Open Cell Spray Foam Insulation in Cape Coral, FL
A light-density, highly expansive polyurethane foam engineered to fill deep framing cavities, seal air leaks, and dampen airborne sound. The most popular choice for Cape Coral residential attic roof decks.
What Is Open Cell Spray Foam?
Direct Answer: Open cell spray foam (typically nominal 0.5 lb/cu.ft. density) is a low-density polyurethane foam with interconnected, pliable cellular walls. Upon application, it expands rapidly up to 100 times its original liquid volume, forming an airtight, sponge-like matrix that seals framing gaps and provides dependable thermal resistance of approximately R-3.6 to R-3.8 per inch.
Because open cell foam expands so substantially, it can completely fill the depth of standard 2x6 or 2x8 roof rafters in a single or double pass. This high yield makes open-cell foam a very cost-effective solution for large attic roof deck assemblies across Southwest Florida.
Unlike dense closed cell foams which are rigid, open cell foam remains slightly flexible. This flexibility allows it to accommodate subtle thermal expansion and settling of roof trusses and framing lumber without shearing away from the wood sheathing.
Where Can Open Cell Foam Be Used?
Open cell foam is engineered for interior building assemblies where full cavity fill and sound reduction are beneficial.
Unvented Attic Roof Decks
Applied directly to the underside of plywood or OSB roof decking to isolate attic ductwork from exterior heat.
Interior Acoustic Partitions
Installed in interior walls between bedrooms, bathrooms, laundry rooms, and home theaters for sound control.
Cathedral Ceilings
Provides continuous air sealing between rafters in high vaulted living rooms common in Cape Coral homes.
Open Cell vs. Closed Cell Spray Foam
Both materials provide continuous air sealing, but their physical structure dictates their ideal use cases.
Open Cell Characteristics
- • Cost per Board Foot: More economical raw material yield for deep attic cavities.
- • Sound Absorption: Open cell matrix dissipates sound waves effectively.
- • Vapor Permeability: Permeable; allows moisture detection if a roof leak occurs above.
- • Flexibility: Moves naturally with seasonal roof truss deflection.
Closed Cell Alternative
- • R-Value Density: Approx R-6.5 to R-7.0 per inch (requires less depth).
- • Moisture Impermeability: Resists liquid water and acts as vapor retarder.
- • Structural Rack Strength: Hardened density adds racking rigidity to walls.
- • Shallow Cavity Fit: Best for 2x4 framing and masonry walls.
Open Cell Spray Foam Installation Near Cape Coral
Applying open cell foam requires precise ambient temperature monitoring, chemical proportioning ratios, and thorough ventilation during application.
We check roof decking moisture levels to ensure the wood substrate is completely dry before spraying.
Foam is sprayed in controlled passes to build the appropriate R-value depth specified for the attic assembly.
Where required by local Florida building code for storage attics, ignition or thermal barrier coatings are applied.
Open Cell Spray Foam FAQs
Direct technical answers to common questions about open cell insulation.
Request an Open Cell Spray Foam Estimate
Get in touch with Cape Coral Spray Foam Installation to discuss whether open cell is the right choice for your attic or framing project.