R-value
The insulation layer moves from the attic floor to the roof deck.
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Roof-deck attic insulation
Spray Foam Attic Insulation
A different approach to insulating and air-sealing your attic.
Open-cell spray foam applied at the underside of the roof deck can create an unvented attic assembly when the roof, moisture, mechanical, exhaust, and conditioning requirements are suitable.
A different attic assembly
From a vented attic to an unvented roof-deck space.
The conversion relocates the thermal and air-control boundary from the attic floor to the roof deck. It is an attic-system decision—not simply a premium material upgrade.
Conventional vented attic
Insulation and primary air control remain at the attic floor.
Unvented roof-deck attic
Insulation and air control move to the underside of the roof deck.
A clear process
A clear process. Documented work.
The roof, moisture, ventilation, equipment, exhaust, and conditioning context are evaluated before the defined assembly is installed.
- 1
Evaluate
Assess suitability and existing attic conditions.
- 2
Protect
Protect the home during preparation and installation.
- 3
Remove
Remove attic-floor insulation for the defined conversion.
- 4
Apply foam
Install appropriate open-cell foam at the roof deck.
- 5
Inspect
Check coverage, depth, and key assembly details.
- 6
Verify
Document completed work and remaining requirements.
Real project photography
See the conditions. See the work.
Selected field images show the conditions, installation details, and completed work relevant to this service.
Condition-dependent fit
This approach may make sense when:
- A roofline conversion serves the project objective.
- The roof and attic assembly are suitable.
- HVAC, moisture, and conditioning requirements can be addressed.
- You understand attic-floor insulation is removed for the defined conversion.
Important to understand:
- Unvented does not automatically mean conditioned.
- Combustion appliances and exhaust systems require evaluation.
- Code, ignition, fire, thickness, and roof requirements are project-specific.
- Spray foam is not automatically superior to a properly detailed fiberglass system.
Four factors. One effective attic assembly.
The insulation scope is only one part of performance.
Spray foam moves the control layer, so insulation, air control, moisture, and conditioning must work as one assembly.
Air sealing
A continuous roof-deck application becomes part of the air-control strategy.
Radiant control
Roofline heat flow is addressed by the selected roof-deck assembly, not a universal add-on.
Moisture & conditioning
An unvented attic requires project-specific moisture and conditioning decisions.
Start with the attic
Start with a free attic inspection.
Tell us what you are noticing. We will follow up to arrange an inspection and discuss the scope that fits the observed conditions.