For homeowners & working prosFree tools. No account needed.
Conceptual cutaway model of a two-story home with an attic, exposed wall framing, floor framing, and a full-height basement.EXPLORE YOUR HOME01Attic & roof02Exterior walls03Interior walls04Rim joists05Basement walls
One home. Connected decisions.Concept illustration. The lines identify the part of the building each guide covers.
Good decisions start with good sources.
U.S. Department of EnergyEPABuilding America
How we research

Whole-Home Lab · decision model

Move the boundary. See what changes.

Choose a location and the main goal. The lab exposes the first question, the access reality and the right guide before a product enters the conversation.

mapped applications
23
project lenses
5
accounts required
0
01
Enclosure boundary

Attic floor

Keep a vented attic outside the conditioned enclosure by aligning ceiling air control and insulation.

Location
Above the top-story ceiling
First check
Roof leaks, recessed fixtures, flues, attic access, ducts, and the existing ceiling air barrier.
Access and inspection
Open attic access; ceiling penetrations still need inspection.
Open this area guide Take it to the planner

Explore all 23 mapped areas, from the attic to mechanical systems and exterior applications.

Open the full lab

01 / Choose your starting point

What do you need to decide?

Choose the job in front of you. Each path keeps the building, safety, and evidence questions ahead of product shopping.

01

I’m planning a project

Map the assembly, unknowns, and stop points before choosing a material.

Build my project path
02

I’m seeing a problem

Start with the symptom, preserve useful evidence, and know when to stop.

Find the problem guide
03

I’m comparing a material or format

Compare choices under the same conditions, with no universal winner.

Open comparisons

02 / Start with the assembly

Six common places to begin.

Similar-looking spaces can need different insulation details. Choose a location, check what it separates, and explore all 23 application areas.

View all 23 applications
Enclosure boundary

Attic floor

Keep a vented attic outside the conditioned enclosure by aligning ceiling air control and insulation.

Read the guide
Enclosure boundary

Exterior walls

Wall insulation has to work with cladding, drainage, sheathing, air control, vapor control, and drying.

Read the guide
Local connection

Rim joists

The visible rim cavity is only part of a perimeter connection that may include sill, masonry, framing, and services.

Read the guide
Enclosure boundary

Crawl spaces

Choose whether the boundary follows the floor or foundation walls, then coordinate ground moisture and water management.

Read the guide
Local connection

Windows, doors, and small gaps

Small air-sealing products have defined joint sizes, movement limits, substrates, and locations. Exterior drainage remains separate.

Read the guide
Special boundary

HVAC and mechanical systems

Duct sealing, insulation, encapsulation, enclosure work, equipment safety, and commissioning remain distinct scopes.

Read the guide

Your project, in order

Five questions before the first can.

Build your project plan
  1. 01

    Where are you working?

    Start with the attic, wall, garage, shed, or measured joint.

    Choose the project
  2. 02

    What will it cost?

    Put quotes on the same area, depth, units, and finished scope.

    Compare the price units
  3. 03

    What do you need?

    Match the material, dispenser, and documents to the task.

    Choose the format
  4. 04

    How should it be done?

    Check surfaces, conditions, access, and the exact instructions.

    Check readiness
  5. 05

    How long will it take?

    Separate setup, application, cure, access, and finishing.

    Plan the stages

03 / Make a plan

Plan the work. Measure the scope. Keep the record.

Turn what you know about your project into a useful plan. Use it on site or when you talk with your contractor.

Open the project planner Private by design. Your answers stay in your browser.
01

Project planner

Seven questions. A focused route through your project.

02

Board-foot calculator

Measure each surface. See the total without hiding assumptions.

03

Bid scope comparison

Compare three proposals against the same 16 decisions.

04

Project Binder

Keep your project path, takeoff, bids, and closeout records together.

Built for real projectsExplore all tools →

04 / Understand the why

Three field guides to start with.

The guide library

CHOOSE THE RIGHT FORMAT

Which foam belongs where?

See how general gap, window and door, and pest-block foams overlap, then match the formulation and dispenser to the job.

Read the guide

BUILDING SCIENCE, SIMPLIFIED

Air and vapor aren’t the same thing.

Two kinds of movement that call for different control layers.

Read the guide

KNOW YOUR SCOPE

When does the job need a pro?

The questions to ask before you open a can or accept a quote.

Read the guide

Something doesn’t seem right?

Start with what you’re noticing.

Understand the symptom, what to document, and when to bring in help.

All troubleshooting guides
A smell that won’t go away Foam that feels sticky or oily Gaps or foam pulling away Dampness or condensation

The Spray Foam Guides approach

Practical guidance with evidence and limits.

See what supports each recommendation and how it applies to your home.

Get to know the publication →
01

Sources you can follow

Primary documents, visible source-check dates, and an honest review status on every guide.

02

The whole home comes first

Moisture, air movement, safety, and other materials belong in the conversation.

03

A clear line between guidance and shopping

We explain the project and identify relevant product examples. Our sister publication, Best Spray Foam, maintains the product research. We share ownership; store links go directly to the retailer.

78 practical guides · 5 free planning tools · One better-informed next stepFind your answer