Batt Insulation (Fiberglass & Rockwool)

Name: OTS Chicago Insulation
Address: 1275 Rand Rd, Des Plaines, IL, 60016, US
Telephone: (855) 511-5652

Pre-cut batt insulation installed correctly — at the right thickness, with no gaps, and no compression — is one of the most reliable thermal solutions available for open-wall renovation and new construction projects across the Chicago area.

Batt insulation is one of the most widely used insulation products available, and also one of the most commonly installed incorrectly. Pre-cut fiberglass or rockwool panels fitted between wall studs and floor joists sound straightforward — and they are, when installed by someone who understands that performance is determined entirely by how the material is handled. Compressed batts lose R-value in direct proportion to how much they are compressed. Batts with gaps at the edges, around outlets, or at structural obstructions allow cold air to bypass the insulation entirely. Batts installed in the wrong cavity depth deliver less R-value than the label states. Getting batt insulation right means understanding these failure points and avoiding every one of them on every cavity — which is what we do on every batt insulation job we take on.

The choice between fiberglass and rockwool batts depends on the application, the performance goals, and what the space requires. Fiberglass batts are widely available, cost-effective, and perform well in standard wall and attic floor applications where moisture exposure is limited and the primary goal is thermal performance at the target R-value. Rockwool — also called mineral wool — is denser, more dimensionally stable, and significantly better for applications where fire resistance, acoustic performance, or moisture resistance alongside thermal performance is needed. Rockwool does not compress under its own weight, does not absorb moisture, and maintains its rated R-value more consistently over time than fiberglass in conditions where settling or moisture exposure is a factor.

Open-wall renovation projects, new construction, basement finishing, and any project where wall cavities are accessible before drywall goes up are all well suited to batt insulation — particularly when the work is done in sequence with air sealing before the insulation goes in and drywall immediately after. Homeowners across Des Plaines, Wheaton, Naperville, Glen Ellyn, and the wider Chicago metro who are mid-renovation or building new have a straightforward opportunity to get the insulation right from the start rather than addressing it later through drill and fill or blown-in methods. Contact OTS Chicago Insulation for a free estimate and find out whether fiberglass or rockwool batts are the right choice for your specific project.

What We Offer:

Fiberglass Batt Insulation — Pre-cut fiberglass batt panels installed between wall studs, floor joists, and ceiling framing in open-wall renovation and new construction applications. We install fiberglass batts at the correct thickness for the target R-value with full coverage across each cavity — no compression, no gaps, no shortcuts at edges or obstructions.
Rockwool Batt Insulation — Rockwool mineral wool batts installed in wall cavities, floors, and ceilings where thermal performance, fire resistance, and acoustic control are all relevant to the project. Rockwool is dimensionally stable, moisture resistant, and maintains its rated R-value over time without the settling or compression that affects fiberglass in some applications.
Exterior Wall Batt Installation — Batt insulation in exterior wall cavities during renovation or new construction creates the primary thermal barrier between the conditioned interior and the outside. We install to the correct R-value for the wall assembly depth and Illinois climate requirements with air sealing at all penetrations before the batts go in.
Interior Wall Batt Installation for Acoustics — Interior walls between rooms, floors, and mechanical spaces benefit from rockwool batt insulation where acoustic performance is a goal alongside thermal separation. We install rockwool in interior wall cavities at the density needed to deliver measurable noise reduction between adjacent spaces.
Floor Joist Batt Insulation — Batt insulation between floor joists above crawl spaces, garages, and unconditioned spaces stops cold air transfer from below and improves floor temperature in the living space above. We install at the correct R-value for the floor assembly and secure the batts properly so they stay in position over time.
Attic Floor Batt Insulation — In attics with accessible floor framing, batt insulation between the joists is a practical solution for new construction and renovation projects where the attic floor is open and accessible. We install to the correct depth for the target R-value and air seal penetrations before the batts go in.
Air Sealing Before Batt Installation — Air sealing all penetrations, gaps, and bypasses in the wall or floor assembly before batt insulation is installed is a standard part of every batt insulation project we complete. Batts installed over unsealed gaps allow air to bypass the insulation — air sealing first is what makes the installed R-value perform at its rated level.

Why Choose OTS Chicago Insulation for Batt Insulation (Fiberglass & Rockwool)

Installed Without Compression or Gaps — Batt insulation performance drops significantly when the material is compressed or installed with gaps at edges and obstructions. We install every batt at the correct thickness for the cavity depth, trimmed to fit around obstructions without compression, and fitted fully to the edges of each cavity on every job.
Right Product for the Application — Fiberglass and rockwool perform differently in different applications. We assess the project requirements — thermal performance goals, moisture exposure, acoustic needs, and fire resistance requirements — and recommend the product that fits the application rather than defaulting to the least expensive option regardless of suitability.
Rockwool Expertise — Rockwool is a premium product that delivers premium results when installed correctly. We have the experience to install rockwool batts at the density and coverage that delivers on its thermal, acoustic, and fire resistance ratings — which requires more care and attention than standard fiberglass installation.
Air Sealing Integrated Before Installation — Batt insulation installed over unsealed penetrations and gaps never performs at its rated value. We treat air sealing as an integrated part of every batt insulation project — completed before the batts go in so the finished assembly performs correctly from day one.
Chicago New Construction and Renovation Experience — Open-wall renovation projects and new construction across Des Plaines, Wheaton, Naperville, Glen Ellyn, and the Chicago metro each have specific wall assembly configurations and R-value requirements. We bring that local knowledge to every batt insulation project and install to the standard that the Illinois climate actually demands.