What R-value does the 5-inch board give?

At 4.3 per inch, a 5-inch board is about R-21.5. Check the assembly's total R-value, since fasteners and framing reduce it.

Is CurtainRock 40 fire rated?

The stone wool is noncombustible with a melting point near 2150°F. The foil facings and any adhesives or sealants in the assembly have their own ratings, so confirm the full system.

Can I use it in a house?

It is designed for commercial curtain wall systems and exterior walls. It can work in residential exterior walls, but the foil facings and density make it overkill for most interior partitions.

How many boards come in a pack?

A pack covers 40 sq ft. With 24" x 48" boards at 8 sq ft each, that is 5 boards per pack.

Boards are cut to fit and held with mechanical fasteners, then seams and penetrations are sealed with foil tape. Follow the curtain wall manufacturer's details for the assembly.

Rockwool Foil Faced CurtainRock 40 24" x 48" 5 in

Last price we saw

$128.44at Arbor, last seen Nov 7

Prices change often: ask the agent below to check today's price at every store.

Prices are checked against each store and labelled with when.

Check today's price at Arbor

Ask our agent about this product

It checks today's price at every store, compares the alternatives and answers in about a minute.

Our take on the Rockwool Foil Faced CurtainRock 40 24" x 48" 5 in

Rockwool CurtainRock 40 is a rigid stone wool board with reinforced foil facings, made for commercial curtain wall insulation. It combines thermal and acoustic control in one board, with an R-value of 4.3 per inch and a density of at least 4.0 lb/ft³. The 5-inch, 24" x 48" board is sold in packs covering 40 sq ft. It is mechanically fastened behind exterior wall systems, not a DIY retrofit product.

Best forCommercial curtain wall projectsContractors insulating exterior wall assembliesBuildings needing thermal and acoustic control togetherSpec jobs requiring noncombustible stone wool

Pros

Stone wool is chemically inert and passes fungi resistance testing
Reinforced foil facings add a vapor-retardant layer and protect the board
R-4.3 per inch gives about R-21.5 at 5 inches
Absorbs sound as well as blocking heat
Handles high service temperatures; melting point around 2150°F
Rigid board holds shape and cuts cleanly for tight wall cavities

Rockwool Foil Faced CurtainRock 40 24" x 48" 5 in prices at every store

ArborCheck price at Arbor

Rockwool Foil Faced CurtainRock 40 24" x 48" 5 in price history

Lowest price we've seen: $128.44 on Nov 7 at Arbor. Tracked across 1 store since Nov 7.

Specifications

Form: Board
Product Type: Rigid Foam Board
Insulation Type: Thermal, Acoustic
Insulated Plasterboard: No
Material Type: Stone wool
Facing: Reinforced foil facings
Material Composition

Questions and answers

What R-value does the 5-inch board give?: At 4.3 per inch, a 5-inch board is about R-21.5. Check the assembly's total R-value, since fasteners and framing reduce it.
Is CurtainRock 40 fire rated?: The stone wool is noncombustible with a melting point near 2150°F. The foil facings and any adhesives or sealants in the assembly have their own ratings, so confirm the full system.
Can I use it in a house?: It is designed for commercial curtain wall systems and exterior walls. It can work in residential exterior walls, but the foil facings and density make it overkill for most interior partitions.
How many boards come in a pack?: A pack covers 40 sq ft. With 24" x 48" boards at 8 sq ft each, that is 5 boards per pack.
How is it installed?: Boards are cut to fit and held with mechanical fasteners, then seams and penetrations are sealed with foil tape. Follow the curtain wall manufacturer's details for the assembly.