Board Insulation

Board insulation delivers reliable thermal performance in a rigid, easy‑to‑handle panel, helping cut energy bills, reduce drafts, and boost comfort in new builds and retrofits. Use it on exterior walls as continuous insulation to reduce thermal bridging, on basement walls and rim joists to combat moisture and cold spots, and on roofs or floors for consistent R‑values.

Common types and where they shine:
- Polyisocyanurate (polyiso): highest R‑value per inch; great for roofs and exterior sheathing. Foil‑faced options can act as a radiant barrier with an air gap.
- XPS insulation: strong, moisture‑resistant rigid foam suited for below‑grade, slabs, and foundation walls.
- EPS foam board: cost‑effective, good for walls and under slab; available in higher perm ratings to let assemblies dry.
- Mineral wool board: noncombustible, sound‑damping, and vapor‑open; ideal where fire resistance and drying are priorities.

Plan by climate and location. Match thickness to target R‑value, account for moisture exposure, and confirm fire ratings. Most foam boards must be covered with a thermal barrier (often 1/2 in drywall) in occupied spaces—check local code.

Helpful tools and accessories:
- Measuring tape, straightedge, marker
- Utility knife or insulation saw; hot‑knife for clean foam cuts
- Foam‑safe construction adhesive
- Cap nails or screws with insulation washers; furring strips for cladding
- Sealing tapes compatible with foil or foam facers
- Low‑expansion spray foam or sealant for edges and penetrations
- PPE: gloves, eye protection, and a dust mask

Installation tips for best results:
- Stagger seams and keep panels tight to limit air leakage.
- Tape all joints and flash transitions to connect the air barrier.
- Use foam‑safe adhesives; solvents can damage rigid foam.
- Provide a drainage plane and maintain ventilation clearances where required.
- Protect exposed foam from UV and physical damage.

Whether you’re insulating basements, garages, attic knee walls, or creating continuous exterior insulation, board insulation offers durable performance, higher R‑values per inch, improved moisture control, and faster, cleaner installs.