18mm STEICOflex 036 I-Joist Web Inserts - 1220mm x 575mm - Pallet of 240
18mm STEICOflex 036 I-Joist Web Inserts - 1220mm x 575mm - Pallet of 240
- Product Code: A1-7030
- Delivery Time: 2 - 4 weeks
- Brand: Steico
- Model: 1220mm x 575mm - 168m2
- Weight: 181.44kg
Our ratings on 13-05-2026:
4.8 out of 5
18mm STEICOflex 036 I-Joist Web Inserts - 1220mm x 575mm - Pallet of 240
Length: 1220mm
Width: 575mm
Thickness: 18mm
Single Coverage: 0.7m2
Pallet Coverage: 168m2
Density: 60kg/m3
Weight/m2: 1.08kg
Weight: 181.44kg
Thermal Conductivity: 0.036W/mK
R-Value: 0.5m2K/W
18mm STEICOflex 036 Inserts are designed to fill the "C" shaped void on either side of an I-joist web. By installing these inserts, you transform the irregular I-shape of the joist into a solid rectangular cross-section. This makes the subsequent installation of the main insulation layer much faster and more effective. STEICO flex 036 (Inserts for I-Joists)—also known as web insulation—is a specialized version of the flexible wood-fibre batt. While standard batts are thick for filling rafter voids, these inserts are thin, high-density strips designed specifically to fit into the recess of an I-joist web.
CHARCTERISTICS
- The primary purpose of these inserts is to flush out the joist. This ensures that the main insulation (whether batts or blown-in STEICOzell) can be installed tightly against a flat surface, eliminating the air pockets that usually occur in the web area.
- These inserts come in specific thicknesses tailored to match the flange width of the joist:
- 18 mm inserts are used for joists with a 45 mm flange.
- 25 mm inserts are used for joists with a 60 mm flange.
- Despite being thin, the material is robust and has enough spring to be friction-fitted into the web recess on-site, staying in place without the need for mechanical fixings in most cases.
- By filling the web void with wood fibre, you further reduce the already low thermal bridging of the I-joist, improving the overall U-value of the floor or roof.
- Filling the drum-like voids in the joists helps dampen sound transmission through floor and ceiling structures.
APPLICATION
- Prefabricated Elements: Often factory-fitted by timber frame manufacturers to create a solid feeling joist that is easier to insulate later.
- On-Site Upgrading: Installed by contractors before blowing in loose-fill insulation to ensure a perfect, void-free fill.
- Airtightness Detailing: Provides a flat surface at the ends of joists, making it much easier to tape membranes around the structural members.
CERTIFICATIONS
STEICO_Flex_Technical_Data_Sheet.pdf
Brand: Steico
Model: 1190mm x 575mm - 16.32m2
Delivery Time: 2 - 4 weeks
180mm STEICOflex 036 is a flexible, high‑performance wood‑fibre insulation slab designed for exceptional thermal comfort, acoustic absorption and healthy building performance. Made from sustainably sourced wood and certified to rigorous European standards, it offers one of the best thermal conductiv..
Brand: Steico
Model: 1200mm x 400mm - 4.8m2
Delivery Time: 2 - 4 weeks
220mm STEICO Protect L Dry is a lightweight, rigid wood-fibre insulation board designed specifically for ETICS (External Thermal Insulation Composite System) applications. It is engineered to be bonded directly to flat, solid surfaces such as masonry, brickwork, or Cross Laminated Timber (CLT), prov..
Brand: Steico
Model: 1350mm x 600mm - 22.68m2
Delivery Time: 2 - 4 weeks
80mm STEICOtherm Dry is a multi-purpose, rigid wood-fibre insulation slab. Because of its manufacturing process, it is significantly lighter than the "Wet" version, making it the preferred choice for large-scale roof and wall applications where reducing the structural load is key. the STEICOtherm Dr..
Brand: Steico
Model: 1200mm x 400mm - 5.76m2
Delivery Time: 2 - 4 weeks
180mm STEICO Protect L Dry is a lightweight, rigid wood-fibre insulation board designed specifically for ETICS (External Thermal Insulation Composite System) applications. It is engineered to be bonded directly to flat, solid surfaces such as masonry, brickwork, or Cross Laminated Timber (CLT), prov..
Brand: Steico
Model: 1880mm x 600mm - 11.30m2
Delivery Time: 2 - 4 weeks
200mm STEICO Special Dry is a multi-purpose, rigid wood-fibre insulation board manufactured using the modern Dry Process. It is designed to be installed on top of rafters (sarking) or on the outside of timber frame studs (sheathing). Because it is produced in a dry process, it can be manufactur..
Brand: Steico
Model: 150mm x 25m roll - 75/75 split
Delivery Time: 2 - 4 days
STEICOmulti Tape F is a premium, single-sided adhesive tape designed for the permanent, airtight, and weather-tight sealing of junctions. Unlike standard paper tapes, it features a specialised UV-stabilised film reinforced with a polyester lattice, making it the heavy-duty choice for both inter..